GLDD / Great Lakes Dredge & Dock Corporation - SEC फाइलिंग, वार्षिक रिपोर्ट, प्रॉक्सी स्टेटमेंट

ग्रेट लेक्स ड्रेज एंड डॉक कॉर्पोरेशन
US ˙ NasdaqGS ˙ US3906071093

मूलभूत आँकड़े
LEI 549300H65E3MZ1CX0P05
CIK 1372020
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Great Lakes Dredge & Dock Corporation
SEC Filings (Chronological Order)
यह पृष्ठ SEC फाइलिंग की एक पूरी, कालानुक्रमिक सूची प्रदान करता है, ओनरशिप फाइलिंग को छोड़कर, जो हम अन्यत्र प्रदान करते हैं।
August 5, 2025 EX-99.1

Great Lakes Reports Second Quarter 2025 Results Second quarter net income of $9.7 million Second quarter Adjusted EBITDA of $28.0 million Dredging backlog of $1 billion at June 30, 2025

EXHIBIT 99.1 Great Lakes Reports Second Quarter 2025 Results Second quarter net income of $9.7 million Second quarter Adjusted EBITDA of $28.0 million Dredging backlog of $1 billion at June 30, 2025 HOUSTON, Aug. 05, 2025 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (“Great Lakes” or the “Company”) (Nasdaq: GLDD), the largest provider of dredging services in the United States, today re

August 5, 2025 EX-10.1

Amendment No. 2 to Second Amended and Restated Revolving Credit and Security Agreement, dated May 2, 2025. *

AMENDMENT NO. 2 TO SECOND AMENDED AND RESTATED REVOLVING CREDIT AND SECURITY AGREEMENT This AMENDMENT NO. 2 TO SECOND AMENDED AND RESTATED REVOLVING CREDIT AND SECURITY AGREEMENT ("Amendment") is dated as of May 2, 2025, and is entered into by and among GREAT LAKES DREDGE & DOCK CORPORATION, a Delaware corporation ("GLDD"), GREAT LAKES DREDGE & DOCK COMPANY, LLC, a Delaware limited liability compa

August 5, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 5, 2025 Great Lakes Dredge

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 5, 2025 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporation

August 5, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dredge &

May 12, 2025 EX-10.1

Great Lakes Dredge & Dock Corporation 2021 Long-Term Incentive Plan, as amended.

EXHIBIT 10.1 GREAT LAKES DREDGE & DOCK CORPORATION 2021 LONG-TERM INCENTIVE PLAN, AS AMENDED I. INTRODUCTION 1.1 Purposes. The purposes of the Great Lakes Dredge & Dock Corporation 2021 Long Term Incentive Plan (this “Plan”) are (i) to align the interests of the Corporation’s stockholders and the recipients of awards under this Plan by increasing the proprietary interest of such recipients in the

May 12, 2025 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 8, 2025 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 (Commission File Number) 20-5336063 (State or other jurisdi

May 8, 2025 EX-FILING FEES

Calculation of Registration Fee

Calculation of Filing Fee Table FORM S-8 (Form Type) Great Lakes Dredge & Dock Corporation (Exact Name of Registrant as Specified in its Charter) Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered (1) Proposed Maximum Offering Price Per Unit (2) Maximum Aggregate Offering Price (2) Fee Rate Amount of Registration Fee (2) Equity (3) Common Stock, par value $0.

May 8, 2025 S-8

As filed with the Securities and Exchange Commission on May 8, 2025

As filed with the Securities and Exchange Commission on May 8, 2025 Registration No.

May 8, 2025 S-8

As filed with the Securities and Exchange Commission on May 8, 2025

As filed with the Securities and Exchange Commission on May 8, 2025 Registration No.

May 8, 2025 EX-FILING FEES

Calculation of Registration Fee

Calculation of Filing Fee Table FORM S-8 (Form Type) Great Lakes Dredge & Dock Corporation (Exact Name of Registrant as Specified in its Charter) Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered (1) Proposed Maximum Offering Price Per Unit (2) Maximum Aggregate Offering Price (2) Fee Rate Amount of Registration Fee (2) Equity (3) Common Stock, par value $0.

May 6, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 6, 2025 Great Lakes Dredge &

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 6, 2025 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporation) (

May 6, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dredge &

May 6, 2025 EX-99.1

Great Lakes Reports First Quarter 2025 Results First quarter net income of $33.4 million First quarter Adjusted EBITDA of $60.1 million Dredging backlog of $1 billion at March 31, 2025

EXHIBIT 99.1 Great Lakes Reports First Quarter 2025 Results First quarter net income of $33.4 million First quarter Adjusted EBITDA of $60.1 million Dredging backlog of $1 billion at March 31, 2025 HOUSTON, May 06, 2025 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (“Great Lakes” or the “Company”) (Nasdaq: GLDD), the largest provider of dredging services in the United States, today repo

March 26, 2025 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Defin

March 26, 2025 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

Table of Contents \ UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

March 14, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 12, 2025 Great Lakes Dredge

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 12, 2025 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 (Commission File Number) 20-5336063 (State or other juri

March 14, 2025 EX-99.1

GREAT LAKES ANNOUNCES $50 MILLION SHARE REPURCHASE PROGRAM

EXHIBIT 99.1 News from Great Lakes Dredge & Dock Corporation For further information contact: Eric M. Birge Vice President of Investor Relations [email protected] 313-220-3053 GREAT LAKES ANNOUNCES $50 MILLION SHARE REPURCHASE PROGRAM HOUSTON, TX., March 14, 2025 (GLOBE NEWSWIRE) – Great Lakes Dredge & Dock Corporation (“Great Lakes” or the “Company”) (Nasdaq: GLDD), the largest provider of dredgin

March 3, 2025 8-K/A

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A (Amendment No. 1) CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 5, 2025 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 (Commission File Number) 20-5336063

February 21, 2025 EX-21

Subsidiaries of Great Lakes Dredge & Dock Corporation. *

Exhibit 21 SUBSIDIARIES OF THE REGISTRANT Name Jurisdiction of Incorporation Great Lakes Dredge & Dock Company, LLC Delaware Great Lakes U.

February 21, 2025 EX-4.1

including Exhibit 4.1 to the 2024 Annual Report.

Exhibit 4.1 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 Great Lakes Dredge & Dock Corporation (the “Corporation,” “we,” “us” or “our”) has one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”): our common stock. DESCRIPTION OF CAPITAL STOCK The following des

February 21, 2025 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dr

February 21, 2025 EX-19

Great Lakes Dredge & Dock Corporation Insider Trading Policy. *

Exhibit 19 Great Lakes Dredge & Dock Corporation Policy and Procedures Securities Trading and Disclosure of Confidential Information Applicable Company Segment: Corporate Policy (all divisions) Revision Frequency: Annually Revision Date: May 9, 2024 Page: Page 1 of 12 Policy Owner: Chief Compliance Officer Approved By: Board of Directors Purpose: To explain the Company’s policies and procedures related to trading in Company securities and the disclosure of confidential information for key employees of Great Lakes Dredge & Dock Corporation and subsidiaries.

February 18, 2025 EX-99.1

Great Lakes Reports Fourth Quarter and Full Year 2024 Results Fourth quarter net income of $19.7 million Fourth quarter Adjusted EBITDA of $40.2 million Full year net income of $57.3 million Full year Adjusted EBITDA of $136.0 million Dredging backlo

EXHIBIT 99.1 Great Lakes Reports Fourth Quarter and Full Year 2024 Results Fourth quarter net income of $19.7 million Fourth quarter Adjusted EBITDA of $40.2 million Full year net income of $57.3 million Full year Adjusted EBITDA of $136.0 million Dredging backlog of $1.2 billion at December 31, 2024 HOUSTON, Feb. 18, 2025 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (“Great Lakes” or

February 18, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 18, 2025 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporat

January 8, 2025 EX-99.1

News from Great Lakes Dredge & Dock Corporation

News from Great Lakes Dredge & Dock Corporation For further information contact: Tina Baginskis Director, Investor Relations 630-574-3024 Great Lakes Announces Election of New Director HOUSTON, January 8, 2025 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation ("Great Lakes" or the “Company”) (NASDAQ: GLDD), the largest provider of dredging services in the United States, announced that Dana Armstrong was elected to its Board of Directors.

January 8, 2025 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 5, 2025 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 (Commission File Number) 20-5336063 (State or other jur

November 12, 2024 8-K

Amendment to Registrant's Code of Ethics, or Waiver of a Provision of the Code of Ethics

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 7, 2024 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 (Commission File Number) 20-5336063 (State or other ju

November 5, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 5, 2024 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporati

November 5, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dred

November 5, 2024 EX-99.1

Great Lakes Reports Third Quarter 2024 Results Third quarter net income of $8.9 million Third quarter adjusted EBITDA of $27.0 million Record dredging backlog of $1.21 billion at September 30, 2024

EXHIBIT 99.1 Great Lakes Reports Third Quarter 2024 Results Third quarter net income of $8.9 million Third quarter adjusted EBITDA of $27.0 million Record dredging backlog of $1.21 billion at September 30, 2024 HOUSTON, Nov. 05, 2024 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (“Great Lakes” or the “Company”) (Nasdaq: GLDD), the largest provider of dredging services in the United Stat

August 6, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dredge &

August 6, 2024 EX-99.1

Great Lakes Reports Second Quarter 2024 Results Second quarter net income of $7.7 million Second quarter adjusted EBITDA of $25.8 million Dredging backlog of $807.9 million at June 30, 2024

EXHIBIT 99.1 Great Lakes Reports Second Quarter 2024 Results Second quarter net income of $7.7 million Second quarter adjusted EBITDA of $25.8 million Dredging backlog of $807.9 million at June 30, 2024 HOUSTON, Aug. 06, 2024 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (“Great Lakes” or the “Company”) (Nasdaq: GLDD), the largest provider of dredging services in the United States, toda

August 6, 2024 EX-3.1

Second Amended and Restated Certificate of Incorporation of Great Lakes Dredge & Dock Corporation, effective May 9, 2024. *

SECOND AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF GREAT LAKES DREDGE & DOCK CORPORATION a Delaware corporation Great Lakes Dredge & Dock Corporation (the “Corporation”), a corporation organized and existing under the DGCL (as defined below), does hereby certify as follows: 1.

August 6, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 6, 2024 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporation

May 14, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 13, 2024 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 (Commission File Number) 20-5336063 (State or other jurisd

May 13, 2024 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 9, 2024 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 (Commission File Number) 20-5336063 (State or other jurisdi

May 7, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dredge &

May 7, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 7, 2024 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporation) (

May 7, 2024 EX-99.1

Great Lakes Reports First Quarter 2024 Results First quarter net income of $21.0 million First quarter adjusted EBITDA of $42.9 million Dredging backlog of $879.4 million at March 31, 2024

EXHIBIT 99.1 Great Lakes Reports First Quarter 2024 Results First quarter net income of $21.0 million First quarter adjusted EBITDA of $42.9 million Dredging backlog of $879.4 million at March 31, 2024 HOUSTON, May 07, 2024 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (“Great Lakes” or the “Company”) (Nasdaq: GLDD), the largest provider of dredging services in the United States, today

April 25, 2024 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 24, 2024 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 (Commission File Number) 20-5336063 (State or other juri

April 25, 2024 EX-10.2

Amendment No. 1 to Second Amended and Restated Revolving Credit and Security Agreement, dated April 24, 2024 (Incorporated by reference to Great Lakes Dredge & Dock Corporation’s Current Report on Form 8-K filed with the Commission on April 25, 2024). ***

Exhibit 10.2 AMENDMENT NO. 1 TO SECOND AMENDED AND RESTATED REVOLVING CREDIT AND SECURITY AGREEMENT This AMENDMENT NO. 1 TO SECOND AMENDED AND RESTATED REVOLVING CREDIT AND SECURITY AGREEMENT ("Amendment") is dated as of April 24, 2024, and is entered into by and among GREAT LAKES DREDGE & DOCK CORPORATION, a Delaware corporation ("GLDD"), GREAT LAKES DREDGE & DOCK COMPANY, LLC, a Delaware limited

April 25, 2024 EX-10.1

Second Lien Credit Agreement, dated April 24, 2024 (Incorporated by reference to Great Lakes Dredge & Dock Corporation’s Current Report on Form 8-K filed with the Commission on April 25, 2024). ***

IF "" = "2" "Error! Unknown document property name." "" Exhibit 10.1 SECOND LIEN CREDIT AGREEMENT dated as of April 24, 2024 by and among GREAT LAKES DREDGE & DOCK CORPORATION as Borrower, GREAT LAKES DREDGE & DOCK COMPANY, LLC NASDI HOLDINGS, LLC GREAT LAKES ENVIRONMENTAL & INFRASTRUCTURE SOLUTIONS, LLC GREAT LAKES U.S. FLEET MANAGEMENT, LLC and DREWS SERVICES LLC as Guarantors, VARIOUS LENDERS F

March 27, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Defin

March 27, 2024 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14

March 14, 2024 PRE 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☒ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14

February 16, 2024 EX-97

Great Lakes Dredge & Dock Corporation Statement of Policy Regarding Incentive Compensation Recoupment. *

Exhibit 97 GREAT LAKES DREDGE & DOCK CORPORATION STATEMENT OF POLICY REGARDING INCENTIVE COMPENSATION RECOUPMENT Overview.

February 16, 2024 EX-10.4

Employment Agreement between Great Lakes Dredge & Dock Corporation and Eleni Beyko, dated as of January 8, 2021. * †

Exhibit 10.4 EMPLOYMENT AGREEMENT This EMPLOYMENT AGREEMENT (the “Agreement”) is made as of this 8th day of January, 2021 (the “Agreement Date”), by and between Great Lakes Dredge & Dock Corporation (the “Corporation”), with and on behalf of its wholly-owned subsidiaries (together, the “Company”), and Eleni Beyko (“Executive”). ARTICLE I EMPLOYMENT SERVICES 1.1 Term of Employment. Executive’s empl

February 16, 2024 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dr

February 16, 2024 EX-21.1

Subsidiaries of Great Lakes Dredge & Dock Corporation. *

Exhibit 21.1 SUBSIDIARIES OF THE REGISTRANT Name Jurisdiction of Incorporation Great Lakes Dredge & Dock Company, LLC Delaware Great Lakes U.S. Fleet Management, LLC Delaware Great Lakes Environmental & Infrastructure Solutions, LLC Delaware Great Lakes Dredge & Dock do Brasil Ltda. Brazil Great Lakes Dredge & Dock (Bahamas) Ltd. Bahamas Great Lakes Dredge & Dock (UK) Limited United Kingdom NASDI

February 14, 2024 SC 13G/A

GLDD / Great Lakes Dredge & Dock Corporation / PRUDENTIAL FINANCIAL INC Passive Investment

13G HTML File DOCUMENT TYPE SC 13G/A TEXT SECURITIES AND EXCHANGE COMMISSION Washington, D.

February 14, 2024 SC 13G/A

GLDD / Great Lakes Dredge & Dock Corporation / ALLIANCEBERNSTEIN L.P. - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1 )* Great Lakes Dredge & Dock Corp (Name of Issuer) Common Stock (Title of Class of Securities) 390607109 (CUSIP Number) December 31, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to wh

February 14, 2024 EX-99.1

Great Lakes Reports Fourth Quarter and Full Year 2023 Results Fourth quarter net income of $21.6 million Fourth quarter adjusted EBITDA of $40.8 million Full year net income of $13.9 million Full year adjusted EBITDA of $73.0 million Record dredging

EXHIBIT 99.1 Great Lakes Reports Fourth Quarter and Full Year 2023 Results Fourth quarter net income of $21.6 million Fourth quarter adjusted EBITDA of $40.8 million Full year net income of $13.9 million Full year adjusted EBITDA of $73.0 million Record dredging backlog of $1.04 billion at December 31, 2023 HOUSTON, Feb. 14, 2024 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (“Great Lak

February 14, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 14, 2024 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporat

February 13, 2024 SC 13G/A

GLDD / Great Lakes Dredge & Dock Corporation / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv01046-greatlakesdredgedock.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 1)* Name of issuer: Great Lakes Dredge & Dock Corp Title of Class of Securities: Common Stock CUSIP Number: 390607109 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate

February 9, 2024 SC 13G/A

GLDD / Great Lakes Dredge & Dock Corporation / DIMENSIONAL FUND ADVISORS LP - SEC SCHEDULE 13G Passive Investment

SC 13G/A 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 12 )* Great Lakes Dredge & Dock Corp (Name of Issuer) Common Stock (Title of Class of Securities) 390607109 (CUSIP Number) December 29, 2023 (Date of Event Which Requires Filing of this Statement) Check the approp

November 22, 2023 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 21, 2023 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 (Commission File Number) 20-5336063 (State or other j

November 7, 2023 EX-99.1

Great Lakes Reports Third Quarter 2023 Results Third quarter net loss of $6.2 million Third quarter adjusted EBITDA of $5.3 million Dredging backlog of $1.03 billion at September 30, 2023

EXHIBIT 99.1 Great Lakes Reports Third Quarter 2023 Results Third quarter net loss of $6.2 million Third quarter adjusted EBITDA of $5.3 million Dredging backlog of $1.03 billion at September 30, 2023 HOUSTON, Nov. 07, 2023 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (“Great Lakes” or the “Company”) (Nasdaq: GLDD), the largest provider of dredging services in the United States, today

November 7, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 7, 2023 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporati

November 7, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dred

October 31, 2023 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 26, 2023 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 (Commission File Number) 20-5336063 (State or other ju

August 17, 2023 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 15, 2023 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 (Commission File Number) 20-5336063 (State or other jur

August 1, 2023 EX-99.1

Great Lakes Reports Second Quarter 2023 Results Second quarter net income of $1.7 million Second quarter adjusted EBITDA of $16.6 million Dredging backlog of $434.6 million at June 30, 2023

EXHIBIT 99.1 Great Lakes Reports Second Quarter 2023 Results Second quarter net income of $1.7 million Second quarter adjusted EBITDA of $16.6 million Dredging backlog of $434.6 million at June 30, 2023 HOUSTON, Aug. 01, 2023 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (“Great Lakes” or the “Company”) (Nasdaq: GLDD), the largest provider of dredging services in the United States, toda

August 1, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dredge &

August 1, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 1, 2023 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporation

July 12, 2023 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 7, 2023 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 (Commission File Number) 20-5336063 (State or other jurisd

May 9, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 3, 2023 Great Lakes Dredge &

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 3, 2023 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 (Commission File Number) 20-5336063 (State or other jurisdi

May 2, 2023 EX-10

Consulting Agreement between Great Lakes Dredge & Dock Company, LLC and David E. Simonelli, dated as of December 1, 2022. *†

Exhibit 10.1 LP 21679688.4 \ 41803-111193 CONSULTING AGREEMENT This CONSULTING AGREEMENT (“Agreement”) is made and entered into as of the 1st day of December, 2022 (the “Effective Date”), by and between Great Lakes Dredge & Dock Company, LLC, the (“Company”), and David E. Simonelli, an individual (“Consultant”). SECTION 1. Engagement. During the Consulting Term (as defined below), the Company enga

May 2, 2023 EX-99.1

Great Lakes Reports First Quarter 2023 Results First quarter net loss of $3.2 million First quarter adjusted EBITDA of $10.2 million Dredging backlog of $327.1 million at March 31, 2023

EXHIBIT 99.1 Great Lakes Reports First Quarter 2023 Results First quarter net loss of $3.2 million First quarter adjusted EBITDA of $10.2 million Dredging backlog of $327.1 million at March 31, 2023 HOUSTON, May 02, 2023 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (“Great Lakes” or the “Company”) (Nasdaq: GLDD), the largest provider of dredging services in the United States, today rep

May 2, 2023 10-Q

F UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

F UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dredge

May 2, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 2, 2023 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporation) (

March 24, 2023 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14

March 24, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Defin

February 17, 2023 EX-21

Subsidiaries of Great Lakes Dredge & Dock Corporation. *

Exhibit 21.1 SUBSIDIARIES OF THE REGISTRANT Name Jurisdiction of Incorporation Great Lakes Dredge & Dock Company, LLC Delaware Great Lakes U.S. Fleet Management, LLC Delaware Great Lakes Environmental & Infrastructure Solutions, LLC Delaware Great Lakes Dredge & Dock do Brasil Ltda. Brazil Great Lakes Dredge & Dock (Bahamas) Ltd. Bahamas NASDI Holdings, LLC Delaware Terra Contracting Services, LLC

February 17, 2023 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dr

February 15, 2023 EX-99.1

Great Lakes Reports Fourth Quarter and Full Year 2022 Results Fourth quarter net loss of $31.2 million Fourth quarter negative adjusted EBITDA of $24.2 million Full year net loss of $34.1 million Full year adjusted EBITDA of $17.0 million Net loss an

EXHIBIT 99.1 Great Lakes Reports Fourth Quarter and Full Year 2022 Results Fourth quarter net loss of $31.2 million Fourth quarter negative adjusted EBITDA of $24.2 million Full year net loss of $34.1 million Full year adjusted EBITDA of $17.0 million Net loss and adjusted EBITDA include $8.1 million charge for retirement of the Terrapin Island hopper dredge in Q4 Dredging backlog of $377.1 millio

February 15, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 15, 2023 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporat

February 14, 2023 SC 13G

GLDD / Great Lakes Dredge & Dock Corporation / ALLIANCEBERNSTEIN L.P. - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Great Lakes Dredge & Dock Corp (Name of Issuer) Common Stock (Title of Class of Securities) 390607109 (CUSIP Number) December 31, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to whic

February 13, 2023 SC 13G/A

GLDD / Great Lakes Dredge & Dock Corporation / PRUDENTIAL FINANCIAL INC Passive Investment

SC 13G/A 1 greatlake.htm DOCUMENT TYPE SC 13G/A TEXT SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 Amendment # 15 Name of Issuer: GREAT LAKES DREDGE AND DOCK CORP Title of Class of Securities: Common Stock CUSIP Number: 390607109 1) NAME AND I.R.S. IDENTIFICATION NO. OF REPORTING PERSON Prudential Financial, Inc. 22-3703799 2.) MEM

February 10, 2023 SC 13G/A

GLDD / Great Lakes Dredge & Dock Corporation / DIMENSIONAL FUND ADVISORS LP - SEC SCHEDULE 13G Passive Investment

SC 13G/A 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 11 )* Great Lakes Dredge & Dock Corp (Name of Issuer) Common Stock (Title of Class of Securities) 390607109 (CUSIP Number) December 30, 2022 (Date of Event Which Requires Filing of this Statement) Check the approp

February 9, 2023 SC 13G

GLDD / Great Lakes Dredge & Dock Corporation / VANGUARD GROUP INC - SCHEDULE 13G Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 Name of issuer: Great Lakes Dredge & Dock Corp. Title of Class of Securities: Common Stock CUSIP Number: 390607109 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ☒ Rule 13

January 31, 2023 SC 13G/A

GLDD / Great Lakes Dredge & Dock Corporation / FRANKLIN MUTUAL ADVISERS LLC Passive Investment

SC 13G/A 1 grea22a1.htm CUSIP NO. 390607109 13G Page 1 of 7 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* Great Lakes Dredge & Dock Corporation (Name of Issuer) Common Stock (Par Value $0.0001) (Title of Class of Securities) 390607109 (CUSIP Number) December 31, 2022 (Date of Event Which Requires Fi

January 19, 2023 EX-3.1

Second Amended and Restated Bylaws of Great Lakes Dredge & Dock Corporation, dated as of January 12, 2023. (Incorporated by reference to Great Lakes Dredge & Dock Corporation’s Current Report on Form 8-K filed with the Commission on January 19, 2023).

EXHIBIT 3.1 SECOND AMENDED AND RESTATED BYLAWS OF GREAT LAKES DREDGE & DOCK CORPORATION A DELAWARE CORPORATION (EFFECTIVE AS OF JANUARY 12, 2023) Article I OFFICES Section 1. Registered Office. The registered office of the corporation in the State of Delaware shall be located at 1209 Orange Street, in the city of Wilmington, Delaware, County of New Castle. The name of the corporation’s registered

January 19, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 12, 2023 Great Lakes Dred

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 12, 2023 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 (Commission File Number) 20-5336063 (State or other ju

November 1, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dred

November 1, 2022 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 1, 2022 Great Lakes Dred

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 1, 2022 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporati

November 1, 2022 EX-99.1

Great Lakes Reports Third Quarter Results Third quarter net loss of $9.9 million Third quarter adjusted EBITDA of $1.3 million Dredging Backlog of $452.6 million at September 30, 2022

EXHIBIT 99.1 Great Lakes Reports Third Quarter Results Third quarter net loss of $9.9 million Third quarter adjusted EBITDA of $1.3 million Dredging Backlog of $452.6 million at September 30, 2022 HOUSTON, Nov. 01, 2022 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (“Great Lakes” or the “Company”) (Nasdaq: GLDD), the largest provider of dredging services in the United States, today repo

August 2, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 2, 2022 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporation

August 2, 2022 EX-99.1

Great Lakes Reports Second Quarter Results Second quarter net loss of $4.0 million Second quarter adjusted EBITDA of $10.2 million Backlog of $373.8 million at June 30, 2022

EXHIBIT 99.1 Great Lakes Reports Second Quarter Results Second quarter net loss of $4.0 million Second quarter adjusted EBITDA of $10.2 million Backlog of $373.8 million at June 30, 2022 HOUSTON, Aug. 02, 2022 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (?Great Lakes? or the ?Company?) (Nasdaq: GLDD), the largest provider of dredging services in the United States, today reported finan

August 2, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dredge &

August 1, 2022 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 29, 2022 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 20-5336063 (State or other jurisdiction of incorporation) 001-33225

August 1, 2022 EX-10.1

Second Amended and Restated Revolving Credit and Security Agreement dated as of July 29, 2022 by and among Great Lakes Dredge & Dock Corporation, as Borrower, each other Credit Party party hereto from time to time, the financial institutions which are now or which hereafter become a party hereto as lenders, PNC Bank, National Association, as Agent (the “Agent”), PNC Capital Markets, CIBC Bank USA, Bank of America, N.A. and Truist Securities, Inc., as Joint Lead Arrangers and Joint Bookrunners, CIBC Bank USA and Truist Bank as Co-Syndication Agents, Bank of America, N.A., as Documentation Agent and PNC Bank National Association, as Green Loan Coordinator (Incorporated by reference to Great Lakes Dredge & Dock Corporation’s Current Report on Form 8-K filed with the Commission on August 1, 2022)

EXHIBIT 10.1 SECOND AMENDED AND RESTATED REVOLVING CREDIT AND SECURITY AGREEMENT PNC CAPITAL MARKETS, CIBC BANK USA, BANK OF AMERICA, N.A., and TRUIST SECURITIES, INC. (AS JOINT LEAD ARRANGERS AND JOINT BOOKRUNNERS) PNC BANK, NATIONAL ASSOCIATION (AS LENDER AND AS AGENT) CIBC BANK USA, and TRUIST BANK (AS CO-SYNDICATION AGENTS) BANK OF AMERICA, N.A. (AS DOCUMENTATION AGENT) PNC BANK, NATIONAL ASSO

July 29, 2022 EX-99.1

News from Great Lakes Dredge & Dock Corporation

EXHIBIT 99.1 News from Great Lakes Dredge & Dock Corporation For further information contact: Tina Baginskis Director, Investor Relations 630-574-3024 GREAT LAKES DREDGE & DOCK CORPORATION ANNOUNCES NEW APPOINTMENTS HOUSTON, July 26, 2022 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (?Great Lakes? or the ?Company?) (NASDAQ:GLDD), the largest provider of dredging services in the United

July 29, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 26, 2022 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 20-5336063 (State or other jurisdiction of incorporation) 001-33225

June 23, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 16, 2022 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 20-5336063 (State or other jurisdiction of incorporation) 001-33225

June 23, 2022 EX-99.1

GREAT LAKES DREDGE & DOCK CORPORATION ANNOUNCES THE RETIREMENT OF CHIEF OPERATING OFFICER, DAVID E. SIMONELLI

EXHIBIT 99.1 News from Great Lakes Dredge & Dock Corporation For further information contact: Tina Baginskis Director, Investor Relations 630-574-3024 GREAT LAKES DREDGE & DOCK CORPORATION ANNOUNCES THE RETIREMENT OF CHIEF OPERATING OFFICER, DAVID E. SIMONELLI HOUSTON, June 22, 2022 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (?Great Lakes? or the ?Company?) (NASDAQ:GLDD), the largest

May 11, 2022 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 4, 2022 GREAT LAKES DREDGE & DOCK CORPORATION (Exact name of registrant as specified in its charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporation) (

May 3, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dredge &

May 3, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 3, 2022 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporation) (

May 3, 2022 EX-99.1

Great Lakes Reports First Quarter Results First quarter net income of $11.1 million First quarter adjusted EBITDA of $29.7 million Backlog of $473.5 million at March 31, 2022

EXHIBIT 99.1 Great Lakes Reports First Quarter Results First quarter net income of $11.1 million First quarter adjusted EBITDA of $29.7 million Backlog of $473.5 million at March 31, 2022 HOUSTON, May 03, 2022 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (?Great Lakes? or the ?Company?) (Nasdaq:GLDD), the largest provider of dredging services in the United States, today reported financ

March 25, 2022 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.  )

TABLE OF CONTENTS UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ?) Filed by the Registrant ? Filed by a Party other than the Registrant ?? Check the appropriate box: ?? Preliminary Proxy Statement ?? Confidential, for Use of the Commission Only (as permitted by Rul

March 25, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defin

February 23, 2022 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dr

February 23, 2022 EX-10.10

Employment Agreement between Great Lakes Dredge & Dock Corporation and Vivienne Schiffer, dated as of December 7, 2020. (Incorporated by reference to Great Lakes Dredge & Dock Corporation’s Annual Report on Form 10-K filed with the Commission on February 23, 2022). †

EXHIBIT 10.10 EMPLOYMENT AGREEMENT This EMPLOYMENT AGREEMENT (the ?Agreement?) is made as of this day of February 2021 (the ?Agreement Date?), to be effective the 7th day of December, 2020 (the ?Start Date?), by and between Great Lakes Dredge & Dock Corporation (the ?Corporation?), with and on behalf of its wholly owned subsidiaries (together, the ?Company?), and Vivienne Schiffer (?Executive?). A

February 23, 2022 EX-10.29

Vessel Construction Agreement, dated November 15, 2021 by and between Philly Shipyard Inc., and Great Lakes Dredge & Dock Company, LLC. (Incorporated by reference to Great Lakes Dredge & Dock Corporation’s Annual Report on Form 10-K filed with the Commission on February 23, 2022). (1)

Confidential Commercial InformationExecution Version EXHIBIT 10.29 CERTAIN IDENTIFIED INFORMATION HAS BEEN EXCLUDED FROM THE EXHIBIT BECAUSE IT IS BOTH NOT MATERIAL AND IS THE TYPE OF INFORMATION THAT THE COMPANY TREATS AS PRIVATE OR CONFIDENTIAL. [***] INDICATES THAT INFORMATION HAS BEEN REDACTED. VESSEL CONSTRUCTION AGREEMENT BY AND BETWEEN PHILLY SHIPYARD, INC. (Builder) AND GREAT LAKES DREDGE

February 23, 2022 EX-21.1

Subsidiaries of Great Lakes Dredge & Dock Corporation. *

Exhibit 21.1 SUBSIDIARIES OF THE REGISTRANT Name Jurisdiction of Incorporation Great Lakes Dredge & Dock Company, LLC Delaware Great Lakes U.S. Fleet Management, LLC Delaware Great Lakes Environmental & Infrastructure Solutions, LLC Delaware Great Lakes Dredge & Dock do Brasil Ltda. Brazil Great Lakes Dredge & Dock (Bahamas) Ltd. Bahamas NASDI Holdings, LLC Delaware Terra Contracting Services, LLC

February 16, 2022 EX-99.1

Great Lakes Reports Fourth Quarter and Full Year 2021 Results Fourth quarter net income of $24.7 million Fourth quarter adjusted EBITDA of $48.2 million Full year net income of $49.4 million Full year adjusted EBITDA of $127.4 million Backlog of $551

EXHIBIT 99.1 Great Lakes Reports Fourth Quarter and Full Year 2021 Results Fourth quarter net income of $24.7 million Fourth quarter adjusted EBITDA of $48.2 million Full year net income of $49.4 million Full year adjusted EBITDA of $127.4 million Backlog of $551.6 million at December 31, 2021 HOUSTON, Feb. 16, 2022 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (?Great Lakes? or the ?Co

February 16, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 16, 2022 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporat

February 14, 2022 SC 13G/A

GLDD / Great Lakes Dredge & Dock Corporation / ASHFORD CAPITAL MANAGEMENT INC - ASHFORD CAPITAL MANAGEMENT, INC. -- SCH 13GA(#1E) Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 1)* Great Lakes Dredge & Dock Corporation (Name of Issuer) Common Stock, $0.0001 Par Value Per Share (Title of Class of Securities) 390607109 (CUSIP Number) December 31, 2021 (Date of Event Which Requires Filing of This Statement) Check the appropriate box

February 14, 2022 SC 13G/A

GLDD / Great Lakes Dredge & Dock Corporation / PRUDENTIAL FINANCIAL INC Passive Investment

DOCUMENT TYPE SC 13G/A TEXT SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 Amendment # 14 Name of Issuer: GREAT LAKES DREDGE AND DOCK CORP Title of Class of Securities: Common Stock CUSIP Number: 390607109 1) NAME AND I.R.S. IDENTIFICATION NO. OF REPORTING PERSON Prudential Financial, Inc. 22-3703799 2.) MEMBER OF A GROUP: (a) N/A (

February 11, 2022 SC 13G/A

GLDD / Great Lakes Dredge & Dock Corporation / Russell Investments Group, Ltd. - SC 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* Great Lakes Dredge & Dock Corporation (Name of Issuer) Common Stock (Title of Class of Securities) 390607109 (CUSIP Number) December 31, 2021 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant

February 10, 2022 SC 13G/A

GLDD / Great Lakes Dredge & Dock Corporation / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 2)* Name of issuer: Great Lakes Dredge & Dock Corp. Title of Class of Securities: Common Stock CUSIP Number: 390607109 Date of Event Which Requires Filing of this Statement: December 31, 2021 Check the appropriate box to designate the rule pursuant to which this Schedule

February 8, 2022 SC 13G/A

GLDD / Great Lakes Dredge & Dock Corporation / DIMENSIONAL FUND ADVISORS LP - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 10 )* Great Lakes Dredge & Dock Corp (Name of Issuer) Common Stock (Title of Class of Securities) 390607109 (CUSIP Number) December 31, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to w

February 1, 2022 SC 13G

GLDD / Great Lakes Dredge & Dock Corporation / FRANKLIN MUTUAL ADVISERS LLC Passive Investment

CUSIP NO. 390607109 13G Page 1 of 8 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Great Lakes Dredge & Dock Corporation (Name of Issuer) Common Stock (Par Value $0.0001) (Title of Class of Securities) 390607109 (CUSIP Number) December 31, 2021 (Date of Event Which Requires Filing of this Statement) C

January 28, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 25, 2022 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 20-5336063 (State or other jurisdiction of incorporation) 001-33

November 18, 2021 EX-99.1

Great Lakes Dredge & Dock Corporation Signs Contract with Philly Shipyard, Inc. to Build the First Jones-Act Compliant Subsea Rock Installation Vessel for U.S. Offshore Wind

EXHIBIT 99.1 News from Great Lakes Dredge & Dock Corporation For further information contact: Tina Baginskis Director, Investor Relations 630-574-3024 Great Lakes Dredge & Dock Corporation Signs Contract with Philly Shipyard, Inc. to Build the First Jones-Act Compliant Subsea Rock Installation Vessel for U.S. Offshore Wind ? Historic milestone for domestic offshore wind industry, will create hundr

November 18, 2021 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 15, 2021 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 20-5336063 (State or other jurisdiction of incorporation) 001-3

November 2, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dred

November 2, 2021 EX-99.1

Great Lakes Reports Third Quarter Results Third quarter net income of $13.8 million Third quarter adjusted EBITDA of $32.2 million Backlog of $598.5 million at September 30, 2021

EXHIBIT 99.1 Great Lakes Reports Third Quarter Results Third quarter net income of $13.8 million Third quarter adjusted EBITDA of $32.2 million Backlog of $598.5 million at September 30, 2021 HOUSTON, Nov. 02, 2021 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (?Great Lakes?) (Nasdaq:GLDD), the largest provider of dredging services in the United States, today reported financial results

November 2, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 2, 2021 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporati

November 2, 2021 EX-10.2

Separation Agreement, dated October 7, 2021, between Great Lakes Dredge & Dock Corporation and Mark W. Marinko. †*

Exhibit 10.2 SEPARATION AND GENERAL RELEASE AGREEMENT Caution: Read Carefully This Is A Release Of All Claims THIS SEPARATION AND GENERAL RELEASE AGREEMENT ("Agreement") is voluntarily entered into as of the date(s) set forth below by and between the undersigned individual employee, Mark W. Marinko (?Marinko?), and Great Lakes Dredge & Dock Corporation with and on behalf of its wholly owned subsid

October 4, 2021 EX-99.1

Great Lakes Dredge & Dock Corporation Appoints Scott Kornblau as Senior Vice President and Chief Financial Officer

EXHIBIT 99.1 News from Great Lakes Dredge & Dock Corporation For further information contact: Tina Baginskis Director, Investor Relations 630-574-3024 Great Lakes Dredge & Dock Corporation Appoints Scott Kornblau as Senior Vice President and Chief Financial Officer HOUSTON ? [Oct. 1, 2021] ? Great Lakes Dredge & Dock Co. (NASDAQ:GLDD), the nation?s largest provider of dredging servicers, has appoi

October 4, 2021 EX-10.1

Employment Agreement between Great Lakes Dredge & Dock Corporation and Scott Kornblau, dated as of September 29, 2021. (Incorporated by reference to Great Lakes Dredge & Dock Corporation’s Current Report on Form 8-K filed with the Commission on October 4 , 2021).†

EXHIBIT 10.1 EMPLOYMENT AGREEMENT This EMPLOYMENT AGREEMENT (the ?Agreement?) is made as of this 29th day of September, 2021 (the ?Agreement Date?), by and between Great Lakes Dredge & Dock Corporation (the ?Corporation?), with and on behalf of its wholly-owned subsidiaries (together, the ?Company?), and Scott L. Kornblau (?Executive?). ARTICLE I EMPLOYMENT SERVICES 1.1Term of Employment. Executiv

October 4, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 29, 2021 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 20-5336063 (State or other jurisdiction of incorporation) 001-

August 3, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 3, 2021 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporation

August 3, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dredge &

August 3, 2021 EX-99.1

Great Lakes Reports Second Quarter Results Second quarter net income of $2.1 million First half net income of $10.9 million Second quarter adjusted EBITDA of $20.2 million First half adjusted EBITDA $47.1 million

EXHIBIT 99.1 Great Lakes Reports Second Quarter Results Second quarter net income of $2.1 million First half net income of $10.9 million Second quarter adjusted EBITDA of $20.2 million First half adjusted EBITDA $47.1 million HOUSTON, Aug. 03, 2021 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (Nasdaq:GLDD), the largest provider of dredging services in the United States, today reported

August 2, 2021 EX-99.1

News from Great Lakes Dredge & Dock Corporation

EX-99.1 2 gldd-ex9916.htm EX-99.1 EXHIBIT 99.1 News from Great Lakes Dredge & Dock Corporation For further information contact: Tina Baginskis Director, Investor Relations 630-574-3024 Great Lakes Announces a New Appointment to the Board of Directors HOUSTON, TX, August 2, 2021 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation ("Company") (NASDAQ: GLDD), the largest provider of dredging ser

August 2, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 29, 2021 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 20-5336063 (State or other jurisdiction of incorporation) 001-33225

June 10, 2021 S-8 POS

As filed with the Securities and Exchange Commission on June 9, 2021

As filed with the Securities and Exchange Commission on June 9, 2021 Registration No.

June 10, 2021 S-8

As filed with the Securities and Exchange Commission on June 9, 2021

As filed with the Securities and Exchange Commission on June 9, 2021 Registration No.

May 25, 2021 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 25, 2021 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 20-5336063 (State or other jurisdiction of incorporation) 001-33225

May 25, 2021 EX-4.1

Indenture, dated May 25, 2021, among Great Lakes Dredge & Dock Corporation, as Issuer, the guarantors party thereto, and Wells Fargo Bank, National Association, as Trustee, relating to the 2029 Notes (incorporated by reference to Great Lakes Dredge & Dock Corporation’s Quarterly Report on Form 10-Q filed with the Commission on August 3, 2021).

Exhibit 4.1 Execution Version GREAT LAKES DREDGE & DOCK CORPORATION, as Issuer, and THE GUARANTORS PARTY HERETO, as Guarantors $325,000,000 5.25% Senior Notes due 2029 INDENTURE Dated as of May 25, 2021 Wells Fargo Bank, National Association, as Trustee TABLE OF CONTENTS Page Article 1. DEFINITIONS AND INCORPORATION BY REFERENCE1 Section 1.01. Definitions.1 Section 1.02. Other Definitions.26 Secti

May 18, 2021 EX-10.1

Purchase Agreement, dated May 12, 2021, by and among Great Lakes Dredge & Dock Corporation, certain subsidiary guarantors named therein and BofA Securities, Inc., as representative of the initial purchasers named therein.

EX-10.1 2 gldd-ex10133.htm EX-10.1 Exhibit 10.1 Execution Version Great Lakes Dredge & Dock Corporation $325,000,000 5.25% Senior Notes due 2029 PURCHASE AGREEMENT May 12, 2021 BOFA SECURITIES, INC. as Representative of the several Initial Purchasers named in Schedule 1 hereto One Bryant Park New York, New York 10036 Ladies and Gentlemen: Great Lakes Dredge & Dock Corporation, a Delaware corporati

May 18, 2021 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 12, 2021 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 20-5336063 (State or other jurisdiction of incorporation) 001-33225

May 12, 2021 EX-99.1

GREAT LAKES DREDGE & DOCK CORPORATION ANNOUNCES PRICING OF SENIOR NOTES Higher-Interest Senior Notes to be Redeemed with Net Proceeds

EX-99.1 2 gldd-ex99156.htm EX-99.1 Exhibit 99.1 News Release FOR IMMEDIATE RELEASE: May 12, 2021 GREAT LAKES DREDGE & DOCK CORPORATION ANNOUNCES PRICING OF SENIOR NOTES Higher-Interest Senior Notes to be Redeemed with Net Proceeds HOUSTON, May 12, 2021 - Great Lakes Dredge & Dock Corporation (NASDAQ: GLDD) (“Great Lakes” or the “Company”) announced today that it has agreed to sell $325 million agg

May 12, 2021 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 12, 2021 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 20-5336063 (State or other jurisdiction of incorporation) 001-33225

May 10, 2021 EX-99.1

GREAT LAKES DREDGE & DOCK CORPORATION ANNOUNCES PRIVATE OFFERING OF SENIOR NOTES

Exhibit 99.1 GREAT LAKES DREDGE & DOCK CORPORATION ANNOUNCES PRIVATE OFFERING OF SENIOR NOTES HOUSTON, May 10, 2021 (GLOBE NEWSWIRE) ? Great Lakes Dredge & Dock Corporation (NASDAQ: GLDD) (?Great Lakes? or the ?Company?) (NASDAQ: GLDD), announced today that, subject to market conditions, it plans to offer $325 million aggregate principal amount of fixed-rate, unsecured senior notes (the ?New Notes

May 10, 2021 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 10, 2021 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 20-5336063 (State or other jurisdiction of incorporation) 001-33225

May 7, 2021 EX-10.1

Great Lakes Dredge & Dock Corporation 2021 Long-Term Incentive Plan.

EX-10.1 2 gldd-ex1016.htm EX-10.1 Exhibit 10.1 GREAT LAKES DREDGE & DOCK CORPORATION 2021 LONG-TERM INCENTIVE PLAN I. INTRODUCTION 1.1Purposes. The purposes of the Great Lakes Dredge & Dock Corporation 2021 Long‑Term Incentive Plan (this “Plan”) are (i) to align the interests of the Corporation’s stockholders and the recipients of awards under this Plan by increasing the proprietary interest of su

May 7, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 5, 2021 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 20-5336063 (State or other jurisdiction of incorporation) 001-33225 (

May 4, 2021 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dredge &

May 4, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 4, 2021 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporation) (

May 4, 2021 EX-99.1

Great Lakes Reports First Quarter Results First quarter net income of $8.8 million First quarter adjusted EBITDA of $26.8 million First quarter awards of $90.3 million resulting in 42% bid market share

EXHIBIT 99.1 Great Lakes Reports First Quarter Results First quarter net income of $8.8 million First quarter adjusted EBITDA of $26.8 million First quarter awards of $90.3 million resulting in 42% bid market share HOUSTON, May 04, 2021 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (Nasdaq:GLDD), the largest provider of dredging services in the United States, today reported financial re

May 4, 2021 EX-10.1

EMPLOYMENT AGREEMENT

Exhibit 10.1 EMPLOYMENT AGREEMENT This EMPLOYMENT AGREEMENT (the ?Agreement?) is made as of this 1st day of October, 2020 (the ?Agreement Date?), by and between Great Lakes Dredge & Dock Corporation (the ?Corporation?), with and on behalf of its wholly-owned subsidiaries (together, the ?Company?), and James Tastard (?Executive?). ARTICLE I EMPLOYMENT SERVICES 1.1Term of Employment. Executive?s emp

May 4, 2021 EX-10.2

MUTUAL AGREEMENT ON TRANSITION AND GENERAL RELEASE Caution: Read Carefully This Is A Release Of All Claims

EX-10.2 3 gldd-ex10284.htm EX-10.2 Exhibit 10.2 MUTUAL AGREEMENT ON TRANSITION AND GENERAL RELEASE Caution: Read Carefully This Is A Release Of All Claims THIS MUTUAL AGREEMENT ON TRANSITION AND GENERAL RELEASE ("Agreement") is voluntarily entered into as of the date(s) set forth below by and between the undersigned individual employee, Annette W. Cyr, and Great Lakes Dredge & Dock Corporation ("C

March 26, 2021 DEFA14A

- DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defin

March 26, 2021 DEF 14A

- DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defin

February 24, 2021 EX-21.1

Subsidiaries of Great Lakes Dredge & Dock Corporation. *

Exhibit 21.1 SUBSIDIARIES OF THE REGISTRANT Name Jurisdiction of Incorporation Great Lakes Dredge & Dock Company, LLC Delaware Great Lakes U.S. Fleet Management, LLC Delaware Great Lakes Environmental & Infrastructure Solutions, LLC Delaware Great Lakes Dredge & Dock do Brasil Ltda. Brazil Great Lakes Dredge & Dock (Bahamas) Ltd. Bahamas NASDI Holdings, LLC Delaware Terra Contracting Services, LLC

February 24, 2021 10-K

Annual Report - 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dr

February 24, 2021 EX-10.8

SEPARATION AND GENERAL RELEASE AGREEMENT Caution: Read Carefully This Is A Release Of All Claims

EX-10.8 2 gldd-ex108816.htm EX-10.8 Exhibit 10.8 SEPARATION AND GENERAL RELEASE AGREEMENT Caution: Read Carefully This Is A Release Of All Claims THIS SEPARATION AND GENERAL RELEASE AGREEMENT ("Agreement") is voluntarily entered into as of the date(s) set forth below by and between the undersigned individual employee, Kathleen M. LaVoy ("LaVoy"), and Great Lakes Dredge & Dock Corporation with and

February 17, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 17, 2021 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporat

February 17, 2021 EX-99.1

Great Lakes Reports Fourth Quarter and Full Year Results Fourth quarter income from continuing operations of $10.6 million Fourth quarter adjusted EBITDA from continuing operations of $29.4 million Full year income from continuing operations of $66.1

EXHIBIT 99.1 Great Lakes Reports Fourth Quarter and Full Year Results Fourth quarter income from continuing operations of $10.6 million Fourth quarter adjusted EBITDA from continuing operations of $29.4 million Full year income from continuing operations of $66.1 million Full year adjusted EBITDA from continuing operations of $151.1 million Backlog of $559.4 million at December 31, 2020 Cash posit

February 16, 2021 SC 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No.   ) * Great Lakes Dredge & Dock Corporation (Name of Issuer) Common Stock, $0.0001 Par Value Per Share (Titl

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No.   ) * Great Lakes Dredge & Dock Corporation (Name of Issuer) Common Stock, $0.0001 Par Value Per Share (Title of Class of Securities) 390607109 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of This Statement) Check the appropriate box

February 12, 2021 SC 13G/A

SCHEDULE 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 9 )* Great Lakes Dredge & Dock Corp (Name of Issuer) Common Stock (Title of Class of Securities) 390607109 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to wh

February 10, 2021 SC 13G/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 1)*

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 1)* Name of issuer: Great Lakes Dredge & Dock Corp. Title of Class of Securities: Common Stock CUSIP Number: 390607109 Date of Event Which Requires Filing of this Statement: December 31, 2020 Check the appropriate box to designate the rule pursuant to which this Schedule

February 9, 2021 SC 13G/A

By signing below, Prudential Financial, Inc. certifies that, to the best of its

13G HTML File DOCUMENT TYPE SC 13G/A TEXT SECURITIES AND EXCHANGE COMMISSION Washington, D.

December 8, 2020 8-K

- 8-K-CLO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 7, 2020 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 20-5336063 (State or other jurisdiction of incorporation) 001-33

November 4, 2020 EX-99.1

Great Lakes Reports Third Quarter Results Third quarter income from continuing operations of $12.5 million Third quarter adjusted EBITDA from continuing operations of $32.2 million Backlog of $661.3 million at September 30, 2020 Cash position of $229

EXHIBIT 99.1 Great Lakes Reports Third Quarter Results Third quarter income from continuing operations of $12.5 million Third quarter adjusted EBITDA from continuing operations of $32.2 million Backlog of $661.3 million at September 30, 2020 Cash position of $229.7 million at September 30, 2020 Company moving headquarters to Houston, Texas OAKBROOK TERRACE, Ill., Nov. 04, 2020 (GLOBE NEWSWIRE) - G

November 4, 2020 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dred

November 4, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition - FORM 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 4, 2020 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporati

August 5, 2020 EX-99.1

News from Great Lakes Dredge & Dock Corporation

EXHIBIT 99.1 News from Great Lakes Dredge & Dock Corporation For further information contact: Tina Baginskis Director, Investor Relations 630-574-3024 Great Lakes Announces Share Repurchase Program OAK BROOK, Ill., August 4, 2020 (GLOBE NEWSWIRE) - - Great Lakes Dredge & Dock Corporation (“Great Lakes” or the “Company”) (NASDAQ:GLDD), the largest provider of dredging services in the United States

August 5, 2020 8-K

Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 31, 2020 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 20-5336063 (State or other jurisdiction of incorporation) 001-33225

August 4, 2020 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dredge &

August 4, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 4, 2020 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporation

August 4, 2020 EX-99.1

Great Lakes Reports Second Quarter Results Second quarter income from continuing operations of $9.0 million Year to date income from continuing operations of $42.9 million Second quarter adjusted EBITDA from continuing operations of $28.1 million Yea

EXHIBIT 99.1 Great Lakes Reports Second Quarter Results Second quarter income from continuing operations of $9.0 million Year to date income from continuing operations of $42.9 million Second quarter adjusted EBITDA from continuing operations of $28.1 million Year to date adjusted EBITDA from continuing operations of $89.5 million Cash position of $233.5 million at June 30, 2020 OAK BROOK, Ill., A

August 4, 2020 EX-10.1

Vessel Construction Agreement, dated June 5, 2020 by and between Conrad Shipyard, L.L.C., and Great Lakes Dredge & Dock Company, LLC. (Incorporated by reference to Great Lakes Dredge & Dock Corporation’s Quarterly Report on Form 10-Q filed with the Commission on August 4, 2020). (1)

EXHIBIT 10.1 CERTAIN IDENTIFIED INFORMATION HAS BEEN EXCLUDED FROM THE EXHIBIT BECAUSE IT IS BOTH NOT MATERIAL AND WOULD LIKELY CAUSE COMPETITIVE HARM TO THE REGISTRANT IF PUBLICLY DISCLOSED. [***] INDICATES THAT INFORMATION HAS BEEN REDACTED. Confidential Commercial InformationExecution Version VESSEL CONSTRUCTION AGREEMENT BY AND BETWEEN CONRAD SHIPYARD, L.L.C. (Builder) AND GREAT LAKES DREDGE &

June 9, 2020 8-K

Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 5, 2020 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 20-5336063 (State or other jurisdiction of incorporation) 001-33225

June 9, 2020 EX-99.1

News from Great Lakes Dredge & Dock Corporation

EXHIBIT 99.1 us News from Great Lakes Dredge & Dock Corporation For further information contact: Tina Baginskis Director, Investor Relations 630-574-3024 Great Lakes Announces Shipyard Contract for 6,500 cubic yard Trailing Suction Hopper Dredge OAK BROOK, Ill., June 9, 2020 (GLOBE NEWSWIRE) - - Great Lakes Dredge & Dock Corporation (“Great Lakes” or the “Company”) (NASDAQ:GLDD), the largest provi

May 11, 2020 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 6, 2020 Commission file number: 001-33225 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 (Commission File Number)

May 5, 2020 EX-99.1

Great Lakes Reports Record First Quarter First quarter net income from continuing operations of $34.0 million First quarter adjusted EBITDA from continuing operations of $61.4 million Cash position of $207.5 million at March 31, 2020

EXHIBIT 99.1 Great Lakes Reports Record First Quarter First quarter net income from continuing operations of $34.0 million First quarter adjusted EBITDA from continuing operations of $61.4 million Cash position of $207.5 million at March 31, 2020 OAK BROOK, Ill., May 05, 2020 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (Nasdaq:GLDD), the largest provider of dredging services in the Un

May 5, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event Reported): May 5, 2020 Great Lakes Dredge & Dock Corporation (Exact Name of Registrant as Specified in Charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporation) (Comm

May 5, 2020 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2020 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dredge &

May 1, 2020 DEFA14A

- DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Defin

March 24, 2020 DEFA14A

GLDD / Great Lakes Dredge & Dock Corp. DEFA14A - - DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Defin

March 24, 2020 DEF 14A

GLDD / Great Lakes Dredge & Dock Corp. DEF 14A - - DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Defin

March 18, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 12, 2020 Commission file number: 001-33225 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 (Commission File Numbe

February 26, 2020 EX-4.1

DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934

Exhibit 4.1 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 Great Lakes Dredge & Dock Holdings Corp. (the “Corporation,” “we,” “us” or “our”) has one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”): our common stock. DESCRIPTION OF CAPITAL STOCK The following

February 26, 2020 EX-21.1

Subsidiaries of Great Lakes Dredge & Dock Corporation. *

Exhibit 21.1 SUBSIDIARIES OF THE REGISTRANT Name Jurisdiction of Incorporation Great Lakes Dredge & Dock Company, LLC Delaware Great Lakes U.S. Fleet Management, LLC Delaware Great Lakes Dredge & Dock Environmental, Inc. (merged into Great Lakes Environmental & Infrastructure Solutions, LLC on December 31, 2019) Delaware Great Lakes Dredge & Dock Australia Pty Ltd (deregistered on July 7, 2019) Au

February 26, 2020 10-K

Annual Report - 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dr

February 19, 2020 EX-99.1

Great Lakes Reports Record Full Year Results Full year net income from continuing operations of $55.7 million Full year Adjusted EBITDA from continuing operations of $135.6 million Net debt reduction of $163.2 million for the full year Backlog of $58

EXHIBIT 99.1 Great Lakes Reports Record Full Year Results Full year net income from continuing operations of $55.7 million Full year Adjusted EBITDA from continuing operations of $135.6 million Net debt reduction of $163.2 million for the full year Backlog of $589.4 million at December 31, 2019 OAK BROOK, Ill., Feb. 19, 2020 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (Nasdaq:GLDD), t

February 19, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event Reported): February 19, 2020 Great Lakes Dredge & Dock Corporation (Exact Name of Registrant as Specified in Charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporation)

February 12, 2020 SC 13G/A

GLDD / Great Lakes Dredge & Dock Corp. / DIMENSIONAL FUND ADVISORS LP - SCHEDULE 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 8)* GREAT LAKES DREDGE & DOCK CO (Name of Issuer) Common Stock (Title of Class of Securities) 390607109 (CUSIP Number) December 31, 2019 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which

February 11, 2020 SC 13G

GLDD / Great Lakes Dredge & Dock Corp. / VANGUARD GROUP INC - SCHEDULE 13G Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 Name of issuer: Great Lakes Dredge & Dock Corp Title of Class of Securities: Common Stock CUSIP Number: 390607109 Date of Event Which Requires Filing of this Statement: December 31, 2019 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ☒ Rule 13d

February 3, 2020 SC 13G/A

GLDD / Great Lakes Dredge & Dock Corp. / PRUDENTIAL FINANCIAL INC Passive Investment

13G HTML File DOCUMENT TYPE SC 13G/A TEXT SECURITIES AND EXCHANGE COMMISSION Washington, D.

January 13, 2020 8-K

Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 7, 2020 Commission file number: 001-33225 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 (Commission File Numb

January 13, 2020 EX-99.1

Great Lakes Announces a New Appointment to the Board of Directors

EXHIBIT 99.1 News from Great Lakes Dredge & Dock Corporation For further information contact: Tina Baginskis Director, Investor Relations 630-574-3024 Great Lakes Announces a New Appointment to the Board of Directors OAK BROOK, Ill., Jan. 8, 2020 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation ("Great Lakes") (NASDAQ:GLDD), the largest provider of dredging services in the United States an

November 5, 2019 10-Q

GLDD / Great Lakes Dredge & Dock Corp. 10-Q - Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2019 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dred

November 5, 2019 EX-99.1

Great Lakes Reports Third Quarter Financial Results Net income from continuing operations of $8.8M Backlog at $653.7M at September 30, 2019 Cash balance of $180.9M at September 30, 2019

EXHIBIT 99.1 Great Lakes Reports Third Quarter Financial Results Net income from continuing operations of $8.8M Backlog at $653.7M at September 30, 2019 Cash balance of $180.9M at September 30, 2019 OAK BROOK, Ill., Nov. 05, 2019 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (Nasdaq:GLDD), the largest provider of dredging services in the United States, today reported financial results f

November 5, 2019 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event Reported): November 5, 2019 Great Lakes Dredge & Dock Corporation (Exact Name of Registrant as Specified in Charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporation)

August 2, 2019 EX-10.3

CONSULTING AGREEMENT

Exhibit 10.3 CONSULTING AGREEMENT THIS CONSULTING AGREEMENT is made and entered into this 31st day of July, 2019 (“Effective Date”), by and between Great Lakes Dredge & Dock Corporation with and on behalf of its wholly owned subsidiary, Great Lakes Environmental & Infrastructure Solutions, LLC (collectively the “Company”) and Christopher P. Shea (“Consultant”). WHEREAS, the Company desires to enga

August 2, 2019 10-Q

GLDD / Great Lakes Dredge & Dock Corp. 10-Q - Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2019 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dredge &

August 2, 2019 EX-10.2

SEPARATION AND GENERAL RELEASE AGREEMENT Caution: Read Carefully This Is A Release Of All Claims

Exhibit 10.2 SEPARATION AND GENERAL RELEASE AGREEMENT Caution: Read Carefully This Is A Release Of All Claims THIS SEPARATION AND GENERAL RELEASE AGREEMENT ("Agreement") is voluntarily entered into as of the date(s) set forth below by and between the undersigned individual employee, Christopher P. Shea, and Great Lakes Dredge & Dock Corporation with and on behalf of its wholly owned subsidiary, Gr

July 31, 2019 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event Reported): July 31, 2019 Great Lakes Dredge & Dock Corporation (Exact Name of Registrant as Specified in Charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporation) (Co

July 31, 2019 EX-99.1

Great Lakes Reports Second Quarter Financial Results Net income from continuing operations of $11.5M Completed sale of Environmental & Infrastructure business Closed new five-year Revolving Credit Facility

EXHIBIT 99.1 Great Lakes Reports Second Quarter Financial Results Net income from continuing operations of $11.5M Completed sale of Environmental & Infrastructure business Closed new five-year Revolving Credit Facility OAK BROOK, Ill., July 31, 2019 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (Nasdaq:GLDD), the largest provider of dredging services in the United States, today reported

May 9, 2019 EX-10.1

Amended and Restated Revolving Credit and Security Agreement dated as of May 3, 2019 by and among Great Lakes Dredge & Dock Corporation, as Borrower, each other Credit Party party hereto from time to time, the financial institutions which are now or which hereafter become a party hereto as lenders, PNC Capital Markets, CIBC Bank, USA, Suntrust Robinson Humphrey, Inc., and Bank of America, N.A., as joint lead arrangers and joint bookrunners, HSBC Bank USA, N.A., as documentation agent, and PNC Bank, National Association, as lender and as agent.

EXHIBIT 10.1 [*] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN OMITTED BECAUSE IT IS BOTH (1) NOT MATERIAL TO INVESTORS AND (2) LIKELY TO CAUSE COMPETITIVE HARM TO THE COMPANY IF PUBLICLY DISCLOSED. AMENDED AND RESTATED REVOLVING CREDIT AND SECURITY AGREEMENT PNC CAPITAL MARKETS, CIBC BANK USA, SunTrust robinson humphrey, inc., AND BANK OF AMERICA, N.A

May 9, 2019 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 3, 2019 Commission file number: 001-33225 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 (Commission File Number)

May 8, 2019 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 2, 2019 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 001-33225 (Commission File Number) 20-5336063 (State or other jurisdi

May 3, 2019 EX-10.1

Restricted Stock Unit Award Notice pursuant to the Great Lakes Dredge & Dock Corporation 2017 Long-Term Incentive Plan. (Incorporated by reference to Great Lakes Dredge & Dock Corporation’s Quarterly Report on Form 10-Q filed with the Commission on May 3, 2019). †

Exhibit 10.1 [TIME-BASED RSU AGMT] Great Lakes Dredge & Dock Corporation 2017 Long-Term Incentive Plan Restricted Stock Unit Award Notice [Participant Name] You have been awarded a restricted stock unit award with respect to shares of common stock of Great Lakes Dredge & Dock Corporation, a Delaware corporation (the “Corporation”), pursuant to the terms and conditions of the Great Lakes Dredge & D

May 3, 2019 EX-10.2

Performance-Based Restricted Stock Unit Award Notice pursuant to the Great Lakes Dredge & Dock Corporation 2017 Long-Term Incentive Plan. (Incorporated by reference to Great Lakes Dredge & Dock Corporation’s Quarterly Report on Form 10-Q filed with the Commission on May 3, 2019). †

EX-10.2 3 gldd-ex10284.htm EX-10.2 Exhibit 10.2 bit [PERFORMANCE-BASED RSU AGMT – THREE YEAR FORM] Great Lakes Dredge & Dock Corporation 2017 Long-Term Incentive Plan Performance-Based Restricted Stock Unit Award Notice [Participant Name] You have been awarded a performance-based restricted stock unit award with respect to shares of common stock of Great Lakes Dredge & Dock Corporation, a Delaware

May 3, 2019 10-Q

GLDD / Great Lakes Dredge & Dock Corp. 10-Q Quarterly Report 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2019 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dredge &

April 30, 2019 EX-99.1

Great Lakes Reports Strong First Quarter First quarter net income from continuing operations $20.5 million First quarter adjusted EBITDA from continuing operations $43.8 million Cash borrowings reduced to zero; Cash position of $123 million

EXHIBIT 99.1 Great Lakes Reports Strong First Quarter First quarter net income from continuing operations $20.5 million First quarter adjusted EBITDA from continuing operations $43.8 million Cash borrowings reduced to zero; Cash position of $123 million OAK BROOK, Ill., April 30, 2019 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (NASDAQ:GLDD), the largest provider of dredging services

April 30, 2019 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event Reported): April 30, 2019 Great Lakes Dredge & Dock Corporation (Exact Name of Registrant as Specified in Charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporation) (C

April 22, 2019 DEFA14A

GLDD / Great Lakes Dredge & Dock Corp. DEFA14A - AMENDMENT PURSUANT TO STOCKHOLDER OUTREACH FOR ANNUAL VOTE ON SAY-ON-PAY

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confide

March 21, 2019 DEFA14A

GLDD / Great Lakes Dredge & Dock Corp. DEFA14A

DEFA14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐

March 21, 2019 DEF 14A

GLDD / Great Lakes Dredge & Dock Corp. DEF 14A

DEF 14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐

March 6, 2019 SC 13D/A

GLDD / Great Lakes Dredge & Dock Corp. / Privet Fund Management LLC - SC 13D/A Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 2)* Great Lakes Dredge & Dock Corporation (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 390607109 (CUSIP Number) Privet Fund LP Attn: Ryan Levenson 79 West Paces Ferry Road Suite 200B Atlanta, GA 30305 With a copy

February 26, 2019 10-K

GLDD / Great Lakes Dredge & Dock Corp. 10-K (Annual Report)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2018 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dr

February 26, 2019 EX-21.1

SUBSIDIARIES OF THE REGISTRANT

Exhibit 21.1 SUBSIDIARIES OF THE REGISTRANT Name Jurisdiction of Incorporation Great Lakes Dredge & Dock Company, LLC Delaware Great Lakes U.S. Fleet Management, LLC Delaware Dawson Marine Services Company (dissolved as of December 27, 2017) Delaware Great Lakes Dredge & Dock Environmental, Inc. Delaware Fifty-Three Dredging Corporation (dissolved as of December 27, 2017) New Jersey Great Lakes Dr

February 20, 2019 EX-99.1

Great Lakes Reports Strong Fourth Quarter and Full Year Results Full year net income from continuing operations $11.0 million Full year Adjusted EBITDA from continuing operations, excluding restructuring $109.8 million Net debt reduction of $115 mill

EXHIBIT 99.1 Great Lakes Reports Strong Fourth Quarter and Full Year Results Full year net income from continuing operations $11.0 million Full year Adjusted EBITDA from continuing operations, excluding restructuring $109.8 million Net debt reduction of $115 million for the full year Backlog of over $707 million as of year-end 2018, up nearly $200 million from the prior year Expects to divest Envi

February 20, 2019 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event Reported): February 20, 2019 Great Lakes Dredge & Dock Corporation (Exact Name of Registrant as Specified in Charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporation)

February 8, 2019 SC 13G/A

GLDD / Great Lakes Dredge & Dock Corp. / DIMENSIONAL FUND ADVISORS LP - SCHEDULE 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 7)* GREAT LAKES DREDGE & DOCK CO (Name of Issuer) Common Stock (Title of Class of Securities) 390607109 (CUSIP Number) December 31, 2018 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which

January 31, 2019 SC 13G

GLDD / Great Lakes Dredge & Dock Corp. / Russell Investments Group, Ltd. - FORM SCHEDULE 13G Passive Investment

Form Schedule 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Great Lakes Dredge & Dock Co. (Name of Issuer) Common Stock (Title of Class of Securities) 390607109 (CUSIP Number) December 31, 2018 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule

January 31, 2019 SC 13G/A

GLDD / Great Lakes Dredge & Dock Corp. / PRUDENTIAL FINANCIAL INC Passive Investment

13G HTML File DOCUMENT TYPE SC 13G/A TEXT SECURITIES AND EXCHANGE COMMISSION Washington, D.

November 6, 2018 EX-99.1

Great Lakes Reports Third Quarter Results

EXHIBIT 99.1 Great Lakes Reports Third Quarter Results OAK BROOK, Ill., Nov. 06, 2018 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (NASDAQ:GLDD), the largest provider of dredging services in the United States and a major provider of environmental and infrastructure services, today reported financial results for the three and nine months ended September 30, 2018. For the three months en

November 6, 2018 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event Reported): November 6, 2018 Great Lakes Dredge & Dock Corporation (Exact Name of Registrant as Specified in Charter) Delaware 001-33225 20-5336063 (State or Other Jurisdiction of Incorporation)

November 6, 2018 EX-10.1

FIRST AMENDMENT TO EMPLOYMENT AGREEMENT

Exhibit 10.1 FIRST AMENDMENT TO EMPLOYMENT AGREEMENT This FIRST AMENDMENT TO EMPLOYMENT AGREEMENT (the “Amendment”) is made as of the 31st day of July, 2018 (the “Agreement Date”), by and between Great Lakes Dredge & Dock Corporation (the “Corporation”), with and on behalf of its wholly-owned subsidiary, Great Lakes Dredge & Dock Environmental & Infrastructure Solutions, LLC (the “Company”), and C

November 6, 2018 10-Q

GLDD / Great Lakes Dredge & Dock Corp. 10-Q (Quarterly Report)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2018 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dred

August 1, 2018 EX-99.1

Great Lakes Reports Second Quarter Results

EX-99.1 2 exh991.htm PRESS RELEASE EXHIBIT 99.1 Great Lakes Reports Second Quarter Results OAK BROOK, Ill., Aug. 01, 2018 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (NASDAQ:GLDD), the largest provider of dredging services in the United States and a major provider of environmental and infrastructure services, today reported financial results for the three and six months ended June 30,

August 1, 2018 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event Reported): August 1, 2018 Great Lakes Dredge & Dock Corporation (Exact Name of Registrant as Specified in Charter) DELAWARE 001-33225 20-5336063 (State or Other Jurisdiction of Incorporation) (C

August 1, 2018 10-Q

GLDD / Great Lakes Dredge & Dock Corp. 10-Q (Quarterly Report)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2018 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dredge &

May 8, 2018 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 2, 2018 Commission file number: 001-33225 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 20-5336063 (State or other jurisdic

May 4, 2018 10-Q

GLDD / Great Lakes Dredge & Dock Corp. 10-Q (Quarterly Report)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2018 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dredge &

May 4, 2018 EX-10.3

[PERFORMANCE-BASED RSU AGMT—TWO YEAR FORM] Great Lakes Dredge & Dock Corporation 2017 Long-Term Incentive Plan Performance-Based Restricted Stock Unit Award Notice

Exhibit 10.3 [PERFORMANCE-BASED RSU AGMT—TWO YEAR FORM] Great Lakes Dredge & Dock Corporation 2017 Long-Term Incentive Plan Performance-Based Restricted Stock Unit Award Notice [Participant Name] You have been awarded a performance-based restricted stock unit award with respect to shares of common stock of Great Lakes Dredge & Dock Corporation, a Delaware corporation (the “Corporation”), pursuant

May 4, 2018 EX-18.1

March 29, 2018

Exhibit 18.1 March 29, 2018 Great Lakes Dredge & Dock Corporation 2122 York Road Oak Brook, IL 60523 Dear Sirs/Madams: At your request, we have read the description included in your Quarterly Report on Form 10-Q to the Securities and Exchange Commission for the quarter ended March 31, 2018, of the facts relating to the change in accounting policy from allocating annual fixed equipment-related cost

May 4, 2018 EX-10.1

Form of Great Lakes Dredge & Dock Corporation Restricted Stock Unit Award Agreement pursuant to the Great Lakes Dredge & Dock Corporation 2017 Long-Term Incentive Plan. (Incorporated by reference to Great Lakes Dredge & Dock Corporation’s Quarterly Report on Form 10-Q filed with the Commission on May 4, 2018). †

Exhibit 10.1 [TIME-BASED RSU AGMT] Great Lakes Dredge & Dock Corporation 2017 Long-Term Incentive Plan Restricted Stock Unit Award Notice [Participant Name] You have been awarded a restricted stock unit award with respect to shares of common stock of Great Lakes Dredge & Dock Corporation, a Delaware corporation (the “Corporation”), pursuant to the terms and conditions of the Great Lakes Dredge & D

May 4, 2018 EX-10.2

Form of Great Lakes Dredge & Dock Corporation Performance-Based Restricted Stock Unit Award Agreement (Three Year Form) pursuant to the Great Lakes Dredge & Dock Corporation 2017 Long-Term Incentive Plan. (Incorporated by reference to Great Lakes Dredge & Dock Corporation’s Quarterly Report on Form 10-Q filed with the Commission on May 4, 2018). †

Exhibit 10.2 [PERFORMANCE-BASED RSU AGMT—THREE YEAR FORM] Great Lakes Dredge & Dock Corporation 2017 Long-Term Incentive Plan Performance-Based Restricted Stock Unit Award Notice [Participant Name] You have been awarded a performance-based restricted stock unit award with respect to shares of common stock of Great Lakes Dredge & Dock Corporation, a Delaware corporation (the “Corporation”), pursuan

May 4, 2018 EX-10.4

SECOND AMENDED AND RESTATED EMPLOYMENT AGREEMENT

EX-10.4 5 gldd-ex104176.htm EX-10.4 Exhibit 10.4 SECOND AMENDED AND RESTATED EMPLOYMENT AGREEMENT This SECOND AMENDED AND RESTATED EMPLOYMENT AGREEMENT (the “Agreement”) is made as of this 21st day of December, 2016 (the “Agreement Date”), by and between Great Lakes Dredge & Dock Corporation (the “Corporation”), with and on behalf of its wholly-owned subsidiary, Great Lakes Dredge & Dock Company,

May 2, 2018 EX-99.1

Great Lakes Reports First Quarter Results

EXHIBIT 99.1 Great Lakes Reports First Quarter Results OAK BROOK, Ill., May 02, 2018 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (NASDAQ:GLDD), the largest provider of dredging services in the United States and a major provider of environmental and infrastructure services, today reported financial results for the quarter ended March 31, 2018. For the three months ended March 31, 2018,

May 2, 2018 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event Reported): May 2, 2018 Great Lakes Dredge & Dock Corporation (Exact Name of Registrant as Specified in Charter) DELAWARE 001-33225 20-5336063 (State or Other Jurisdiction of Incorporation) (Comm

April 23, 2018 DEFA14A

GLDD / Great Lakes Dredge & Dock Corp. DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confide

March 21, 2018 DEFA14A

GLDD / Great Lakes Dredge & Dock Corp. DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confide

March 21, 2018 DEF 14A

GLDD / Great Lakes Dredge & Dock Corp. DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A (RULE 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confide

March 13, 2018 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 7, 2018 Commission file number: 001-33225 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 20-5336063 (State or other jurisd

March 1, 2018 EX-99.2

Amboy Aggregates Joint Venture and Subsidiaries Consolidated Financial Statements and Independent Auditor's Reports As of December 31, 2016 (unaudited) and for the Period from January 1, 2017 to December 29, 2017 (unaudited), the Year Ended December

Exhibit 99.2 Amboy Aggregates Joint Venture and Subsidiaries Consolidated Financial Statements and Independent Auditor's Reports As of December 31, 2016 (unaudited) and for the Period from January 1, 2017 to December 29, 2017 (unaudited), the Year Ended December 31, 2016 (unaudited) and for the Periods from January 1, 2015 to June 30, 2015 and July 1, 2015 to December 31, 2015 Amboy Aggregates Joi

March 1, 2018 EX-10.36

CONSENT AND AMENDMENT NO. 3 TO REVOLVING CREDIT AND SECURITY AGREEMENT

PORTIONS OF THIS EXHIBIT HAVE BEEN REDACTED PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT UNDER RULE 24B-2 OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED.

March 1, 2018 EX-12.1

Ratio of Earnings to Fixed Charges Great Lakes Dredge & Dock Corporation (dollars in thousands)

Exhibit 12.1 Ratio of Earnings to Fixed Charges Great Lakes Dredge & Dock Corporation (dollars in thousands) 2013 2014 2015 2016 2017 Pretax income (loss) from continuing operations (1) $ 29,109 $ 6,293 $ (2,635 ) $ (11,604 ) $ (52,689 ) Fixed charges 28,556 27,766 31,007 29,549 31,759 Capitalized Interest (522 ) (1,401 ) (3,227 ) (5,628 ) (7,572 ) Distributed income of equity investees — — — — —

March 1, 2018 EX-10.25

Great Lakes Dredge & Dock Corporation Director Deferral Plan, adopted on November 8, 2017 (Incorporated by reference to Great Lakes Dredge & Dock Corporation’s Annual Report on Form 10-K filed with the Commission on February 28, 2018).†

Exhibit 10.25 GREAT LAKES DREDGE & DOCK CORPORATION DIRECTOR DEFERRAL PLAN 1. Purpose. The purpose of the Great Lakes Dredge & Dock Corporation Director Deferral Plan (this “Plan”) is to promote the interests of the Corporation, its subsidiaries, and its stockholders by strengthening the Corporation’s ability to attract and retain directors of experience and ability by (a) allowing them to acquire

March 1, 2018 10-K

GLDD / Great Lakes Dredge & Dock Corp. 10-K (Annual Report)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2017 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-33225 Great Lakes Dr

March 1, 2018 EX-21.1

SUBSIDIARIES OF THE REGISTRANT

Exhibit 21.1 SUBSIDIARIES OF THE REGISTRANT Name Jurisdiction of Incorporation Great Lakes Dredge & Dock Company, LLC Delaware Great Lakes U.S. Fleet Management, LLC Delaware Dawson Marine Services Company (dissolved as of December 27, 2017) Delaware Great Lakes Dredge & Dock Environmental, Inc. Delaware Fifty-Three Dredging Corporation (dissolved as of December 27, 2017) New Jersey Great Lakes Dr

March 1, 2018 EX-99.1

TerraSea Environmental Solutions, LLC Financial Statements as of December 31, 2016 (Unaudited) and for the Period from January 1, 2017 to August 28, 2017 (Unaudited) and for the Years Ended December 31, 2016 (Unaudited) and 2015, and Independent Audi

Exhibit 99.1 TerraSea Environmental Solutions, LLC Financial Statements as of December 31, 2016 (Unaudited) and for the Period from January 1, 2017 to August 28, 2017 (Unaudited) and for the Years Ended December 31, 2016 (Unaudited) and 2015, and Independent Auditor’s Report TERRASEA ENVIRONMENTAL SOLUTIONS, LLC Table of contents Page INDEPENDENT AUDITOR’S REPORT 2-3 FINANCIAL STATEMENTS AS OF DEC

February 20, 2018 EX-99.1

Great Lakes Reports Year-End Results Including $29.5m Charge for Restructuring Costs; Confirms Savings Initiatives on Track

EdgarFiling EXHIBIT 99.1 Great Lakes Reports Year-End Results Including $29.5m Charge for Restructuring Costs; Confirms Savings Initiatives on Track OAK BROOK, Ill., Feb. 20, 2018 (GLOBE NEWSWIRE) - Great Lakes Dredge & Dock Corporation (NASDAQ:GLDD), the largest provider of dredging services in the United States and a major provider of environmental and infrastructure services, today reported fin

February 20, 2018 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event Reported): February 20, 2018 Great Lakes Dredge & Dock Corporation (Exact Name of Registrant as Specified in Charter) DELAWARE 001-33225 20-5336063 (State or Other Jurisdiction of Incorporation)

February 12, 2018 SC 13G/A

GLDD / Great Lakes Dredge & Dock Corp. / Boston Partners - ROBECO INVESTMENT MANAGEMENT INC. Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 4)* GREAT LAKES DREDGE & DOCK CORP (Name of Issuer) common stock (Title of Class of Securities) 390607109 (CUSIP Number) December 31, 2017 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to whi

February 9, 2018 SC 13G/A

GLDD / Great Lakes Dredge & Dock Corp. / DIMENSIONAL FUND ADVISORS LP - SCHEDULE 13G/A Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 6)* GREAT LAKES DREDGE & DOCK CO (Name of Issuer) Common Stock (Title of Class of Securities) 390607109 (CUSIP Number) December 31, 2017 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which

February 8, 2018 SC 13G/A

GLDD / Great Lakes Dredge & Dock Corp. / Wellington Management Group LLP - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 4 )* Great Lakes Dredge & Dock Corporation (Name of Issuer) Common Stock (Title of Class of Securities) 390607109 (CUSIP Number) December 29, 2017 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuan

January 26, 2018 SC 13G/A

GLDD / Great Lakes Dredge & Dock Corp. / PRUDENTIAL FINANCIAL INC Passive Investment

13G HTML File DOCUMENT TYPE SC 13G/A TEXT SECURITIES AND EXCHANGE COMMISSION Washington, D.

December 12, 2017 8-K

GLDD / Great Lakes Dredge & Dock Corp. 2017-12-12-8-K (Current Report)

gldd-8k20171206.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 6, 2017 Commission file number: 001-33225 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 20-5336063

November 30, 2017 EX-99.1

Great Lakes Announces Changes to Board of Directors

gldd-ex9917.htm EXHIBIT 99.1 News from Great Lakes Dredge & Dock Corporation For further information contact: Abby Sullivan, Investor Relations 630-574-3024 Great Lakes Announces Changes to Board of Directors Oak Brook, Illinois ? November 30, 2017 ? Great Lakes Dredge & Dock Corporation (the ?Company? or ?Great Lakes?) (NASDAQ:GLDD), the largest provider of dredging services in the United States

November 30, 2017 8-K

Financial Statements and Exhibits

gldd-8k20171128.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 28, 2017 Commission file number: 001-33225 Great Lakes Dredge & Dock Corporation (Exact name of registrant as specified in its charter) Delaware 20-533606

November 21, 2017 CORRESP

GLDD / Great Lakes Dredge & Dock Corp. ESP

gldd-corresp.htm GLDDCORP.COM 2122 YORK ROAD, OAK BROOK, IL. 60523 P 630.574.3000 | F 630.574.3007 November 21, 2017 VIA EDGAR SUBMISSION Mr. John Cash United States Securities and Exchange Commission Division of Corporation Finance Washington, D.C. 20549 Re: Great Lakes Dredge & Dock Corporation Form 10-K for the year ended December 31, 2016 Filed February 28, 2017 File No. 1-33225 Dear Mr. Cash:

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