NB / NioCorp Developments Ltd. - SEC फाइलिंग, वार्षिक रिपोर्ट, प्रॉक्सी स्टेटमेंट

NioCorp डेवलपमेंट्स लिमिटेड
US ˙ NasdaqGM ˙ CA6544846091

मूलभूत आँकड़े
LEI 5299001QL26XJPOD3A17
CIK 1512228
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 NioCorp Developments Ltd.
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 12, 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 9, 2025 NioCorp Developmen

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 9, 2025 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 001-41655 (Comm

August 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): August 4, 2025 NioCorp Developmen

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, 2025 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (Comm

August 4, 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 1, 2025 NioCorp Developmen

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, 2025 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (Comm

July 23, 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): July 22, 2025 NioCorp Development

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 22, 2025 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 001-41655 (Commi

July 18, 2025 EX-FILING FEES

EX-FILING FEES

Exhibit 107 The prospectus supplement to which this exhibit is attached is a final prospectus for the related offering. The maximum aggregate offering price of that offering is $45,012,500.00.

July 18, 2025 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): July 18, 2025 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 001-41655 (Commi

July 18, 2025 424B3

13,850,000 Common Shares

Filed Pursuant to Rule 424(b)(3) Registration No.: 333-280176 Prospectus Supplement (to Prospectus dated June 27, 2024) 13,850,000 Common Shares We are offering 13,850,000 of our common shares, without par value (“Common Shares”). The public offering price for each Common Share is $3.25. The Common Shares are being sold on a “reasonable best efforts” basis. See “Plan of Distribution.” Our Common S

July 18, 2025 EX-1.1

PLACEMENT AGENCY AGREEMENT

Exhibit 1.1   PLACEMENT AGENCY AGREEMENT July 17, 2025 Maxim Group LLC 300 Park Avenue, 16th Floor New York, NY 10022   Ladies and Gentlemen: Subject to the terms and conditions herein (this “Agreement”), NioCorp Developments Ltd., a company incorporated under the laws of the Province of British Columbia (the “Company”), hereby agrees to sell up to an aggregate of $45,012,500 Closing Shares (as he

July 17, 2025 424B3

Subject to Completion Preliminary Prospectus Supplement, dated July 16, 2025

Filed Pursuant to Rule 424(b)(3) Registration No.: 333-280176 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are part of an effective registration statement filed with the Securities and Exchange Commission and are not offers to sell nor solicitations of offers to buy these securit

July 16, 2025 EX-99.1

NioCorp Provides Preliminary Unaudited Financial Results for the Fiscal Year Ended June 30, 2025

Exhibit 99.1 NioCorp Provides Preliminary Unaudited Financial Results for the Fiscal Year Ended June 30, 2025 CENTENNIAL, Colo. (July 11, 2025) – NioCorp Developments Ltd. (“NioCorp” or the “Company”) (NASDAQ:NB) today provided its preliminary unaudited financial results for the fiscal year ended June 30, 2025. Selected financial results expectations for the period includes: · Loss for the fiscal

July 16, 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): July 11, 2025 NioCorp Development

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 11, 2025 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 001-41655 (Commi

May 21, 2025 8-K

Regulation FD Disclosure, 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): May 21, 2025 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 001-41655 (Commis

May 21, 2025 EX-99.1

B RINGING H OME C RITICAL MINERALS S UPPLY C HAINS Disclaimers & Technical Disclosures Forward - Looking Statements This Presentation of NioCorp Developments Ltd. (“NioCorp”) contains forward - looking statements within the meaning of the United Stat

Exhibit 99.1 B RINGING H OME C RITICAL MINERALS S UPPLY C HAINS Disclaimers & Technical Disclosures Forward - Looking Statements This Presentation of NioCorp Developments Ltd. (“NioCorp”) contains forward - looking statements within the meaning of the United States federal securities laws and forward - looking information within the meaning of applicable Canadian securities laws (collec tively, “f

May 8, 2025 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 ☐ TRANSITION REPORT PURSUANT TO

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: 001-41655 NioCorp Developments

April 21, 2025 EX-1.1

Underwriting Agreement, dated as of April 17, 2025, by and between NioCorp Developments Ltd. and Maxim Group LLC

Exhibit 1.1 6,628,846 Common SHARES AND 1,063,462 PRE-FUNDED Warrants to purchase common shares NIOCORP DEVELOPMENTS LTD. UNDERWRITING AGREEMENT April 17, 2025 Maxim Group LLC As the Representative of the Several underwriters, if any, named in Schedule 1 hereto   c/o Maxim Group LLC 300 Park Avenue, 16th Floor New York, NY 10022   Ladies and Gentlemen:   The undersigned, NioCorp Developments Ltd.,

April 21, 2025 EX-99.1

NioCorp Announces Closing of Underwritten Public Offering, Including Partial Exercise of Underwriter’s Option, for Total Gross Proceeds of Approximately $20.8 Million

Exhibit 99.1 NioCorp Announces Closing of Underwritten Public Offering, Including Partial Exercise of Underwriter’s Option, for Total Gross Proceeds of Approximately $20.8 Million CENTENNIAL, CO / ACCESSWIRE / April 21, 2025 / NioCorp Developments Ltd. ("NioCorp" or the "Company") (NASDAQ:NB) today announced the closing of its previously announced underwritten public offering in the United States

April 21, 2025 EX-4.1

Form of April 2025 Pre-Funded Warrant

Exhibit 4.1 PRE-FUNDED COMMON SHARE PURCHASE WARRANT NIOCORP DEVELOPMENTS LTD.   Warrant Shares: [] Issuance Date: [], 2025   THIS PRE-FUNDED COMMON SHARE PURCHASE WARRANT (the “Warrant”) certifies that, for value received, [] or its assigns (the “Holder”) is entitled, upon the terms and subject to the limitations on exercise and the conditions hereinafter set forth, at any time on or after the da

April 21, 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): April 17, 2025 NioCorp Developmen

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 17, 2025 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 001-41655 (Comm

April 18, 2025 EX-FILING FEES

EX-FILING FEES

Exhibit 107 The prospectus supplement to which this exhibit is attached is a final prospectus for the related offering. The maximum aggregate offering price of that offering is $23,000,000.40.

April 18, 2025 424B3

6,628,846 Common Shares 1,063,462 Pre-Funded Warrants to Purchase 1,063,462 Common Shares

Filed Pursuant to Rule 424(b)(3) Registration No.: 333-280176 Prospectus Supplement (to Prospectus dated June 27, 2024) 6,628,846 Common Shares 1,063,462 Pre-Funded Warrants to Purchase 1,063,462 Common Shares We are offering 6,628,846 of our common shares, without par value (“Common Shares”) and, in lieu of Common Shares to certain investors that so choose, 1,063,462 pre-funded warrants to purcha

April 16, 2025 424B3

Subject to Completion Preliminary Prospectus Supplement, dated April 16, 2025

Filed Pursuant to Rule 424(b)(3) Registration No.: 333-280176 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are part of an effective registration statement filed with the Securities and Exchange Commission and are not offers to sell nor solicitations of offers to buy these securit

April 11, 2025 EX-99.1

NioCorp Provides Preliminary Financial Results for the Three and Nine Month Periods Ended March 31, 2025

Exhibit 99.1 NioCorp Provides Preliminary Financial Results for the Three and Nine Month Periods Ended March 31, 2025 CENTENNIAL, Colo. (April 11, 2025) – NioCorp Developments Ltd. (“NioCorp” or the “Company”) (NASDAQ:NB) today provided its preliminary financial results for the three- and nine-month periods ended March 31, 2025. Selected financial results expectations for the periods include: · Lo

April 11, 2025 8-K

Regulation FD Disclosure, 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 11, 2025 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 001-41655 (Comm

March 20, 2025 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): March 20, 2025 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 001-41655 (Comm

March 4, 2025 424B3

NioCorp Developments Ltd. 8,630,739 Common Shares offered by the Selling Shareholders

Filed Pursuant to Rule 424(b)(3) Registration No.: 333-285066 PROSPECTUS NioCorp Developments Ltd. 8,630,739 Common Shares offered by the Selling Shareholders This prospectus relates to the offer and sale from time to time by the selling shareholders identified herein (collectively, the “Selling Shareholders”) of up to an aggregate of 8,630,739 of our common shares, without par value (“Common Shar

February 28, 2025 CORRESP

February 28, 2025

February 28, 2025 VIA EDGAR Securities and Exchange Commission Division of Corporation Finance 100 F Street, NE Washington, DC 20549 Re: NioCorp Developments Ltd.

February 19, 2025 EX-23.14

Consent of Scott Honan, M.Sc., SME-RM, NioCorp

Exhibit 23.14 CONSENT OF QUALIFIED PERSON I, Scott Honan, M.Sc., SME-RM, consent to the public filing of Sections 13.7.5, 13.7.6, 13.7.7, 13.7.8, 13.7.15, 15.5, 15.6 and 22.7.1 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registra

February 19, 2025 EX-23.8

Consent of Adrian Brown Consultants Inc.

Exhibit 23.8 CONSENT OF QUALIFIED PERSON Adrian Brown Consultants Inc. hereby consents to the public filing of Sections 7.4.1, 7.4.2 and 13.2 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Statement on Form S-1 and any

February 19, 2025 EX-23.13

Consent of Metallurgy Concept Solutions

Exhibit 23.13 CONSENT OF QUALIFIED PERSON Metallurgy Concept Solutions LLC hereby consents to the public filing of Sections 10.3, 14.1.3, 14.2.3, 14.3.3, and 14.4.3 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Stateme

February 19, 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): February 14, 2025 NioCorp Develop

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, 2025 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 001-41655 (C

February 19, 2025 EX-23.9

Consent of Magemi Mining Inc.

Exhibit 23.9 CONSENT OF QUALIFIED PERSON Magemi Mining Inc. hereby consents to the public filing of Sections 10.1, 14.1.1, 14.2.1, 14.3.1, and 14.4.1 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Statement on Form S-1

February 19, 2025 EX-23.11

Consent of Olsson

Exhibit 23.11 CONSENT OF QUALIFIED PERSON Olsson hereby consents to the public filing of Sections 1.8, 17, 22.8 and 23.1.7 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Statement on Form S-1 and any and all amendments

February 19, 2025 EX-23.17

Consent of Wynand Marx, M.Eng., BBE Consulting

Exhibit 23.17 CONSENT OF QUALIFIED PERSON I, Wynand Marx, M.Eng., consent to the public filing of Section 13.6 (the “Covered Section”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Statement on Form S-1 and any and all amendments and supplemen

February 19, 2025 EX-FILING FEES

Filing Fee Table

Exhibit 107 Calculation of Filing Fee Tables Form S-1 (Form Type) NioCorp Developments Ltd.

February 19, 2025 EX-23.7

Consent of Tetra Tech

Exhibit 23.7 CONSENT OF QUALIFIED PERSON Tetra Tech hereby consents to the public filing of Sections 14.5, 15.1.1, 15.1.2, 15.2 to 15.4, 22.7 and 23.1.6 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Statement on Form S

February 19, 2025 EX-23.16

Consent of Mahmood Khwaja, P.E., CDM Smith

Exhibit 23.16 CONSENT OF QUALIFIED PERSON I, Mahmood Khwaja, P.E., consent to the public filing of Section 15.8 (the “Covered Section”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Statement on Form S-1 and any and all amendments and suppleme

February 19, 2025 EX-23.12

Consent of A2GC

Exhibit 23.12 CONSENT OF QUALIFIED PERSON A2GC hereby consents to the public filing of Sections 7.3, 13.1 and 23.1.3 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Statement on Form S-1 and any and all amendments and su

February 19, 2025 S-1

As filed with the Securities and Exchange Commission on February 19, 2025

As filed with the Securities and Exchange Commission on February 19, 2025 Registration No.

February 19, 2025 EX-23.10

Consent of L3 Process Development

Exhibit 23.10 CONSENT OF QUALIFIED PERSON L3 Process Development hereby consents to the public filing of Sections 10.2, 10.2.1 to 10.2.3, 14.1.2, 14.1.4, 14.2.2, 14.2.4, 14.3.2, 14.3.4, 14.4.2, 14.4.4, 22.4, 22.6, 23.1.2, and 23.1.5 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “T

February 19, 2025 EX-23.15

Consent of Cementation

Exhibit 23.15 CONSENT OF QUALIFIED PERSON Cementation hereby consents to the public filing of Sections 13.7.1, 13.7.2, 13.7.3, 13.7.4, 13.7.12, 13.7.9, 13.7.10, 13.7.11, 13.7.13, 13.7.14, 15.1.3, 15.1.4 and 23.1.8 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Sum

February 7, 2025 EX-4.9

Consent and Waiver, dated as of January 3, 2025, between NioCorp Developments Ltd. and YA II PN, Ltd.

Exhibit 4.9 CONSENT AND WAIVER THIS CONSENT AND WAIVER (this “Consent and Waiver”), dated as of January 3, 2025 to the Note (as defined below) is between NIOCORP DEVELOPMENTS LTD., a company organized under the laws of the Province of British Columbia, Canada, with principal executive offices located at 7000 South Yosemite Street, Suite 115, Centennial, Colorado 80112 (the “Company”), and YA II PN

February 7, 2025 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 December 31, 2024 ☐ TRANSITION REPORT PURSUANT

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 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: 001-41655 NioCorp Developme

February 3, 2025 DEF 14A

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

February 3, 2025 DEFA14A

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

January 31, 2025 EX-1.1

Underwriting Agreement, dated as of January 29, 2025, by and between NioCorp Developments Ltd. and Maxim Group LLC

Exhibit 1.1 2,577,320 Common SHARES, 2,577,320 SERIES A Warrants to purchase common shares AND 1,288,660 SERIES B Warrants to purchase common shares NIOCORP DEVELOPMENTS LTD. UNDERWRITING AGREEMENT January 29, 2025 Maxim Group LLC As the Representative of the Several underwriters, if any, named in Schedule 1 hereto   c/o Maxim Group LLC 300 Park Avenue, 16th Floor New York, NY 10022   Ladies and G

January 31, 2025 EX-99.1

NioCorp Announces Closing of $5.0 Million Underwritten Offering Priced At-The-Market Under Nasdaq Rules

Exhibit 99.1     NioCorp Announces Closing of $5.0 Million Underwritten Offering Priced At-The-Market Under Nasdaq Rules   CENTENNIAL, CO / ACCESSWIRE / January 31, 2025 / NioCorp Developments Ltd. ("NioCorp" or the "Company") (NASDAQ:NB) today announced the closing of its previously announced underwritten offering of 2,577,320 common shares, 2,577,320 Series A warrants to purchase up to 2,577,320

January 31, 2025 EX-FILING FEES

EX-FILING FEES

Exhibit 107 The prospectus supplement to which this exhibit is attached is a final prospectus for the related offering. The maximum aggregate offering price of that offering is $5,000,000.80.

January 31, 2025 EX-4.2

Form of January 2025 Series B Warrant

Exhibit 4.2 SERIES B COMMON SHARE PURCHASE WARRANT NIOCORP DEVELOPMENTS LTD.   Warrant Shares: [] Initial Exercise Date: January 31, 2025   THIS SERIES B COMMON SHARE PURCHASE WARRANT (the “Warrant”) certifies that, for value received, [] or its assigns (the “Holder”) is entitled, upon the terms and subject to the limitations on exercise and the conditions hereinafter set forth, at any time on or

January 31, 2025 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement, 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): January 29, 2025 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 001-41655 (Co

January 31, 2025 EX-4.1

Form of January 2025 Series A Warrant

Exhibit 4.1 SERIES A COMMON SHARE PURCHASE WARRANT NIOCORP DEVELOPMENTS LTD. Warrant Shares: [] Initial Exercise Date: January 31, 2025 THIS SERIES A COMMON SHARE PURCHASE WARRANT (the “Warrant”) certifies that, for value received, [] or its assigns (the “Holder”) is entitled, upon the terms and subject to the limitations on exercise and the conditions hereinafter set forth, at any time on or afte

January 31, 2025 424B3

  2,577,320 Common Shares 2,577,320 Series A Warrants to Purchase 2,577,320 Common Shares 1,288,660 Series B Warrants to Purchase 1,288,660 Common Shares

    Filed Pursuant to Rule 424(b)(3)     Registration No.: 333-280176         Prospectus Supplement (to Prospectus dated June 27, 2024)         2,577,320 Common Shares 2,577,320 Series A Warrants to Purchase 2,577,320 Common Shares 1,288,660 Series B Warrants to Purchase 1,288,660 Common Shares We are offering 2,577,320 of our common shares, without par value (“Common Shares”), 2,577,320 associate

January 13, 2025 8-K

Other Events, Shareholder Director Nominations

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 13, 2025 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 001-41655 (Co

January 10, 2025 8-K

Regulation FD Disclosure, 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): January 10, 2025 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 001-41655 (Co

January 10, 2025 EX-99.1

NioCorp Provides Preliminary Financial Results for the Three and Six Month Periods Ended December 31, 2024

Exhibit 99.1 NioCorp Provides Preliminary Financial Results for the Three and Six Month Periods Ended December 31, 2024 CENTENNIAL, Colo. (January 10, 2025) – NioCorp Developments Ltd. (“NioCorp” or the “Company”) (NASDAQ:NB) today provided its preliminary financial results for the three- and six-month periods ended December 31, 2024. Selected financial results expectations for the periods include

January 6, 2025 8-K

Entry into a Material Definitive Agreement, 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): January 3, 2025 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 001-41655 (Com

December 30, 2024 8-K

Other Events, Shareholder Director Nominations

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 27, 2024 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 001-41655 (C

November 13, 2024 EX-4.3

Consent and Waiver, dated as of October 3, 2024, between NioCorp Developments Ltd. and YA II PN, Ltd.

Exhibit 4.3 CONSENT AND WAIVER THIS CONSENT AND WAIVER (this “Consent and Waiver”), dated as of October 3, 2024 to the Note (as defined below) is between NIOCORP DEVELOPMENTS LTD., a company organized under the laws of the Province of British Columbia, Canada, with principal executive offices located at 7000 South Yosemite Street, Suite 115, Centennial, Colorado 80112 (the “Company”), and YA II PN

November 13, 2024 EX-4.9

Form of November 2024 Series A Private Warrant

Exhibit 4.9 UNLESS PERMITTED UNDER SECURITIES LEGISLATION, THE HOLDER OF THIS SECURITY MUST NOT TRADE THE SECURITY BEFORE MARCH 13, 2025. THE SECURITIES REPRESENTED HEREBY AND THE SECURITIES ISSUABLE UPON EXERCISE HEREOF HAVE NOT BEEN AND WILL NOT BE REGISTERED UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), OR UNDER ANY STATE SECURITIES LAWS. THE HOLDER HEREOF,

November 13, 2024 EX-4.10

Form of November 2024 Series B Private Warrant

Exhibit 4.10 UNLESS PERMITTED UNDER SECURITIES LEGISLATION, THE HOLDER OF THIS SECURITY MUST NOT TRADE THE SECURITY BEFORE MARCH 13, 2025. THE SECURITIES REPRESENTED HEREBY AND THE SECURITIES ISSUABLE UPON EXERCISE HEREOF HAVE NOT BEEN AND WILL NOT BE REGISTERED UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), OR UNDER ANY STATE SECURITIES LAWS. THE HOLDER HEREOF,

November 13, 2024 EX-4.4

Consent and Waiver, dated as of October 3, 2024, between NioCorp Developments Ltd. and Lind Global Fund II LP

Exhibit 4.4 CONSENT AND WAIVER THIS CONSENT AND WAIVER (this “Consent and Waiver”), dated as of October 3, 2024 to the Note (as defined below) is between NIOCORP DEVELOPMENTS LTD., a company organized under the laws of the Province of British Columbia, Canada, with principal executive offices located at 7000 South Yosemite Street, Suite 115, Centennial, Colorado 80112 (the “Company”), and LIND GLO

November 13, 2024 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 ☐ TRANSITION REPORT PURSUANT

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: 001-41655 NioCorp Developm

November 13, 2024 EX-4.8

Form of Subscription Agreement in respect of units issued in November 2024

Exhibit 4.8 THE SECURITIES TO WHICH THIS SUBSCRIPTION AGREEMENT RELATES AND THE SECURITIES ISSUABLE UPON EXERCISE THEREOF HAVE NOT BEEN AND WILL NOT BE REGISTERED UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE “1933 ACT”) OR ANY APPLICABLE STATE SECURITIES LAWS IN THE UNITED STATES AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD IN THE UNITED STATES (AS SUCH TERM IS DEFINED IN REGULA

November 8, 2024 8-K

Regulation FD Disclosure, 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 8, 2024 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (Co

November 8, 2024 EX-99.1

NioCorp Provides Preliminary Financial Results for the Three Months Ended September 30, 2024

Exhibit 99.1 NioCorp Provides Preliminary Financial Results for the Three Months Ended September 30, 2024 CENTENNIAL, Colo. (November 8, 2024) – NioCorp Developments Ltd. (“NioCorp” or the “Company”) (NASDAQ:NB) today provided its preliminary financial results for the three-month period ended September 30, 2024. Selected financial results expectations for the periods include: · Loss for the three-

November 5, 2024 424B3

1,592,356 Common Shares 1,592,356 Series A Warrants to Purchase 1,592,356 Common Shares 796,178 Series B Warrants to Purchase 796,178 Common Shares

Filed Pursuant to Rule 424(b)(3) Registration No.: 333-280176 Prospectus Supplement (to Prospectus dated June 27, 2024) 1,592,356 Common Shares 1,592,356 Series A Warrants to Purchase 1,592,356 Common Shares 796,178 Series B Warrants to Purchase 796,178 Common Shares We are offering 1,592,356 of our common shares, without par value (“Common Shares”), 1,592,356 associated warrants to purchase an ag

November 5, 2024 EX-99.1

NioCorp Announces Closing of Underwritten Public Offering

Exhibitg 99.1 NioCorp Announces Closing of Underwritten Public Offering CENTENNIAL, CO / ACCESSWIRE / November 5, 2024 / NioCorp Developments Ltd. ("NioCorp" or the "Company") (NASDAQ:NB) today announced the closing of its previously announced underwritten public offering in the United States (the “Registered Offering”), the first of two concurrent offerings expected to raise a total of approximat

November 5, 2024 EX-4.1

Warrant Agency Agreement, dated as of November 5, 2024, by and between NioCorp Developments Ltd., Computershare Inc. and Computershare Trust Company, N.A.

Exhibit 4.1 WARRANT AGENCY AGREEMENT   WARRANT AGENCY AGREEMENT, dated as of November 5, 2024 (“Agreement”), by and between NioCorp Developments Ltd., a company incorporated under the laws of the Province of British Columbia, Canada (the “Company”), and Computershare Inc., a Delaware corporation (“Computershare”), and its affiliate, Computershare Trust Company, N.A., a federally chartered trust co

November 5, 2024 EX-4.2

Form of November 2024 Series A Public Warrant

Exhibit 4.2 SERIES A COMMON SHARE PURCHASE WARRANT NIOCORP DEVELOPMENTS LTD. Warrant Shares: Initial Exercise Date: November 5, 2024 THIS SERIES A COMMON SHARE PURCHASE WARRANT (the “Warrant”) certifies that, for value received, or its assigns (the “Holder”) is entitled, upon the terms and subject to the limitations on exercise and the conditions hereinafter set forth, at any time on or after the

November 5, 2024 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 5, 2024 NioCorp Developm

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 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 001-41655 (Co

November 5, 2024 EX-FILING FEES

EX-FILING FEES

Exhibit 107 The prospectus supplement to which this exhibit is attached is a final prospectus for the related offering. The maximum aggregate offering price of that offering is $2,874,999.

November 5, 2024 EX-1.1

Underwriting Agreement, dated as of November 3, 2024, by and between NioCorp Developments Ltd. and Maxim Group LLC

Exhibit 1.1 1,592,356 Common SHARES, 1,592,356 SERIES A Warrants to purchase common shares AND 796,178 SERIES B Warrants to purchase common shares NIOCORP DEVELOPMENTS LTD. UNDERWRITING AGREEMENT November 3, 2024 Maxim Group LLC As the Representative of the Several underwriters, if any, named in Schedule 1 hereto c/o Maxim Group LLC 300 Park Avenue, 16th Floor New York, NY 10022   Ladies and Gentl

November 5, 2024 EX-4.3

Form of November 2024 Series B Public Warrant

Exhibit 4.3 SERIES B COMMON SHARE PURCHASE WARRANT NIOCORP DEVELOPMENTS LTD.   Warrant Shares: Issuance Date: November 5, 2024 Initial Exercise Date: May 6, 2025 THIS SERIES B COMMON SHARE PURCHASE WARRANT (the “Warrant”) certifies that, for value received, or its assigns (the “Holder”) is entitled, upon the terms and subject to the limitations on exercise and the conditions hereinafter set forth,

November 1, 2024 424B3

Subject to Completion Preliminary Prospectus Supplement, dated November 1, 2024

Filed Pursuant to Rule 424(b)(3) Registration No.: 333-280176 The information in this preliminary prospectus supplement is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are part of an effective registration statement filed with the Securities and Exchange Commission and are not offers to sell nor solicitations of offers to buy these securit

October 3, 2024 8-K

Entry into a Material Definitive Agreement, 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): October 3, 2024 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 001-41655 (Com

September 23, 2024 EX-4.30

Consent and Waiver, dated as of September 4, 2024, between NioCorp Developments Ltd. and Lind Global Fund II LP

Exhibit 4.30 CONSENT AND WAIVER THIS CONSENT AND WAIVER (this “Consent and Waiver”), dated as of September 4, 2024 to the Note (as defined below) is between NIOCORP DEVELOPMENTS LTD., a company organized under the laws of the Province of British Columbia, Canada, with principal executive offices located at 7000 South Yosemite Street, Suite 115, Centennial, Colorado 80112 (the “Company”), and LIND

September 23, 2024 EX-97.1

Compensation Clawback Policy

Exhibit 97.1 NIOCORP DEVELOPMENTS LTD. Compensation Clawback Policy Effective November 9, 2023 Purpose As required pursuant to the listing standards of the Nasdaq Stock Market LLC (the “Stock Exchange”), Section 10D of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and Rule 10D-1 under the Exchange Act, the Board of Directors (the “Board”) of NioCorp Developments Ltd. (the “

September 23, 2024 EX-23.15

Consent of Mahmood Khwaja, P.E., CDM Smith

Exhibit 23.15 CONSENT OF QUALIFIED PERSON I, Mahmood Khwaja, P.E., consent to the public filing of Section 15.8 (the “Covered Section”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to the Annual Report on Form 10-K for the fiscal year ended June 30, 2024 (the “Fo

September 23, 2024 EX-23.7

Consent of Adrian Brown Consultants Inc.

Exhibit 23.7 CONSENT OF QUALIFIED PERSON Adrian Brown Consultants Inc. hereby consents to the public filing of Sections 7.4.1, 7.4.2 and 13.2 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to the Annual Report on Form 10-K for the fiscal ye

September 23, 2024 EX-23.10

Consent of Olsson

Exhibit 23.10 CONSENT OF QUALIFIED PERSON Olsson hereby consents to the public filing of Sections 1.8, 17, 22.8 and 23.1.7 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to the Annual Report on Form 10-K for the fiscal year ended June 30, 2

September 23, 2024 EX-23.9

Consent of L3 Process Development

Exhibit 23.9 CONSENT OF QUALIFIED PERSON L3 Process Development hereby consents to the public filing of Sections 10.2, 10.2.1 to 10.2.3, 14.1.2, 14.1.4, 14.2.2, 14.2.4, 14.3.2, 14.3.4, 14.4.2, 14.4.4, 22.4, 22.6, 23.1.2, and 23.1.5 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Te

September 23, 2024 EX-23.11

Consent of A2GC

Exhibit 23.11 CONSENT OF QUALIFIED PERSON A2GC hereby consents to the public filing of Sections 7.3, 13.1 and 23.1.3 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to the Annual Report on Form 10-K for the fiscal year ended June 30, 2024 (t

September 23, 2024 EX-21.1

Subsidiaries of NioCorp Developments Ltd.

Exhibit 21.1 List of Subsidiaries of NioCorp Developments Ltd. (the “Company”) Name State/Province of Formation Ownership 0896800 B.C. Ltd. (“0896800”) British Columbia 100% Elk Creek Resources Corp. Delaware 79.7%(1) NioCorp Technologies Limited United Kingdom 100% (1) Represents 100% of Class A common stock owned by 0896800, and 4,282,116 Vested Shares and 3,391,596 Earnout Shares (each as defin

September 23, 2024 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D. C. 20549

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 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: 001-41655 NioCorp Developme

September 23, 2024 EX-23.8

Consent of Magemi Mining Inc.

Exhibit 23.8 CONSENT OF QUALIFIED PERSON Magemi Mining Inc. hereby consents to the public filing of Sections 10.1, 14.1.1, 14.2.1, 14.3.1, and 14.4.1 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to the Annual Report on Form 10-K for the f

September 23, 2024 EX-23.14

Consent of Cementation

Exhibit 23.14 CONSENT OF QUALIFIED PERSON Cementation hereby consents to the public filing of Sections 13.7.1, 13.7.2, 13.7.3, 13.7.4, 13.7.12, 13.7.9, 13.7.10, 13.7.11, 13.7.13, 13.7.14, 15.1.3, 15.1.4 and 23.1.8 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Sum

September 23, 2024 EX-23.16

Consent of Wynand Marx, M.Eng., BBE Consulting

Exhibit 23.16 CONSENT OF QUALIFIED PERSON I, Wynand Marx, M.Eng., consent to the public filing of Section 13.6 (the “Covered Section”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to the Annual Report on Form 10-K for the fiscal year ended June 30, 2024 (the “For

September 23, 2024 EX-19.1

NioCorp Developments Ltd. Insider Trading Policy

Exhibit 19.1 NIOCORP DEVELOPMENTS LTD. INSIDER TRADING POLICY (Adopted Effective as of March 17, 2023, Revised March 28, 2024) PURPOSE OF THE POLICY. This Insider Trading Policy (the “Policy”) provides guidelines with respect to transactions in the securities of NioCorp Developments Ltd. (the “Company”) and the handling of confidential information about the Company and the companies with which the

September 23, 2024 EX-23.13

Consent of Scott Honan, M.Sc., SME-RM, NioCorp

Exhibit 23.13 CONSENT OF QUALIFIED PERSON I, Scott Honan, M.Sc., SME-RM, consent to the public filing of Sections 13.7.5, 13.7.6, 13.7.7, 13.7.8, 13.7.15, 15.5, 15.6 and 22.7.1 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to the Annual Re

September 23, 2024 EX-4.33

Description of Securities

Exhibit 4.33 DESCRIPTION OF Securities Common Shares The authorized capital of NioCorp Developments Ltd., a British Columbia corporation (the “Company”), consists of an unlimited number of common shares, without par value, of the Company (the “Common Shares”). The holders of Common Shares are entitled to receive notice of and attend all meetings of shareholders, with each Common Share held entitli

September 23, 2024 EX-23.12

Consent of Metallurgy Concept Solutions

Exhibit 23.12 CONSENT OF QUALIFIED PERSON Metallurgy Concept Solutions LLC hereby consents to the public filing of Sections 10.3, 14.1.3, 14.2.3, 14.3.3, and 14.4.3 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to the Annual Report on Form

September 23, 2024 EX-4.5

Form of Lind Contingent Consent Warrants

Exhibit 4.5 THE SECURITIES REPRESENTED HEREBY AND THE SECURITIES ISSUABLE UPON EXERCISE HEREOF HAVE NOT BEEN AND WILL NOT BE REGISTERED UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE “U.S. SECURITIES ACT”) OR U.S. STATE SECURITIES LAWS. THE HOLDER HEREOF, BY PURCHASING SUCH SECURITIES, AGREES FOR THE BENEFIT OF THE CORPORATION THAT SUCH SECURITIES MAY BE OFFERED, SOLD, PLEDGED OR

September 23, 2024 EX-4.29

Consent and Waiver, dated as of September 4, 2024, between NioCorp Developments Ltd. and YA II PN, Ltd.

Exhibit 4.29 CONSENT AND WAIVER THIS CONSENT AND WAIVER (this “Consent and Waiver”), dated as of September 4, 2024 to the Note (as defined below) is between NIOCORP DEVELOPMENTS LTD., a company organized under the laws of the Province of British Columbia, Canada, with principal executive offices located at 7000 South Yosemite Street, Suite 115, Centennial, Colorado 80112 (the “Company”), and YA II

September 11, 2024 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): September 11, 2024 NioCorp Develo

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 11, 2024 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (

September 11, 2024 EX-10.1

Loan Agreement, dated as of September 11, 2024, between NioCorp Developments Ltd. and Mark Smith.

Exhibit 10.1 LOAN AGREEMENT THIS AGREEMENT made effective as of the 11th day of September, 2024 (the “Effective Date”). BETWEEN: NioCorp Developments Ltd., a corporation incorporated under the laws of British Columbia with an office at 7000 South Yosemite Street, Suite 115, Centennial, CO, USA 80112 (the “Borrower”) OF THE FIRST PART AND: Mark Smith, businessman of Highlands Ranch, CO, USA 80126 (

September 11, 2024 EX-10.2

Security Agreement, dated as of September 11, 2024, between NioCorp Developments Ltd. and Mark Smith.

Exhibit 10.2 THIS SECURITY AGREEMENT made September 11, 2024 FROM: NIOCORP DEVELOPMENTS LTD., a corporation incorporated under the laws of British Columbia with an office at 7000 South Yosemite Street, Suite 115, Centennial, CO, USA 80112 (the "Debtor") TO: MARK SMITH, businessman of Highlands Ranch, CO, USA 80126 (the "Secured Party") FOR VALUE RECEIVED, the Debtor covenants, agrees, warrants, re

September 4, 2024 8-K

Entry into a Material Definitive Agreement, 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): September 4, 2024 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (C

August 27, 2024 EX-99.1

NioCorp Provides Preliminary Financial Results for the Fiscal Year Ended June 30, 2024

Exhibit 99.1 NioCorp Provides Preliminary Financial Results for the Fiscal Year Ended June 30, 2024 CENTENNIAL, Colo. (August 26, 2024) – NioCorp Developments Ltd. (“NioCorp” or the “Company”) (NASDAQ:NB) today provided its preliminary financial results for the fiscal year ended June 30, 2024. Selected financial results expectations for the periods include: • Loss for the fiscal year ended June 30

August 27, 2024 8-K

Regulation FD Disclosure, 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 26, 2024 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (Com

June 25, 2024 CORRESP

June 25, 2024

June 25, 2024 VIA EDGAR Securities and Exchange Commission Division of Corporation Finance 100 F Street, NE Washington, DC 20549 Re: NioCorp Developments Ltd.

June 24, 2024 EX-4.1

Form of Warrants

Exhibit 4.1 THE WARRANTS EVIDENCED HEREBY ARE EXERCISABLE ON OR BEFORE 4:30 P.M. (VANCOUVER TIME) ON June 24, 2026, AFTER WHICH TIME THE WARRANTS EVIDENCED HEREBY SHALL BE DEEMED TO BE VOID AND OF NO FURTHER FORCE OR EFFECT. [For all Warrants, include the following legend until such time as it is no longer required in accordance with applicable Canadian securities laws:] “UNLESS PERMITTED UNDER SE

June 24, 2024 EX-4.2

Form of Subscription Agreement

Exhibit 4.2 THE SECURITIES TO WHICH THIS SUBSCRIPTION AGREEMENT RELATES AND THE SECURITIES ISSUABLE UPON EXERCISE THEREOF HAVE NOT BEEN AND WILL NOT BE REGISTERED UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE “1933 ACT”) OR ANY APPLICABLE STATE SECURITIES LAWS IN THE UNITED STATES AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD IN THE UNITED STATES (AS SUCH TERM IS DEFINED IN REGULA

June 24, 2024 EX-99.1

NioCorp Announces Closing of Private Placement for Gross Proceeds of US$0.6 Million

Exhibit 99.1 NioCorp Announces Closing of Private Placement for Gross Proceeds of US$0.6 Million CENTENNIAL, Colo. June 24, 2024— NioCorp Developments Ltd. (NASDAQ: NB) (“NioCorp” the “Company”), is pleased to announce that it has closed a non-brokered private placement (the “Private Placement”) of 315,000 units of the Company at a price of USD$1.91 per unit, for aggregate gross proceeds to the Co

June 24, 2024 8-K

Entry into a Material Definitive Agreement, Unregistered Sales of Equity Securities, 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): June 24, 2024 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (Commi

June 13, 2024 EX-23.10

Consent of Magemi Mining Inc.

Exhibit 23.10 CONSENT OF QUALIFIED PERSON Magemi Mining Inc. hereby consents to the public filing of Sections 10.1, 14.1.1, 14.2.1, 14.3.1, and 14.4.1 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Statement on Form S-3

June 13, 2024 EX-23.13

Consent of A2GC

Exhibit 23.13 CONSENT OF QUALIFIED PERSON A2GC hereby consents to the public filing of Sections 7.3, 13.1 and 23.1.3 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Statement on Form S-3 and any and all amendments and su

June 13, 2024 EX-23.9

Consent of Adrian Brown Consultants Inc.

Exhibit 23.9 CONSENT OF QUALIFIED PERSON  Adrian Brown Consultants Inc. hereby consents to the public filing of Sections 7.4.1, 7.4.2 and 13.2 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Statement on Form S-3 and any

June 13, 2024 EX-23.12

Consent of Olsson

  Exhibit 23.12     CONSENT OF QUALIFIED PERSON Olsson hereby consents to the public filing of Sections 1.8, 17, 22.8 and 23.1.7 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Statement on Form S-3 and any and all amend

June 13, 2024 EX-23.16

Consent of Cementation

Exhibit 23.16    CONSENT OF QUALIFIED PERSON Cementation hereby consents to the public filing of Sections 13.7.1, 13.7.2, 13.7.3, 13.7.4, 13.7.12, 13.7.9, 13.7.10, 13.7.11, 13.7.13, 13.7.14, 15.1.3, 15.1.4 and 23.1.8 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report

June 13, 2024 EX-23.8

Consent of Tetra Tech

Exhibit 23.8 CONSENT OF QUALIFIED PERSON Tetra Tech hereby consents to the public filing of Sections 14.5, 15.1.1, 15.1.2, 15.2 to 15.4, 22.7 and 23.1.6 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Statement on Form S

June 13, 2024 S-3

As filed with the Securities and Exchange Commission on June 13, 2024

As filed with the Securities and Exchange Commission on June 13, 2024 Registration No.

June 13, 2024 EX-23.14

Consent of Metallurgy Concept Solutions

Exhibit 23.14 CONSENT OF QUALIFIED PERSON Metallurgy Concept Solutions LLC hereby consents to the public filing of Sections 10.3, 14.1.3, 14.2.3, 14.3.3, and 14.4.3 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Stateme

June 13, 2024 EX-23.11

Consent of L3 Process Development

Exhibit 23.11 CONSENT OF QUALIFIED PERSON L3 Process Development hereby consents to the public filing of Sections 10.2, 10.2.1 to 10.2.3, 14.1.2, 14.1.4, 14.2.2, 14.2.4, 14.3.2, 14.3.4, 14.4.2, 14.4.4, 22.4, 22.6, 23.1.2, and 23.1.5 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “T

June 13, 2024 EX-23.18

Consent of Wynand Marx, M.Eng., BBE Consulting

Exhibit 23.18    CONSENT OF QUALIFIED PERSON I, Wynand Marx, M.Eng., consent to the public filing of Section 13.6 (the “Covered Section”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Statement on Form S-3 and any and all amendments and supple

June 13, 2024 EX-23.7

Consent of Optimize Group Inc.

Exhibit 23.7 CONSENT OF QUALIFIED PERSON Optimize Group Inc. hereby consents to the public filing of Sections 1.7, 12, 13.3 to 13.5, 15.7, 22.5 and 23.1.4 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Statement on Form

June 13, 2024 EX-23.17

Consent of Mahmood Khwaja, P.E., CDM Smith

Exhibit 23.17       CONSENT OF QUALIFIED PERSON   I, Mahmood Khwaja, P.E., consent to the public filing of Section 15.8 (the “Covered Section”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Statement on Form S-3 and any and all amendments and

June 13, 2024 EX-FILING FEES

Filing Fee Table

Exhibit 107 Calculation of Filing Fee Tables Form S-3 (Form Type) NioCorp Developments Ltd.

June 13, 2024 EX-23.15

Consent of Scott Honan, M.Sc., SME-RM, NioCorp

Exhibit 23.15    CONSENT OF QUALIFIED PERSON I, Scott Honan, M.Sc., SME-RM, consent to the public filing of Sections 13.7.5, 13.7.6, 13.7.7, 13.7.8, 13.7.15, 15.5, 15.6 and 22.7.1 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Regis

May 31, 2024 424B3

NioCorp Developments Ltd. 4,834,066 Common Shares offered by the Selling Shareholders

Filed Pursuant to Rule 424(b)(3) Registration No.: 333-279429 PROSPECTUS NioCorp Developments Ltd. 4,834,066 Common Shares offered by the Selling Shareholders This prospectus relates to the offer and sale from time to time by the selling shareholders identified herein (collectively, the “Selling Shareholders”) of up to an aggregate of 4,834,066 of our common shares, without par value (“Common Shar

May 28, 2024 CORRESP

May 28, 2024

May 28, 2024 VIA EDGAR Securities and Exchange Commission Division of Corporation Finance 100 F Street, NE Washington, DC 20549 Re: NioCorp Developments Ltd.

May 15, 2024 EX-23.9

Consent of Magemi Mining Inc.

Exhibit 23.9 CONSENT OF QUALIFIED PERSON Magemi Mining Inc. hereby consents to the public filing of Sections 10.1, 14.1.1, 14.2.1, 14.3.1, and 14.4.1 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Statement on Form S-1

May 15, 2024 EX-23.11

Consent of Olsson

Exhibit 23.11 CONSENT OF QUALIFIED PERSON Olsson hereby consents to the public filing of Sections 1.8, 17, 22.8 and 23.1.7 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Statement on Form S-1 and any and all amendments

May 15, 2024 S-1

As filed with the Securities and Exchange Commission on May 15, 2024

As filed with the Securities and Exchange Commission on May 15, 2024 Registration No.

May 15, 2024 EX-23.12

Consent of A2GC

Exhibit 23.12 CONSENT OF QUALIFIED PERSON A2GC hereby consents to the public filing of Sections 7.3, 13.1 and 23.1.3 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Statement on Form S-1 and any and all amendments and su

May 15, 2024 EX-23.17

Consent of Wynand Marx, M.Eng., BBE Consulting

Exhibit 23.17 CONSENT OF QUALIFIED PERSON I, Wynand Marx, M.Eng., consent to the public filing of Section 13.6 (the “Covered Section”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Statement on Form S-1 and any and all amendments and supplemen

May 15, 2024 EX-23.13

Consent of Metallurgy Concept Solutions

Exhibit 23.13 CONSENT OF QUALIFIED PERSON Metallurgy Concept Solutions LLC hereby consents to the public filing of Sections 10.3, 14.1.3, 14.2.3, 14.3.3, and 14.4.3 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Stateme

May 15, 2024 EX-23.14

Consent of Scott Honan, M.Sc., SME-RM, NioCorp

Exhibit 23.14 CONSENT OF QUALIFIED PERSON I, Scott Honan, M.Sc., SME-RM, consent to the public filing of Sections 13.7.5, 13.7.6, 13.7.7, 13.7.8, 13.7.15, 15.5, 15.6 and 22.7.1 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registra

May 15, 2024 EX-23.10

Consent of L3 Process Development

Exhibit 23.10 CONSENT OF QUALIFIED PERSON L3 Process Development hereby consents to the public filing of Sections 10.2, 10.2.1 to 10.2.3, 14.1.2, 14.1.4, 14.2.2, 14.2.4, 14.3.2, 14.3.4, 14.4.2, 14.4.4, 22.4, 22.6, 23.1.2, and 23.1.5 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “T

May 15, 2024 EX-23.7

Consent of Tetra Tech

Exhibit 23.7 CONSENT OF QUALIFIED PERSON Tetra Tech hereby consents to the public filing of Sections 14.5, 15.1.1, 15.1.2, 15.2 to 15.4, 22.7 and 23.1.6 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Statement on Form S

May 15, 2024 EX-FILING FEES

Filing Fee Table

Exhibit 107 Calculation of Filing Fee Tables Form S-1 (Form Type) NioCorp Developments Ltd.

May 15, 2024 EX-23.16

Consent of Mahmood Khwaja, P.E., CDM Smith

Exhibit 23.16 CONSENT OF QUALIFIED PERSON I, Mahmood Khwaja, P.E., consent to the public filing of Section 15.8 (the “Covered Section”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Statement on Form S-1 and any and all amendments and suppleme

May 15, 2024 EX-23.15

Consent of Everett Bird, PE, Cementation

Exhibit 23.15 CONSENT OF QUALIFIED PERSON Cementation hereby consents to the public filing of Sections 13.7.1, 13.7.2, 13.7.3, 13.7.4, 13.7.12, 13.7.9, 13.7.10, 13.7.11, 13.7.13, 13.7.14, 15.1.3, 15.1.4 and 23.1.8 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Sum

May 15, 2024 EX-23.8

Consent of Adrian Brown Consultants Inc.

Exhibit 23.8 CONSENT OF QUALIFIED PERSON Adrian Brown Consultants Inc. hereby consents to the public filing of Sections 7.4.1, 7.4.2 and 13.2 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Statement on Form S-1 and any

May 3, 2024 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, 2024 NioCorp Developments

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, 2024 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 001-41655 (Commiss

May 3, 2024 EX-10.1

Amendment No. 1 to Standby Equity Purchase Agreement, dated as of May 3, 2024, by and between NioCorp Developments Ltd. and YA II PN, Ltd.

Exhibit 10.1 AMENDMENT NO. 1 TO STANDBY EQUITY PURCHASE AGREEMENT THIS AMENDMENT NO. 1 (this “Amendment”), dated as of May 3, 2024 to the Standby Equity Purchase Agreement (as defined below) is between NIOCORP DEVELOPMENTS LTD., a company organized under the laws of the Province of British Columbia, Canada, with principal executive offices located at 7000 South Yosemite Street, Suite 115, Centenni

May 2, 2024 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 ☐ TRANSITION REPORT PURSUANT TO

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: 001-41655 NioCorp Developments

April 17, 2024 EX-99.1

NioCorp to Voluntarily Delist from the TSX in Favor of its Current Nasdaq Listing

Exhibit 99.1 NioCorp to Voluntarily Delist from the TSX in Favor of its Current Nasdaq Listing CENTENNIAL, Colo. – April 17, 2024 –NioCorp Developments Ltd. ("NioCorp" or the "Company") (NASDAQ:NB) (TSX:NB) announces that its board of directors (the “Board”) has approved the voluntary delisting of the Company’s common shares from the Toronto Stock Exchange (the “TSX”) (the “Delisting”). Subject to

April 17, 2024 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): April 17, 2024 NioCorp Developmen

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 17, 2024 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (Comm

April 12, 2024 EX-10.1

Securities Purchase Agreement, dated as of April 11, 2024, by and between NioCorp Developments Ltd. and each of YA II PN, Ltd. and Lind Global Fund II LP

Exhibit 10.1 SECURITIES PURCHASE AGREEMENT THIS SECURITIES PURCHASE AGREEMENT (as amended, supplemented or otherwise modified from time to time, this “Agreement”), dated as of April 11, 2024, is between NIOCORP DEVELOPMENTS LTD., a company organized under the laws of the Province of British Columbia, Canada, with principal executive offices located at 7000 South Yosemite Street, Suite 115, Centenn

April 12, 2024 EX-10.2

Global Guaranty Agreement, dated as of April 11, 2024, by Elk Creek Resources Corporation and 0896800 B.C. Ltd.

Exhibit 10.2 GLOBAL GUARANTY AGREEMENT This Guaranty is made as of April 11, 2024 by ELK CREEK RESOURCES CORPORATION, a Delaware corporation (“ECRC”), and 0896800 B.C. LTD., a company organized under the laws of the Province of British Columbia, Canada (“0896800” and together with ECRC, the “Guarantors”), in favor of YA II PN, LTD. (“YA II”) and LIND GLOBAL FUND II LP (“Lind” and collectively with

April 12, 2024 EX-10.3

Registration Rights Agreement, dated as of April 11, 2024, by and between NioCorp Developments Ltd. and each of YA II PN, Ltd. and Lind Global Fund II LP

Exhibit 10.3 REGISTRATION RIGHTS AGREEMENT THIS REGISTRATION RIGHTS AGREEMENT (this “Agreement”), dated as of April 11, 2024, is made and entered into by and among NIOCORP DEVELOPMENTS LTD., a company incorporated under the laws of the Province of British Columbia, Canada (the “Company”), YA II PN, LTD., a Cayman Islands exempt limited partnership (“Yorkville”) and LIND GLOBAL FUND II LP, a Delawa

April 12, 2024 8-K

Entry into a Material Definitive Agreement, Unregistered Sales of Equity Securities, 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): April 11, 2024 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (Comm

April 12, 2024 EX-99.1

NioCorp Announces Closing of Financing Agreement

Exhibit 99.1 NioCorp Announces Closing of Financing Agreement CENTENNIAL, Colo., April 12, 2024 — NioCorp Developments Ltd. ("NioCorp" or the "Company") (Nasdaq: NB; TSX: NB) today announced that it has closed (the “Closing”) a private placement (the “Private Placement”) of US$8,000,000 aggregate principal amount of unsecured notes of NioCorp (the “Notes”). Pursuant to the terms of the Notes, subj

March 14, 2024 EX-99.1

NioCorp Completes Issuance and Sale of 85,000 Shares under the Standby Equity Purchase Agreement

Exhibit 99.1 NioCorp Completes Issuance and Sale of 85,000 Shares under the Standby Equity Purchase Agreement CENTENNIAL, Colo. (March 14, 2024) – NioCorp Developments Ltd. ("NioCorp" or the "Company") (Nasdaq: NB; TSX: NB) today issued and sold 85,000 shares (the “Advance Shares”) of the Company’s common shares, without par value (the “Common Shares”), upon settlement of the previously announced

March 14, 2024 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 14, 2024 NioCorp Developmen

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 14, 2024 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (Comm

March 12, 2024 EX-99.1

NioCorp Delivers Advance Notice under the Standby Equity Purchase Agreement

Exhibit 99.1 NioCorp Delivers Advance Notice under the Standby Equity Purchase Agreement CENTENNIAL, Colo. (March 12, 2024) – NioCorp Developments Ltd. ("NioCorp" or the "Company") (Nasdaq: NB; I TSX: NB) today announced that it has delivered a written notice (the “Advance Notice”) pursuant to the previously announced Standby Equity Purchase Agreement, dated January 26, 2023 (the “Standby Equity P

March 12, 2024 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): March 12, 2024 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (Comm

March 7, 2024 EX-99.1

NioCorp Completes Issuance and Sale of 82,500 Shares under the Standby Equity Purchase Agreement

Exhibit 99.1 NioCorp Completes Issuance and Sale of 82,500 Shares under the Standby Equity Purchase Agreement CENTENNIAL, Colo. (March 7, 2024) – NioCorp Developments Ltd. ("NioCorp" or the "Company") (Nasdaq: NB; TSX: NB) today issued and sold 82,500 shares (the “Advance Shares”) of the Company’s common shares, without par value (the “Common Shares”), upon settlement of the previously announced A

March 7, 2024 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 7, 2024 NioCorp Development

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, 2024 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (Commi

March 5, 2024 EX-99.1

NioCorp Delivers Advance Notice under the Standby Equity Purchase Agreement

Exhibit 99.1 NioCorp Delivers Advance Notice under the Standby Equity Purchase Agreement CENTENNIAL, Colo. (March 5, 2024) – NioCorp Developments Ltd. ("NioCorp" or the "Company") (Nasdaq: NB; I TSX: NB) today announced that it has delivered a written notice (the “Advance Notice”) pursuant to the previously announced Standby Equity Purchase Agreement, dated January 26, 2023 (the “Standby Equity Pu

March 5, 2024 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 5, 2024 NioCorp Development

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 5, 2024 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (Commi

February 28, 2024 EX-99.2

NioCorp Completes Issuance and Sale of 75,000 Shares under the Standby Equity Purchase Agreement

Exhibit 99.2 NioCorp Completes Issuance and Sale of 75,000 Shares under the Standby Equity Purchase Agreement CENTENNIAL, Colo. (February 28, 2024) – NioCorp Developments Ltd. ("NioCorp" or the "Company") (Nasdaq: NB; TSX: NB) today issued and sold 75,000 shares (the “Advance Shares”) of the Company’s common shares, without par value (the “Common Shares”), upon settlement of the previously announc

February 28, 2024 EX-99.1

NioCorp Delivers Advance Notice under the Standby Equity Purchase Agreement

Exhibit 99.1 NioCorp Delivers Advance Notice under the Standby Equity Purchase Agreement CENTENNIAL, Colo. (February 26, 2024) – NioCorp Developments Ltd. ("NioCorp" or the "Company") (Nasdaq: NB; I TSX: NB) today announced that it has delivered a written notice (the “Advance Notice”) pursuant to the previously announced Standby Equity Purchase Agreement, dated January 26, 2023 (the “Standby Equit

February 28, 2024 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): February 28, 2024 NioCorp Develop

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 28, 2024 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (C

February 13, 2024 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 December 31, 2023 ☐ TRANSITION REPORT PURSUANT

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 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: 001-41655 NioCorp Developme

January 22, 2024 EX-10.1

NioCorp Developments Ltd. Long Term Incentive Plan, as amended

Exhibit 10.1 NIOCORP DEVELOPMENTS LTD. LONG TERM INCENTIVE PLAN Approved by the Board of Directors on September 29, 2017, as amended on September 24, 2020 and as further amended on December 4, 2023, and by the Corporation’s shareholders on November 9, 2017, as amended on November 4, 2020 and as further amended on January 19, 2024. PART I – GENERAL PROVISIONS 1. PREAMBLE AND DEFINITIONS 1.1 Title.

January 22, 2024 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 19, 2024 NioCorp Developm

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 19, 2024 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (Co

January 17, 2024 SC 13D

CA:NB / NioCorp Developments Ltd. / Kehler Dean C - SCHEDULE 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. )* NioCorp Developments Ltd. (Name of Issuer) Common Shares, without par value (Title of Class of Securities) 654484609 (CUSIP Number) Dean Kehler c/o Trimaran Capital 1325 Avenue of the Americas 28th Floor New York, NY 10019 (212) 616-3730 (Name, Address an

December 20, 2023 EX-4.2

Form of Subscription Agreement

Exhibit 4.2 THE SECURITIES TO WHICH THIS SUBSCRIPTION AGREEMENT RELATES AND THE SECURITIES ISSUABLE UPON EXERCISE THEREOF HAVE NOT BEEN AND WILL NOT BE REGISTERED UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE “1933 ACT”) OR ANY APPLICABLE STATE SECURITIES LAWS IN THE UNITED STATES AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD IN THE UNITED STATES (AS SUCH TERM IS DEFINED IN REGULA

December 20, 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): December 14, 2023 NioCorp Develop

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 14, 2023 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (C

December 20, 2023 EX-4.1

Form of Warrants

Exhibit 4.1 THE WARRANTS EVIDENCED HEREBY ARE EXERCISABLE ON OR BEFORE 4:30 P.M. (VANCOUVER TIME) ON DECEMBER 22, 2025, AFTER WHICH TIME THE WARRANTS EVIDENCED HEREBY SHALL BE DEEMED TO BE VOID AND OF NO FURTHER FORCE OR EFFECT. [For all Warrants, include the following legend until such time as it is no longer required in accordance with applicable Canadian securities laws:] “UNLESS PERMITTED UNDE

December 18, 2023 SC 13G

CA:NB / NioCorp Developments Ltd. / Bloom Jay R - 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. )* NioCorp Developments Ltd. (Name of Issuer) Common Shares, without par value (Title of Class of Securities) 654484609 (CUSIP Number) March 17, 2023 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule purs

December 18, 2023 EX-99.1

JOINT FILING AGREEMENT

Exhibit 1 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the undersigned agree to the joint filing on behalf of each of them of a Statement on Schedule 13G (including any and all amendments thereto) with respect to the Common Shares, without par value, of Niocorp Developments Ltd.

December 14, 2023 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): December 14, 2023 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (C

December 14, 2023 EX-99.1

NioCorp Announces Private Placement for Gross Proceeds of US$1 Million Subscribers in the Private Placement Include Certain NioCorp Officers and Directors

Exhibit 99.1 NioCorp Announces Private Placement for Gross Proceeds of US$1 Million Subscribers in the Private Placement Include Certain NioCorp Officers and Directors CENTENNIAL, Colo. (December 14, 2023) – NioCorp Developments Ltd. (“NioCorp” or the “Company”) (NASDAQ:NB) (TSX:NB) is pleased to announce that the Company has entered into binding subscription agreements with certain individual acc

December 8, 2023 DEFA14A

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

December 8, 2023 DEF 14A

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

December 7, 2023 EX-16.1

Letter of BDO USA, P.C., dated December 5, 2023.

Exhibit 16.1 December 5, 2023 Securities and Exchange Commission 100 F Street N.E. Washington, D.C. 20549 We have been furnished with a copy of the response to Item 4.01 of Form 8-K for the event that occurred on December 4, 2023, to be filed by our former client, NioCorp Developments LTD. We agree with the statements made in response to that Item insofar as they relate to our Firm. Very truly you

December 7, 2023 8-K/A

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): October 9, 20

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): October 9, 2023 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorpora

December 7, 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): December 4, 2023 NioCorp Developm

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 4, 2023 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (Co

December 1, 2023 EX-99.1

NioCorp Completes Issuance and Sale of 75,000 Shares under the Standby Equity Purchase Agreement

Exhibit 99.1 NioCorp Completes Issuance and Sale of 75,000 Shares under the Standby Equity Purchase Agreement CENTENNIAL, Colo. (December 1, 2023) – NioCorp Developments Ltd. ("NioCorp" or the "Company") (Nasdaq: NB; TSX: NB) today issued and sold 75,000 shares (the “Advance Shares”) of the Company’s common shares, without par value (the “Common Shares”), upon settlement of the previously announce

December 1, 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): December 1, 2023 NioCorp Developm

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 1, 2023 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (Co

November 28, 2023 EX-99.1

NioCorp Delivers Advance Notice under the Standby Equity Purchase Agreement

Exhibit 99.1 NioCorp Delivers Advance Notice under the Standby Equity Purchase Agreement CENTENNIAL, Colo. (November 28, 2023) – NioCorp Developments Ltd. ("NioCorp" or the "Company") (Nasdaq: NB; | TSX: NB) today announced that it has delivered a written notice (the “Advance Notice”) pursuant to the previously announced Standby Equity Purchase Agreement, dated January 26, 2023 (the “Standby Equit

November 28, 2023 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): November 28, 2023 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (C

November 27, 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): November 21, 2023 NioCorp Develop

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 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (C

November 13, 2023 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 ☐ TRANSITION REPORT PURSUANT

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: 000-55710 NioCorp Developm

October 30, 2023 424B3

NioCorp Developments Ltd. 10,262,404 Common Shares

Filed Pursuant To Rule 424(b)(3) Registration No.: 333-270542 PROSPECTUS NioCorp Developments Ltd. 10,262,404 Common Shares This prospectus relates to the offer and sale from time to time of up to 10,262,404 of our common shares, without par value (“Common Shares”), consisting of Advance Shares (as defined below), by YA II PN, Ltd., a Cayman Islands exempt limited partnership (“YA” or the “Selling

October 30, 2023 424B3

NioCorp Developments Ltd. 17,519,864 Common Shares 23,095,947 Common Shares offered by the Selling Shareholders 5,666,667 Warrants offered by the Selling Shareholders

Filed Pursuant to Rule 424(b)(3) Registration No.: 333-271268 PROSPECTUS NioCorp Developments Ltd. 17,519,864 Common Shares 23,095,947 Common Shares offered by the Selling Shareholders 5,666,667 Warrants offered by the Selling Shareholders This prospectus relates to the issuance by us of up to an aggregate of 17,519,864 of our common shares, without par value (“Common Shares”), that may be issued

October 13, 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): October 9, 2023 NioCorp Developme

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 9, 2023 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (Com

October 13, 2023 POS AM

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 AMENDMENT NO. 1 AMENDMENT NO. 1 FORM S-3 ON FORM S-1 REGISTRATION STATEMENT THE SECURITIES ACT OF 1933 NioCorp Developments Ltd. (Exact name of registrant as specified in its cha

As filed with the Securities and Exchange Commission on October 13, 2023 Registration No.

October 13, 2023 CORRESP

October 13, 2023

October 13, 2023 CORRESPONDENCE FILING VIA EDGAR United States Securities and Exchange Commission Division of Corporation Finance Office of Energy & Transportation 100 F Street, NE Washington, D.

October 13, 2023 CORRESP

October 13, 2023

October 13, 2023 CORRESPONDENCE FILING VIA EDGAR United States Securities and Exchange Commission Division of Corporation Finance Office of Energy & Transportation 100 F Street, NE Washington, D.

October 13, 2023 EX-16.1

Letter of BDO USA, P.C., dated October 13, 2023.

Exhibit 16.1 October 13, 2023 Securities and Exchange Commission 100 F Street N.E. Washington, D.C. 20549 We have been furnished with a copy of the response to Item 4.01 of Form 8-K for the event that occurred on October 9, 2023, to be filed by NioCorp Developments LTD. We agree with the statements made in response to that Item insofar as they relate to our Firm. Very truly yours, /s/ BDO USA, P.C

October 13, 2023 POS AM

As filed with the Securities and Exchange Commission on October 13, 2023

As filed with the Securities and Exchange Commission on October 13, 2023 Registration No.

October 6, 2023 EX-23.9

Consent of Olsson

Exhibit 23.9 CONSENT OF QUALIFIED PERSON Olsson hereby consents to the public filing of Sections 1.8, 17, 22.8 and 23.1.7 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to the Annual Report on Form 10-K for the fiscal year ended June 30, 20

October 6, 2023 EX-23.11

Consent of Metallurgy Concept Solutions

Exhibit 23.11 CONSENT OF QUALIFIED PERSON Metallurgy Concept Solutions LLC hereby consents to the public filing of Sections 10.3, 14.1.3, 14.2.3, 14.3.3, and 14.4.3 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to the Annual Report on Form

October 6, 2023 EX-23.8

Consent of L3 Process Development

Exhibit 23.8 CONSENT OF QUALIFIED PERSON L3 Process Development hereby consents to the public filing of Sections 10.2, 10.2.1 to 10.2.3, 14.1.2, 14.1.4, 14.2.2, 14.2.4, 14.3.2, 14.3.4, 14.4.2, 14.4.4, 22.4, 22.6, 23.1.2, and 23.1.5 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Te

October 6, 2023 EX-23.7

Consent of Magemi Mining Inc.

Exhibit 23.7 CONSENT OF QUALIFIED PERSON Magemi Mining Inc. hereby consents to the public filing of Sections 10.1, 14.1.1, 14.2.1, 14.3.1, and 14.4.1 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to the Annual Report on Form 10-K for the f

October 6, 2023 EX-23.15

Consent of Mahmood Khwaja, P.E., CDM Smith

Exhibit 23.15 CONSENT OF QUALIFIED PERSON I, Mahmood Khwaja, P.E., consent to the public filing of Section 15.8 (the “Covered Section”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to the Annual Report on Form 10-K for the fiscal year ended June 30, 2023 (the “Fo

October 6, 2023 EX-23.16

Consent of Martin Lepage, P.Eng., Cementation

Exhibit 23.16 CONSENT OF QUALIFIED PERSON I, Martin Lepage, P.Eng., Ing., consent to the public filing of Sections 13.7.12 and 23.1.8 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to the Annual Report on Form 10-K for the fiscal year ended

October 6, 2023 EX-23.10

Consent of A2GC

Exhibit 23.10 CONSENT OF QUALIFIED PERSON A2GC hereby consents to the public filing of Sections 7.3, 13.1 and 23.1.3 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to the Annual Report on Form 10-K for the fiscal year ended June 30, 2023 (t

October 6, 2023 EX-23.17

Consent of Wynand Marx, M.Eng., BBE Consulting

Exhibit 23.17 CONSENT OF QUALIFIED PERSON I, Wynand Marx, M.Eng., consent to the public filing of Section 13.6 (the “Covered Section”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to the Annual Report on Form 10-K for the fiscal year ended June 30, 2023 (the “For

October 6, 2023 EX-23.14

Consent of Matt Hales, P.E., Cementation

Exhibit 23.14 CONSENT OF QUALIFIED PERSON I, Matt Hales, P.E., consent to the public filing of Sections 13.7.9, 13.7.10, 13.7.11, 13.7.14, 15.1.3, and 15.1.4 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to the Annual Report on Form 10-K f

October 6, 2023 EX-23.13

Consent of Everett Bird, P.E., Cementation

Exhibit 23.13 CONSENT OF QUALIFIED PERSON I, Everett Bird, P.E., consent to the public filing of Sections 13.7.1, 13.7.2, 13.7.3, 13.7.4 and 13.7.13 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to the Annual Report on Form 10-K for the fi

October 6, 2023 EX-23.12

Consent of Scott Honan, M.Sc., SME-RM, NioCorp

Exhibit 23.12 CONSENT OF QUALIFIED PERSON I, Scott Honan, M.Sc., SME-RM, consent to the public filing of Sections 13.7.5, 13.7.6, 13.7.7, 13.7.8, 13.7.15, 15.5, 15.6 and 22.7.1 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to the Annual Re

October 6, 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 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: 000-55710 NioCorp Developme

October 6, 2023 EX-21.1

Subsidiaries of NioCorp Developments Ltd.

Exhibit 21.1 List of Subsidiaries of NioCorp Developments Ltd. (the “Company”) Name State/Province of Formation Ownership 0896800 B.C. Ltd. (“0896800”) British Columbia 100% by the Company Elk Creek Resources Corp. Delaware 100% of the Class A common stock by 0896800

October 6, 2023 EX-4.25

Description of Securities

Exhibit 4.25 DESCRIPTION OF Securities Common Shares The authorized capital of NioCorp Developments Ltd., a British Columbia corporation (the “Company”), consists of an unlimited number of Common Shares, without par value. The holders of Common Shares are entitled to receive notice of and attend all meetings of shareholders, with each Common Share held entitling the holder to one vote on any resol

September 29, 2023 NT 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 12b-25 NOTIFICATION OF LATE FILING

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 12b-25 NOTIFICATION OF LATE FILING Commission File Number 000-55710 (Check One): ý Form 10-K o Form 20-F o Form 11-K o Form 10-Q o Form N-SAR o Form N-CSR For Period Ended: June 30, 2023 o Transition Report on Form 10-K o Transition Report on Form 10-Q o Transition Report on Form 20-F o Transition Report on Form N-SAR o Transition Report on Form 11-K For the Transition Period Ended: Read Instruction (on back page) Before Preparing Form.

September 18, 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): September 18, 2023 NioCorp Develo

0001512228 false A1 0001512228 2023-09-18 2023-09-18 0001512228 2023-09-18 2023-09-18 0001512228 NB:CommonSharesWithoutParValueMember 2023-09-18 2023-09-18 0001512228 NB:WarrantsEachExercisableFor1.

September 18, 2023 EX-99.1

NioCorp Completes Issuance and Sale of 75,000 Shares under the Standby Equity Purchase Agreement

Exhibit 99.1 NioCorp Completes Issuance and Sale of 75,000 Shares under the Standby Equity Purchase Agreement CENTENNIAL, Colo. (September 18, 2023) – NioCorp Developments Ltd. ("NioCorp" or the "Company") (Nasdaq: NB; TSX: NB) today issued and sold 75,000 shares (the “Advance Shares”) of the Company’s common shares, without par value (the “Common Shares”), upon settlement of the previously announ

September 13, 2023 EX-99.1

NioCorp Delivers Advance Notice under the Standby Equity Purchase Agreement

Exhibit 99.1 NioCorp Delivers Advance Notice under the Standby Equity Purchase Agreement CENTENNIAL, Colo. (September 13, 2023) – NioCorp Developments Ltd. ("NioCorp" or the "Company") (Nasdaq: NB; I TSX: NB) today announced that it has delivered a written notice (the “Advance Notice”) pursuant to the previously announced Standby Equity Purchase Agreement, dated January 26, 2023 (the “Standby Equi

September 13, 2023 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): September 13, 2023 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (

September 12, 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): September 12, 2023 NioCorp Develo

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 12, 2023 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (

September 12, 2023 EX-99.1

NioCorp Completes Issuance and Sale of 70,000 Shares under the Standby Equity Purchase Agreement

Exhibit 99.1 NioCorp Completes Issuance and Sale of 70,000 Shares under the Standby Equity Purchase Agreement CENTENNIAL, Colo. (September 12, 2023) – NioCorp Developments Ltd. ("NioCorp" or the "Company") (Nasdaq: NB; TSX: NB) today issued and sold 70,000 shares (the “Advance Shares”) of the Company’s common shares, without par value (the “Common Shares”), upon settlement of the previously announ

September 7, 2023 EX-99.1

NioCorp Delivers Advance Notice under the Standby Equity Purchase Agreement

Exhibit 99.1 NioCorp Delivers Advance Notice under the Standby Equity Purchase Agreement CENTENNIAL, Colo. (September 7, 2023) – NioCorp Developments Ltd. ("NioCorp" or the "Company") (Nasdaq: NB; I TSX: NB) today announced that it has delivered a written notice (the “Advance Notice”) pursuant to the previously announced Standby Equity Purchase Agreement, dated January 26, 2023 (the “Standby Equit

September 7, 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): September 7, 2023 NioCorp Develop

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 7, 2023 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (C

September 6, 2023 EX-99.1

NioCorp Provides Preliminary Financial Results for the Fiscal Year Ended June 30, 2023

Exhibit 99.1 NioCorp Provides Preliminary Financial Results for the Fiscal Year Ended June 30, 2023 CENTENNIAL, Colo. (September 6, 2023) – NioCorp Developments Ltd. (“NioCorp” or the “Company”) (NASDAQ:NB) (TSX:NB) today provided its preliminary financial results for the fiscal year ended June 30, 2023. Selected financial results expectations for the periods include: · Loss for the fiscal year en

September 6, 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): September 6, 2023 NioCorp Develop

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 6, 2023 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (C

September 1, 2023 EX-4.1

Form of Warrants issued in September 2023

Exhibit 4.1 THE WARRANTS EVIDENCED HEREBY ARE EXERCISABLE ON OR BEFORE 4:30 P.M. (VANCOUVER TIME) ON [●], 2025, AFTER WHICH TIME THE WARRANTS EVIDENCED HEREBY SHALL BE DEEMED TO BE VOID AND OF NO FURTHER FORCE OR EFFECT. [For all Warrants, include the following legend until such time as it is no longer required in accordance with applicable Canadian securities laws:] “UNLESS PERMITTED UNDER SECURI

September 1, 2023 EX-4.2

Form of Subscription Agreement in respect of units issued in September 2023

Exhibit 4.2 THE SECURITIES TO WHICH THIS SUBSCRIPTION AGREEMENT RELATES AND THE SECURITIES ISSUABLE UPON EXERCISE THEREOF HAVE NOT BEEN AND WILL NOT BE REGISTERED UNDER THE UNITED STATES SECURITIES ACT OF 1933, AS AMENDED (THE “1933 ACT”) OR ANY APPLICABLE STATE SECURITIES LAWS IN THE UNITED STATES AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD IN THE UNITED STATES (AS SUCH TERM IS DEFINED IN REGULA

September 1, 2023 EX-99.1

NioCorp Announces Closing of Private Placement for Gross Proceeds of US$1 Million

Exhibit 99.1 NioCorp Announces Closing of Private Placement for Gross Proceeds of US$1 Million CENTENNIAL, Colo. September 1, 2023— NioCorp Developments Ltd. (TSX: NB; NASDAQ: NB) (“NioCorp” the “Company”), is pleased to announce that it has closed a non-brokered private placement (the “Private Placement”) of 250,000 units of the Company at a price of USD$4.00 per unit, for aggregate gross proceed

September 1, 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): September 1, 2023 NioCorp Develop

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 1, 2023 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (C

August 23, 2023 POS AM

Power of Attorney

As filed with the Securities and Exchange Commission on August 22, 2023 Registration No.

August 23, 2023 POS AM

Power of Attorney

As filed with the Securities and Exchange Commission on August 22, 2023 Registration No.

August 23, 2023 EX-FILING FEES

Filing Fee Table

Exhibit 107 Calculation of Filing Fee Tables Form S-1 (Form Type) NioCorp Developments Ltd.

August 23, 2023 EX-21.1

Subsidiaries of NioCorp Developments Ltd.

Exhibit 21.1 List of Subsidiaries of NioCorp Developments Ltd. (the “Company”) Name State/Province of Formation Ownership 0896800 B.C. Ltd. (“0896800”) British Columbia 100% by the Company Elk Creek Resources Corp. Delaware 100% of the Class A common stock by 0896800

August 23, 2023 EX-21.1

Subsidiaries of NioCorp Developments Ltd.

Exhibit 21.1 List of Subsidiaries of NioCorp Developments Ltd. (the “Company”) Name State/Province of Formation Ownership 0896800 B.C. Ltd. (“0896800”) British Columbia 100% by the Company Elk Creek Resources Corp. Delaware 100% of the Class A common stock by 0896800

August 23, 2023 EX-10.6

Amendment to Contract, dated April 1, 2023, between the Company and 76 Resources, LLC

Exhibit 10.6 AMENDMENT TO CONTRACT AGREEMENT, made and entered into this 1st day of April 2023, by and between NIOCORP DEVELOPMENTS LTD., of 7000 South Yosemite Street, Suite115, Centennial, CO 80112 (hereinafter referred to as “NioCorp”) and 76 RESOURCES, LLC., having an office in Highlands Ranch, Co, USA (hereinafter referred to as “Consultant”). W I T N E S S E T H WHEREAS, NioCorp and Consulta

August 23, 2023 EX-10.6

Amendment to Contract, dated April 1, 2023, between the Company and 76 Resources, LLC

Exhibit 10.6 AMENDMENT TO CONTRACT AGREEMENT, made and entered into this 1st day of April 2023, by and between NIOCORP DEVELOPMENTS LTD., of 7000 South Yosemite Street, Suite115, Centennial, CO 80112 (hereinafter referred to as “NioCorp”) and 76 RESOURCES, LLC., having an office in Highlands Ranch, Co, USA (hereinafter referred to as “Consultant”). W I T N E S S E T H WHEREAS, NioCorp and Consulta

June 9, 2023 EX-99.1

NioCorp Completes Issuance and Sale of 100,000 Shares under the Standby Equity Purchase Agreement

Exhibit 99.1 NioCorp Completes Issuance and Sale of 100,000 Shares under the Standby Equity Purchase Agreement CENTENNIAL, Colo. (June 9, 2023) – NioCorp Developments Ltd. ("NioCorp" or the "Company") (Nasdaq: NB; TSX: NB) today issued and sold 100,000 shares (the “Advance Shares”) of the Company’s common shares, without par value (the “Common Shares”), upon settlement of the previously announced

June 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): June 9, 2023 NioCorp Developments

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 9, 2023 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (Commis

June 8, 2023 10-Q/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q/A (Amendment No. 1) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 ☐ TRANSI

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q/A (Amendment No. 1) ☒ 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: 000-55

June 8, 2023 10-Q/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q/A (Amendment No. 1) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended December 31, 2022 ☐ TRANSIT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q/A (Amendment No. 1) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period 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: 000-557

June 6, 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): June 6, 2023 NioCorp Developments

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 6, 2023 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (Commis

June 6, 2023 EX-99.1

NioCorp Delivers Advance Notice under the Standby Equity Purchase Agreement

Exhibit 99.1 NioCorp Delivers Advance Notice under the Standby Equity Purchase Agreement CENTENNIAL, Colo. (June 6, 2023) – NioCorp Developments Ltd. ("NioCorp" or the "Company") (Nasdaq: NB; TSX: NB) today announced that it has delivered a written notice (the “Advance Notice”) pursuant to the previously announced Standby Equity Purchase Agreement, dated January 26, 2023 (the “Standby Equity Purch

May 30, 2023 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, 2023 ☐ TRANSITION REPORT PURSUANT TO

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: 000-55710 NioCorp Developments

May 24, 2023 EX-99.1

NioCorp Receives Notification from Nasdaq Related to Delayed Quarterly Report on Form 10-Q

Exhibit 99.1 NioCorp Receives Notification from Nasdaq Related to Delayed Quarterly Report on Form 10-Q CENTENNIAL, Colo. (May 24, 2023) – NioCorp Developments Ltd. (“NioCorp” or the “Company”) (Nasdaq: NB; TSX: NB) announced that it received a letter from the Listing Qualifications Department of The Nasdaq Stock Market LLC (“Nasdaq”) on May 24, 2023, indicating that, because the Company has not f

May 24, 2023 8-K

Regulation FD Disclosure, Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing, 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): May 24, 2023 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (Commis

May 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): May 19, 2023 NioCorp Developments

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 19, 2023 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (Commis

May 16, 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 15, 2023 NioCorp Developments

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 15, 2023 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (Commis

May 16, 2023 NT 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 12b-25 NOTIFICATION OF LATE FILING

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 12b-25 NOTIFICATION OF LATE FILING Commission File Number 000-55710 (Check One): o Form 10-K o Form 20-F o Form 11-K ý Form 10-Q o Form N-SAR o Form N-CSR For Period Ended: March 31, 2023 o Transition Report on Form 10-K o Transition Report on Form 10-Q o Transition Report on Form 20-F o Transition Report on Form N-SAR o Transition Report on Form 11-K For the Transition Period Ended: Read Instruction (on back page) Before Preparing Form.

May 9, 2023 424B3

NioCorp Developments Ltd. 16,123,149 Common Shares 5,666,667 Warrants

Filed Pursuant to Rule 424(b)(3) Registration No. 333-271268 PROSPECTUS NioCorp Developments Ltd. 16,123,149 Common Shares 5,666,667 Warrants This prospectus relates to the offer and sale from time to time by the selling shareholders identified herein (collectively, the “Selling Shareholders”) of (i) up to an aggregate of 16,123,149 of our common shares, without par value (“Common Shares”), and (i

May 9, 2023 424B3

NioCorp Developments Ltd. 17,519,864 Common Shares

Filed Pursuant to Rule 424(b)(3) Registration No. 333-271266 PROSPECTUS NioCorp Developments Ltd. 17,519,864 Common Shares This prospectus relates to the issuance by us of up to an aggregate of 17,519,864 of our common shares, without par value (“Common Shares”), that may be issued upon exercise of 15,666,626 warrants issued in connection with the Transactions (as defined herein) (the “NioCorp Ass

May 4, 2023 424B3

NioCorp Developments Ltd. 10,495,370 Common Shares

Filed Pursuant to Rule 424(b)(3) Registration No. 333-270541 PROSPECTUS NioCorp Developments Ltd. 10,495,370 Common Shares This prospectus relates to the offer and sale from time to time of up to an aggregate of 10,495,370 of our common shares, without par value (“Common Shares”), by YA II PN, Ltd. (“YA”), certain private placement investors (collectively, the “Private Placement Investors”), and R

May 4, 2023 424B3

NioCorp Developments Ltd. 10,588,617 Common Shares

Filed Pursuant to Rule 424(b)(3) Registration No. 333-270542 PROSPECTUS NioCorp Developments Ltd. 10,588,617 Common Shares This prospectus relates to the offer and sale from time to time of up to 10,588,617 of our common shares, without par value (“Common Shares”), consisting of (i) up to 81,213 Commitment Shares (as defined below) and (ii) up to 10,507,404 Advance Shares (as defined below), by YA

May 2, 2023 CORRESP

May 2, 2023

May 2, 2023 VIA EDGAR Securities and Exchange Commission Division of Corporation Finance 100 F Street, NE Washington, DC 20549 Re: NioCorp Developments Ltd.

May 2, 2023 CORRESP

May 2, 2023

May 2, 2023 VIA EDGAR Securities and Exchange Commission Division of Corporation Finance 100 F Street, NE Washington, DC 20549 Re: NioCorp Developments Ltd.

April 28, 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): April 28, 2023 NioCorp Developmen

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 28, 2023 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (Comm

April 27, 2023 EX-FILING FEES

EX-FILING FEES

Exhibit 107 The prospectus supplement to which this exhibit is attached is a final prospectus for the related offering. The maximum aggregate offering price of that offering is $1,999,997.40.

April 27, 2023 424B5

314,465 Common Shares

Filed pursuant to Rule 424(b)(5) Registration No. 333-260673 Prospectus Supplement (to Prospectus dated November 16, 2021) 314,465 Common Shares We are offering 314,465 of our common shares, without par value (“Common Shares”), to a certain institutional and accredited investor pursuant to this prospectus supplement and the accompanying prospectus. We have not retained any underwriter or placement

April 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): April 19, 2023 NioCorp Developmen

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 19, 2023 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 000-55710 (Comm

April 19, 2023 EX-99.2

RISKS RELATED TO OUR COMMON SHARES

Exhibit 99.2 RISKS RELATED TO OUR COMMON SHARES Investing in common shares, without par value (“Common Shares”), of NioCorp Developments Ltd. (“we,” “our,” “us,” “NioCorp” or the “Company”) involves a high degree of risk. Before making a decision to invest in our Common Shares, you should carefully consider the risks described below and under the heading “Risk Factors” in any prospectus or prospec

April 19, 2023 EX-99.1

CERTAIN UNITED STATES FEDERAL INCOME TAX CONSIDERATIONS

Exhibit 99.1 CERTAIN UNITED STATES FEDERAL INCOME TAX CONSIDERATIONS The following is a general summary of certain U.S. federal income tax considerations applicable to a U.S. Holder (as defined below) arising from and relating to the acquisition, ownership, and disposition of common shares, without par value (the “Common Shares”), of NioCorp Developments Ltd., a corporation incorporated under the

April 14, 2023 EX-23.14

Consent of Scott Honan, M.Sc., SME-RM, NioCorp

Exhibit 23.14 CONSENT OF QUALIFIED PERSON I, Scott Honan, M.Sc., SME-RM, consent to the public filing of Sections 13.7.5, 13.7.6, 13.7.7, 13.7.8, 13.7.15, 15.5, 15.6 and 22.7.1 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registra

April 14, 2023 EX-23.7

Consent of Tetra Tech

Exhibit 23.7 CONSENT OF QUALIFIED PERSON Tetra Tech hereby consents to the public filing of Sections 14.5, 15.1.1, 15.1.2, 15.2 to 15.4, 22.7 and 23.1.6 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Statement on Form S

April 14, 2023 EX-23.14

Consent of Metallurgy Concept Solutions

Exhibit 23.14 CONSENT OF QUALIFIED PERSON Metallurgy Concept Solutions LLC hereby consents to the public filing of Sections 10.3, 14.1.3, 14.2.3, 14.3.3, and 14.4.3 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Stateme

April 14, 2023 EX-4.5

Joinder to Sponsor Support Agreement, dated as of March 17, 2023, by and among NioCorp Developments Ltd. and each of the Holders party thereto

Exhibit 4.5 JOINDER THIS JOINDER (this “Joinder”) to the Sponsor Support Agreement, dated as of September 25, 2022 (the “Agreement”), by and among GX Sponsor II LLC, a Delaware limited liability company (“Sponsor Holdco”), the Persons set forth on Schedule I thereto, GX Acquisition Corp. II, as predecessor by merger to Elk Creek Resources Corp., a Delaware corporation (“GX”), and NioCorp Developme

April 14, 2023 EX-23.19

Consent of Martin Lepage, P.Eng., Cementation

Exhibit 23.19 CONSENT OF QUALIFIED PERSON I, Martin Lepage, P.Eng., consent to the public filing of Sections 13.7.12 and 23.1.8 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Statement on Form S-3 and any and all amendm

April 14, 2023 EX-23.20

Consent of Wynand Marx, M.Eng., BBE Consulting

Exhibit 23.20 CONSENT OF QUALIFIED PERSON I, Wynand Marx, M.Eng., consent to the public filing of Section 13.6 (the “Covered Section”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Statement on Form S-3 and any and all amendments and supplemen

April 14, 2023 EX-23.7

Consent of Optimize Group Inc.

Exhibit 23.7 CONSENT OF QUALIFIED PERSON Optimize Group Inc. hereby consents to the public filing of Sections 1.7, 12, 13.3 to 13.5, 15.7, 22.5 and 23.1.4 (the “Covered Sections”) of the Technical Report Summary titled “Technical Report Summary, Elk Creek Project, Nebraska” with an Effective Date of June 30, 2022 (the “Technical Report Summary”) as an exhibit to this Registration Statement on Form

Other Listings
DE:BR30
Fintel data has been cited in the following publications:
Daily Mail Fox Business Business Insider Wall Street Journal The Washington Post Bloomberg Financial Times Globe and Mail
NASDAQ.com Reuters The Guardian Associated Press FactCheck.org Snopes Politifact
Federal Register The Intercept Forbes Fortune Magazine TheStreet Time Magazine Canadian Broadcasting Corporation International Business Times
Cambridge University Press Investopedia MarketWatch NY Daily News Entrepreneur Newsweek Barron's El Economista