6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TORULE 13a-16 OR 15d-16 UNDER

THE SECURITIES EXCHANGE ACT OF 1934

For the month of July 2026

Commission File Number: 001-41369

Osisko Gold Group Inc.

(Translation of registrant’s name into English)

155 University Avenue, Suite 1450, Toronto,Ontario, M5H 3B7, Canada

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F ¨ Form 40-F x

EXHIBIT INDEX

Exhibit
99.1	Osisko Gold Group Inc. - Notice of Change in Corporate Structure dated July 20, 2026
99. 2	Osisko Gold Group Inc. - Form 51-102F3 Material Change Report dated July 20, 2026

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	Osisko Gold Group Inc.
	(Registrant)
Date: July 20, 2026	/s/ Laurence Farmer
	Laurence Farmer
	General Counsel and Vice President Strategic Development

Exhibit 99.1

NOTICE OF CHANGE IN CORPORATE STRUCTURE

Pursuant to Section 4.9 of National Instrument 51-102

Item 1	Names of the Parties to the Transaction

Osisko Gold Group Inc. (formerly Osisko Development Corp.) (the "Company")

Item 2	Description of the Transaction

On July 14, 2026, the Company changed its name from "Osisko Development Corp." to "Osisko Gold Group Inc." and changed the province of its registered office from Québec to Ontario. The Company's new trading symbol is "OGG". Its new common share CUSIP number is 68827X105 and ISIN number is CA68827X1050.

Item 3	Effective Date of the Transaction

July 14, 2026.

Item 4	Names of each party, if any, that ceased to be a Reporting Issuer subsequent to the Transaction and of each Continuing Entity

Not applicable.

Item 5	Date of the Issuer’s First Financial Year-End Subsequent to the Transaction

Not applicable.

Item 6	Periods, including comparative periods, if any, of the Interim Financial Reports and the Annual FinancialStatements Required to be Filed for the Reporting Issuer’s First Financial Year Subsequent to the Transaction

Not applicable.

Item 7	Documents filed under NI 51-102 that describe the Transaction

The following documents describing the name change were filed on SEDAR+ under the Company's issuer profile at www.sedarplus.ca:

(a)	News release dated July 15, 2026;
(b)	Articles and Certificate of Amendment dated July 14, 2026; and
---	---
(c)	Material Change Report dated July 20, 2026.
---	---
Item 8	Date of Notice
---	---

July 20, 2026.

Exhibit 99.2

FORM 51-102F3 MATERIAL CHANGE REPORT

Item 1	Name and Address of Company

Osisko Gold Group Inc. (formerly Osisko Development Corp.) (the "Company")

155 University Avenue, Suite 1450

Toronto, Ontario M5H 3B7

Item 2	Date of Material Change

July 14, 2026

Item 3	News Release

A news release with respect to the material change referred to in this report was issued by the Company through Globe Newswire on July 15, 2026 and subsequently filed on SEDAR+ (www.sedarplus.ca) under the Company's issuer profile on July 15, 2026.

Item 4	Summary of Material Change

On July 14, 2026, the Company filed articles of amendment effecting a change of: (i) its name from "Osisko Development Corp." to "Osisko Gold Group Inc." (the "Name Change") and (ii) the province of its registered office from Québec to Ontario (the "Registered Office Change").

In connection with the Name Change, the Company changed its stock ticker symbol for (i) its common shares listed on the TSX Venture Exchange (the "TSXV") and the New York Stock Exchange (the "NYSE") from "ODV" to "OGG", (ii) its warrants listed on the TSXV from "ODV.WT.A", "ODV.WT.U" and "ODV.WT.V" to "OGG.WT.A", "OGG.WT.U" and "OGG.WT.V", respectively, and (iii) its warrants listed on Nasdaq from "ODVWZ" to "OGGWZ".

Item 5	Full Description of Material Change

On July 14, 2026, the Company changed its name from "Osisko Development Corp." to "Osisko Gold Group Inc." and changed the province of the Company's registered office from Québec to Ontario. The Name Change and the Registered Office Change were approved by shareholders of the Company at its annual and special meeting of shareholders held on June 23, 2026.

In connection with the Name Change, the common shares of the Company began trading on the TSXV and NYSE under a new ticker symbol "OGG" at the start of trading on July 20, 2026 on each of the TSXV and the NYSE. In connection with the Name Change, the following new CUSIP and ISIN numbers have been assigned to the common shares of the Company: CUSIP 68827X105 and ISIN CA68827X1050.

In addition, the Company changed its stock ticker symbol for its warrants listed on the TSXV from "ODV.WT.A", "ODV.WT.U" and "ODV.WT.V" to "OGG.WT.A", "OGG.WT.U" and "OGG.WT.V", respectively, and its warrants listed on Nasdaq from "ODVWZ" to "OGGWZ", effective at the start of trading on July 20, 2026. The following new CUSIP and ISIN numbers have been assigned to the warrants of the Company: (i) OGG.WT.A: CUSIP 68827X139 and ISIN CA68827X1399; (ii) OGG.WT.U: CUSIP 68827X113 and ISIN CA68827X1134; and (iii) OGG.WT.V: CUSIP 68827X121 and ISIN CA68827X1217.

A copy of the articles and certificate of amendment reflecting the Name Change and Registered Office Change are available on SEDAR+ (www.sedarplus.ca) under the Company's issuer profile.

Item 6	Reliance on subsection 7.1(2) of National Instrument 51-102

Not applicable.

Item 7	Omitted Information

Not applicable.

Item 8	Executive Officer

For additional information, please contact Sean Roosen, Chairman and CEO at +1 (514) 940-0685 or [email protected], or Philip Rabenok, Vice President, Investor Relations at +1 (437) 423-3644 or [email protected].

Item 9	Date of Report

July 20, 2026.