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 May 2024

Commission File Number: 001-41369

Osisko Development Corp.

(Translation of registrant’s name into English)

1100 Avenue des Canadiens-de-Montréal,Suite 300

(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

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.

Exhibit 99.1

STATEMENT UNDER THE ACT RESPECTING TRANSPARENCYMEASURES

IN THE MINING, OIL AND GAS INDUSTRIES

(s.1)

Fiscal year covered by the statement: from January 1, 2023 to December 31, 2023.

Name of the entity filing the statement:

OSISKO DEVELOPMENT CORP.

Name(s) of the subsidiary or subsidiaries for which the entity files the statement, where applicable:

BARKEVILLE GOLD MINES LTD., TINTIC CONSOLIDATED METALS LLC, SAPUCHIMINERA S. DE R.L. de C.V., COULON MINES INC., GENERAL PARTNERSHIP OSISKO BAIE JAMES

Certificate

I certify that I have examined the information contained in the statement of Osisko Development Corp. and its subsidiaries for the fiscal year that began on January 1, 2023 and ended on December 31, 2023. To my knowledge and having exercised due diligence, the information contained in the statement is, in all material respects for the purposes of the Act, true, accurate and complete.