6-K

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

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of June 2025

Commission File No. 000-56391

Greenbriar Sustainable Living Inc. (Translation of registrant's name into English)

632 Foster Avenue Coquitlam, British Columbia, Canada V3J 2L7

(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 ☐

SUBMITTED HEREWITH

Exhibits

SIGNATURE

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.

Greenbriar Sustainable Living Inc.

/s/ Jeff Ciachurski ______________________________________ Jeff Ciachurski Chief Executive Officer

Date: June 6, 2025

Greenbriar Sustainable Living Inc.: Exhibit 99.1 - Filed by newsfilecorp.com

NEWS RELEASE

Greenbriar Announces Shares for Debt Settlement

Scottsdale, Arizona, June 6, 2025 - Greenbriar Sustainable Living Inc. (TSXV: GRB) (OTC: GEBRF) ("Greenbriar" or the "Company") announces it has agreed to issue an aggregate of 2,637,556 units in the capital of the Company at a deemed price per unit of $0.45 to settle approximately $1,186,900 in debt (the "Shares for Debt Settlement"). Each unit will consist of one common share and one full common share purchase warrant. Each warrant will be exercisable into one common share of the Company at $0.55 for a period of 3 years. Of the Shares for Debt Settlement, $1,141,900 is owed to arms-length creditors and $45,000 is owed to an insider of the Company. The board of directors and management of the Company believe that the proposed Shares for Debt Settlement is in the best interests of the Company because it allows the Company to preserve its funds for operations.

The Shares for Debt Settlement is subject to TSX Venture Exchange approval.

The settlement shares will be subject to a statutory four-month hold period from the date of issuance.

The debt settlement with the insider will be a "related party transaction" under Policy 5.9 of the TSX Venture Exchange and Multilateral Instrument 61-101 - Protection of Minority Security Holders in Special Transactions ("MI 61-101"). The debt settlement with the insider is exempt from the minority approval and formal valuation requirements of MI 61-101 pursuant to subsections 5.5(a) and 5.7(1)(a) of MI 61-101 as neither the fair market value of the debt, nor the fair market value of the shares to be issued in settlement of the debt, exceeds 25% of the Company's market capitalization.

About Greenbriar Sustainable Living Inc.

Greenbriar is a leading developer of sustainable real estate and renewable energy. With long-term, high impact projects and led by a successful industry-recognized operating and development team, Greenbriar targets deep valued assets directed at accretive shareholder value.

ON BEHALF OF THE BOARD OF DIRECTORS

"Jeff Ciachurski"

Jeffrey J. Ciachurski Chief Executive Officer and Director Phone: 949.903.5906

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The TSX Venture Exchange has not reviewed and does not accept responsibility for the accuracy or adequacy of this release. Neither the TSX Venture Exchange nor its Regulation Service Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

This news release includes "forward-looking statements" and "forward-looking information" within the meaning of Canadian securities laws and United States securities laws (together, "forward-looking statements"). All statements included in this news release, other than statements of historical fact, are forward-looking statements including, without limitation, statements with respect to the closing of the Shares for Debt Transaction, the issuance of Common Shares, and the approval of the Shares for Debt Transaction by the TSX Venture Exchange. Forward-looking statements include predictions, projections and forecasts and are often, but not always, identified by the use of words such as "anticipate", "believe", "plan", "estimate", "expect", "potential", "target", "budget", "propose" and "intend" and statements that an event or result "may", "will", "should", "could" or "might" occur or be achieved and other similar expressions and includes the negatives thereof.

Forward-looking statements are based on a number of assumptions and estimates that, while considered reasonable by management based on the business and markets in which the Company operates, are inherently subject to significant operational, economic, and competitive uncertainties, risks and contingencies. These include assumptions regarding, among other things: general business and economic conditions. There can be no assurance that forward-looking statements will prove to be accurate and actual results, and future events could differ materially from those anticipated in such statements. Important factors that could cause actual results to differ materially from the Company's expectations include those described under the heading "Risks and Uncertainties" in the Company's most recently filed MD&A (a copy of which is available under the Company's SEDAR profile at www.sedarplus.ca). The Company does not undertake to update or revise any forward-looking statements, except in accordance with applicable law.