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-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of December 2025.

Commission File Number 001-41810

GreenfireResources Ltd.

(Exact name of Registrant as specified in its charter)

N/A

(Translation of Registrant’s name)

Suite 1900, 205 – 5^th^ Avenue SW

Calgary, Alberta T2P 2V7

(403) 264-9046

(Address and telephone number of registrant’s principal executive offices)

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 ☒

GREENFIRE RESOURCES LTD.

DOCUMENTS INCLUDED AS PART OF THIS REPORT

Exhibit

1

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.

Date: December 23, 2025

2

Exhibit 99.1

Form 51-102F3

MATERIAL CHANGE REPORT

Greenfire Resources Ltd. (the “Corporation”)

1900, 205 - 5th Avenue S.W.

Calgary, Alberta T2P 2V7

December 19, 2025.

The news release with respect to the material change referred to in this material change report was disseminated by the Corporation through a recognized newswire on December 19, 2025, and subsequently filed under the Corporation’s profile on the System for Electronic Data Analysis and Retrieval+ (SEDAR+) at www.sedarplus.ca and with the U.S. Securities Exchange Commission at www.sec.gov.

On December 19, 2025 the Corporation announced the completion of its previously announced refinancing initiatives (the “Refinancing Initiatives”), which included: (i) a C$300.0 million offering of rights (the “Rights”) to all eligible shareholders of the Corporation to purchase additional common shares of the Corporation (the “Common Shares”) which expired at 4:00 p.m. (Calgary time) on December 16, 2025 (the “Rights Offering”); (ii) the redemption of the Corporation’s outstanding US$237.5 million aggregate principal amount of 12% senior secured notes due 2028 (the “2028 Notes”); and (iii) upsizing the Corporation’s revolving credit facility with a syndicate of Canadian banks (the “Senior Credit Facility”) to C$275.0 million.

On December 19, 2025, the Corporation announced the completion of the Refinancing Initiatives. The Refinancing Initiatives included completion of the Corporation’s a C$300.0 million Rights Offering on December 17, 2025, the net proceeds of which, together with cash on hand, were used to redeem the Corporation’s 2028 Notes, and the upsizing of the Corporation’s Senior Credit Facility to C$275.0 million. As a result of the Refinancing Initiatives, the Corporation was debt-free as of December 19, 2025.

At the completion of the Rights Offering and pursuant to the exercise of Rights, the Corporation issued an aggregate of 55,147,055 Common Shares, representing the maximum allotment available to holders of Common Shares at the record date of November 17, 2025 (adjusted for rounding for fractional shares). Each Right entitled the holder thereof to acquire 0.7849 of a Common Share, with no fractional Common Shares issued. Common Shares acquired pursuant to the exercise of Rights were issued at a price of C$5.44 or US$3.85 per Common Share for aggregate gross proceeds of approximately C$298.5 million (after conversion of U.S. dollar subscriptions). 53,573,107 Common Shares were issued under the basic subscription privilege and 1,573,948 Common Shares were issued under the additional subscription privilege. As a result of the oversubscription, Common Shares subscribed for pursuant to the additional subscription privilege were subject to proration in accordance with the terms of the Rights Offering, as set forth in the Corporation’s rights offering circular dated November 5, 2025. As the Rights Offering was fully subscribed, the Corporation did not utilize the previously announced standby commitment whereby certain limited partnerships comprising Waterous Energy Fund agreed to acquire any Common Shares not subscribed for under the Rights Offering. As of December 19, 2025, the Corporation had 125,404,146 Common Shares issued and outstanding.

Not applicable.

Not applicable.

For further information, contact Travis Belak, Vice President, Finance, by telephone at 403.264.9046.

December 23, 2025.