Results of Operations and Financial Condition. On August 6, 2026, Montauk Renewables, Inc. filed a headline earnings per share (“HEPS”) report with the Johannesburg Stock Exchange (“JSE”), a self-regulatory organization in South Africa, that includes certain historical financial information for the six months ended June 30, 2026. The HEPS report was prepared for the purpose of complying with the reporting requirements of the JSE. A copy of the HEPS report is attached as Exhibit 99.1 to this C…

of this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

of this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Results of Operations and Financial Condition. On March 12, 2026, Montauk Renewables, Inc. filed a headline earnings per share (“HEPS”) report with the Johannesburg Stock Exchange (“JSE”), a self-regulatory organization in South Africa, that includes certain historical financial information for the fiscal year ended December 31, 2025. The HEPS report was prepared for the purpose of complying with the reporting requirements of the JSE. A copy of the HEPS report is attached as Exhibit 99.1 to t…

of this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Entry into a Material Definitive Agreement. On December 31, 2025, Montauk Energy Holdings, LLC (“MEH”), a subsidiary of Montauk Renewables, Inc. (“Montauk”), entered into the Sixth Amendment to the Second Amended and Restated Revolving Credit and Term Loan Agreement (the “Amended Credit Agreement”), by and among MEH, the financial institutions signatory thereto (collectively, the “Lenders”) and Comerica Bank, as administrative agent for the Lenders (the “Agent”), amending Montauk’s existing S…

of this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Results of Operations and Financial Condition. On August 7, 2025, Montauk Renewables, Inc. filed a headline earnings per share (“HEPS”) report with the Johannesburg Stock Exchange (“JSE”), a self-regulatory organization in South Africa, that includes certain historical financial information for the six months ended June 30, 2025. The HEPS report was prepared for the purpose of complying with the reporting requirements of the JSE. A copy of the HEPS report is attached as Exhibit 99.1 to this C…

of this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

of this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Other Events On April 10, 2025, the Board of Directors of Montauk Renewables, Inc. (the “Company”) authorized a share repurchase program (the “Share Repurchase Program”), pursuant to which the Company may, from time to time, purchase currently outstanding shares of its common stock for an aggregate repurchase price not to exceed $5,000,000. Share repurchases may be executed through various means, including, without limitation, open market transactions, privately negotiated transactions or oth…

Results of Operations and Financial Condition. On March 17, 2025, Montauk Renewables, Inc. filed a headline earnings per share (“HEPS”) report with the Johannesburg Stock Exchange (“JSE”), a self-regulatory organization in South Africa, that includes certain historical financial information for the fiscal year ended December 31, 2024. The HEPS report was prepared for the purpose of complying with the reporting requirements of the JSE. A copy of the HEPS report is attached as Exhibit 99.1 to t…

of this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Entry into a Material Definitive Agreement. On March 5, 2025, Montauk Renewables, Inc. (“Montauk”) entered into the Fifth Amended and Restated Loan Agreement and Secured Promissory Note (the “MNK Amendment”), by and between Montauk and Montauk Holdings Proprietary Limited (“MNK”), previously Montauk Holdings Limited, amending and restating in its entirety the Fourth Loan Agreement and Secured Promissory Note, as amended (the “MNK Loan Agreement”). The MNK Amendment increases the principal amo…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information set forth under

Director — Michael Jacobson: Mr. Michael Jacobson resigned from the Board of Directors.

of this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Results of Operations and Financial Condition. On August 12, 2024, Montauk Renewables, Inc. filed a headline earnings per share (“HEPS”) report with the Johannesburg Stock Exchange (“JSE”), a self-regulatory organization in South Africa, that includes certain historical financial information for the fiscal second quarter 2024. The HEPS report was prepared for the purpose of complying with the reporting requirements of the JSE. A copy of the HEPS report is attached as Exhibit 99.1 to this Curr…

of this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

of this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Director — Michael A. Jacobson: Mr. Michael A. Jacobson was appointed to the Board and Audit Committee.

Results of Operations and Financial Condition. On March 15, 2024, Montauk Renewables, Inc. filed a headline earnings per share (“HEPS”) report with the Johannesburg Stock Exchange (“JSE”), a self-regulatory organization in South Africa, that includes certain historical financial information for the fiscal year ended December 31, 2023. The HEPS report was prepared for the purpose of complying with the reporting requirements of the JSE. A copy of the HEPS report is attached as Exhibit 99.1 to t…

of this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Entry into a Material Definitive Agreement. On December 27, 2023, Montauk Renewables, Inc. (“Montauk”) entered into the Fourth Amended and Restated Loan Agreement and Secured Promissory Note (the “MNK Amendment”), by and between Montauk and Montauk Holdings Proprietary Limited (“MNK”), previously Montauk Holdings Limited, amending and restating in its entirety the Third Loan Agreement and Secured Promissory Note, as amended (the “MNK Loan Agreement”). The MNK Amendment extends the maturity da…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information set forth under