Montauk Renewables, Inc.

(dollars in thousands, except per-share amounts)

NOTE 1 – DESCRIPTION OF BUSINESS

Operations and organization

Montauk Renewables’ Business

Montauk Renewables, Inc. (the “Company” or “Montauk Renewables”) is a renewable energy company specializing in the management, recovery and conversion of biogas into Renewable Natural Gas (“RNG”). The Company captures methane, preventing it from being released into the atmosphere, and converts it into either RNG or electrical power for the electrical grid (“Renewable Electricity”). The Company, headquartered in Pittsburgh, Pennsylvania, develops, operates and manages landfill methane-fueled renewable energy projects. The Company has current operations at 13 operating projects located in California, Idaho, Ohio, Oklahoma, Pennsylvania, North Carolina and Texas. The Company sells RNG and Renewable Electricity, taking advantage of Environmental Attribute premiums available under federal and state policies that incentivize their use.

Two of the Company’s key revenue drivers are sales of captured gas and sales of Renewable Identification Numbers (“RINs”) to fuel blenders. The Renewable Fuel Standard (“RFS”) is an Environmental Protection Agency (“EPA”) administered federal law that requires transportation fuel to contain a minimum volume of renewable fuel. RNG derived from landfill methane, agricultural digesters and wastewater treatment facilities used as a vehicle fuel qualifies as a D3 (cellulosic biofuel with a 60% greenhouse gas reduction requirement) RIN. The RINs are compliance units for fuel blenders that were created by the RFS program in order to reduce greenhouse gases and imported petroleum into the United States.

An additional program utilized by the Company is the Low Carbon Fuel Standard (“LCFS”). This is state specific and is designed to stimulate the use of low-carbon fuels. To the extent that RNG from the Company’s facilities is used as a transportation fuel in states that have adopted an LCFS program, it is eligible to receive an Environmental Attribute additional to the RIN value under the federal RFS.

Another key revenue driver is the sale of captured electricity and the associated environmental premiums related to renewable electricity sales. The Company’s electric facilities are designed to conform to and monetize various state renewable portfolio standards requiring a percentage of the electricity produced in that state to come from a renewable resource. Such premiums are in the form of Renewable Energy Credits (“RECs”). The Company’s largest electric facility, located in California, receives revenue for the monetization of RECs as a part of a purchase power agreement.

Collectively, the Company benefits from federal and state government incentives in the United States, provided in the form of RINs, RECs, LCFS credits, tax credits and other incentives to end users, distributors, system integrators and manufacturers of renewable energy projects, that promote the use of renewable energy, as Environmental Attributes.

NOTE 2 – SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and with the instructions of the SEC on Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and disclosures required by GAAP for complete financial statements. In the opinion of management, the unaudited condensed consolidated financial statements include all adjustments necessary, which are of a normal and recurring nature, for the fair presentation of the Company’s financial position and of the results of operations and cash flows for the periods presented. These financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto for the year ended December 31, 2025 included in the Company’s Annual Report on Form 10-K filed with the SEC on March 11, 2026 (the “2025 Annual Report”). The results of operations for the three and six months ended June 30, 2026 in this report are not necessarily indicative of the results that may be expected for any other interim period or for the full year. The balance sheet at December 31, 2025, has been derived from the audited financial statements as of that date. For further information, refer to the Company’s audited financial statements and notes thereto included for the year ended December 31, 2025 in the 2025 Annual Report.

Principles of Consolidation

The historical consolidated financial information included reflects the historical results of operations and financial position of Montauk USA through January 4, 2021 when MNK sold the membership interest of Montauk USA. The consolidated financial statements of Montauk USA became the Company’s historical financial statements following the IPO. Certain historical financial information included relates to periods prior to the Reorganization Transactions. On December 31, 2024, the Company re-assessed its determination of the primary beneficiary of the Variable Interest Entity ("VIE") MNK under the guidance in ASC 810, Consolidation. Refer to Note 17 – Related Parties for further information. All intercompany balances and transactions have been eliminated in consolidation.

The Company utilizes the equity method of accounting for companies where its ownership is greater than 50% and significant but controlling interest does not exist.

Cash and Cash Equivalents

Cash and cash equivalents include highly liquid investments with maturity dates of three months or less from the date of purchase and are recorded at cost. The Company may hold cash in excess of federally insured limits. Restricted cash is classified as current or non-current based on the terms of the underlying agreements and represents cash held as deposits, cash held in escrow and cash collateral for financial letters of credit.

Reclassifications

Certain prior period amounts have been reclassified to conform to the current period financial statement presentation. These reclassifications had no effect on the previously reported total assets, total liabilities, stockholders’ equity, results of operations or cash flows.

Segment Reporting

The Company reports segment information intwo segments: RNG and Renewable Electricity Generation. This is consistent with the internal reporting provided to the chief operating decision maker who evaluates operating results and performance. The aforementioned business services and offerings described in Note 1 are defined by management as two distinct operating segments: RNG and Renewable Electricity Generation. Below is a description of the Company’s operating segments and other activities.

The RNG segment represents the sale of gas sold at fixed-price contracts, counterparty share RNG volumes and applicable Environmental Attributes. This business unit represents the majority of the revenues generated by the Company. The Renewable Electricity Generation segment represents the sale of captured electricity and applicable Environmental Attributes. Corporate & Other relates to additional discrete financial information for the corporate function. It is primarily used as a shared service center for maintaining functions such as executive, accounting, treasury, legal, human resources, tax, environmental, engineering and other operations functions not otherwise allocated to a segment. As such, the corporate entity is not determined to be an operating segment but is discretely disclosed for purposes of reconciliation to the Company’s consolidated financial statements.

Use of Estimates

The preparation of financial statements, in conformity with accounting principles generally accepted in the United States (“GAAP”), requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Recently Adopted Accounting Standards

In December 2025, the FASB issued ASU No. 2025-07, Derivatives and Hedging (Topic 815) and Revenue from Contracts with Customers (Topic 606): derivatives scope refinements and scope clarification for share-based noncash consideration from a customer in a revenue contract. This ASU (1) refines the scope of the guidance on derivatives in ASC 815 (Issue 1) and (2) clarifies the guidance on share-based payments from a customer in ASC 606 (Issue 2). The Company has adopted the standard retrospectively, as of December 31, 2025.

In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. The amendments in 2023-09 aim to enhance the transparency and decision usefulness of income tax disclosures. ASU 2023-09 is effective for the Company's Annual Report on Form 10-K for the year ended December 31, 2025, with early adoption permitted. The Company has adopted the standard retrospectively, and the enhanced expense disclosures can be found in the 2025 Annual Report.

Recently Issued Accounting Standards Not Yet Adopted

In May 2026, the FASB issued ASU 2026-02, Environmental Credits and Environmental Credit Obligations, (Topic 818). This ASU establishes guidance on the recognition, measurement, presentation, and disclosure of environmental credits and environmental credit obligations. Public business entities are required to apply the guidance retrospectively. The ASU is effective for fiscal years beginning after December 15, 2027, and interim periods within fiscal years beginning after December 15, 2028. The Company is currently evaluating the impact of this standard on its consolidated financial statements.

In November 2024, the FASB issued ASU 2024-03, Income Statement — Reporting Comprehensive Income — Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses. This ASU requires public business entities to disclose, on an annual and interim basis, disaggregated information about certain income statement expense line items. The ASU also requires disclosure of the total amount of selling expenses recognized in continuing operations on an annual and interim basis and disclosure of a public business entity’s definition of selling expenses on an annual basis (or in interim reporting periods if the definition is changed). Public business entities are required to apply the guidance prospectively but are permitted to apply it retrospectively. The ASU is effective for fiscal years beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027. The Company is currently evaluating the impact of this standard on its consolidated financial statements.

NOTE 3 – ASSET IMPAIRMENT

The Company recorded an impairment loss of $650 and $377 for the three months ended June 30, 2026 and 2025, respectively and $1,093 and $2,424 for the six months ended June 30, 2026 and 2025, respectively. All 2026 impairments were for specifically identified discrete or non-operable assets, of which $748 was impaired atfive RNG sites and $345 atone REG site and the Company did not record any impairments related to its cash flows assessment. In 2025, $1,983 was impaired for costs related to a development project RNG interconnection for which the local utility is no longer accepting RNG into its distribution system. All associated costs related to the interconnection were impaired. The remaining 2025 impairments of $441 were for specifically identified assets deemed obsolete or non-operable and consisted of $357 within the RNG segment and $84 within the REG segment.

NOTE 4 – REVENUES FROM CONTRACTS WITH CUSTOMERS

The Company’s revenues are comprised of renewable energy and related Environmental Attribute sales provided under short, medium and long term contracts with its customers. All revenue is recognized when (or as) the Company satisfies its performance obligation(s) under the contract (either implicit or explicit) by transferring the promised product or service to its customer either when (or as) its customer obtains control of the product or service. A performance obligation is a promise in a contract to transfer a distinct product or service to a customer. A contract’s transaction price is allocated to each distinct performance obligation. The Company allocates the contract’s transaction price to each performance obligation using the product’s observable market standalone selling price for each distinct product in the contract. The Company's typical invoicing terms are payment due within 30 days of invoice date.

Revenue is measured as the amount of consideration the Company expects to receive in exchange for transferring its products or services to customers. Revenue is recorded net of allowances and customer discounts. Transportation and gathering costs incurred by customers after the transfer of control of the commodities are netted from revenue, as the Company does not control these services and acts as an agent with respect to such costs. To the extent applicable, sales, value add and other taxes collected from customers and remitted to governmental authorities are accounted for on a net (excluded from revenues) basis. In certain cases, the Company's performance obligation under its sale of RNG contracts include variable components, whose consideration is based on subsequent monetization of environmental attribute credits by third parties. These variable components are recognized over time to the extent it is probable that a significant reversal will not occur.

The Company’s performance obligations related to the sale of renewable energy (i.e. RNG and Renewable Electricity) are generally satisfied over time. Revenue related to the sale of renewable energy is generally recognized over time using an output based upon the product quantity delivered to the customer. This measure is used to best depict the Company’s performance to date under the terms of the contract. Revenue from products transferred to customers over time accounted for approximately 14% and 35% of revenue for the three months ended June 30, 2026 and 2025, respectively, and 17% and 36% for the six months ended June 30, 2026 and 2025, respectively.

The Company’s performance obligations related to the sale of Environmental Attributes are generally satisfied at a point in time and were 86% and 65% of revenue for the three months June 30, 2026 and 2025, respectively, and 83% and 64% for the six months ended June 30, 2026 and 2025, respectively. The Company recognizes Environmental Attribute revenue at the point in time in which the customer obtains control of the Environmental Attributes, which is generally when the title of the Environmental Attribute passes to the customer upon delivery. In limited cases, title does not transfer to the customer and revenue is not recognized until the customer has accepted the Environmental Attributes.

The following tables display the Company’s disaggregated revenue by major source based on product type and timing of transfer of goods and services for the three and six months ended June 30, 2026 and 2025:

Practical expedients and remaining performance obligations

The Company recognizes revenue from the sale of natural gas and electric commodities using the right to invoice practical expedient. The Company determined that the revenues recognized as of period end correspond directly with the value transferred to customers and the Company's satisfaction of the performance obligations to date. The Company has elected the practical expedient available in ASC 606-10-50-14 and ASC 606-10-50-14A and therefore does not disclose the transaction price allocated to remaining performance obligations for contracts with an expected duration of one year or less or for contracts in which variable consideration is allocated to wholly unsatisfied distinct goods that form part of a single performance obligation. The Company’s revenue contracts either qualify for the practical expedients discussed above or have an expected duration of one year or less. As a result, the Company has no remaining performance obligations requiring disclosure as of June 30, 2026 and December 31, 2025.

NOTE 5 – EQUITY METHOD INVESTMENTS

In March 2025, the Company entered into a joint venture, GreenWave Energy Partners, LLC, ("GreenWave"). The investees in the joint venture are Pesta Energy, LLC, a wholly owned subsidiary of the Company, with an ownership percentage of 51% and Pioneer Renewable Energy Marketing, LLC ("PREM"), with an ownership percentage of 49%. Although the Company holds a 51% ownership interest, GreenWave is jointly controlled by each party, and no single entity has the unilateral ability to direct the activities that most significantly impact GreenWave’s economic performance; accordingly, consolidation is not required. As of June 30, 2026, the Company has contributed $4,000. Additionally, the Company provided for a $184 short-term loan. Subject to various and certain requirements as defined in the underlying agreements, the Company could be required to make additional short term loans up to $316. Any additional funding, if required, would be evaluated at the time of funding to determine the appropriate accounting treatment. The Company's maximum exposure to loss in the joint venture as of June 30, 2026 is $3,899, which is comprised of the equity balance of $3,715 and the $184 short-term loan. The joint venture is primarily intended to help address the limited capacity of RNG usage in transportation by dispensing RNG through expanded Transportation Fuel uses under the RFS. While the joint venture is not expected to use RNG produced by the Company, it is expected to provide access to exclusive unique and proprietary pathways for other industry producers of RNG. PREM facilitates access to these pathways and the Company provides for the efficient RIN separation for the joint venture. As part of the agreement, the Company receives separated RINs as distributions. For the six months ended June 30, 2026 and the year ended December 31, 2025, the Company received 2,909 and 706 RINs, respectively, with a with a distribution value of $7,201 and $1,661, respectively. The Company records these distributed RINs within “Prepaid insurance and other current assets” on the Consolidated Balance Sheet, and are valued at the lower of cost or net realizable value. The distributions of separated RINs are accounted for as a return on investment and are recognized based on the Company’s share of GreenWave’s earnings, with any excess distributions treated as a return of investment and recorded as a reduction of the carrying amount of the equity method investment.

The Company utilizes the equity method of accounting related to this joint venture. Refer to Note 2 – Summary of Significant Accounting Policies.

NOTE 6 – ACCOUNTS AND OTHER RECEIVABLES

The Company extends credit based upon an evaluation of the customer’s financial condition and, while collateral is not required, the Company periodically receives surety bonds that guarantee payment. Credit terms are consistent with industry standards and practices. Reserves for uncollectible accounts, if any, are recorded as part of general and administrative expenses in the consolidated statements of operations. No reserve expense was recorded for the three and six months ended June 30, 2026 and 2025.

Accounts and other receivables consist of the following as of June 30, 2026, December 31, 2025 and 2024:

NOTE 7 – PROPERTY, PLANT AND EQUIPMENT, NET

Property, plant and equipment consist of the following as of June 30, 2026 and December 31, 2025:

Depreciation expense for Property, plant and equipment was $7,507 and $6,640 for the three months ended June 30, 2026 and 2025, respectively, and $15,476 and $12,548 for the six months ended June 30, 2026 and 2025, respectively. Depletion expense for gas mineral rights was $91 for both the three months ended June 30, 2026 and 2025, and $182 for both the six months ended June 30, 2026 and 2025.

Construction work in progress consists of RNG and REG capital expenditures on developmental projects and improvements to existing sites. Development projects, on average, last between 18 to 36 months, and when completed for their intended use, costs are placed in service and begin depreciating.

NOTE 8 – GOODWILL AND INTANGIBLE ASSETS, NET

Goodwill and intangible assets consist of the following as of June 30, 2026 and December 31, 2025:

As of June 30, 2026, the weighted average remaining useful lives for both customer contracts and interconnections were 12 years. Amortization expense was $289 and $280 for the three months ended June 30, 2026 and 2025, respectively and $589 and $528 for the six months ended June 30, 2026 and 2025, respectively.

NOTE 9 – ASSET RETIREMENT OBLIGATIONS

The Company accounts for asset retirement obligations by recording the fair value of the liability in the period in which it is incurred. The Company estimates the fair value of asset retirement obligations by calculating the estimated present value of the cost to retire the asset. Factors that are considered when determining the present value of the cost to retire the asset include future inflation and discount rates, along with estimates date(s) of retiring the asset. Additionally, changes in legal, regulatory, environmental, and political environments can affect the fair value of the obligations. As such, asset retirement obligations are considered a level 3 financial instrument.

The following table summarizes the activity associated with asset retirement obligations of the Company as of June 30, 2026 and December 31, 2025:

NOTE 10 – DERIVATIVE INSTRUMENTS

To mitigate market risk associated with fluctuations in interest rates and natural gas commodity prices, the Company will, at times, utilize swap contracts under a board-approved program. The Company does not apply hedge accounting to any of its derivative instruments, and all realized and unrealized gains and losses from changes in derivative values are recognized in earnings each period. As a result of the economic hedging strategies employed, the Company had the following losses in the Consolidated Statements of Operations the three and six months ended June 30, 2026 and 2025:

As of June 30, 2026, the Company hasno interest rate nor commodity swap contracts outstanding.

NOTE 11 – FAIR VALUE OF FINANCIAL INSTRUMENTS

The Company’s assets and liabilities that are measured at fair value on a recurring basis include the following as of June 30, 2026 and December 31, 2025, set forth by level, within the fair value hierarchy:

The three levels of the fair value hierarchy under authoritative guidance are described as follows:

Level 1: Observable inputs that reflect unadjusted quoted market prices in active markets for identical assets or liabilities.

Level 2: Inputs are market data, other than Level 1, that are observable either directly or indirectly. Level 2 inputs include quoted market prices for similar assets or liabilities, quoted market prices for similar assets or liabilities in inactive markets and other observable information that can be corroborated by market data.

Level 3: Unobservable inputs that are not corroborated by market data, but significant to the fair value measurement.

Interest rate swap derivatives are classified as Level 2 financial instruments and are valued utilizing Secured Overnight Financing Rates. The Company's remaining interest rate swaps were settled on March 9, 2026 with a cash gain of $191, due to the debt refinancing and the extinguishment of the prior Comerica debt.

In addition, certain assets are measured at fair value on a non-recurring basis when an indicator of impairment is identified and the assets’ fair values are determined to be less than its carrying value. See Note 3 for additional information.

A summary of changes in the fair value of the Company’s Level 3 instrument, attributable to asset retirement obligations, for the six months ended June 30, 2026 and the year ended December 31, 2025 is included in Note 9.

There wereno transfer of assets or liabilities between Levels 1, 2 or 3 of the fair value hierarchy as of June 30, 2026 and December 31, 2025.

NOTE 12 – ACCRUED LIABILITIES

The Company’s accrued liabilities consist of the following as of June 30, 2026 and December 31, 2025:

NOTE 13 – DEBT

The Company’s debt consists of the following as of June 30, 2026 and December 31, 2025:

New Senior Credit Facility

On March 9, 2026, the Company entered in a new, five year senior credit facility ("New Senior Credit Facility") with CCH1 MEH Lender LLC (a wholly owned subsidiary of Hannon Armstrong Capital LLC “HASI”) that consists of up to $200,000 in senior indebtedness, of which $155,000 is outstanding as of June 30, 2026. These proceeds were used to repay all outstanding debt of the Company at the date of closing. Subject to various requirements as defined in the underlying agreement, the Company expects to have an additional $45,000 in proceeds to draw upon the conclusion of certain engineering review and operational requirements of its Montauk Ag Renewables project in North Carolina. Finally, the Company maintains a cash collateralized facility with an entity not related to the HASI New Senior Credit Facility and has issued $2,185 of letters of credit, for which the Company is required to maintain 105% of cash collateral. The New Senior Credit Facility matures in March 2031. The New Senior Credit Facility includes various affirmative and negative covenants that require the Company to meet specified financial ratios and financial tests, as defined in the underlying agreement. Under the New Senior Credit Facility, the Company is required to maintain:

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Total Net Leverage Ratio (as defined in the New Senior Credit Facility) of not more than 4.00 to 1.00, and

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As of the end of each fiscal quarter, a Fixed Charge Coverage Ratio (as defined in the New Senior Credit Facility) of not less than 1.20 to 1.00, and

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Various other financial covenants or mandatory prepayments (as defined in the New Senior Credit Facility)

The New Senior Credit Facility is subject to customary events of default and contemplates that the Company would be in default if, for any fiscal quarter (x) the average monthly D3 RIN price is less than $1.00 per RIN and (y) the consolidated average quarterly trailing EBITDA over the previous four quarters is less than $10,000.

The New Senior Credit Facility has a 24-month availability period during which only interest is payable quarterly. After the availability period, the Company is required to make quarterly principal payments equal to 1.25% of the total outstanding principal. A final $131,750 payment is due March 2031. The interest rate of the New Senior Credit Facility is 10.25%.

As of December 31, 2025, under the prior credit agreement with Comerica Bank, $44,000 and $85,000 was outstanding under the term loan and revolver, respectively. In addition, the Company had $2,571 of outstanding letters of credit as of December 31, 2025. Amounts available under the revolving credit facility are reduced by any amounts outstanding under letters of credit. As of December 31, 2025, the Company’s capacity available for borrowing under the revolving credit facility was $32,429. Borrowings of the term loan and revolving credit facility bore interest at the Secured Overnight Financing Rate plus an applicable margin. The interest rate as of December 31, 2025 was 6.44%.

Amortized debt issuance expense in the amount of $339 and $99 for the three months ended June 30, 2026 and 2025, respectively and $482 and $195 for the six months ended, June 30, 2026 and 2025, respectively, was recorded in interest expense in the Consolidated Statement of Operations. Due to the cessation of the prior credit agreement, a $944 Loss on extinguishment of debt was recorded in the Consolidated Statement of Operations.

As of June 30, 2026, the Company was in compliance with all applicable financial covenants under the new credit agreement.

NOTE 14 – INCOME TAXES

The Company’s provision for income taxes in interim periods is computed by applying the estimated annual effective tax rates to income or loss before income taxes for the period. In addition, non-recurring or discrete items are recorded during the period in which they occur. For the three and six months ended June 30, 2026, the Company utilized an estimated effective tax rate.

The effective tax rate of 90% for the three months ended June 30, 2026 was higher than the rate for the three months ended June 30, 2025, of (52)% primarily due to the change in our pre-tax book loss year over year.

The effective tax rate of 88% for the six months ended June 30, 2026 was higher than the rate for the six months ended June 30, 2025, of (35)% primarily due to the change in our pre-tax book loss year over year.

Income tax expenses for the three and six months ended June 30, 2026 and June 30, 2025 were calculated using an estimated effective tax rate which differs from the U.S. federal statutory rate of 21% primarily due to the adjustment for production tax credits.

NOTE 15 – SHARE-BASED COMPENSATION

The board of directors of Montauk Renewables adopted the Montauk Renewables, Inc. Equity and Incentive Compensation Plan (“MRI EICP”) in January 2021. Following the closing of the IPO, the board of directors of Montauk Renewables approved the grant of non-qualified stock options, restricted stock units and restricted share awards to the employees of Montauk Renewables and its subsidiaries in January 2021. There is no unrecognized share-based compensation expense related to these awards. Additional share-based compensation awards have been granted by the Board of Directors and issued by the Company to officers and other employees of the Company. Stock compensation expense related to these awards was $516 and $926 for the three months ended June 30, 2026 and 2025, respectively and $1,151 and $1,780 for the six months ended June 30, 2026 and June 30, 2025, respectively.

The restricted shares, restricted stock units and option awards are subject to vesting schedules and are subject to the terms and conditions of the MRI EICP and related award agreements including, in the case of the restricted share awards, each officer having made an election under Section 83(b) of the Code.

In connection with a May 2021 asset acquisition,1,250,000 restricted share awards (“RS Awards”) were granted totwo employees that were hired by the Company in connection with such acquisition. The RS Awards were to vest over a five-year period andsubject to the achievement of time and performance-based vesting criteria over such period. In May 2022, the RS Awards were amended to remove the performance-based vesting criteria and to be only subjected to time-based vesting requirements over a five year period. The awards were revalued at $15,500. Stock compensation expense related to these awards was $0 and $1,442 for the three months ended June 30, 2026 and 2025, respectively and $0 and $1,863 for the six months ended June 30, 2026 and June 30, 2025 respectively. During the second quarter of 2025, the Company recognized $1,550 of noncash stock compensation expense within General and administrative expense related to the acceleration of previously unrecognized stock compensation expense related to an employee termination. As of June 30, 2026, there isno remaining unrecognized MRI EICP compensation expense for these awards.

Options granted under the MRI EICP allow the recipient to receive the Company’s common stock equal to the appreciation in the fair market value of the Company’s common stock between the grant date and the exercise and settlement of options into shares as of the exercise dates. The fair value of the MRI EICP options was estimated using the Black-Scholes option pricing model. The following table provides the weighted-average option assumptions (no dividends were expected):

The following table summarizes the restricted shares, restricted stock units and options outstanding under the MRI EICP as of June 30, 2026 and 2025:

As of June 30, 2026, no vested options have been exercised. Unrecognized MRI EICP compensation expense for awards the Company expects to vest as of June 30, 2026 was $3,756 and will be recognized over approximately 5 years.

NOTE 16 – DEFINED CONTRIBUTION PLAN

The Company maintains a 401(k) defined contribution plan for eligible employees. The Company matches 50% of an employee’s deferrals up to 4%. The Company also contributes 3% of eligible employee’s compensation expense as a safe harbor contribution. The matching contributions vest ratably over four years of service, while the safe harbor contributions vest immediately. Incurred expense related to the 401(k) plan was $244 and $249 for the three months ended June 30, 2026 and 2025, respectively and $488 and $494 for the six months ended June 30, 2026 and 2025, respectively.

NOTE 17 – RELATED PARTY TRANSACTIONS

Related Party Loan

On January 26, 2021, The Company entered into a Loan Agreement and Secured Promissory Note (the “Initial Promissory Note”) with Montauk Holdings Limited (“MNK”). MNK is our affiliate and certain of our directors are also directors of MNK. Pursuant to the Initial Promissory Note, the Company advanced a cash loan of $5,000 to MNK for MNK to pay its dividend's tax liability arising from the Reorganization Transactions under the South African Income Tax Act, 1962 (Act No. 58 of 1962), as amended. As a result of several amendments, the current principal balance of the loan is $10,690, the due date is December 31, 2033 and the security interest is 976,623 shares of our common stock held by MNK (as amended the “Fifth Amended Promissory Note”).

In December 2021, Rivetprops 47 Proprietary Limited (“RP47”) entered into an agreement to loan MNK up to 10,000 South African Rand (the “RP47 Loan”). The principal balance and accrued interest was 11,713 Rand or approximately $650 US Dollars as of December 31, 2024. There was no collateral pledged for this loan. This loan became due on December 31, 2024 (“Maturity Date”) when MNK and RP47 did not extend the maturity of the loan agreement. Associated with a modification on December 31, 2024 of the TIA between us and MNK, we became obligated to repay the RP47 Loan on MNK’s behalf as MNK did not have sufficient funds to repay the RP47 Loan. On February 2, 2025, our Board of Directors approved the repayment of the RP47 Loan under the TIA. On March 5, 2025 and in connection with the Fifth Amended and Restated Loan Agreement and Secured Promissory Note, the Company repaid the RP47 loan as required under the TIA.

Variable Interest Entity

Under ASC 810-10-25-38A and 38B, a reporting entity is deemed to have a controlling financial interest in a VIE if it possesses both of the following characteristics: the power to direct the activities of the VIE that most significantly impact its economic performance, and the obligation to absorb losses of the VIE that could potentially be significant or the right to receive benefits from the VIE that could potentially be significant.

Under ASC 810, the Company determined that MNK is a variable interest entity. The Company does not hold any equity interest in MNK but has entered into the Fifth Amended and Restated Loan Agreement and Secured Promissory Note between the Company and MNK.

Prior to the RP47 Loan repayment, we concluded that RP47, a related party of us through RP47’s ownership of MNK, was the primary beneficiary of MNK under the variable interest entity model. In connection with the modification under the TIA, RP47 retained its power over MNK but no longer held significant benefits in MNK. Substantially all of MNK’s activities are conducted on our behalf as MNK’s only asset is the 976,623 shares of our common stock held as security for the Fifth Amended and Restated Loan Agreement and Secured Promissory Note. MNK’s only obligation is its loan to us and thus, we became the primary beneficiary of MNK on December 31, 2024. In accordance with ASC 810, we consolidated MNK on December 31, 2024. The Fifth Amended Promissory Note became an intercompany loan and was eliminated in consolidation. MNK’s investment of $10,178 in the Company was also eliminated in consolidation. There is no gain or loss on the initial consolidation of MNK as the transaction is a common control transaction. We also recorded a noncash acquisition of Treasury stock ($8,309) related to the consolidation of the 976,623 shares of our common stock collateralizing the Fifth Amended Promissory Note.

As of June 30, 2026, we consolidated MNK’s current assets ($119), current liabilities ($54) and long-term liabilities ($25).

NOTE 18 – SEGMENT INFORMATION

The Company’s reportable segments for the three and six months ended June 30, 2026 and 2025 are Renewable Natural Gas and Renewable Electricity Generation. Renewable Natural Gas includes the production of RNG. Renewable Electricity Generation includes generation of electricity at biogas-to-electricity plants. The Corporate entity is not determined to be an operating segment and though not an operating segment, certain corporate costs are disclosed as reconciling items to the Company’s consolidated results. The following tables are consistent with the manner in which the Chief Executive Officer, who is the Company's chief operating decision maker ("CODM"), evaluates the performance of each segment and allocates the Company's resources. The CODM evaluates the performance of the segments based on segment operating income (loss). The CODM assesses budgeted segment operating income (loss) amounts compared to actual results, which assists in determining future resource allocations of the Company, including allocation of capital expenditures. The CODM uses segment operating income (loss), which is before income taxes, as it measures operational profitability and can be used to evaluate non-financial performance measures including operational production. The Company maintains discrete financial information for its operating sites, which meet the definition of an operating segment, but are aggregated into reportable segments based on the type of commodity produced, as these operating sites have similar economic characteristics, including production processes, customer types and regulatory environments. Total Assets and Capital expenditures by segment are also provided within the tables below, as these amounts are regularly reviewed by the CODM. “RNG” refers to Renewable Natural Gas and “REG” refers to Renewable Electricity Generation.

(2)The majority of other operating expenses for RNG and REG are consumables, rent, environmental compliance and general and administrative expenses.

(3)The majority of operating expenses for Corporate and other are payroll and related expenses of $4,488, insurance of $1,107 and professional and IT fees of $1,274.

(4)The majority of other expense (income) for Corporate and other are interest expense of $1,531 and income from equity investment of ($3,772).

(3)The majority of operating expenses for Corporate and other are payroll and related expenses of $6,296, insurance of $1,186 and professional and IT fees of $977.

(4)The majority of other expense for Corporate and other is interest expense of $1,216.

(3)The majority of operating expenses for Corporate and other are payroll and related expenses of $8,938, insurance of $2,177 and professional and IT fees of $2,991.

(4)The majority of other expense (income) for Corporate and other is interest expense of $2,866 and income from equity investment of ($7,092).

(3)The majority of operating expenses for Corporate and other are payroll and related expenses of $11,454, insurance of $2,517 and professional and IT fees of $2,337.

(4) The majority of other expense for Corporate and other is interest expense of $2,459.

For the three months ended June 30, 2026 and 2025, two and three customers, respectively made up greater than 10% of total revenues.

For both the six months ended June 30, 2026 and 2025, four customers made up greater than 10% of total revenues.

NOTE 19 – LEASES

The Company leases office space and other office equipment under operating lease arrangements (with initial terms greater than twelve months), expiring in various years through 2033. These leases have been entered into to better enable the Company to conduct business operations. Office space is leased to provide adequate workspace for all employees in Pittsburgh, Pennsylvania and Houston, Texas. Landfill site operating leases include gas monitoring devices that serve to improve production efficiencies and alert technicians to issues and safety concerns occurring at the well head. Office space, office equipment and gas monitoring equipment agreements that exceed 12 months are accounted for as operating leases in accordance with ASC 842, Leases.

The Company also leases safety equipment for the various operational sites in the United States. The term of certain equipment exceeds twelve months and is accordingly classified as a finance lease under ASC 842. The finance leases expire in 2026 and were entered into in order to provide a safe work environment for operational employees.

The Company determines if an arrangement is, or contains, a lease at inception based on whether that contract conveys the right to control the use of an identified asset in exchange for consideration for a period of time. For all operating and finance lease arrangements, the Company presents at the commencement date: a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term.

The Company has elected, as a practical expedient, not to separate non-lease components from lease components, and instead account for each separate component as a single lease component for all lease arrangements, as lessee. In addition, the Company has elected, as a practical expedient, not to apply lease recognition requirements to short-term lease arrangements, generally those with a lease term of less than twelve months for all classes of underlying assets. In determination of the lease term, the Company considers the likelihood of lease renewal options and lease termination provisions.

The Company uses its incremental borrowing rate, as the basis to calculate the present value of future lease payments, at lease commencement. The incremental borrowing rate represents the rate of interest a lessee would have to pay to borrow an amount equal to the total lease payments on a collateralized basis over a similar term in a similar economic environment.

Supplemental information related to operating lease arrangements was as follows:

Future minimum operating lease payments are as follows:

Supplemental information related to finance lease arrangements was as follows:

Future minimum finance lease payments are as follows:

NOTE 20 – INCOME (LOSS) PER SHARE

Basic and diluted income (loss) per share was computed using the following common share data for the three and six months ended June 30, 2026 and 2025:

As a result of incurring a net loss for the three and six months ended June 2025, potential common shares of 59,145 and 65,556, respectively, were excluded from diluted loss per share because the effect would have been antidilutive.

NOTE 21 – COMMITMENTS AND CONTINGENCIES

Environmental

The Company is subject to a variety of environmental laws and regulations governing discharges to air and water, as well as the handling, storage and disposing of hazardous or waste materials. The Company believes its operations currently comply in all material respects with all environmental laws and regulations applicable to its business. However, there can be no assurance that environmental requirements will not change in the future or that the Company will not incur significant costs to comply with such requirements.

Litigation Contingencies

The Company, from time to time, may be involved in litigation. At June 30, 2026, Management does not believe there are any matters outstanding that would have a material adverse effect on the Company’s financial position or results of operations.

NOTE 22 – SUBSEQUENT EVENTS

The Company evaluated its June 30, 2026 condensed consolidated financial statements through the date the financial statements were issued. The Company is not aware of any subsequent events which would require recognition or disclosure in the consolidated financial statements.