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(1) Adjusted to reflect the retrospective change in accounting method for planned major maintenance costs as described in Note 1. See Note 12 for reconciliation to previously reported amounts.

(1) Adjusted to reflect the retrospective change in accounting method for planned major maintenance costs as described in Note 1. See Note 12 for reconciliation to previously reported amounts.

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(1) Adjusted to reflect the retrospective change in accounting method for planned major maintenance costs as described in Note 1. See Note 12 for reconciliation to previously reported amounts.

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Arq, Inc., together with its consolidated subsidiaries ("Arq" or the "Company", formerly known as Advanced Emissions Solutions, Inc.) is a Delaware corporation with its principal office located in Greenwood Village, Colorado, with manufacturing, mining and logistics operations located in Louisiana and coal recovery and manufacturing operations located in Kentucky.

The Company is an environmental technology company that is principally engaged in the sale of consumable air, water, and soil treatment solutions, primarily based on activated carbon ("AC"). The Company's proprietary AC products enable customers to reduce air, water, and soil contaminants, including mercury, per and polyfluoroalkyl substances ("PFAS") and other pollutants, to meet the challenges of existing and pending air quality and water regulations. The Company manufactures and sells AC and other chemicals used to capture and remove impurities, contaminants, and pollutants for the coal-fired power generation, industrial, water treatment, and water and soil remediation markets, which are collectively referred to as the advanced purification technologies ("APT") market.

The Company’s primary products are comprised of AC, which is produced from a variety of carbonaceous raw materials. The Company’s AC products include powdered activated carbon ("PAC") and granular activated carbon ("GAC").

The Company owns a lignite coal mine located in Saline, Louisiana (the "Five Forks Mine") that currently supplies the primary raw material for the manufacturing of the majority of the Company’s products at its facility in Coushatta, Louisiana (the "Red River Plant"). In addition, the Company leases land in Corbin, Kentucky, where it holds an idled manufacturing facility (the "Corbin Facility") capable of processing bituminous coal fines into a purified, microfine carbon powder (the "Corbin Wetcake") for high value applications.

Basis of Presentation

The accompanying Condensed Consolidated Financial Statements of Arq are unaudited and have been prepared in conformity with accounting principles generally accepted in the United States ("U.S. GAAP") and with Article 10 of Regulation S-X of the Securities and Exchange Commission. In compliance with those instructions, certain information and footnote disclosures normally included in annual consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted.

The unaudited Condensed Consolidated Financial Statements of Arq in this Quarterly Report on Form 10-Q ("Quarterly Report") are presented on a consolidated basis and include Arq and its wholly-owned subsidiaries. Also included within the unaudited Condensed Consolidated Financial Statements are the Company's unconsolidated equity investments, Tinuum Group, which is accounted for under the equity method of accounting, and Highview Enterprises Limited (the "Highview Investment"), which is accounted for in accordance with U.S. GAAP applicable to equity investments that do not qualify for the equity method of accounting.

Results of operations and cash flows for the interim periods are not necessarily indicative of the results that may be expected for the entire year. All significant intercompany transactions and accounts were eliminated in consolidation for all periods presented in this Quarterly Report.

In the opinion of management, these Condensed Consolidated Financial Statements include all normal and recurring adjustments considered necessary for a fair presentation of the results of operations, financial position, stockholders' equity and cash flows for the interim periods presented. These Condensed Consolidated Financial Statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2025 (the "2025 Form 10-K"). Other than the change in accounting principle discussed below, significant accounting policies disclosed therein have not changed.

Change in Accounting Principle

Effective April 1, 2026, the Company changed its method of accounting for costs incurred in connection with planned major maintenance activities (“turnaround” or "TAR") on its Red River Plant from the direct-expense method to the deferral method. Turnarounds are scheduled and required shutdowns of Red River Plant operations during which the Company performs planned major maintenance activities. Under the deferral method, qualifying costs, including maintenance materials, parts and direct labor directly attributable to the turnaround, are capitalized when incurred and amortized on a straight-line basis over the period until the next scheduled turnaround. Routine repair and maintenance costs are expensed as incurred.

The Company believes that the deferral method is preferable because it better matches qualifying turnaround costs with the periods benefited by the planned major maintenance activities and improves the comparability of the Company’s operating results between periods. Under the direct-expense method previously applied, qualifying turnaround costs were expensed

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entirely in the periods in which they were incurred, although the benefits of the turnaround activities extended through the period until the next scheduled turnaround.

The Company applied the change retrospectively to all periods presented. See Note 12 for additional information regarding the effect of the change in accounting principle.

Loss Per Common Share

Basic loss per common share is computed using the weighted-average number of shares of the Company's common stock outstanding during the reporting period. Diluted loss per common share is computed in a manner consistent with that of loss per common share, while considering the impact of common stock equivalents from other potentially dilutive securities.

For the three and six months ended June 30, 2026 and June 30, 2025, potentially dilutive securities consist of unvested restricted stock awards ("RSAs"), stock options, and contingent performance stock units ("PSUs").

The following table sets forth the calculations of basic and diluted loss per common share:

						Three Months Ended June 30,												Six Months Ended June 30,
(in thousands, except per share amounts)						2026						2025 As Adjusted (1)						2026						2025 As Adjusted (1)
Net loss						$	(733)					$	(2,369)					$	(1,870)					$	(2,402)
Basic weighted-average number of common shares outstanding						42,102						41,507						41,914						41,415
Add: dilutive effect of equity instruments						—						—						—						—
Diluted weighted-average common shares outstanding						42,102						41,507						41,914						41,415
Income (loss) per common share - basic						$	(0.02)					$	(0.06)					$	(0.04)					$	(0.06)
Income (loss) per common share - diluted						$	(0.02)					$	(0.06)					$	(0.04)					$	(0.06)

(1) Adjusted to reflect the retrospective change in accounting method for planned major maintenance costs as described in Note 1. See Note 12 for reconciliation to previously reported amounts.

For the three and six months ended June 30, 2026, potentially dilutive securities of 2.0 million and 2.2 million shares of common stock, respectively, are outstanding but are not included in the calculation of diluted loss per common share because the effect would be anti-dilutive. For the three and six months ended June 30, 2025, potentially dilutive securities of 2.6 million and 2.5 million shares of common stock, respectively, are outstanding but are not included in the calculation of diluted loss per common share because the effect would be anti-dilutive.

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. There have been no changes in the Company's critical accounting estimates from those that were disclosed in the 2025 Form 10-K. Actual results could differ from these estimates.

Fair value measurements

The carrying amounts of the Company's cash, restricted cash, accounts receivable, accounts payable and other current liabilities approximate fair value as recorded due to the short-term nature of these instruments.

Seasonality

The timing of the sale of the Company's consumable products is dependent upon several factors. Power generation is weather dependent, with electricity and steam production varying in response to heating and cooling demands. As a result, the Company's revenue is generally higher in the first and third fiscal quarters during the colder and warmer months of the year. Abnormally high and low temperatures during the summer and winter months, respectively, may significantly increase coal consumption for electricity generation and cause increased impurities within various municipalities' water sources, and thus increase the demand for the Company's products. Additionally, power generating units routinely schedule maintenance outages in the spring and/or fall depending on the operation of their boilers. During such outages, which may range from one week to over a month, the Company's product sales may decrease.

Also, the Company's revenue and sales volumes are highly dependent upon the level of coal consumption at coal-fired power plants, which in turn is significantly affected by the prices of competing power generation sources, such as natural gas and renewables. During periods of low natural gas prices, natural gas provides a competitive alternative to coal-fired power

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generation and therefore, coal consumption for power generation may be reduced, which in turn reduces the demand for the Company's products. In contrast, during periods of higher prices for competing power generation sources, coal consumption generally increases, which generally increases demand for the Company's products.

Demand for the Company's water purification products is driven largely from municipal water treatment facilities. Depending on weather conditions and other environmental factors, the summer months historically have the highest demand for the Company's water treatment products. One of the major uses for PAC is for the treatment of taste and odor impurities caused by organic contaminants and natural materials in water that predominantly degrade during the summer months. Additionally, the rainy season generally results in more demand from water municipalities due to increased contaminated water volume from rain run-off.

Reclassifications

Certain balances have been reclassified from the prior year to conform to the current year presentation. Such reclassifications had no effect on the Company’s results of operations or financial position in any of the periods presented.

New Accounting Standards

Recently Adopted

In July 2025, the FASB issued Accounting Standards Update 2025-05, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets ("ASU 2025-05"). ASU 2025-05 provides a practical expedient that all entities can use when estimating expected credit losses for current accounts receivable and current contract assets arising from transactions accounted for under ASC 606, Revenue from Contracts with Customers. Under this practical expedient, an entity is allowed to assume that the current conditions it has applied in determining credit loss allowances for current accounts receivable and current contract assets remain unchanged for the remaining life of those assets. Entities that elect the practical expedient and, if applicable, make the accounting policy election are required to apply the amendments prospectively. The Company adopted ASU 2025-05 effective January 1, 2026. The adoption of this new accounting standard did not have a material impact on the Company's Condensed Consolidated Financial Statements.

Recently Issued

The following table summarizes the Company's inventories as of June 30, 2026 and December 31, 2025:

						As of
(in thousands)						June 30, 2026						December 31, 2025
Product inventory, net						$	12,634					$	10,403
Raw material inventory						6,773						5,492
Total inventories, net						$	19,407					$	15,895

For the three and six months ended June 30, 2026 and 2025, all material performance obligations related to revenue recognized were satisfied at a point in time.

Trade receivables

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Trade receivables represent an unconditional right to consideration in exchange for goods or services transferred to a customer. The Company invoices its customers in accordance with the terms of the contract. Credit terms are generally net 30 - 45 days from the date of invoice. The timing between the satisfaction of performance obligations and when payment is due from the customer is generally not significant.

Contract assets

Contract assets comprise unbilled receivables from customers and are included in Receivables, net in the Condensed Consolidated Balance Sheets. Unbilled receivables represent a conditional right to consideration in exchange for goods or services transferred to a customer. The Company did not have material unbilled receivables or other contract assets outstanding as of June 30, 2026 and December 31, 2025.

The following table shows the components of the Company's Receivables, net:

						As of
(in thousands)						June 30, 2026						December 31, 2025
Trade receivables, net						$	20,030					$	14,830
Other						—						150
Receivables, net						$	20,030					$	14,980

As of January 1, 2025, Trade receivables, net and Other receivables were $13.3 million and $1.6 million, respectively.

Contract liabilities

Contract liabilities comprise deferred revenue, which represents an obligation to transfer goods or services to a customer for which the Company has received consideration from the customer and, if deliverable within one year or less, are included in "Other current liabilities" in the Condensed Consolidated Balance Sheets and, if deliverable outside of one year, are included in "Other long-term liabilities" in the Condensed Consolidated Balance Sheets. The Company did not have material contract liabilities outstanding as of June 30, 2026 and December 31, 2025.

						As of
(in thousands)						June 30, 2026						December 31, 2025
Revolving credit agreement						$	21,410					$	18,950
CTB Loan due January 2036						8,140						8,403
Finance lease obligations						443						319
Other						936						1,031
						30,929						28,703
Unamortized debt discounts						(23)						(24)
Unamortized debt issuance costs						(202)						(214)
						30,704						28,465
Less: Current maturities						(22,509)						(20,013)
Total long-term debt obligations						$	8,195					$	8,452

Revolving Credit Agreement

In December 2024, the Company and certain of its subsidiaries entered into a credit agreement (the "Revolving Credit Agreement") with MidCap Funding IV Trust (the "Lender"), providing for a five-year $30.0 million secured revolving credit facility (the "Revolving Credit Facility"). Pursuant to the terms of the Revolving Credit Facility, Arq may borrow up to $30.0 million, the availability of which is determined based on a borrowing base equal to percentages of certain eligible equipment, eligible accounts receivable and eligible inventory carrying balances of the Company and certain of its subsidiaries, less applicable reserves established under the Revolving Credit Facility (together, the "Revolving Loan Commitment"), in accordance with a formula set forth in the Revolving Credit Agreement. All borrowings under the Revolving Credit Facility are subject to the satisfaction of customary conditions, including the absence of default, the accuracy of representations and warranties in all material respects and the delivery of an updated borrowing base certificate on a periodic basis. The Company's obligations under the Revolving Credit Facility are secured by first-priority liens on substantially all of the Company's assets, including, without limitation, all inventory, equipment, accounts, intellectual property and other assets, subject to certain negotiated exceptions.

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Borrowings under the Revolving Credit Facility bear interest at the Standard Overnight Financing Rate (SOFR) plus an applicable margin of 4.50% per annum, subject to a SOFR floor of 2.50% per annum. In addition to paying interest on the outstanding loans under the Revolving Credit Facility, the Company is also required to pay an unused line fee equal to 0.50% per annum in respect of unused commitments under the Revolving Credit Facility, a fee for failure to maintain a minimum balance under the Revolving Credit Facility, a collateral management fee equal to 0.25% per annum of the amount outstanding under the Revolving Credit Facility, and certain other customary fees related to the Lender's administration of the Revolving Credit Facility. If the Revolving Loan Commitment is paid down prior to its maturity date, the Company is required to make certain prepayment fees in an amount equal to (i) 2.00% of the terminated amount of the Revolving Loan Commitment in the first year following the Closing Date, (ii) 1.00% of the terminated amount of the Revolving Loan Commitment in the second year following the Closing Date, (iii) 0.50% of the terminated amount of the Revolving Loan Commitment in the third year following the Closing Date and (iv) 0.00% at any time thereafter.

The Revolving Credit Facility contains affirmative and negative covenants customarily applicable to senior secured credit facilities, including, without limitation, covenants that, among other things, require delivery of certain financial statements, projections and reports, require maintenance of property and insurance, limit or restrict the ability of the Company, subject to negotiated exceptions, to incur additional indebtedness and additional liens on their assets, engage in mergers or acquisitions or dispose of assets, pay dividends or make other distributions, voluntarily prepay other indebtedness, enter into transactions with affiliated persons, make investments, and change the nature of their businesses. In addition, the Revolving Credit Facility requires the Company and certain of its subsidiaries party thereto to maintain their aggregate Total Leverage Ratio at or below a maximum leverage ratio and to maintain minimum liquidity of $5.0 million, in each case as specified in the Revolving Credit Facility.

On each of May 6, 2025, December 9, 2025, January 28, 2026, and February 27, 2026, the Company entered into amendments to the Revolving Credit Agreement, all of which provided for, among other things, a revision to the borrowing availability calculation and a reduction in the minimum liquidity requirement for the period beginning May 6, 2025 through March 31, 2026. On March 31, 2026, the Company entered into an amendment to the Revolving Credit Agreement, which provided for, among other things, the replacement of the existing minimum liquidity covenant with a $2.5 million availability reserve requirement, which will increase to $5.0 million beginning in January 2027, the addition of certain eligible equipment and Rolling Stock (as defined in the Revolving Credit Agreement) to the borrowing availability calculation included in the Revolving Credit Agreement, and certain amendments to the definition of Eligible Accounts to allow for higher single customer concentration until August 2026.

As of June 30, 2026, the Company's net borrowings under the Revolving Credit Facility totaled $21.4 million.

CTB Loan

On February 1, 2023, the Company assumed a term loan (the "CTB Loan") with Community Trust Bank, Inc. ("CTB") as lender in the principal amount of $10.0 million held by certain subsidiaries acquired by the Company on that date (the "Borrowers"). The Company initially recorded the CTB Loan at its estimated fair value of $9.7 million, with the difference of $0.3 million between the estimated fair value and the principal amount recorded as a debt discount and recognized as interest expense over the term of the CTB Loan.

The CTB Loan was originally entered into on January 27, 2021 and is comprised of two promissory notes (the "Notes"): (1) "Note A" in the principal amount of $8.0 million, which is guaranteed by the U.S. Department of Agriculture; and (2) "Note B" in the principal amount of $2.0 million. The Notes mature on January 27, 2036 and bear interest at 6.0% per annum through January 2026 and at the prime rate plus 2.75% thereafter. The Company is required to make combined interest and principal payments monthly in the fixed amount of $0.1 million. Interest is computed and payable on the outstanding principal as of the end of the prior month and the balance of the fixed monthly payment amount is applied to the outstanding principal. The Notes may be prepaid without penalty as of January 27, 2026, when the prepayment penalty expired.

The CTB Loan is secured by substantially all assets of the Borrowers and includes among others, the following covenants with respect to the Borrowers, which are tested annually (capitalized terms are defined in the CTB Loan Agreement): (a) Total Indebtedness to Net Worth greater than 4 to 1; (b) Balance Sheet Equity greater than or equal to 20% of the book value of all assets of the Borrowers; (c) (i) net income plus interest, taxes, depreciation and amortization divided by (ii) interest expense plus current maturities on long-term debt greater than or equal to 1.25 to 1.

On March 5, 2026, the Company entered into an amendment to the CTB Loan (the "CTB Second Amendment"). Under the CTB Second Amendment, the lender waived the Company’s obligation to satisfy certain financial covenants for the fiscal year ending December 31, 2025 and suspended financial covenant testing for the fiscal year ending December 31, 2026. As a condition of the waiver, the Company was required to increase its deposits held in reserve at CTB.

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The carrying values of both the Revolving Credit Facility and the CTB Loan approximate their fair values as both instruments bear interest at rates indexed to market rates for similar instruments.

The Company's operating and finance lease right-of-use ("ROU") assets and liabilities as of June 30, 2026 and December 31, 2025 consisted of the following items:

						As of
(in thousands)						June 30, 2026						December 31, 2025
Operating Leases
Operating lease right-of-use assets, net of accumulated amortization (1)						$	5,412					$	6,793
Operating lease obligations, current						$	2,654					$	2,842
Long-term operating lease obligations						4,705						6,086
Total operating lease obligations						$	7,359					$	8,928
Finance Leases
Finance lease right-of-use assets, net of accumulated amortization (2)						$	395					$	276
Finance lease obligations, current						$	248					$	231
Long-term finance lease obligations						195						88
Total finance lease obligations						$	443					$	319

(1) Operating lease ROU assets are reported net of accumulated amortization of $8.0 million and $6.6 million as of June 30, 2026 and December 31, 2025, respectively.

(2) Finance lease ROU assets are reported net of accumulated amortization of $2.6 million and $2.8 million as of June 30, 2026 and December 31, 2025, respectively.

Operating leases

ROU assets under operating leases are included in the "Other long-term assets" line item, and operating lease liabilities are included in "Other current liabilities" and "Other long-term liabilities" line items, respectively, in the Condensed Consolidated Balance Sheets as of June 30, 2026 and December 31, 2025.

Lease expense for operating leases for the three and six months ended June 30, 2026 was $1.3 million and $2.8 million, respectively. Of these amounts, $1.1 million and $2.3 million were included in the "Cost of revenue, exclusive of depreciation and amortization" line item, and $0.2 million and $0.5 million were included in the "Selling, general and administrative" line item in the Condensed Consolidated Statements of Operations for the three and six months ended June 30, 2026, respectively.

Comparatively, lease expense for operating leases for the three and six months ended June 30, 2025 was $1.3 million and $2.4 million, respectively. Of these amounts, $1.0 million and $2.0 million were included in the "Cost of revenue, exclusive of depreciation and amortization" line item, and $0.3 million and $0.4 million were included in the "Selling, general and administrative" line item in the Condensed Consolidated Statements of Operations for the three and six months ended June 30, 2025, respectively.

In 2025, the Company renewed its lease of land where the Corbin Facility is located (the "Corbin Lease") through August 31, 2030 in accordance with the Corbin Lease renewal term, which allows for automatic five-year renewals by the Company. As of December 31, 2025 and based on the Company's decision to idle the Corbin Facility indefinitely, the Company revalued the Corbin Lease liability and the related ROU asset (the "Corbin ROU Asset") based on a reduction from its estimated expected termination date of August 31, 2040, to August 31, 2030. The revaluation resulted in a reduction to both the Corbin Lease Liability and the Corbin ROU Asset in the amount of $0.8 million.

Finance leases

ROU assets under finance leases are included in the "Property, plant and equipment" line item, and finance lease liabilities are included in the "Current portion of long-term debt" and "Long-term debt, net of current portion" line items, respectively, in the Condensed Consolidated Balance Sheets as of June 30, 2026 and December 31, 2025.

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Interest expense related to finance lease obligations and amortization of ROU assets under finance leases are included in the "Interest expense" and "Depreciation, amortization, depletion and accretion" line items, respectively, in the Condensed Consolidated Statements of Operations for the three and six months ended June 30, 2026 and 2025.

Lease financial information as of and for the three and six months ended June 30, 2026 and 2025 is provided in the following table:

						Three Months Ended June 30,												Six Months Ended June 30,
(in thousands)						2026						2025						2026						2025
Finance lease cost:
Amortization of right-of-use assets						$	67					$	101					$	122					$	217
Interest on lease liabilities						26						33						52						71
Operating lease cost						890						924						1,774						1,761
Short-term lease cost						348						259						892						533
Variable lease cost (1)						86						77						163						86
Total lease cost						$	1,417					$	1,394					$	3,003					$	2,668
Other Information:
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from finance leases																		$	52					$	71
Operating cash flows from operating leases																		$	1,562					$	1,162
Financing cash flows from finance leases																		$	117					$	264
Right-of-use assets obtained in exchange for new finance lease liabilities																		$	242					$	—
Right-of-use assets obtained in exchange for new operating lease liabilities																		$	—					$	1,366
Weighted-average remaining lease term - finance leases																		2.9 years						1.0 years
Weighted-average remaining lease term - operating leases																		3.5 years						6.7 years
Weighted-average discount rate - finance leases																		8.8		%				7.0		%
Weighted-average discount rate - operating leases																		9.7		%				11.7		%

(1) Primarily includes common area maintenance, property taxes and insurance payable to lessors.

Surety Bonds and Restricted Cash

As the owner of the Five Forks Mine, the Company is required to post a surety bond with a regulatory commission related to performance requirements associated with the Five Forks Mine. As of June 30, 2026, the amount of this surety bond was $7.5 million.

The Company leases land adjacent to the Corbin Facility and is required to post surety bonds with a regulatory commission for reclamation. As of June 30, 2026, the amount of these surety bonds was $3.0 million.

The Company holds permits for an inactive mine in West Virginia ("Mine 4") and is required to post a surety bond with a regulatory commission for reclamation. As of June 30, 2026, the amount of this surety bond was $0.7 million.

As of June 30, 2026 and December 31, 2025, the Company posted cash collateral of $9.3 million and $8.5 million, respectively, as required by the Company's surety bond providers, which is reported as long-term restricted cash in the Condensed Consolidated Balance Sheets. As of June 30, 2026, the Company holds a deposit of $0.4 million with a third party for collateral as required under a bonding arrangement for Mine 4. This deposit is included in "Other long-term assets, net" in the Condensed Consolidated Balance Sheets as of June 30, 2026.

From time to time, the Company will enter into customer supply agreements which require the Company to obtain performance bonds equal to the annual contract values. The most significant of these was renewed January 1, 2026 and requires the Company to post a performance bond in an amount equal to the annual contract value of $4.0 million. As of June 30, 2026, the

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remaining commitment under this customer contract, which expires on December 31, 2026, was approximately $2.4 million. As of June 30, 2026, the amount of performance bonds outstanding as required by other customer supply agreements was $0.3 million.

The Company currently holds $1.9 million of deposits held in reserve with CTB related to the CTB loan, which is reported as long-term restricted cash in the Condensed Consolidated Balance Sheets as of June 30, 2026.

Tinuum Group

The Company has certain limited obligations contingent upon future events in connection with the activities of Tinuum Group. The Company, along with certain other owners of Tinuum Group, have provided another Tinuum Group owner with limited guarantees (the "Tinuum Group Party Guarantees") related to certain losses it may suffer as a result of inaccuracies or breach of representations and covenants. The Company also is a party to a contribution agreement under which any party called upon to pay on a Tinuum Group Party Guaranty is entitled to receive contribution from the other party equal to 50% of the amount paid. No liability or expense provision has been recorded by the Company related to this contingent obligation as the Company believes that it is not probable that a loss will occur with respect to Tinuum Group Party Guarantees.

Legal Proceedings

The Company is from time to time subject to various pending or threatened legal actions and proceedings, including those that arise in the ordinary course of its business. Such matters are subject to many uncertainties and outcomes, the financial impacts of which are not predictable with assurance and that may not be known for extended periods of time. The Company records a liability in its consolidated financial statements for costs related to claims, settlements and judgments where management has assessed that a loss is probable and an amount can be reasonably estimated.

On February 7, 2025, the Company announced that it had commenced legal proceedings against the firm engaged for design of the GAC facility constructed at the Red River Plant (the "GAC Facility"). The Company believes that the design firm was, among other things, negligent and breached its contract with the Company and as a direct result, the Company suffered material damages including a material increase in costs and time delays associated with the project versus original forecasts. The Company is now seeking to recover damages resulting from such negligence and contractual breaches. On April 11, 2025, the design firm filed a counterclaim to recover certain fees associated with the services provided. Litigation remains ongoing.

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Supplemental Balance Sheet Information

The following table summarizes the components of Prepaid expenses and other current assets and Other long-term assets, net as presented in the Condensed Consolidated Balance Sheets:

						As of
(in thousands)						June 30, 2026						December 31, 2025 As Adjusted (1)
Prepaid expenses and other current assets:
Prepaid expenses						$	3,617					$	2,959
Prepaid lender fees, net (2)						1,418						1,472
Prepaid taxes and tax refunds						143						147
Other						1,716						1,826
Total prepaid expenses and other current assets						$	6,894					$	6,404
Other long-term assets, net:
Spare parts, net						$	11,015					$	11,017
Mine development costs, net						6,618						6,763
Right of use assets, operating leases, net						5,412						6,793
Upfront Customer Consideration (3)						5,279						5,639
Deferred plant turnaround costs, net (4)						2,369						394
Mine reclamation asset, net						1,581						1,645
Intangible assets, net						572						570
Other						2,654						2,680
Total other long-term assets, net						$	35,500					$	35,501

(1) Adjusted to reflect the retrospective change in accounting method for planned major maintenance costs as described in Note 1. See Note 12 for reconciliation to previously reported amounts.

(2) Represents legal and administrative costs incurred to obtain the Revolving Credit Facility. This asset is being amortized on a straight-line basis over the five-year contractual period of the Revolving Credit Facility.

(3) Represents remaining balance on consideration paid to a customer under a long-term supply contract executed in 2020. This asset is being amortized as a reduction to revenue on a straight-line basis over the expected 15-year contractual period of the contract.

(4) Represents costs incurred in connection with planned major maintenance activities, which currently includes maintenance materials, parts and direct labor directly attributable to the Company's plant turnaround in April 2026 for the period ended June 30, 2026, and the trailing deferred plant turnaround costs, net directly attributable to the Company's plant turnaround in April 2024 for the period ended December 31, 2025 (as adjusted). This asset is being amortized on a straight-line basis over the expected two-year period until the Company's next planned turnaround event.

Spare parts include critical spares required to support plant operations.

Mine development costs include acquisition costs, the cost of other development work and mitigation costs related to the Five Forks Mine and are depleted over the estimated life of the related mine reserves.

Mine reclamation asset, net represents an asset retirement obligation ("ARO") asset related to the Five Forks Mine and is depreciated over its estimated life.

As of June 30, 2026 and December 31, 2025, Other includes the Highview Investment in the amount of $0.6 million that is carried at cost, less impairment, plus or minus observable changes in price for identical or similar investments of the same issuer.

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The following table details the components of Other current liabilities and Other long-term liabilities as presented in the Condensed Consolidated Balance Sheets:

						As of
(in thousands)						June 30, 2026						December 31, 2025
Other current liabilities:
Current portion of operating lease obligations						$	2,654					$	2,842
Sales, use and other taxes payable						1,282						1,304
Current portion of mine reclamation liability						1,037						1,037
Other						3,095						1,832
Total other current liabilities						$	8,068					$	7,015
Other long-term liabilities:
Mine reclamation liabilities						$	5,901					$	5,719
Operating lease obligations, long-term						4,705						6,086
Other						—						63
Total other long-term liabilities						$	10,606					$	11,868

As of June 30, 2026 and December 31, 2025, the ARO related to the Five Forks Mine is included in Other long-term liabilities.

The Mine reclamation liabilities represent AROs. Changes in the AROs were as follows:

						As of
(in thousands)						June 30, 2026						December 31, 2025
Asset retirement obligations, beginning of period						$	6,756					$	6,279
Accretion						280						513
Liabilities settled						(98)						(177)
Changes due to scope and timing of reclamation						—						141
Asset retirement obligations, end of period						6,938						6,756
Less current portion						1,037						1,037
Asset retirement obligations, long-term						$	5,901					$	5,719

Supplemental Income Statement Information

Tinuum Group, LLC

As of June 30, 2026 and December 31, 2025, the Company's ownership interest in Tinuum Group, an equity method investment, was 42.5%. For the three and six months ended June 30, 2026, the Company recognized earnings from Tinuum Group of zero and $0.1 million, respectively, in Other income. For the three and six months ended June 30, 2025, the Company recognized earnings from Tinuum Group of zero and $0.2 million, respectively. These amounts are presented as a component of Other income on the Condensed Consolidated Statements of Operations. In 2026, Tinuum Group, LLC has continued to wind down its operations.

For the three and six months ended June 30, 2026, the Company recognized expense of zero and $0.2 million, respectively, in Cost of revenue, exclusive of depreciation and amortization, related to royalties owed to Tinuum Group under an agreement for certain of the Company's sales of M-ProveTM products. Comparatively, for the three and six months ended June 30, 2025, the Company recognized expense of $0.2 million and $0.2 million, respectively, in Cost of revenue, exclusive of depreciation and amortization, related to these royalties.

Tax Asset Protection Plan

U.S. federal income tax rules, and Section 382 of the Internal Revenue Code in particular, could substantially limit the use of net operating losses and tax credits if the Company experiences an "ownership change" (as defined in the Internal Revenue

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Code). In general, an ownership change occurs if there is a cumulative change in the ownership of the Company by "5 percent stockholders" that exceeds 50 percentage points over a rolling three-year period.

An entity that experiences an ownership change generally will be subject to an annual limitation on its pre-ownership change tax loss and credit carryforwards equal to the equity value of the entity immediately before the ownership change, multiplied by the long-term, tax-exempt rate posted monthly by the Internal Revenue Service (subject to certain adjustments). The annual limitation would be increased each year to the extent that there is an unused limitation in a prior year.

On May 5, 2017, the Board approved the declaration of a dividend of rights to purchase Series B Junior Participating Preferred Stock for each outstanding share of common stock as part of a tax asset protection plan (the "TAPP"), which is designed to protect the Company’s ability to utilize its net operating losses and tax credits. The TAPP is intended to act as a deterrent to any person acquiring beneficial ownership of 4.99% or more of the Company’s outstanding common stock.

On April 15, 2026, the Board approved the Ninth Amendment to the TAPP (the "Ninth Amendment"), which amends the TAPP, as previously amended by the First, Second, Third, Fourth, Fifth, Sixth, Seventh, and Eighth Amendments that were approved by the Board on April 6, 2018, April 5, 2019, April 9, 2020, April 9, 2021, March 15, 2022, April 13, 2023, April 12, 2024, and April 8, 2025, respectively. The Ninth Amendment amends the definition of "Final Expiration Date" under the TAPP to extend the duration of the TAPP and makes associated changes in connection therewith. Pursuant to the Ninth Amendment, the Final Expiration Date shall be the close of business on the earlier of (i) December 31, 2027 or (ii) December 31, 2026 if stockholder approval of the Ninth Amendment has not been obtained prior to such date. On June 10, 2026, the Company's stockholders approved the Ninth Amendment, and therefore the Final Expiration Date is the close of business on December 31, 2027, unless the TAPP is further amended.

The Company grants equity-based awards to employees and non-employee directors that may include, but are not limited to, RSAs, PSUs, restricted stock units and stock options. Stock-based compensation expense related to manufacturing employees and administrative employees is included in the "Cost of revenue, exclusive of depreciation and amortization" and "Selling, general and administrative" line items, respectively, in the Condensed Consolidated Statements of Operations. Stock-based compensation expense related to non-employee directors is included in the "Selling, general and administrative" line item in the Condensed Consolidated Statements of Operations.

Total stock-based compensation expense for the three and six months ended June 30, 2026 and 2025 was as follows:

						Three Months Ended June 30,												Six Months Ended June 30,
(in thousands)						2026						2025						2026						2025
RSA expense						$	852					$	522					$	1,493					$	1,041
PSU expense						131						152						321						309
Stock option expense						60						60						120						120
Total stock-based compensation expense						$	1,043					$	734					$	1,934					$	1,470

The amount of unrecognized compensation cost as of June 30, 2026, and the expected weighted-average period over which the cost will be recognized is as follows:

						As of June 30, 2026
(in thousands, except years)						Unrecognized Compensation Cost						Expected Weighted- Average Period of Recognition (in years)
RSA expense						$	2,198					1.60
PSU expense						431						1.26
Stock option expense						11						0.05
Total unrecognized stock-based compensation expense						$	2,640					1.54

Restricted Stock Awards

RSAs are typically granted with vesting terms of three years. The fair value of RSAs is determined based on the closing price of the Company's common stock on the authorization date of the grant multiplied by the number of shares subject to the stock award. Compensation expense for RSAs is generally recognized on a straight-line basis over the entire vesting period.

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A summary of RSA activity under the Company's various stock compensation plans for the six months ended June 30, 2026 is presented below:

						Restricted Stock												Weighted-Average Grant Date Fair Value
Non-vested at January 1, 2026						1,068,649												$	4.97
Granted						100,000												$	2.08
Vested						(426,270)												$	4.50
Forfeited						(58,870)												$	5.29
Non-vested at June 30, 2026						683,509												$	4.82

Performance Share Units

Compensation expense for PSUs is recognized on a straight-line basis over the applicable service period, which is generally three years, based on the estimated fair value at the date of grant. The estimated fair value at the date of grant is determined using a Monte Carlo simulation model for those PSUs with market-based performance conditions. A summary of PSU activity for the six months ended June 30, 2026 is presented below:

						Units						Weighted-Average Grant Date Fair Value						Aggregate Intrinsic Value (in thousands)						Weighted-Average Remaining Contractual Term (in years)
PSUs outstanding at January 1, 2026						811,293						$	3.34
Granted						45,504						$	2.30
Vested / Settled (1)						(193,148)						$	2.48
Forfeited / Canceled						(67,925)						$	6.62
PSUs outstanding at June 30, 2026						595,724						$	3.17					$	1,519					1.23

(1) The number of units shown in the table above is based on target performance. The final number of shares of common stock issued may vary depending on the achievement of market or performance conditions established within the awards, which could result in the actual number of shares issued ranging from zero to a maximum of two times the number of units shown in the above table. For the six months ended June 30, 2026, 136,408 shares of common stock were issued upon vesting of PSUs, net of shares withheld for settlement of payroll tax withholding obligations.

Stock Options

Stock options vest over three years and have a contractual limit of ten years from the date of grant to exercise. The fair value of stock options granted is determined on the date of grant using the Black-Scholes option pricing model, and the related expense is recognized on a straight-line basis over the entire vesting period. The determination of the grant date fair value of stock options issued is affected by a number of variables, including the fair value of the Company’s common stock, the expected common stock price volatility over the expected term of the stock option, the expected term of the stock option, risk-free interest rates, and the expected dividend yield of the Company’s common stock.

Risk-free interest rate - The risk-free interest rate for stock options granted was determined by using a zero-coupon U.S. Treasury rate for the periods that coincided with the expected term of the options.

Dividend yield - An expected dividend yield of zero was included in the calculations, as the Company does not currently pay nor does it anticipate paying dividends on its common stock as of the grant date of the stock options.

Expected volatility - To calculate expected volatility, the historical volatility of the Company's common stock was used.

Expected term - The Company’s expected term of stock options was calculated using a simplified method whereby the midpoint between the vesting date and the end of the contractual term is utilized to compute the expected term, as the Company does not have sufficient historical data for options with similar vesting and contractual terms.

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A summary of stock option activity for the six months ended June 30, 2026 is presented below:

						Number of Options Outstanding and Exercisable						Weighted-Average Exercise Price						Aggregate Intrinsic Value (in thousands)						Weighted-Average Remaining Contractual Term (in years)
Options outstanding at January 1, 2026						1,000,000						$	3.00
Options granted						—						—
Options exercised						—						—
Options expired / forfeited						—						—
Options outstanding at June 30, 2026						1,000,000						$	3.00					$	—					7.05
Options vested and exercisable at June 30, 2026						666,666						$	3.00					$	—					7.05

For the three and six months ended June 30, 2026 and 2025, the Company's income tax expense and effective tax rates are presented below:

						Three Months Ended June 30,												Six Months Ended June 30,
(in thousands, except for rate)						2026						2025						2026						2025
Income tax expense						$	—					$	—					$	—					$	—
Effective tax rate						—		%				—		%				—		%				—		%

The Company recognized pretax losses for the three and six months ended June 30, 2026, and for the three and six months ended June 30, 2025, but recognized no income tax benefit due to the recording of a full valuation allowance on its deferred tax assets. As a result, the effective rate for the three and six months ended June 30, 2026 and 2025 was zero.

The Company assesses a valuation allowance recorded against deferred tax assets at each reporting date. The determination of whether a valuation allowance for deferred tax assets is appropriate requires the evaluation of positive and negative evidence that can be objectively verified. Consideration must be given to all sources of taxable income available to realize deferred tax assets, including, as applicable, the future reversal of existing temporary differences, future taxable income forecasts exclusive of the reversal of temporary differences and carryforwards, taxable income in carryback years and tax planning strategies. In estimating income taxes, the Company assesses the relative merits and risks of the appropriate income tax treatment of transactions taking into account statutory, judicial and regulatory guidance.

Overall

The Company has one reportable segment – advanced purification technologies or "APT." The APT segment primarily manufactures and sells AC-based environmental remediation products, comprised of PAC and GAC, and other chemicals used to capture and remove contaminants for coal-fired power generation, industrial, municipal water and air, water, and soil treatment and remediation markets. The Company derives revenue primarily in the U.S. and manages the business activities on a consolidated basis. The Company manufactures the majority of its finished goods at the Red River Plant.

The Company's chief executive officer is its chief operating decision maker ("CODM"). The CODM assesses performance for the APT segment and decides how to allocate resources based on net loss that also is reported on the Condensed Consolidated Statements of Operations as consolidated net loss. The measure of segment assets is reported on the Condensed Consolidated Balance Sheets as total consolidated assets.

The CODM uses net loss to evaluate income generated from APT assets (return on assets) in deciding how to allocate cash flows from operations within the APT segment. Net loss is used to monitor budget versus actual operating results in assessing performance of the APT segment.

The level of detail used in reviewing operating financial performance and managing the business is contained in the Company's Condensed Consolidated Statements of Operations.

Products and services

The Company operates in one segment, APT, and all revenue reported represents sales of APT products to external customers and are presented in the Condensed Consolidated Statements of Operations.

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Geographic areas

The Company is domiciled in the U.S. The table below shows revenue by country for the three and six months ended June 30, 2026 and 2025.

						Three Months Ended June 30,												Six Months Ended June 30,
(in thousands)						2026						2025						2026						2025
United States						$	28,252					$	27,335					$	54,430					$	51,940
Canada						1,631						1,249						4,506						3,891
Total						$	29,883					$	28,584					$	58,936					$	55,831

Effective April 1, 2026, the Company changed its method of accounting for costs incurred in connection with planned major maintenance activities, or “turnarounds”, on its Red River Plant from the direct-expense method to the deferral method. The Company retrospectively applied this change in accounting principle to all prior periods resulting in a cumulative effect adjustment at January 1, 2025 to increase Other long-term assets, net and Retained earnings by $1.3 million. The impact of this change on certain financial statement line items in the Condensed Consolidated Statements of Operations for the three and six months ended June 30, 2026 and the Condensed Consolidated Balance Sheets as of June 30, 2026, were as follows:

(in thousands, except per share data)						As Computed (using Direct-Expense Method)						Effect of Change						As Reported (using Deferral Method)
Condensed Consolidated Statements of Operations, three months ended June 30, 2026
Cost of revenue, exclusive of depreciation and amortization						$	20,140					$	(1,768)					$	18,372
Depreciation, amortization, depletion and accretion						3,228						314						3,542
Net loss						(2,187)						1,454						(733)
Loss per common share - basic						(0.05)						0.03						(0.02)
Loss per common share - diluted						(0.05)						0.03						(0.02)
Condensed Consolidated Statements of Operations, six months ended June 30, 2026
Cost of revenue, exclusive of depreciation and amortization						$	39,254					$	(1,768)					$	37,486
Depreciation, amortization, depletion and accretion						5,798						609						6,407
Net loss						(3,029)						1,159						(1,870)
Loss per common share - basic						(0.07)						0.03						(0.04)
Loss per common share - diluted						(0.07)						0.03						(0.04)
Condensed Consolidated Balance Sheets, as of June 30, 2026
Inventories, net						$	20,223					$	(816)					$	19,407
Other long-term assets, net						33,131						2,369						35,500
Retained earnings						10,795						1,553						12,348

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Certain financial statement line items in our Condensed Consolidated Statements of Operations for the three and six months ended June 30, 2025 and the Condensed Consolidated Balance Sheets as of December 31, 2025 were adjusted as follows:

(in thousands, except per share data)						As Previously Reported						Effect of Change						As Adjusted
Condensed Consolidated Statements of Operations, three months ended June 30, 2025
Depreciation, amortization, depletion and accretion						$	2,485					$	236					$	2,721
Net loss						(2,133)						(236)						(2,369)
Loss per common share - basic						(0.05)						(0.01)						(0.06)
Loss per common share - diluted						(0.05)						(0.01)						(0.06)
Condensed Consolidated Statements of Operations, six months ended June 30, 2025
Depreciation, amortization, depletion and accretion						$	4,666					$	472					$	5,138
Net loss						(1,930)						(472)						(2,402)
Loss per common share - basic						(0.05)						(0.01)						(0.06)
Loss per common share - diluted						(0.05)						(0.01)						(0.06)
Condensed Consolidated Balance Sheets, as of December 31, 2025
Other long-term assets, net						$	35,107					$	394					$	35,501
Retained earnings						13,824						394						14,218

Unless disclosed elsewhere in the notes to the Condensed Consolidated Financial Statements, there were no significant matters that occurred subsequent to June 30, 2026.

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