1.ESTABLISHMENT, OBJECTIVES AND DURATION.

(a)Establishment of the Plan. Arq, Inc. hereby establishes an incentive compensation plan to be known as the "Arq, Inc. 2024 Omnibus Incentive Plan." The Plan permits the granting of Nonqualified Stock Options, Incentive Stock Options, Stock Appreciation Rights, Restricted Stock, Restricted Stock Units, Performance Stock Units, Other Stock-Based Awards and Cash-Based Awards. The Plan is effective as of June 10, 2024 (the "Effective Date"), subject to the approval of the Plan by the stockholders of the Company. Definitions of capitalized terms used in the Plan are contained in the attached Glossary, which is an integral part of the Plan.

(b)Objectives of the Plan. The objectives of the Plan are to attract and retain the best available personnel for positions of substantial responsibility, to provide additional incentive to Participants and to optimize the profitability and growth of the Company through incentives that are consistent with the Company’s goals and that link the personal interests of Participants to those of the Company’s stockholders. The Plan is further intended to provide flexibility to the Company in its ability to motivate, attract, and retain the services of Participants who make or are expected to make significant contributions to the Company’s success and to allow Participants to share in the success of the Company.

(c)Duration of the Plan. No Award may be granted under the Plan after the day immediately preceding the 10th anniversary of the Effective Date, or such earlier date as the Board shall determine. The Plan will remain in effect with respect to outstanding Awards until no Awards remain outstanding.

2.ADMINISTRATION OF THE PLAN.

(a)The Committee. The Plan shall be administered by the Compensation Committee of the Board or such other committee as the Board shall designate consisting of two or more members of the Board each of whom is intended to be a "non-employee director" within the meaning of Rule 16b-3 (or any successor rule) of the Exchange Act and an "independent director" under the Nasdaq Marketplace Rules or the rules of any securities exchange on which Shares are listed (such committee, the "Committee"). The members of the Committee shall be appointed from time to time by, and shall serve at the discretion of, the Board.

(b)Authority of the Committee. Subject to Applicable Laws and the provisions of the Plan (including any other powers given to the Committee hereunder), and except as otherwise provided by the Board, the Committee shall have full and final authority in its discretion to take all actions determined by the Committee to be necessary in the administration of the Plan, including discretion to:

i.select the Employees, Directors and Consultants to whom Awards may from time to time be granted hereunder;

ii.determine whether and to what extent Awards are granted hereunder;

iii.determine the size and types of Awards granted hereunder;

iv.approve forms of Award Agreement for use under the Plan;

v.determine the terms and conditions of any Award granted hereunder;

vi.establish performance goals and performance measures for any performance period, adjust performance goals or measures, or the assessment of any performance goals or measures, applicable to any Award, including to account for any unusual in nature or infrequently occurring items, and determine whether such goals or measures were satisfied; vii.amend the terms of any outstanding Award granted under the Plan, provided that, except as otherwise provided in Section 17, no such amendment shall reduce the Exercise Price of outstanding Options or the grant price of outstanding SARs without the approval of the stockholders of the Company, and provided further, that any amendment that would materially and adversely affect the Participant’s rights under an outstanding vested Award without adequate compensation therefor shall not be made without the Participant’s written consent;

viii.construe and interpret the terms of the Plan and any Award Agreement entered into under the Plan, and to decide all questions of fact arising in its application; and

ix.take such other action, not inconsistent with the terms of the Plan, as the Committee deems appropriate.

As permitted by Applicable Laws, the Committee may delegate its authority as identified herein, including the power and authority to make Awards to Participants who are not "insiders" subject to Section 16(b) of the Exchange Act, pursuant to such conditions and limitations as the Committee may establish.

(c)Effect of Committee’s Decision. All decisions, determinations and interpretations of the Committee shall be final, binding and conclusive on all persons, including the Company, its Subsidiaries, its stockholders, Employees, Directors, Consultants and their estates and beneficiaries.

3.SHARES SUBJECT TO THE PLAN.

(a)Number of Shares Available for Grants. Subject to adjustment as provided in Section 17 hereof, the maximum number of Shares that may be issued pursuant to Awards under the Plan shall be 2,500,000 plus (i) any Shares that remain available for grant under the Prior Plans as of the date of stockholder approval of this Plan and (ii) any Shares that become available for issuance under the Plan pursuant to Section 3(b). The Shares to be issued pursuant to the Awards may be authorized but unissued Shares or treasury Shares.

(b)Availability of Shares. Any Shares subject to an Award granted under the Plan or under a Prior Plan that is subsequently canceled, forfeited, or expires prior to exercise or realization, whether in full or in part, will again be available and counted for purposes of determining the maximum number of Shares available for Awards under the Plan under Section 3(a). Notwithstanding the foregoing, Shares subject to an Award shall not be available again for issuance or delivery under the Plan if such Shares were (a) tendered or withheld in payment of the Exercise Price of an Option; (b) covered by, but not issued upon settlement of, stock-settled SARs; (c) delivered to, or withheld by, the Company to satisfy any tax withholding obligation, or (d) purchased on the open market with Option proceeds. If an Award, by its terms, may only be settled in cash, then the grant, vesting, payout, settlement, or forfeiture of such Award shall have no impact on the number of Shares available for grant under the Plan.

(c)Limitations on Awards. Subject to adjustment as provided in Section 17, the following additional limitations are imposed under the Plan:

i.Incentive Stock Options. The aggregate number of Shares that may be issued pursuant to the exercise of Incentive Stock Options granted under this Plan shall not exceed 2,500,000, which number shall be calculated and adjusted pursuant to Section 17 only to the extent that such calculation or adjustment will not affect the status of any Option intended to qualify as an Incentive Stock Option under Section 422 of the Code.

ii.Minimum Vesting Requirements. Except for Awards with respect to 5% of the Shares authorized for issuance under the Plan, all Awards granted under the Plan must be granted with a minimum vesting period of at least one year without providing for incremental vesting during such one-year period.

iii.Limit on Director Compensation. The aggregate dollar value of equity-based compensation (based on the grant date fair value) and cash compensation granted under the Plan or otherwise to any Director shall not exceed $350,000 during any calendar year; provided, however, that in the calendar year in which a Director first joins the Board or during any calendar year in which a Director is designated as Chairman of the Board or Lead Director, the maximum aggregate dollar value of equity-based and cash compensation granted to the Director may be up to $400,000.

4.ELIGIBILITY AND PARTICIPATION.

(a)Eligibility. Persons eligible to participate in the Plan include all Employees, Directors and Consultants.

(b)Actual Participation. Subject to the provisions of the Plan, the Committee may, from time to time, select from all eligible Employees, Directors and Consultants, those to whom Awards shall be granted and shall determine the nature and amount of each Award. The Committee may establish additional terms, conditions, rules or procedures to accommodate the rules or laws of applicable foreign jurisdictions and to afford Participants favorable treatment under such laws; provided, however, that no Award shall be granted under any such additional terms, conditions, rules or procedures with terms or conditions which are inconsistent with the provisions of the Plan.

5.TYPES OF AWARDS.

(a)Type of Awards. Awards under the Plan may be in the form of Options (both Nonqualified Stock Options and Incentive Stock Options), Stock Appreciation Rights (SARs), Restricted Stock, Restricted Stock Units, Performance Stock Units, Other Stock-Based Awards and Cash-Based Awards.

(b)Designation of Award. Each Award shall be designated in the Award Agreement.

6.OPTIONS.

(a)Grant of Options. Subject to the terms and provisions of the Plan, Options may be granted to Participants in such number and upon such terms, and at any time and from time to time, as shall be determined by the Committee. Notwithstanding the preceding sentence, Incentive Stock Options may be granted only to eligible Employees.

(b)Award Agreement. Each Option grant shall be evidenced by an Award Agreement that shall specify the Exercise Price, the duration of the Option, the number of Shares to which the Option pertains, and such other provisions as the Committee shall determine including the Option vesting schedule, repurchase provisions, rights of first refusal, forfeiture provisions, form of payment (cash, Shares, or other consideration) upon settlement of the Award, and payment contingencies. The Award Agreement also shall specify whether the Option is intended to be an Incentive Stock Option or a Nonqualified Stock Option. Options that are intended to be Incentive Stock Options shall be subject to the limitations set forth in Section 422 of the Code.

(c)Exercise Price. Except for Options adjusted pursuant to Section 17 herein, and replacement Options granted in connection with a merger, acquisition, reorganization or similar transaction, the Exercise Price for each grant of an Option shall not be less than 100% of the Fair Market Value of a Share on the date the Option is granted.

i.Notwithstanding the above, in the case of an Incentive Stock Option granted to a Participant who, at the time the Option is granted, owns stock representing more than 10% of the voting power of all classes of stock of the Company or any Subsidiary, the Exercise Price for each grant of an Option shall not be less than 110% of the Fair Market Value of a Share on the date the Option is granted.

ii.In addition, the aggregate Fair Market Value, as of the date of grant, of the Shares with respect to which an Incentive Stock Option first becomes exercisable during any calendar year may not exceed $100,000. For purposes of this $100,000 limit, the Participant’s Incentive Stock Options under this Plan and all other plans maintained by the Company and its Subsidiaries shall be aggregated. To the extent any Incentive Stock Option would exceed this $100,000 limit, the Incentive Stock Option shall afterwards be treated as a Nonqualified Stock Option for all purposes.

(d)Term of Options. The term of an Option granted under the Plan shall be determined by the Committee, in its sole discretion; provided, however, that such term shall not exceed 10 years. However, in the case of an Incentive Stock Option granted to a Participant who, at the time the Option is granted, owns stock representing more than 10% of the voting power of all classes of stock of the Company or any Subsidiary, the term of the Incentive Stock Option shall be five years from the date of grant thereof or such shorter term as may be provided in the Award Agreement.

(e)Exercise of Options. Options granted under this Section 6 shall be exercisable at such times and be subject to such restrictions and conditions as set forth in the Award Agreement and as the Committee shall in each instance approve, subject to the minimum vesting requirements in Section 3(c)(ii). Such restrictions and conditions need not be the same for each grant or for each Participant.

(f)Payments. Options granted under this Section 6 shall be exercised by the delivery of a written notice to the Company, setting forth the number of Shares with respect to which the Option is to be exercised and specifying the method of the Exercise Price. The Exercise Price of an Option shall be payable to the Company: (i) in cash or its equivalent, (ii) by tendering (either actually or constructively by attestation) Shares having an aggregate Fair Market Value at the time of exercise equal to the Exercise Price, (iii) in any other manner then permitted by the Committee, including a cashless exercise, or (iv) by a combination of any of the permitted methods of payment. The Committee may limit any method of payment, other than that specified under (i), for administrative convenience, to comply with Applicable Laws or otherwise.

(g)Restrictions on Share Transferability. The Committee may impose such restrictions on any Shares acquired pursuant to the exercise of an Option granted under this Section 6 as it may deem advisable, including restrictions under applicable federal securities laws, under the requirements of any stock exchange or market upon which such Shares are then listed and/or traded, and under any blue sky or state securities laws applicable to such Shares.

(h)Termination of Employment or Service. Each Participant’s Award Agreement shall set forth the extent to which the Participant shall have the right to exercise the Option following termination of the Participant’s employment or, if the Participant is a Director or Consultant, service with the Company and its Subsidiaries. Such provisions shall be determined in the sole discretion of the Committee, need not be uniform among all Options, and may reflect distinctions based on the reasons for termination of employment or service.

7.STOCK APPRECIATION RIGHTS.

(a)Grant of SARs. Subject to the terms and provisions of the Plan, SARs may be granted to Participants in such amounts and upon such terms, and at any time and from time to time, as shall be determined by the Committee.

(b)Award Agreement. Each SAR grant shall be evidenced by an Award Agreement that shall specify the grant price, the term of the SAR, and such other provisions as the Committee shall determine.

(c)Grant Price. The grant price of a SAR shall not be less than 100% of the Fair Market Value of a Share on the date of grant of the SAR; provided, however, that this limitation shall not apply to Awards that are adjusted pursuant to Section 17 herein.

(d)Term of SARs. The term of an SAR granted under the Plan shall be determined by the Committee, in its sole discretion; provided, however, that such term shall not exceed 10 years.

(e)Exercise of SARs. SARs may be exercised upon whatever terms and conditions the Committee, in its sole discretion, imposes upon them and sets forth in the Award Agreement, subject to the minimum vesting requirements in Section 3(c)(ii). Such terms and conditions need not be the same for each grant or for each Participant.

(f)Payment of SAR Amount. Upon exercise of an SAR, a Participant shall be entitled to receive payment from the Company in an amount determined by multiplying:

i.the difference between the Fair Market Value of a Share on the date of exercise over the grant price; by

ii.the number of Shares with respect to which the SAR is exercised.

At the discretion of the Committee, the payment upon SAR exercise may be in cash, in Shares of equivalent value, or in some combination thereof.

(g)Termination of Employment or Service. Each SAR Award Agreement shall set forth the extent to which the Participant shall have the right to exercise the SAR following termination of the Participant’s employment or, if the Participant is a Director or Consultant, service with the Company and its Subsidiaries. Such provisions shall be determined in the sole discretion of the Committee, need not be uniform among all SARs, and may reflect distinctions based on the reasons for termination of employment or service.

8.RESTRICTED STOCK.

(a)Grant of Restricted Stock. Subject to the terms and provisions of the Plan, Restricted Stock may be granted to Participants in such amounts and upon such terms, and at any time and from time to time, as shall be determined by the Committee.

(b)Award Agreement. Each Restricted Stock grant shall be evidenced by an Award Agreement that shall specify the Period(s) of Restriction, the number of Shares of Restricted Stock granted, and such other provisions as the Committee shall determine.

(c)Period of Restriction and Other Restrictions. The Period of Restriction applicable to an Award of Restricted Stock may, at the discretion of the Committee, lapse on a pro-rated, graded, or cliff basis (as specified in an Award Agreement), subject to the minimum vesting requirements in Section 3(c)(ii). The Committee shall impose such other conditions and/or restrictions on any Shares of Restricted Stock granted pursuant to the Plan as it may deem advisable including a requirement that Participants pay a stipulated purchase price for each Share of Restricted Stock, a requirement that the issuance of Shares of Restricted Stock be delayed, restrictions based upon the achievement of specific performance goals, additional time-based restrictions, and/or restrictions under Applicable Laws or under the requirements of any stock exchange or market upon which such Shares are listed or traded, or holding requirements or sale restrictions placed on the Shares by the Company upon vesting of such Restricted Stock. The Company may retain in its custody any certificate evidencing the Shares of Restricted Stock and place thereon a legend and institute stop-transfer orders on such Shares, and the Participant shall be obligated to sign any stock power requested by the Company relating to the Shares to give effect to the forfeiture provisions of the Restricted Stock.

(d)Removal of Restrictions. Subject to Applicable Laws, Restricted Stock shall become freely transferable by the Participant after the last day of the Period of Restriction applicable thereto. Once Restricted Stock is released from the restrictions, the Participant shall be entitled to receive a certificate or book entry on the Company’s records evidencing the Shares.

(e)Voting Rights. Unless otherwise determined by the Committee and set forth in a Participant’s Award Agreement, to the extent permitted or required by Applicable Laws, as determined by the Committee, Participants holding Shares of Restricted Stock granted hereunder may exercise full voting rights with respect to those Shares during the Period of Restriction.

(f)Dividends and Other Distributions. Regular cash Dividends paid with respect to the Shares of Restricted Stock will be subject to the same restrictions on transferability and vesting as the Restricted Stock with respect to which they were paid, and such Dividends will be paid within 30 days following the full vesting of the Shares of Restricted Stock with respect to which such distributions were made.

(g)Termination of Employment or Service. Each Award Agreement shall set forth the extent to which the Participant shall have the right to retain unvested Restricted Stock following termination of the Participant’s employment or, if the Participant is a Director or Consultant, service with the Company and its Subsidiaries. Such provisions shall be determined in the sole discretion of the Committee, need not be uniform among all Awards of Restricted Stock, and may reflect distinctions based on the reasons for termination of employment or service.

9.RESTRICTED STOCK UNITS.

(a)Grant of Restricted Stock Units. Subject to the terms and provisions of the Plan, Restricted Stock Units may be granted to Participants in such amounts and upon such terms, and at any time and from time to time, as shall be determined by the Committee.

(b)Award Agreement. Each grant of Restricted Stock Units shall be evidenced by an Award Agreement that shall specify the applicable Period of Restriction, the number of Restricted Stock Units granted, and such other provisions as the Committee shall determine.

(c)Period of Restriction. The Period of Restriction subject to an Award of Restricted Stock Units may, at the discretion of the Committee, lapse on a pro-rated, graded, or cliff basis, subject to the minimum vesting requirements in Section 3(c)(ii). The Committee shall impose such other conditions and/or restrictions on any Restricted Stock Units granted pursuant to the Plan as it may deem advisable, including a requirement that the issuance of Shares upon vesting of the Restricted Stock Units be delayed, restrictions based upon the achievement of specific performance goals, additional time-based restrictions, and/or restrictions under Applicable Laws or under the requirements of any stock exchange or market upon which such Shares are listed or traded, or holding requirements or sale restrictions placed on the Shares by the Company upon vesting of such Restricted Stock Units.

(d)Form and Timing of Payment. Except as otherwise provided in Section 17 herein or a Participant’s Award Agreement, payment of Restricted Stock Units shall be made at a specified settlement date that shall not be earlier than the last day of the Period of Restriction. The Committee, in its sole discretion, may pay earned Restricted Stock Units by delivery of Shares or by payment in cash of an amount equal to the Fair Market Value of such Shares (or a combination thereof). The Committee may provide that settlement of Restricted Stock Units shall be deferred, on a mandatory basis or at the election of the Participant, in compliance with Applicable Laws, including Section 409A.

(e)Voting Rights. A Participant shall have no voting rights with respect to any Restricted Stock Units granted hereunder.

(f)Termination of Employment or Service. Each Award Agreement shall set forth the extent to which the Participant shall have the right to receive a payout respecting an Award of Restricted Stock Units following termination of the Participant’s employment or, if the Participant is a Director or Consultant, service with the Company and its Subsidiaries. Such provisions shall be determined in the sole discretion of the Committee, need not be uniform among all Restricted Stock Units, and may reflect distinctions based on the reasons for termination of employment or service.

10.PERFORMANCE STOCK UNITS.

(a)Grant of Performance Stock Units. Subject to the terms and provisions of the Plan, Performance Stock Units may be granted to Participants in such amounts and upon such terms, and at any time and from time to time, as shall be determined by the Committee.

(b)Award Agreement. Each grant of Performance Stock Units shall be evidenced by an Award Agreement that shall specify the applicable performance period(s) and performance measure(s), the number of Performance Stock Units granted, and such other provisions as the Committee shall determine; provided, however, that the performance shall be for a period of at least one (1) year.

(c)Form and Timing of Payment. Except as otherwise provided in Section 17 herein or a Participant’s Award Agreement, payment of Performance Stock Units shall be made at a specified settlement date. The Committee, in its sole discretion, may pay earned Performance Stock Units by delivery of Shares or by payment in cash of an amount equal to the Fair Market Value of such Shares (or a combination thereof). The Committee may provide that settlement of Performance Stock Units shall be deferred, on a mandatory basis or at the election of the Participant, in compliance with Applicable Laws, including Section 409A.

(d)Voting Rights. A Participant shall have no voting rights with respect to any Performance Stock Units granted hereunder.

(e)Termination of Employment or Service. Each Award Agreement shall set forth the extent to which the Participant shall have the right to receive a payout respecting an Award of Performance Stock Units following termination of the Participant’s employment or, if the Participant is a Consultant, service with the Company and its Subsidiaries. Such provisions shall be determined in the sole discretion of the Committee, need not be uniform among all Participants, and may reflect distinctions based on the reasons for termination of employment or service.

11.OTHER STOCK-BASED AWARDS.

(a)Grant. The Committee shall have the right to grant other Awards that may include, without limitation, the grant of Shares based on attainment of performance goals established by the Committee, the payment of Shares as a bonus or in lieu of cash based on attainment of performance goals established by the Committee, and the payment of Shares in lieu of cash under other Company incentive or bonus programs.

(b)Period of Restriction. The Period of Restriction subject to an Other Stock-Based Award may, at the discretion of the Committee, lapse on a pro-rated, graded, or cliff basis (as specified in an Award Agreement), subject to the minimum vesting requirements in Section 3(c)(ii).

(c)Payment of Other Stock-Based Awards. Subject to Section 11(b) hereof, payment under or settlement of any such Awards shall be made in such manner and at such times as the Committee may determine. The Committee may provide that settlement of Other Stock-Based Awards shall be deferred, on a mandatory basis or at the election of the Participant, in compliance with Applicable Laws, including Section 409A.

(d)Termination of Employment or Service. The Committee shall determine the extent to which the Participant shall have the right to receive Other Stock-Based Awards following termination of the Participant’s employment or, if the Participant is a Director or Consultant, service with the Company and its Subsidiaries. Such provisions shall be determined in the sole discretion of the Committee, such provisions may be included in an agreement entered into with each Participant, but need not be uniform among all Other Stock-Based Awards, and may reflect distinctions based on the reasons for termination of employment or service.

12.CASH-BASED AWARDS.

(a)Grant of Cash-Based Awards. Subject to the terms and provisions of the Plan, Cash-Based Awards may be granted to Participants in such amounts and upon such terms, and at any time and from time to time, as shall be determined by the Committee.

(b)Award Agreement. Each grant of a Cash-Based Award may be evidenced by an Award Agreement that shall specify the terms and conditions, restrictions and contingencies, if any, as the Committee shall determine and as set forth in the Award Agreement. Restrictions and contingencies limiting the right to receive a cash payment pursuant to a Cash-Based Award shall be based upon the achievement of single or multiple performance measures over a performance period established by the Committee.

(c)Form and Timing of Payment. Except as otherwise provided in Section 17 herein or a Participant’s Award Agreement, payment of Cash-Based Awards shall be made in cash at a specified payment date that shall not be earlier than the last day of the performance period. The Committee may provide that the payment of Cash-Based Awards shall be deferred, on a mandatory basis or at the election of the Participant, in compliance with Applicable Laws, including Section 409A.

(d)Termination of Employment or Service. Each Award Agreement shall set forth the extent to which the Participant shall have the right to receive a payout respecting a Cash-Based Award following termination of the Participant’s employment with the Company and its Subsidiaries. Such provisions shall be determined in the sole discretion of the Committee, need not be uniform among all Participants, and may reflect distinctions based on the reasons for termination of employment.

13.DIVIDEND EQUIVALENTS. At the discretion of the Committee, Awards (other than Options and SARs) granted pursuant to the Plan may provide Participants with the right to receive Dividend Equivalents. No payment shall be made with respect to any Dividend Equivalents granted in connection with an Award unless, until and only to the extent that the related vesting conditions of such Award are satisfied. Any crediting of Dividend Equivalents may be subject to such restrictions and conditions as the Committee may establish, including reinvestment in additional Restricted Stock Units, Performance Stock Units, or Other Stock-Based Awards and may be settled in cash or in Shares as determined by the Committee.

14.TRANSFERABILITY OF AWARDS. Incentive Stock Options may not be sold, transferred, pledged, assigned, or otherwise alienated or hypothecated, other than by will or by the laws of descent and distribution, and shall be exercisable during a Participant’s lifetime only by such Participant. Other Awards shall be transferable by will, by the laws of descent and distribution or, solely to the extent and in the manner authorized by the Committee, by transfer to members of the Participant’s Immediate Family or pursuant to a qualified domestic relations order.

15.WITHHOLDING OF TAXES.

(a)Options and Stock Appreciation Rights. Subject to Section 15(d), as a condition to the delivery of Shares pursuant to the exercise of an Option or Stock Appreciation Right, the Committee may require that the Participant, at the time of exercise, pay to the Company by cash, certified check, bank draft, wire transfer or postal or express money order an amount sufficient to satisfy any applicable tax withholding obligations, as calculated at the applicable minimum statutory rate. The Committee may also, in its discretion, accept payment of tax withholding obligations by the withholding of Shares subject to the Award or by withholding amounts due from other wages.

(b)Other Awards Payable in Shares. Subject to Section 15(d), the Company shall satisfy a Participant’s tax withholding obligations, calculated at the applicable minimum statutory rate, arising in connection with the release of restrictions on and/or settlement of Restricted Stock, Restricted Stock Units, Performance Stock Units and Other Stock-Based Awards by withholding Shares that would otherwise be available for delivery. Alternatively, the Company, in its discretion, may allow the Participant to satisfy the Participant’s tax withholding obligations by payment to the Company in cash or by certified check, bank draft, wire transfer, postal or express money order, or by withholding amounts due from other wages.

(c)Cash Awards. The Company shall satisfy a Participant’s tax withholding obligation arising in connection with the payment of any Award in cash by withholding cash from such payment.

(d)Withholding Amount. The Committee, in consideration of applicable accounting standards, has full discretion to either (i) allow Participants to elect, or (ii) otherwise direct as a general rule, to have the Company withhold Shares for taxes at an amount greater than the applicable minimum statutory amount.

16.CONDITIONS UPON ISSUANCE OF SHARES.

(a)Shares shall not be issued pursuant to the exercise or vesting of an Award unless the exercise or vesting of such Award and the issuance and delivery of such Shares pursuant thereto shall comply with all Applicable Laws, and to the extent required by the Committee shall be further subject to the approval of counsel for the Company with respect to such compliance.

(b)As a condition to the exercise or vesting of an Award, the Company may require the person exercising such Award to represent and warrant at the time of any such exercise or vesting that the Shares are being purchased only for investment and without any present intention to sell or distribute such Shares if, to the extent required by the Committee and in the opinion of counsel for the Company, such a representation is required by any Applicable Laws.

17.ADJUSTMENTS UPON CHANGES IN CAPITALIZATION. In the event of any non reciprocal transaction between the Company and the stockholders of the Company that causes the per Share value of Shares underlying an Award to change, such as a stock dividend, stock split, spin off, rights offering, or recapitalization through a large, nonrecurring cash dividend, and in the event of any other change in corporate capitalization, such as a merger, consolidation, any reorganization (whether or not such reorganization comes within the definition of such term in Section 368 of the Code) or any partial or complete liquidation of the Company, the Company, in its sole discretion, may cause there to be made an equitable adjustment to the number and kind shares that may be issued under the Plan, or to any individual under the Plan, and to the number and kind of shares or other property subject to and the Exercise Price (if applicable) of any then outstanding Awards, and such adjustment shall be conclusive and binding for all purposes of the Plan.

18.CHANGE IN CONTROL, CASH-OUT AND TERMINATION OF UNDERWATER OPTIONS/SARS, AND SUBSIDIARY DISPOSITION.

(a)Change in Control. Except as otherwise provided in a Participant’s Award Agreement or pursuant to Section 18(b) hereof, upon the occurrence of a Change in Control, unless otherwise specifically prohibited under Applicable Laws, or by the rules and regulations of any governing governmental agencies or national securities exchanges:

i.any and all outstanding Options and SARs granted hereunder shall become immediately exercisable unless such Awards are assumed, converted or replaced by the continuing entity; provided, however, that in the event of a Participant’s termination of employment without Cause or termination with Good Reason within 12 months following consummation of a Change in Control, any replacement awards shall become immediately exercisable;

ii.any Period of Restriction or other restriction imposed on Restricted Stock, Restricted Stock Units, and Other Stock-Based Awards shall lapse unless such Awards are assumed, converted or replaced by the continuing entity; provided, however, that in the event of a Participant’s termination of employment without Cause or termination with Good Reason within 12 months following consummation of a Change in Control, the Period of Restriction on any replacement awards shall lapse upon such termination; and

iii.any and all Performance Stock Units and other Awards (if performance-based) shall vest (with the level of performance determined by the Committee) unless such Awards are assumed, converted or replaced by the continuing entity; provided, however, that in the event of a Participant’s termination of employment without Cause or termination with Good Reason within 12 months following the consummation of a Change in Control, any replacement awards shall fully vest upon such termination (with the level of performance determined by the Committee); provided, further, that the performance measures applicable to any assumed, converted or replaced award may, in the Committee’s discretion, (A) be determined based on performance achieved as of the date of the Change in Control, if determinable, (B) be determined based on a specified level of performance as of the date of the Change in Control, or (C) may be continued or adjusted to reflect such Change in Control.

(b)Cash-Out and Termination of Awards. The Committee may, in its sole discretion, provide that:

i.all outstanding Awards shall be terminated upon the occurrence of a Change in Control and that each Participant shall receive, with respect to each Share subject to such Award, an amount in cash equal to the excess of the Fair Market Value of a Share immediately prior to the occurrence of the Change in Control over the Option Exercise Price or the SAR grant price, if applicable; and

ii.Options and SARs outstanding as of the date of the Change in Control may be cancelled and terminated without payment therefore if the Fair Market Value of a Share as of the date of the Change in Control is equal to or less than the Option Exercise Price or the SAR grant price.

(c)Subsidiary Disposition. The Committee shall have the authority, exercisable either in advance of any actual or anticipated Subsidiary Disposition or at the time of an actual Subsidiary Disposition and either at the time of the grant of an Award or at any time while an Award remains outstanding, to provide for the automatic full vesting and exercisability of one or more outstanding unvested Awards under the Plan and the termination of restrictions on transfer and repurchase or forfeiture rights on such Awards, in connection with a Subsidiary Disposition, but only with respect to those Participants who are at the time engaged primarily in Continuous Service with the Subsidiary involved in such Subsidiary Disposition. The Committee also shall have the authority to condition any such Award vesting and exercisability or release from such limitations upon the subsequent termination of the affected Participant’s Continuous Service with that Subsidiary within a specified period following the effective date of the Subsidiary Disposition. The Committee may provide that any Awards so vested or released from such limitations in connection with a Subsidiary Disposition, shall remain fully exercisable until the expiration or sooner termination of the Award.

19.AMENDMENT, SUSPENSION OR TERMINATION OF THE PLAN.

(a)Amendment, Modification and Termination. The Board may at any time and from time to time, alter, amend, suspend or terminate the Plan in whole or in part; provided, however, that no amendment that requires stockholder approval in order for the Plan to continue to comply with the Nasdaq listing standards or any rule promulgated by the SEC or any securities exchange on which Shares are listed or any other Applicable Laws shall be effective unless such amendment shall be approved by the requisite vote of stockholders of the Company entitled to vote thereon within the time period required under such applicable listing standard or rule.

(b)Adjustment of Awards Upon the Occurrence of Certain Unusual or Nonrecurring Events. The Committee may make adjustments in the terms and conditions of, and the criteria included in, Awards in recognition of unusual or nonrecurring events (including the events described in Section 18 hereof) affecting the Company or the financial statements of the Company or of changes in Applicable Laws, regulations, or accounting principles, whenever the Committee determines that such adjustments are appropriate in order to prevent dilution or enlargement of the benefits or potential benefits intended to be made available under the Plan.

(c)Awards Previously Granted. No termination, amendment or modification of the Plan or of any Award shall adversely affect in any material way any Award previously granted under the Plan without the written consent of the Participant holding such Award, unless such termination, modification or amendment is compensated by adequate consideration or required by Applicable Laws and except as otherwise provided herein.

(d)No Repricing. Except for adjustments made pursuant to Section 17, no amendment shall reduce the Exercise Price of outstanding Options or the grant price of outstanding SARs, nor may any outstanding Options or outstanding SARs be surrendered to the Company as consideration for (i) the grant of new Options or SARs with a lower Exercise Price or grant price or (ii) for cash or a new Award with a lower (or no) Exercise Price, in each case, without the approval of the stockholders of the Company.

20.RESERVATION OF SHARES.

(a)The Company, during the term of the Plan, will at all times reserve and keep available such number of Shares as shall be sufficient to satisfy the requirements of the Plan.

(b)The inability of the Company to obtain authority from any regulatory body having jurisdiction, which authority is deemed by the Company’s counsel to be necessary to the lawful issuance and sale of any Shares hereunder, shall relieve the Company of any liability in respect of the failure to issue or sell such Shares as to which such requisite authority shall not have been obtained.

21.RIGHTS OF PARTICIPANTS.

(a)Continued Service. The Plan shall not confer upon any Participant any right with respect to continuation of employment or consulting relationship with the Company, nor shall it interfere in any way with his or her right or the Company’s right to terminate his or her employment or consulting relationship at any time, with or without Cause.

(b)Participant. No Employee, Director or Consultant shall have the right to be selected to receive an Award under the Plan, or, having been so selected, to be selected to receive future Awards.

22.SUCCESSORS. All obligations of the Company under the Plan and with respect to Awards shall be binding on any successor to the Company, whether the existence of such successor is the result of a direct or indirect purchase, merger, consolidation, or other event, or a sale or disposition of all or substantially all of the business and/or assets of the Company and references to the “Company” herein and in any Award Agreements shall be deemed to refer to such successors.

23.LEGAL CONSTRUCTION.

(a)Interpretation. Except where otherwise indicated by the context, any masculine term used herein also shall include the feminine, the plural shall include the singular and the singular shall include the plural. Any reference in the Plan to a Section of the Plan either in the Plan or any Award Agreement or to an agreement, act, code, rule or regulation shall be deemed to refer to such Section of the Plan, agreement, act, code, section, rule or regulation, as may be amended from time to time, or to any successor Section of the Plan, act, code, section, rule or regulation. All references to "including" shall be construed as meaning "including without limitation."

(b)Severability. In the event any provision of the Plan shall be held illegal or invalid for any reason, the illegality or invalidity shall not affect the remaining parts of the Plan, and the Plan shall be construed and enforced as if the illegal or invalid provision had not been included.

(c)Requirements of Law. The granting of Awards and the issuance of Shares or cash under the Plan shall be subject to all Applicable Laws and to such approvals by any governmental agencies or national securities exchanges as may be required.

(d)Governing Law. To the extent not preempted by federal law, the Plan, and all agreements hereunder, shall be construed in accordance with and governed by the laws of the State of Delaware, excluding any conflicts or choice of law rule or principle that might otherwise refer construction or interpretation of this Plan to the substantive law of another jurisdiction.

(e)Non-Exclusive Plan. Neither the adoption of the Plan by the Board nor its submission to the stockholders of the Company for approval shall be construed as creating any limitations on the power of the Board or a committee thereof to adopt such other incentive arrangements as it may deem desirable.

(f)Code Section 409A Compliance. To the extent applicable, it is intended that this Plan and any Awards granted hereunder be exempt from, or comply, with the requirements of Section 409A. Any provision that would cause the Plan or any Award granted hereunder to fail to satisfy Section 409A shall have no force or effect until amended to comply with Section 409A, which amendment may be retroactive to the extent permitted by Section 409A. Notwithstanding anything in this Plan or Award granted hereunder to the contrary, in no event will the Committee provide for the deferral of settlement or vesting of any Award, on a mandatory basis or Participant elective basis, unless such deferral is documented in writing and administered in compliance with Section 409A. In no event shall the number, kinds, or Exercise Price of any Award granted hereunder be modified or extended if such modification or extension would result in a violation of Section 409A.

24.CLAWBACK. Awards granted under the Plan will be subject to recoupment in accordance with any clawback policy that the Company adopts or is required to adopt pursuant to the listing standards of any national securities exchange or association on which the Company’s securities are listed or as is otherwise required by the Dodd-Frank Wall Street Reform and Consumer Protection Act or other applicable law. In addition, the Committee may impose such other clawback, recovery or recoupment provisions in an Award Agreement as the Committee determines necessary or appropriate, including a reacquisition right in respect of previously acquired shares of Common Stock or other cash or property upon the occurrence of misconduct. No recovery of compensation under such a clawback policy will be an event giving rise to a right to resign for “good reason” or be deemed a "constructive termination" (or any similar term) as such terms are used in any agreement between any Participant and the Company.

1.Definitions. As used in the Plan, the following definitions shall apply:

"Affiliate" and "Associate" shall have the respective meanings ascribed to such terms in Rule 12b-2 of the Exchange Act. "Applicable Laws" means the legal requirements relating to the administration of stock incentive plans, if any, under applicable provisions of federal securities laws, state corporate and securities laws, the Code, and the rules of any applicable stock exchange or national market system.

"Award" means, individually or collectively, Nonqualified Stock Options, Incentive Stock Options, Stock Appreciation Rights, Restricted Stock, Restricted Stock Units, Performance Stock Units, Other Stock-Based Awards, and Cash-Based Awards granted under the Plan.

"Award Agreement" means an agreement entered into by the Company and a Participant setting forth the terms and provisions applicable to an Award.

"Board" means the Board of Directors of the Company.

"Cash-Based Award" means an Award other than a Nonqualified Stock Option, Incentive Stock Option, Stock Appreciation Right, Restricted Stock, Restricted Stock Unit, Performance Stock Unit or Other Stock-Based Award granted under the Plan.

"Cause" means, with respect to the termination by the Company or a Subsidiary of the Participant’s Continuous Service, that such termination is for “Cause” as such term is expressly defined in a then-effective written agreement between the Participant and the Company or such Subsidiary, or in the absence of such then-effective written agreement and definition, is based on, in the determination of the Committee, the Participant’s: (i) performance of any act or failure to perform any act in bad faith and to the detriment of the Company or a Subsidiary; (ii) dishonesty, intentional misconduct or material breach of any agreement with the Company or a Subsidiary; or (iii) commission of a crime involving dishonesty, breach of trust or physical or emotional harm to any person.

"Change in Control" means a change in ownership or control of the Company effected through any of the following transactions:

(a)the direct or indirect acquisition by any person or related group of persons ("Person") (other than an acquisition from or by the Company or by a Company-sponsored employee benefit plan or by a Person that directly or indirectly controls, is controlled by or is under common control with, the Company) of beneficial ownership (within the meaning of Rule 13d-3 of the Exchange Act) of securities possessing more than 50% of the total combined voting power of the Company’s outstanding securities pursuant to a tender or exchange offer made directly to the Company’s stockholders which a majority of the members of the Board who are not Affiliates or Associates of the offeror do not recommend such stockholders accept;

(b)a change in the effective control of the Company which occurs on the date that a majority of members of the Board is replaced during any 12-month period by Directors whose appointment or election is not endorsed by a majority of the members of the Board prior to the date of the appointment or election. For purposes of this subsection (ii), if any Person is considered to be in effective control of the Company, the acquisition of additional control of the Company by the same Person will not be considered a Change in Control; or

(c)a change in the ownership of a substantial portion of the Company’s assets which occurs on the date that any Person acquires (or has acquired during the 12-month period ending on the date of the most recent acquisition by such person or persons) assets from the Company that have a total gross fair market value equal to or more than 50% of the total gross fair market value of all of the assets of the Company immediately prior to such acquisition or acquisitions; provided, however, that for purposes of this subsection (iii), the following will not constitute a change in the ownership of a substantial portion of the Company’s assets: (A) a transfer to an entity that is controlled by the Company’s stockholders immediately

after the transfer, or (B) a transfer of assets by the Company to: (1) a stockholder of the Company (immediately before the asset transfer) in exchange for or with respect to the Company’s stock, (2) an entity, 50% or more of the total value or voting power of which is owned, directly or indirectly, by the Company, (3) a Person, that owns, directly or indirectly, 50% or more of the total value or voting power of all the outstanding stock of the Company, or (4) an entity, at least 50% of the total value or voting power of which is owned, directly or indirectly, by a Person described in this subsection (iii)(B)(3). For purposes of this subsection (iii), gross fair market value means the value of the assets of the Company, or the value of the assets being disposed of, determined without regard to any liabilities associated with such assets. For purposes of this subsection (iii), persons will be considered to be acting as a group if they are owners of a corporation that enters into a merger, consolidation, purchase or acquisition of stock, or similar business transaction with the Company.

Notwithstanding anything herein to the contrary, with respect to any amounts that constitute deferred compensation under Section 409A, to the extent required to avoid accelerated taxation or penalties, no Change in Control will be deemed to have occurred unless such Change in Control also constitutes a change in the ownership or effective control of the Company or a change in the ownership of a substantial portion of the Company’s assets under Section 409A.

"Code" means the Internal Revenue Code of 1986.

"Company" means Arq, Inc. and any successor thereto as provided in Section 22 herein.

"Consultant" means any current or prospective non-employee consultant or advisor to the Company or a Subsidiary.

"Continuous Service" means that the provision of services to the Company or any Subsidiary in any capacity of Employee or Consultant is not interrupted or terminated. Continuous Service shall not be considered interrupted in the case of (i) any leave of absence approved by the Company or (ii) transfers between locations of the Company or between the Company, any Subsidiary, or any successor. A leave of absence approved by the Company shall include sick leave, military leave, or any other personal leave approved by an authorized representative of the Company. For purposes of Incentive Stock Options, no such leave may exceed 90 days, unless reemployment upon expiration of such leave is guaranteed by statute or contract.

"Corporate Transaction" means any of the following transactions:

(a)a merger or consolidation in which the Company is not the surviving entity, except for a transaction the principal purpose of which is to change the state in which the Company is incorporated;

(b)the sale, transfer or other disposition of all or substantially all of the assets of the Company;

(c)the complete liquidation or dissolution of the Company;

(d)any reverse merger or series of related transactions culminating in a reverse merger (including, but not limited to, a tender offer followed by a reverse merger) in which the Company is the surviving entity but in which securities possessing more than 50% of the total combined voting power of the Company’s outstanding securities are transferred to a person or persons different from those who held such securities immediately prior to such merger but excluding any such transaction or series of related transactions that the Committee determines shall not be a Corporate Transaction; or

(e)acquisition in a single or series of related transactions by any person or related group of persons (other than the Company or by a Company-sponsored employee benefit plan) of beneficial ownership (within the meaning of Rule 13d-3 of the Exchange Act) of securities possessing more than 50% of the total combined voting power of the Company’s outstanding securities but excluding any such transaction or series of related transactions that the Committee determines shall not be a Corporate Transaction.

"Director" means any individual who is a member of the Board of Directors of the Company or a Subsidiary who is not an Employee.

"Dividend" means the dividends declared and paid on Shares subject to an Award.

"Dividend Equivalent" means, with respect to Shares subject to an Award, a right to be paid an amount equal to the Dividends declared and paid on an equal number of outstanding Shares.

"Employee" means any current or prospective employee of the Company or a Subsidiary.

"Exchange Act" means the Securities Exchange Act of 1934.

"Exercise Price" means the price at which a Share may be purchased by a Participant pursuant to an Option.

"Fair Market Value" means, as of any date, the value of a Share determined as follows:

(a)Where there exists a public market for the Share, the Fair Market Value shall be (A) the closing sales price for a Share for the last market trading day prior to the time of the determination (or, if no sales were reported on that date, on the last trading date on which sales were reported) on the New York Stock Exchange, the Nasdaq National Market System or the principal securities exchange on which the Share is listed for trading, whichever is applicable, or (B) if the Share is not traded on any such exchange or national market system, the average of the closing bid and asked prices on the date of determination, in each case, as reported in The Wall Street Journal or such other source as the Committee deems reliable; or

(b)In the absence of an established market of the type described above, for the Shares, the Fair Market Value thereof shall be determined by the Committee in good faith, and such determination shall be conclusive and binding on all persons.

"Good Reason" means the occurrence, after a Corporate Transaction or Change in Control, of any of the following events or conditions unless consented to by the Participant (and the Participant shall be deemed to have consented to any such event or condition unless the Participant provides written notice of the Participant’s non-acquiescence within 90 days of the effective time of such event or condition and the Company cannot cure any such event or condition within 30 days upon such notice):

(a)a change in the Participant’s responsibilities or duties which represents a material and substantial diminution in the Participant’s responsibilities or duties as in effect immediately preceding the consummation of a Corporate Transaction or Change in Control;

(b)a reduction in the Participant’s base salary to a level below that in effect at any time within six months preceding the consummation of a Corporate Transaction or Change in Control or at any time thereafter; or

(c)requiring the Participant to be based at any place outside a 50-mile radius from the Participant’s job location or residence prior to the Corporate Transaction or Change in Control except for reasonably required travel on business which is not materially greater than such travel requirements prior to the Corporate Transaction or Change in Control.

"Immediate Family" means any child, stepchild, grandchild, parent, stepparent, grandparent, spouse, former spouse, sibling, niece, nephew, mother-in-law, father-in-law, son-in law, daughter-in-law, brother-in-law or sister-in-law, including adoptive relationships, any person sharing the Participant’s household (other than a tenant or employee), a trust in which these persons (or the Participant) have more than 50% of the beneficial interest, a foundation in which these persons (or the Participant) control the management of assets, and any other entity in which these persons (or the Participant) own more than 50% of the voting interests.

"Incentive Stock Option" or "ISO" means an Option intended to qualify as an incentive stock option within the meaning of Section 422 of the Code.

"Nonqualified Stock Option" means an Option that is not intended to meet the requirement of Section 422 of the Code. "Option" means an Incentive Stock Option or a Nonqualified Stock Option granted under the Plan, as described in Section 6 herein.

"Other Stock-Based Award" means a Share-based or Share-related Award granted pursuant to Section 11 herein.

"Participant" means a current or former Employee, Director or Consultant who has rights relating to an outstanding Award.

"Performance Stock Unit" means an Award granted to a Participant, as described in Section 10 herein.

"Period of Restriction" means the period Restricted Stock, Restricted Stock Units or Other Stock-Based Awards are subject to a substantial risk of forfeiture and are not transferable, as provided in Sections 8, 9 and 11 herein. Such Period of Restriction shall comply with the minimum vesting requirements set forth in Section 3(c)(ii).

"Plan" means this Arq, Inc. 2024 Omnibus Incentive Plan.

"Prior Plans" means the Advanced Emissions Solutions, Inc. 2017 Omnibus Incentive Plan and the Advanced Emissions Solutions, Inc. 2022 Omnibus Incentive Plan.

"Restricted Stock" means an Award granted to a Participant, as described in Section 8 herein.

"Restricted Stock Units" means an Award granted to a Participant, as described in Section 9 herein.

"SEC" means the United States Securities and Exchange Commission.

"Section 409A" means Section 409A of the Code and the regulations and other guidance promulgated thereunder.

"Share" means a share of common stock of the Company, par value $0.001 per share, subject to adjustment pursuant to Section 17 herein.

"Stock Appreciation Right" or "SAR" means an Award granted to a Participant, as described in Section 7 herein.

"Subsidiary" means any corporation in which the Company owns, directly or indirectly, at least 50% of the total combined voting power of all classes of stock, or any other entity (including, but not limited to, partnerships and joint ventures) in which the Company owns, directly or indirectly, at least 50% of the combined equity thereof. Notwithstanding the foregoing, for purposes of determining whether any individual may be a Participant for purposes of any grant of Incentive Stock Options, the term “Subsidiary” shall have the meaning ascribed to such term in Code Section 424(f).

"Subsidiary Disposition" means the disposition by the Company of its equity holdings in any Subsidiary effected by a merger or consolidation involving that Subsidiary, the sale of all or substantially all of the assets of that Subsidiary or the Company’s sale or distribution of substantially all of the outstanding capital stock of such Subsidiary.