Arq, Inc.

Amendment No. 1 to Revolving Credit Facility

On May 6, 2025, Arq, Inc. (the "Company") and certain of its subsidiaries, entered into the first amendment (the "First Amendment") to the Credit, Security and Guaranty Agreement (the "Revolving Credit Agreement"), dated December 27, 2024, with MidCap Funding IV Trust, in its capacity as agent, the lenders from time to time party thereto, and any entities that become party thereto as Guarantors, which provides for, among other things, amendments to the borrowing availability calculation included in the Revolving Credit Agreement, and an update to the Company's minimum liquidity covenant providing for decreased minimum liquidity required through certain applicable date ranges as shown in the table below:

The foregoing description of the First Amendment is only a summary of its material terms and does not purport to be complete and is qualified in its entirety by reference to the full text of the First Amendment, which is filed as Exhibit 10.2 to this Quarterly Report on Form 10-Q and incorporated herein by reference.

Rule 10b5-1 Trading Plans

During the three months ended March 31, 2025, no director or officer of the Company adopted orterminated a Rule 10b5-1 trading arrangement or non-Rule 10b5-1 trading arrangement, as each term is defined in Item 408(a) of Regulation S-K.