Orin Hirschman and AIGH Capital Management Fully Exit Position in Arq, Inc.

Orin Hirschman and AIGH Capital Management LLC filed a Schedule 13G/A on April 27, 2026, indicating that they have completely exited their position in Arq, Inc. (ticker: ARQ). This filing, which serves as Amendment No. 3, reports that the reporting persons now hold zero shares of Common Stock, representing a 0% ownership stake. The reporting group previously held a significant position but has now crossed below the 5% reporting threshold as of the event date of March 31, 2026. The filing was jointly submitted by Orin Hirschman, AIGH Capital Management LLC, and AIGH Investment Partners, L.L.C. Hirschman serves as the Managing Member of AIGH Capital Management and President of AIGH LLC. The securities were originally held for investment purposes in the ordinary course of business. With this filing, the reporting persons have ceased to be beneficial owners of more than five percent of the issuer's outstanding common stock.