X0508 4 2025-11-11 0 0001515156 Arq, Inc. ARQ 0001963344 Campbell-Breeden Richard C/O ARQ, INC. 8051 E. MAPLEWOOD AVENUE, SUITE 210 GREENWOOD VILLAGE CO 80111 1 0 0 0 0 Common Stock 2025-11-11 4 P 0 28638 3.5438 A 254786 I By Omeshorn Holdings Limited. Common Stock 86868 D This price is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $3.49 to $3.62, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this Form 4. The shares reported on this row are held by Omeshorn Holdings Ltd. Richard Campbell-Breeden, a Director of the Issuer, is a director of Omeshorn Holdings Ltd. and therefore is an indirect beneficial owner of the securities reported herein. /s/ Richard Campbell-Breeden 2025-11-13