X0609 4 2026-09-01 0 0001515156 Arq, Inc. ARQ 0002141907 Owino Peter Oluoch false 8051 E MAPLEWOOD AVE STE 210 GREENWOOD VILLAGE CO 80111 0 1 0 0 Chief Accounting Officer 0 Common Stock 2026-09-01 4 A 0 100000 0 A 100000 D Common Stock 2026-09-01 4 A 0 61047 0 A 161047 D Performance Share Units 2026-09-01 4 A 0 61047 0 A 2029-03-15 Common Stock 122094 61047 D Represents restricted stock awards ("RSAs") granted to Mr. Owino as an employment inducement award. 33,333 RSAs will vest on each of September 1, 2027 and September 1, 2028, and 33,334 RSAs will vest on September 1, 2029. Represents RSAs granted in accordance with the Issuer's long-term incentive plan under the Issuer's 2026 Omnibus Incentive Plan, approved by stockholders on June 10, 2026. The RSAs shall vest in three equal installments, on each of September 1, 2027, March 23, 2028, and March 23, 2029. Represents performance share units ("PSUs") granted in accordance with the Issuer's long-term incentive plan under the Issuer's 2026 Omnibus Incentive Plan. Each PSU represents a contingent right to receive one share of the Issuer's common stock upon vesting of the PSU, which will occur, if at all, no later than March 15, 2029 subject to the reporting person's continuous service with the Issuer or its related entities and the achievement of certain pre-established goals to be measured as of December 31, 2028. Represents the maximum number of PSUs that will vest, if at all, which is 200% of the target award. /s/ Peter Oluoch Owino 2026-09-03