X0508 4 2026-02-28 0 0001442236 Quest Resource Holding Corp QRHC 0001685481 Tomolonius Sarah 3481 PLANO PARKWAY THE COLONY TX 75056 1 0 0 0 0 Common Stock 2026-02-28 4 A 0 1988 1.76 A 43710 D Common Stock 44335 D These reported securities represent deferred stock units ("DSUs") granted under the Issuer's 2024 Incentive Compensation Plan. The shares of common stock underlying such DSUs shall be issued upon the Reporting Person's separation from service with the Issuer. The reported securities include (a) 17,429 DSUs granted under the Issuer's 2012 Incentive Compensation Plan and (b) 26,281 DSUs granted under the Issuer's 2024 Incentive Compensation Plan. The shares of common stock underlying such DSUs shall be issued upon the Reporting Person's separation from service with the Issuer. Includes (a) 20,000 RSUs that are scheduled to fully vest on August 13, 2026 and (b) 24,335 shares of common stock beneficially owned by the Reporting Person. /s/ Brett W. Johnston, as Attorney-in-Fact 2026-03-03