X0508 4 2025-12-31 0 0001442236 Quest Resource Holding Corp QRHC 0001448795 FRIEDBERG DANIEL M. C/O HAMPSTEAD PARK CAPITAL MANAGEMENT 6 LIGHTHOUSE LANE OLD GREENWICH CT 06870 1 0 1 0 0001773816 Hampstead Park Capital Management, LLC 6 LIGHTHOUSE LANE OLD GREENWICH CT 06870 0 0 1 0 0001773840 Hampstead Park Environmental Services Investment Fund LLC 6 LIGHTHOUSE LANE OLD GREENWICH CT 06870 0 0 1 0 0 Common Stock 2025-12-31 4 A 0 8073 1.86 A 55644 D Common Stock 40585 D Common Stock 2842353 I By: Hampstead Park Environmental Services Investment Fund LLC 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 Mr. Friedberg's separation from service with the Issuer. The reported securities include (a) 18,153 DSUs granted under the Issuer's 2012 Incentive Compensation Plan and (b) 37,491 DSUs granted under the Issuer's 2024 Incentive Compensation Plan. The shares of common stock underlying such DSUs shall be issued upon Mr. Friedberg's separation from service with the Issuer. Includes (a) 20,000 RSUs that are scheduled to fully vest on August 13, 2026 and (b) 20,585 shares of common stock beneficially owned by Mr. Friedberg. This Form 4 is filed jointly by Hampstead Park Environmental Services Investment Fund LLC ("Hampstead Park Environmental"), Daniel Friedberg and Hampstead Park Capital Management, LLC ("Hampstead Park Capital"). Hampstead Park Capital is the sole member of Hampstead Park Environmental, and Mr. Friedberg is the Chief Executive Officer of Hampstead Park Capital; each may therefore be deemed to control Hampstead Park Environmental. In addition, Mr. Friedberg is a Director of the Issuer. /s/ Daniel Friedberg 2026-01-05 Hampstead Park Capital Management, LLC; By: /s/ Daniel Friedberg, Chief Executive Officer 2026-01-05 Hampstead Park Environmental Services Investment Fund LLC; By: Hampstead Park Capital Management, LLC; By: /s/ Daniel Friedberg, Chief Executive Officer 2026-01-05