Exhibit 99.1 Quest Resource Holding Corporation Reports First Quarter 2024 Financial Results Double-Digit Growth in Gross Profit Resulting from Business Expansion and Efficiency Gains Significant New Business Wins and Pipeline Growth Reflect Company’s Strong Value Proposition and Momentum Investor Conference Call & Webcast to be held at 5pm ET on Thursday, May 9, 2024 THE COLONY, TX – May 9, 2024 – Quest Resource Holding Corporation (Nasdaq: QRHC) (“Quest”), a national leader in environmental waste and recy ...