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Each RSU represents a contingent right to receive one share of common stock upon vesting. The Reporting Person has reported prior awards of RSUs in Table II of Form 4."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"RSUs convert into common stock on a one-for-one basis."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"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 the Reporting Person."}],"balance_after":40585,"source":{"system":"sec-edgar","filing":"0000921895-25-002308","document":"form412364002fri_08142025.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1448795/000092189525002308/form412364002fri_08142025.xml","form_type":"4"}},{"id":1066356,"issuer":{"id":852,"kind":"organization","name":"Quest Resource Holding Corp","symbol":"QRHC"},"owners":[{"id":870,"kind":"person","name":"FRIEDBERG DANIEL M.","position":1,"cik":"0001448795","reported_name":"FRIEDBERG DANIEL M.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":871,"kind":"organization","name":"Hampstead Park Capital Management, LLC","position":2,"cik":"0001773816","reported_name":"Hampstead Park Capital Management, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":872,"kind":"organization","name":"Hampstead Park Environmental Services Investment Fund LLC","position":3,"cik":"0001773840","reported_name":"Hampstead Park Environmental Services Investment Fund LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2025-08-14T20:51:52.000Z","date":"2025-08-12","kind":"exercise","planned":false,"acquired":true,"shares":10409,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents restricted stock units (\"RSUs\") granted on August 12, 2024 that fully vested on August 12, 2025. 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These shares of common stock underlying such deferred stock units shall be issued upon Mr. Friedberg's separation from service with the Issuer."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The reported securities include (a) 18,153 deferred stock units granted under the Issuer's 2012 Incentive Compensation Plan and (b) 21,431 deferred stock units granted under the Issuer's 2024 Incentive Compensation Plan. The shares of common stock underlying such deferred stock units shall be issued upon Mr. Friedberg's separation from service with the Issuer."}],"balance_after":39584,"source":{"system":"sec-edgar","filing":"0000921895-25-000962","document":"form412364002fri_04022025.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1448795/000092189525000962/form412364002fri_04022025.xml","form_type":"4"}},{"id":1195599,"issuer":{"id":852,"kind":"organization","name":"Quest Resource Holding Corp","symbol":"QRHC"},"owners":[{"id":870,"kind":"person","name":"FRIEDBERG DANIEL M.","position":1,"cik":"0001448795","reported_name":"FRIEDBERG DANIEL M.","relationship":{"director":true,"officer":false,"ten_percent_owner":true,"other":false}},{"id":871,"kind":"organization","name":"Hampstead Park Capital Management, LLC","position":2,"cik":"0001773816","reported_name":"Hampstead Park Capital Management, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":872,"kind":"organization","name":"Hampstead Park Environmental Services Investment Fund LLC","position":3,"cik":"0001773840","reported_name":"Hampstead Park Environmental Services Investment Fund LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2025-03-20T20:02:15.000Z","date":"2025-03-19","kind":"purchase","planned":false,"acquired":true,"shares":2574,"price":2.9616,"value":7623.1584,"ownership":{"direct":false,"nature":"By: Hampstead Park Environmental Services Investment Fund LLC"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $2.895 to $2.99, inclusive. The Reporting Persons undertake to provide the Issuer and any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, further information regarding the number of shares purchased at each separate price such shares were purchased."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"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. 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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. 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These shares were purchased in multiple transactions at prices ranging from $3.91 to $3.96, inclusive. The Reporting Persons undertake to provide the Issuer and any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, further information regarding the number of shares purchased at each separate price such shares were purchased."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"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. 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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. 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