organization · Reporting owner
Hampstead Park Environmental Services Investment Fund LLC
Disclosed activity across 1 company
Sign in to followReported relationships
Latest disclosed role at each company.
| Company | Last reported as | Report date | Published |
|---|---|---|---|
| Quest Resource Holding CorpQRHC · Entity 852 | 10% owner | September 30, 2026 | October 02, 2026 |
Disclosed balances
About these balances
Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.
Quest Resource Holding Corp
Report date September 30, 2026 · Filed October 02, 2026
Jointly reported with FRIEDBERG DANIEL M., Hampstead Park Capital Management, LLC
| Security / award | Ownership account | Disclosed shares / units | Disclosure context |
|---|---|---|---|
| Common StockSEC Table I · non-derivative | Direct | 186,126 |
Reported balance
After 2026-09-30 transaction · row 1
Holding and transaction disclosures are not merged.
1 source rowRow 1 · 2026-09-30 · Grant · Acquired 20,529 · Balance 186,126 F1: These reported securities represent restricted stock units ("RSUs") granted on September 30, 2026 under the Issuer's 2024 Incentive Compensation Plan. Each RSU represents a contingent right to receive one share of common stock upon vesting. The RSUs are scheduled to vest on March 1, 2027. F2: Includes (a) 108,274 RSUs that are scheduled to fully vest on March 1, 2027, (b) 28,767 RSUs that are scheduled to fully vest on August 13, 2027 and (c) 49,085 shares of common stock beneficially owned by Mr. Friedberg. |
| Common StockSEC Table I · non-derivative | Direct | 97,068 |
Reported balance
Holding disclosure · report date 2026-09-30 · row 2
Holding and transaction disclosures are not merged.
1 source rowRow 2 · Balance 97,068 F3: The reported securities include (a) 18,153 deferred stock units ("DSUs") granted under the Issuer's 2012 Incentive Compensation Plan and (b) 78,915 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. |
| Common StockSEC Table I · non-derivative | IndirectBy: Hampstead Park Environmental Services Investment Fund LLC | 2,842,353 |
Reported balance
Holding disclosure · report date 2026-09-30 · row 3
Holding and transaction disclosures are not merged.
1 source rowRow 3 · Balance 2,842,353 F4: 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. |
Filing footnotes · ownership attribution and instrument terms
F1: These reported securities represent restricted stock units ("RSUs") granted on September 30, 2026 under the Issuer's 2024 Incentive Compensation Plan. Each RSU represents a contingent right to receive one share of common stock upon vesting. The RSUs are scheduled to vest on March 1, 2027.
F2: Includes (a) 108,274 RSUs that are scheduled to fully vest on March 1, 2027, (b) 28,767 RSUs that are scheduled to fully vest on August 13, 2027 and (c) 49,085 shares of common stock beneficially owned by Mr. Friedberg.
F3: The reported securities include (a) 18,153 deferred stock units ("DSUs") granted under the Issuer's 2012 Incentive Compensation Plan and (b) 78,915 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.
F4: 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.
Transaction history
JSON APIPurchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”
The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.
| Transaction date | Company | Activity / security | Shares / units | Reported price | Reported value | Details |
|---|---|---|---|---|---|---|
| March 18, 2020 Filed Mar 19, 2020 22:45 UTC | Quest Resource Holding Corp QRHC · Entity 852 | PurchaseCommon Stock | 20,833 | $1.35 | $28,118.30 |
DisclosureSEC source: 0000921895-20-000835 · form412364002_03192020.xml · nonDerivative · entry 1 FRIEDBERG DANIEL M. · CIK 0001448795 · Director · 10% owner Hampstead Park Capital Management, LLC · CIK 0001773816 · 10% owner Hampstead Park Environmental Services Investment Fund LLC · CIK 0001773840 · 10% owner Joint disclosure: these amounts are not allocated separately to each reporting owner. 10b5-1 filing: Not disclosed Ownership: Indirect · By: Hampstead Park Environmental Services Investment Fund LLC Disclosed balance after: 2,100,833 F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $1.25 to $1.36, 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. F2 · ownership.nature: 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. Read SEC document |
| March 17, 2020 Filed Mar 19, 2020 22:45 UTC | Quest Resource Holding Corp QRHC · Entity 852 | GrantStock Option (Right to Buy) · Derivative | 19,078 | $0.00 Strike: $1.35 | $0.00 |
DisclosureSEC source: 0000921895-20-000835 · form412364002_03192020.xml · derivative · entry 3 FRIEDBERG DANIEL M. · CIK 0001448795 · Director · 10% owner Hampstead Park Capital Management, LLC · CIK 0001773816 · 10% owner Hampstead Park Environmental Services Investment Fund LLC · CIK 0001773840 · 10% owner Joint disclosure: these amounts are not allocated separately to each reporting owner. 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 19,078 Underlying: Common Stock · 19,078 shares Expires 2030-03-17 F4 · derivative.exercise_date: The total number of shares subject to the option shall vest and become exercisable in on the one year anniversary of the grant date. Read SEC document |
| April 29, 2019 Filed Apr 30, 2019 21:52 UTC | Quest Resource Holding Corp QRHC · Entity 852 | GrantOption (Right to Buy) · Derivative | 94,787 | $0.00 Strike: $2.11 | $0.00 |
DisclosureSEC source: 0000921895-19-001212 · form411049002_05012019.xml · derivative · entry 3 FRIEDBERG DANIEL M. · CIK 0001448795 · Director · 10% owner Hampstead Park Capital Management, LLC · CIK 0001773816 · 10% owner Hampstead Park Environmental Services Investment Fund LLC · CIK 0001773840 · 10% owner Joint disclosure: these amounts are not allocated separately to each reporting owner. 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 246,446 Underlying: Common Stock · 94,787 shares Expires 2029-04-29 F3 · derivative.exercise_date: The total number of shares subject to the option shall vest and become exercisable on the date on which the Issuer's 2020 annual meeting of stockholders is held. Read SEC document |
| April 29, 2019 Filed Apr 30, 2019 21:52 UTC | Quest Resource Holding Corp QRHC · Entity 852 | GrantOption (Right to Buy) · Derivative | 151,659 | $0.00 Strike: $2.11 | $0.00 |
DisclosureSEC source: 0000921895-19-001212 · form411049002_05012019.xml · derivative · entry 2 FRIEDBERG DANIEL M. · CIK 0001448795 · Director · 10% owner Hampstead Park Capital Management, LLC · CIK 0001773816 · 10% owner Hampstead Park Environmental Services Investment Fund LLC · CIK 0001773840 · 10% owner Joint disclosure: these amounts are not allocated separately to each reporting owner. 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 151,659 Underlying: Common Stock · 151,659 shares Expires 2029-04-29 F2 · derivative.exercise_date: The total number of shares subject to the option shall vest and become exercisable in four equal annual installments beginning on the date on which the Issuer's 2020 annual meeting of stockholders is held, until fully vested. Read SEC document |
Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.