Quest Resource director buys 8,500 shares

Quest Resource Holding Corp director and 10% owner Daniel M. Friedberg bought 8,500 shares of common stock in an open-market purchase at $0.87 per share.

Rhea-AI Filing Summary

Quest Resource Holding Corp director and 10% owner Daniel M. Friedberg bought 8,500 shares of common stock in an open-market purchase at $0.87 per share. After this transaction, he directly holds 49,085 common shares, which include restricted stock units scheduled to vest on August 13, 2026.

Separate entries show 71,160 deferred stock units that will convert into common shares upon his separation from service, and 2,842,353 shares held indirectly through Hampstead Park Environmental Services Investment Fund LLC, which is controlled by Hampstead Park Capital Management, LLC with Mr. Friedberg as CEO.

Insider Trade Summary

Net Buyer: 8,500 shares

Net Buy 3 txns

Insider FRIEDBERG DANIEL M., Hampstead Park Capital Management, LLC, Hampstead Park Environmental Services Investment Fund LLC

Role Director, 10% Owner | 10% Owner | 10% Owner

Bought 8,500 shs ($7K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	8,500	$0.87	$7K
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 120,245 shares (Direct); Common Stock — 2,842,353 shares (Indirect, By: Hampstead Park Environmental Services Investment Fund LLC)

Footnotes (3)

1. F1. Includes (a) 20,000 restricted stock units that are scheduled to fully vest on August 13, 2026 and (b) 29,085 shares of common stock beneficially owned by Mr. Friedberg.
2. F2. The reported securities include (a) 18,153 deferred stock units ("DSUs") granted under the Issuer's 2012 Incentive Compensation Plan and (b) 53,007 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.
3. F3. 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.

FAQ

What insider transaction did QRHC director Daniel Friedberg report?

Daniel M. Friedberg reported an open-market purchase of 8,500 Quest Resource Holding Corp common shares at $0.87 per share. This filing reflects additional personal investment in the company by a director and 10% owner, though the dollar value of the trade is relatively small.

How many Quest Resource (QRHC) shares does Daniel Friedberg hold after the trade?

After the reported purchase, Daniel Friedberg directly holds 49,085 Quest Resource common shares. In addition, a separate entry shows 71,160 deferred stock units and 2,842,353 shares held indirectly through Hampstead Park Environmental Services Investment Fund LLC associated with him.

At what price did the QRHC insider buy shares on March 19, 2026?

On March 19, 2026, Daniel M. Friedberg bought 8,500 Quest Resource common shares at $0.87 per share. The transaction is reported as an open-market purchase, indicating he acquired the stock on the public market rather than through an option exercise or grant.

What indirect Quest Resource (QRHC) holdings are linked to Hampstead Park entities?

The filing shows 2,842,353 Quest Resource common shares held indirectly through Hampstead Park Environmental Services Investment Fund LLC. Hampstead Park Capital Management, LLC is the sole member of this fund, and Daniel Friedberg serves as its Chief Executive Officer, indicating control over that investment vehicle.

What restricted or deferred stock units does QRHC director Daniel Friedberg hold?

The reported holdings include 20,000 restricted stock units scheduled to fully vest on August 13, 2026. The filing also notes deferred stock units granted under the 2012 and 2024 incentive plans, with common shares issuable upon Daniel Friedberg’s separation from service with the company.

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Accepted by SEC EDGAR 03/23/2026 - 04:15 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

FRIEDBERG DANIEL M.

(Last) (First) (Middle)

C/O HAMPSTEAD PARK CAPITAL MANAGEMENT

6 LIGHTHOUSE LANE

(Street)

OLD GREENWICH CONNECTICUT 06870

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Quest Resource Holding Corp [ QRHC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/19/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

	Form filed by One Reporting Person
X	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/19/2026		P		8,500	A	$0.87	49,085(1)	D
Common Stock								71,160(2)	D
Common Stock								2,842,353	I	By: Hampstead Park Environmental Services Investment Fund LLC(3)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person^*

FRIEDBERG DANIEL M.

(Last) (First) (Middle)

C/O HAMPSTEAD PARK CAPITAL MANAGEMENT

6 LIGHTHOUSE LANE

(Street)

OLD GREENWICH CONNECTICUT 06870

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Hampstead Park Capital Management, LLC

(Last) (First) (Middle)

6 LIGHTHOUSE LANE

(Street)

OLD GREENWICH CONNECTICUT 06870

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Hampstead Park Environmental Services Investment Fund LLC

(Last) (First) (Middle)

6 LIGHTHOUSE LANE

(Street)

OLD GREENWICH CONNECTICUT 06870

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

Explanation of Responses:

1. Includes (a) 20,000 restricted stock units that are scheduled to fully vest on August 13, 2026 and (b) 29,085 shares of common stock beneficially owned by Mr. Friedberg.

2. The reported securities include (a) 18,153 deferred stock units ("DSUs") granted under the Issuer's 2012 Incentive Compensation Plan and (b) 53,007 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.

3. 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	03/23/2026
	Hampstead Park Capital Management, LLC; By: /s/ Daniel Friedberg, Chief Executive Officer	03/23/2026
	Hampstead Park Environmental Services Investment Fund LLC; By: Hampstead Park Capital Management, LLC; By: /s/ Daniel Friedberg, Chief Executive Officer	03/23/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)