Hydrofarm insider reports tax-withholding share disposition

HYDROFARM HOLDINGS GROUP, INC.

Rhea-AI Filing Summary

HYDROFARM HOLDINGS GROUP, INC. President Mark S. Parker reported a tax-related share disposition. On 2026-08-08, 740 shares of common stock were withheld at $1.60 per share to satisfy a tax withholding obligation arising from the vesting of 1,667 stock-settled restricted stock units. After this withholding, Parker directly held 18,558 shares of common stock.

Insider Trade Summary

Tax Withholding: 740 shares

Tax Withholding 1 txn

Insider PARKER MARK S

Role President

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock, $0.0001 par value per share F1	740	$1.60	$1K

Holdings After Transaction: Common Stock, $0.0001 par value per share — 18,558 shares (Direct)

Footnotes (1)

1. F1. Shares withheld to satisfy tax withholding obligation applicable to the vesting of 1,667 stock-settled restricted stock units, which may be settled, on a 1-for-1 basis, only in shares of common stock. Fractional amounts have been rounded to the nearest whole number

Key Figures

Shares withheld for taxes: 740 shares Transaction price per share: $1.60 per share Shares held after transaction: 18,558 shares +1 more

4 metrics

Shares withheld for taxes 740 shares Common stock withheld on 2026-08-08 to satisfy tax withholding obligation

Transaction price per share $1.60 per share Value used for the 740-share tax-withholding disposition

Shares held after transaction 18,558 shares Direct HYFM common stock holdings of Mark S. Parker following the withholding

Restricted stock units vested 1,667 units Stock-settled RSUs vesting, settled 1-for-1 in common stock, triggering tax withholding

Key Terms

stock-settled restricted stock units, tax withholding obligation, 1-for-1 basis

3 terms

stock-settled restricted stock units financial

"Shares withheld to satisfy tax withholding obligation applicable to the vesting of 1,667 stock-settled restricted stock units"

tax withholding obligation financial

"Shares withheld to satisfy tax withholding obligation applicable to the vesting of 1,667 stock-settled restricted stock units"

1-for-1 basis financial

"which may be settled, on a 1-for-1 basis, only in shares of common stock"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did HYFM President Mark S. Parker report?

Mark S. Parker reported 740 shares of HYFM common stock were withheld on 2026-08-08 at $1.60 per share to cover tax withholding on vesting restricted stock units, leaving him with 18,558 shares directly held.

Was the HYFM Form 4 transaction a discretionary sale by Mark S. Parker?

The Form 4 shows no open-market sale; instead, 740 shares were withheld to satisfy tax withholding obligations related to the vesting of 1,667 stock-settled restricted stock units of Hydrofarm Holdings Group, Inc. (HYFM).

How many HYFM shares does Mark S. Parker hold after this Form 4 transaction?

After the transaction, Mark S. Parker directly holds 18,558 shares of HYFM common stock. This figure reflects his position following the tax-withholding disposition of 740 shares on 2026-08-08 tied to RSU vesting.

What price per share was used for the HYFM tax-withholding transaction?

The tax-withholding disposition used a value of $1.60 per share for 740 shares of HYFM common stock. This price is shown as the transaction price per share for the shares withheld to cover the tax obligation on vested RSUs.

How many HYFM restricted stock units vested in connection with this Form 4?

The footnote states that 1,667 stock-settled restricted stock units vested, each settled on a 1-for-1 basis in HYFM common shares. To satisfy tax withholding on this vesting, 740 shares were withheld from Mark S. Parker.

Does the HYFM Form 4 indicate a Rule 10b5-1 trading plan for this transaction?

The filing’s Rule 10b5-1 checkbox is not marked as a plan transaction. The transaction is described instead as shares withheld to satisfy tax withholding obligations on the vesting of 1,667 restricted stock units of HYFM.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/11/2026 - 04:17 PM Accepted by SEC EDGAR 08/11/2026 - 04:16 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^*

PARKER MARK S

(Last) (First) (Middle)

1510 MAIN STREET

(Street)

SHOEMAKERSVILLE PENNSYLVANIA 19555

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
HYDROFARM HOLDINGS GROUP, INC. [ HYFM ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/08/2026

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

X	Form filed by One Reporting Person
	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, $0.0001 par value per share	08/08/2026		F		740(1)	D	$1.6	18,558	D

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

Explanation of Responses:

1. Shares withheld to satisfy tax withholding obligation applicable to the vesting of 1,667 stock-settled restricted stock units, which may be settled, on a 1-for-1 basis, only in shares of common stock. Fractional amounts have been rounded to the nearest whole number

	/s/ Mark Parker	08/11/2026
	** 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)