[Form 4] Hydrofarm Holdings Group, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Mark S. Parker, President of Hydrofarm Holdings Group, Inc. (HYFM), reported a routine withholding transaction related to the vesting of restricted stock units. On 08/11/2025 1,667 stock-settled restricted stock units vested and 771 shares were withheld to satisfy tax withholding obligations at an indicated price of $4.49 per share. After the withholding, Mr. Parker beneficially owns 21,370 shares of common stock. The transaction was reported on a Form 4 and reflects a direct, non-derivative change in ownership tied to RSU vesting rather than an open-market sale.

Positive

• No open-market sale recorded; shares were withheld solely to satisfy tax obligations from RSU vesting
• Reporting officer retains direct ownership of 21,370 common shares after the withholding

Negative

• None.

Insights

Corporate Governance Expert

TL;DR: Routine RSU vesting with share withholding for taxes; no open-market sale and no immediate governance change.

The Form 4 documents a common administrative action: 1,667 RSUs vested and 771 shares were withheld to cover taxes at $4.49 per share, leaving 21,370 shares beneficially owned by the reporting officer. This does not indicate a divestiture or change in control and is consistent with standard compensation mechanics. For governance monitoring, investors typically view such withholdings as non-disruptive because they reflect compensation settlement rather than a decision to liquidate holdings.

Securities Analyst

TL;DR: Non-material insider activity tied to compensation; unlikely to affect valuation or signal company-specific news.

The filing reports a tax-withholding event on RSU vesting rather than a sale: 1,667 RSUs vested on 08/11/2025, 771 shares withheld at $4.49, leaving 21,370 shares held directly. This is a routine issuance-and-withholding pattern and should be classified as not impactful to investors absent other concurrent transactions or material disclosures.

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

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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 PA 19555

(City) (State) (Zip)

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

3. Date of Earliest Transaction (Month/Day/Year)
08/11/2025

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

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

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

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	08/11/2025		F		771(1)	D	$4.49	21,370	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.

Remarks:

	/s/ Mark Parker	08/13/2025
	** 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.

FAQ

What transaction did Mark S. Parker report on Form 4 for HYFM?

The Form 4 reports the vesting of 1,667 stock-settled RSUs and the withholding of 771 shares to satisfy tax obligations.

How many shares were withheld and at what price?

771 shares were withheld at an indicated price of $4.49 per share.

How many HYFM shares does the reporting person beneficially own after the transaction?

After the withholding, the reporting person beneficially owns 21,370 shares of common stock.

What was the date of the reported transaction?

The transaction date reported on the Form 4 is 08/11/2025.

What is the reporting person’s relationship to Hydrofarm (HYFM)?

The reporting person, Mark S. Parker, is identified as an Officer and the President of Hydrofarm.