Buy4

HYDROFARM HOLDINGS GROUP, INC.

HYFM

Total Value

$37.2K

Net $20.0K bought

Filing Date

Oct 29, 2026

1 transaction

Purchases

$20.0K

1 transaction

Trade Summary

On Oct 27, 2026, PARKER MARK S, President, purchased $37.2K of HYDROFARM HOLDINGS GROUP, INC. (HYFM) across 1 transaction. The filing covers Common Stock, $0.0001 par value per share and reflects net buying of $20.0K. Reported prices ranged from $0.78 to $0.91. Insider transactions are sourced from SEC Form 4 disclosures and should be reviewed alongside company fundamentals and the insider's broader trading history.

Price at the Time of the Trade

HYFM daily price with the insider's purchase marked at $0.91.

Bought near the 6-month low · the stock trades 22% lower today.

Price data is delayed and provided for context only — not investment advice.

Insider Information

Name: PARKER MARK S
Role: President
Location: SHOEMAKERSVILLE, PA

Filing Details

Filing Date: Oct 29, 2026
Transaction Date: Oct 27, 2026
Accession Number: 0001437749-26-034002
Form Type: 4
Net Trading Amount: $20.0K

Non-Derivative Transactions

Date	Security	Shares	Price	Type	Value
Oct 27, 2026	Common Stock, $0.0001 par value per share	22,099	$0.91	Purchase	$20.0K

Derivative Transactions

Date	Security	Shares	Exercise Price	Type	Value
Oct 27, 2026	HYFM derivative	22,099	$0.78	Purchase	$17.2K

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Footnotes

(F1)On October 27, 2026, Issuer entered into a Securities Purchase Agreement (the "Purchase Agreement") with the purchasers signatory thereto and consummated the transactions contemplated thereunder. Pursuant to the Purchase Agreement, Issuer agreed to issue and sell to Reporting Person (i) in a registered direct offering 3,837 shares of Common Stock, $0.0001 par value per share ("Common Stock") and (ii) in a concurrent private placement 18,262 shares of Common Stock and 22,099 accompanying common stock purchase warrants to purchase shares of Common Stock (the "Common Warrants").
(F2)The Common Warrants may be exercised on a one-for-one basis for shares of Common Stock at an exercise price of $0.78 per share of Common Stock, to the extent that after giving effect to such exercise the Reporting Person would beneficially own, for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, no more than 9.99% of the outstanding shares of Common Stock. The Common Warrants will expire five and a half years following the date of issuance.

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

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)
10/27/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock, $0.0001 par value per share	10/27/2026		P⁽¹⁾		22,099	A	$0.905	40,657	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Warrant	$0.78	10/27/2026		P⁽¹⁾		22,099		⁽²⁾	⁽²⁾	Common Stock, $0.0001 par value per share	22,099	⁽¹⁾	22,099	D

Explanation of Responses:

1. On October 27, 2026, Issuer entered into a Securities Purchase Agreement (the "Purchase Agreement") with the purchasers signatory thereto and consummated the transactions contemplated thereunder. Pursuant to the Purchase Agreement, Issuer agreed to issue and sell to Reporting Person (i) in a registered direct offering 3,837 shares of Common Stock, $0.0001 par value per share ("Common Stock") and (ii) in a concurrent private placement 18,262 shares of Common Stock and 22,099 accompanying common stock purchase warrants to purchase shares of Common Stock (the "Common Warrants").

2. The Common Warrants may be exercised on a one-for-one basis for shares of Common Stock at an exercise price of $0.78 per share of Common Stock, to the extent that after giving effect to such exercise the Reporting Person would beneficially own, for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, no more than 9.99% of the outstanding shares of Common Stock. The Common Warrants will expire five and a half years following the date of issuance.

	/s/ Mark Parker	10/29/2026
	** 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 as rendered by the SEC from accession 0001437749-26-034002.

HYDROFARM HOLDINGS GROUP, INC.

Trade Summary

Price at the Time of the Trade

Company Information

Insider Information

Filing Details

Non-Derivative Transactions

Derivative Transactions

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Footnotes

SEC Form 4

SEC Filing

Price at the Time of the Trade

SEC Form 4