Mark S. Parker

CIK: 0001915363

Transaction Breakdown

Open Market Buys (P)1 (8.3%)

High conviction signal

Open Market Sales (S)0 (0.0%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)2 (16.7%)

Compensation grants

Other (G, F, J, C, D, …)9 (75.0%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

HYFM

HYDROFARM HOLDINGS GROUP, INC.

Officer

Discretionary Trading P&L

Holdings

Transaction History (12 total)

HYFM
HYDROFARM HOLDINGS GROUP, INC.
Oct 27, 2026
Purchase(P)
Direct
22.1K shares at avg. $0.91$20K
HYFM
HYDROFARM HOLDINGS GROUP, INC.
Aug 8, 2026
Tax Payment(F)
Direct
740 shares at avg. $1.60$1K
HYFM
HYDROFARM HOLDINGS GROUP, INC.
Jan 6, 2026
Tax Payment(F)
Direct
1.7K shares at avg. $1.51$3K
HYFM
HYDROFARM HOLDINGS GROUP, INC.
Aug 18, 2025
Tax Payment(F)
Direct
370 shares at avg. $4.51$2K
HYFM
HYDROFARM HOLDINGS GROUP, INC.
Aug 11, 2025
Tax Payment(F)
Direct
771 shares at avg. $4.49$3K
HYFM
HYDROFARM HOLDINGS GROUP, INC.
Apr 8, 2025
Tax Payment(F)
Direct
1.4K shares at avg. $1.78$2K
HYFM
HYDROFARM HOLDINGS GROUP, INC.
Feb 28, 2025
Award(A)
Direct
2.8K shares-
HYFM
HYDROFARM HOLDINGS GROUP, INC.
Feb 26, 2025
Tax Payment(F)
Direct
84 shares at avg. $5.39$452.76
HYFM
HYDROFARM HOLDINGS GROUP, INC.
Jan 1, 2025
Award(A)
Direct
100K shares-
HYFM
HYDROFARM HOLDINGS GROUP, INC.
Nov 1, 2024
Tax Payment(F)
Direct
138 shares at avg. $0.68$93.426
HYFM
HYDROFARM HOLDINGS GROUP, INC.
Oct 1, 2024
Tax Payment(F)
Direct
134 shares at avg. $0.69$92.326
HYFM
HYDROFARM HOLDINGS GROUP, INC.
Sep 3, 2024
Tax Payment(F)
Direct
134 shares at avg. $0.44$58.357

		Type	Shares	Price		Ownership
Oct 27, 2026	HYFM HYDROFARM HOLDINGS GROUP, INC.	Purchase(P)	22,099	$0.91	$20,000	Direct
Aug 8, 2026	HYFM HYDROFARM HOLDINGS GROUP, INC.	Tax Payment(F)	740	$1.60	$1,184	Direct
Jan 6, 2026	HYFM HYDROFARM HOLDINGS GROUP, INC.	Tax Payment(F)	1,672	$1.51	$2,525	Direct
Aug 18, 2025	HYFM HYDROFARM HOLDINGS GROUP, INC.	Tax Payment(F)	370	$4.51	$1,669	Direct
Aug 11, 2025	HYFM HYDROFARM HOLDINGS GROUP, INC.	Tax Payment(F)	771	$4.49	$3,462	Direct
Apr 8, 2025	HYFM HYDROFARM HOLDINGS GROUP, INC.	Tax Payment(F)	1,380	$1.78	$2,456	Direct
Feb 28, 2025	HYFM HYDROFARM HOLDINGS GROUP, INC.	Award(A)	2,751	-	-	Direct
Feb 26, 2025	HYFM HYDROFARM HOLDINGS GROUP, INC.	Tax Payment(F)	84	$5.39	$453	Direct
Jan 1, 2025	HYFM HYDROFARM HOLDINGS GROUP, INC.	Award(A)	100,000	-	$0	Direct
Nov 1, 2024	HYFM HYDROFARM HOLDINGS GROUP, INC.	Tax Payment(F)	138	$0.68	$93	Direct
Oct 1, 2024	HYFM HYDROFARM HOLDINGS GROUP, INC.	Tax Payment(F)	134	$0.69	$92	Direct
Sep 3, 2024	HYFM HYDROFARM HOLDINGS GROUP, INC.	Tax Payment(F)	134	$0.44	$58	Direct

1-12 of 12 transactions

About PARKER MARK S

PARKER MARK S (SEC CIK 0001915363) files insider reports with the SEC as President of HYDROFARM HOLDINGS GROUP, INC. (HYFM).

Signal8 holds 12 ownership filings by PARKER MARK S, all Form 4s, filed between Sep 4, 2024 and Oct 29, 2026. Those filings report 12 transactions, from Sep 3, 2024 to Oct 27, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on PARKER MARK S's filings is in SHOEMAKERSVILLE, PA.

Recent filings by PARKER MARK S

Oct 27, 2026: Open-market purchase of HYFM shares (Form 4, code P).
Aug 8, 2026: Tax withholding of HYFM shares (Form 4, code F).
Jan 6, 2026: Tax withholding of HYFM shares (Form 4, code F).
Aug 18, 2025: Tax withholding of HYFM shares (Form 4, code F).
Aug 11, 2025: Tax withholding of HYFM shares (Form 4, code F).

Other insiders filing for HYDROFARM HOLDINGS GROUP, INC. (HYFM)

O'Brien Kevin Patrick, Chief Financial Officer
Toler William Douglas, Chief Executive Officer
Yetter Richard Christopher, Director
Ackerman Erica, CAO and Corporate Controller
Chung Patrick, Director
Persofsky Renah, Director

How to read Form 4 transaction codes