Hydrofarm Holdings Group, Inc.: which funds bought and sold

Institutions that bought and sold Hydrofarm Holdings Group shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.

Between March 31, 2026 and June 30, 2026, 7 institutions that filed 13F reports for both quarters added to or opened positions in Hydrofarm Holdings Group, and 5 cut or closed them. Together they added a net 24K shares, +8.5% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 22K shares (+30.7%); index fund managers were net sellers of 29K shares (−15.5%). 4 opened a new position and 2 sold out entirely.

Bought, Q2 2026 7 institutions, 4 of them new holders Sold, Q2 2026 5 institutions, 2 of them sold out

Net change, all compared +24K shares (+8.5%)

Net change, active managers +22K shares (+30.7%), 1 bought, 1 sold

Buyers versus sellers

institutions compared, 23

7 bought 11 5 sold

Active managers and hedge funds 1 bought · 1 sold · +22K

Index fund managers 0 bought · 1 sold · −29K

Other institutions 6 bought · 3 sold · +30K

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
Citadel Advisors LLC Hedge fund	+24K New position	24K	$20,380
Virtu Financial LLC	+15K New position	15K	$12,000
Compass Ion Advisors, LLC	+11K New position	11K	$9,137
Susquehanna International Group, LLP	+11K New position	11K	$9,018
UBS Group AG	+3,369 +350.2%	4,331	$3,681
Tower Research Capital LLC (TRC)	+2,528 +86.8%	5,439	$4,622
Osaic Holdings, Inc.	+282 +127.6%	503	$426

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Geode Capital Management, LLC Index funds	−29K −46.2%	34K	$28,608
Xtx Topco Ltd	−12K Sold out	0	—
Renaissance Technologies LLC Hedge fund	−1,800 −2.5%	70K	$59,788
BNP Paribas Financial Markets	−30 −13.2%	198	$168
Advisory Services Network, LLC	−7 Sold out	0	—

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Renaissance Technologies LLC Hedge fund	−1,800 −2.5%	70K	$59,788

New positions

largest by value

Institution	Shares	Value June 30, 2026
Citadel Advisors LLCHedge fund	24K	$20,380
Virtu Financial LLC	15K	$12,000
Compass Ion Advisors, LLC	11K	$9,137
Susquehanna International Group, LLP	11K	$9,018

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Xtx Topco Ltd	12K	$12,020
Advisory Services Network, LLC	7	$7

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 21
Ten largest holders: 95.1%
Index fund managers: 52.1%
Active managers and hedge funds: 31.1%

Buying and selling by type of institution, March 31, 2026 to June 30, 2026
Type	Bought	Sold	New	Sold out	Net change in shares	Net %
Active managers and hedge funds	1	1	1	0	+22K	+30.7%
Index fund managers	0	1	0	0	−29K	−15.5%
Other institutions	6	3	3	2	+30K	+149.4%

Active managers and hedge funds: a list we maintain of about 400 well-known stock-picking firms and hedge funds, matched by SEC registration number (CIK) and checked against the filer names each quarter. Index fund managers: the large index houses, such as BlackRock, Vanguard, State Street, Geode and Northern Trust. Every other filer (banks, brokers, wealth managers, pension funds, insurers and firms not on the list) counts as another institution. A firm that files under several SEC registrations appears once for each.

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