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HDSN · NASDAQ · Chemicals - Specialty

Hudson Technologies (HDSN)

Sells and reclaims refrigerants for commercial, industrial, and refrigeration systems.

$5.21

Pre-market+0.08 (+1.66%)

At close$5.13(−0.29%)

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Breakdown13F · 13D/G · Form 4

Institutions155 holders · as of Jun 30, 2026	75.39%	31.72M shares
Insiders13 holders · as of Jun 22, 2026	15.93%	6.70M shares
Strategic holders1 holder · as of Feb 14, 2022	9.72%	4.09M shares
Adds to	101.04%

42.07M company shares as of Sep 3, 2026 · institutions as of Jun 30, 2026 · holders as of their latest filing

These groups come from separate filings that can overlap, so they add to 101.04%; nothing is left for Other.

Top shareholders13F · 13D/G · Form 4

Holder	Stake	Shares	Evidence
Hartree Partners, LPInstitution	10.49%	4.41M	13Fas of Jun 30, 2026
Cooper Creek Partners Management LLCStrategic	9.72%	4.09M	13Gfiled Feb 14, 2022 ↗
ArrowMark Colorado Holdings LLCInstitution	9.27%	3.90M	13D/Gfiled Feb 14, 2019 ↗
(a) Name of IssuerInsider	8.97%	3.77M	13Gfiled May 4, 2021 ↗
Westerly Capital Management, LLCInstitution	8.03%	3.38M	13Fas of Jun 30, 2026
BlackRock, Inc.Institution	6.75%	2.84M	13Fas of Jun 30, 2026
Brian F. Coleman¹Insiderother: Former Director	4.90%	2.61M	13Dfiled Dec 15, 2025 ↗
DNB Asset Management ASInstitution	4.70%	1.98M	13G/Afiled Jan 24, 2019 ↗
Dimensional Fund Advisors LPInstitution	4.68%	1.97M	13Fas of Jun 30, 2026
Perritt Capital Management, Inc.Institution	4.00%	1.68M	13D/Gfiled Feb 14, 2017 ↗
William Blair Investment Management, LLCInstitution	3.96%	1.66M	13G/Afiled Sep 9, 2016 ↗
Vanguard Capital Management LLCInstitution	3.93%	1.65M	13Fas of Jun 30, 2026
Renaissance Technologies LLCInstitution	3.43%	1.44M	13Fas of Jun 30, 2026
American Century Companies IncInstitution	2.78%	1.17M	13Fas of Jun 30, 2026
Geode Capital Management, LLCInstitution	2.37%	995,011	13Fas of Jun 30, 2026
State Street CorpInstitution	2.13%	895,776	13Fas of Jun 30, 2026
Arrowstreet Capital, Limited PartnershipInstitution	1.85%	777,989	13Fas of Jun 30, 2026
Caspian Capital LPInstitution	1.73%	728,306	13Fas of Jun 30, 2026
Qube Research & Technologies LtdInstitution	1.72%	721,847	13Fas of Jun 30, 2026
Citadel Advisors LLCInstitution	1.37%	574,266	13Fas of Jun 30, 2026
Jacobs Levy Equity Management, IncInstitution	1.20%	506,591	13Fas of Jun 30, 2026
Bridgeway Capital Management, LLCInstitution	1.18%	494,432	13Fas of Jun 30, 2026
Nuveen, LLCInstitution	1.13%	476,540	13Fas of Jun 30, 2026
Marshall Wace, LLPInstitution	1.13%	474,354	13Fas of Jun 30, 2026
D. E. Shaw & Co., Inc.Institution	0.97%	409,591	13Fas of Jun 30, 2026

Brian F. Coleman's transaction reports restate only vehicles that traded; the 2021 ownership statement (2.61M) less the 552.7K net shares sold since is used instead.

13F — a manager's quarterly holdings · 13D/13G — an ownership statement filed at 5% or more

Institutions13F, as of Jun 30, 2026

155 holders · 31.72M shares · 27 new positions · 73 increased · 52 reduced · 34 closed

Holder	Shares	% outstanding	Chg q/q	Filed
Hartree Partners, LP	4.41M	10.49%	+611.9K	Aug 12, 2026
Westerly Capital Management, LLC	3.38M	8.03%	+205.0K	Aug 14, 2026
BlackRock, Inc.	2.84M	6.75%	−22.3K	Aug 7, 2026
Dimensional Fund Advisors LP	1.97M	4.68%	−180.4K	Aug 11, 2026
Vanguard Capital Management LLC	1.65M	3.93%	−5.9K	Aug 13, 2026
Renaissance Technologies LLC	1.44M	3.43%	−62.1K	Aug 13, 2026
American Century Companies Inc	1.17M	2.78%	−318.3K	Aug 12, 2026
Geode Capital Management, LLC	995.0K	2.37%	+46.5K	Aug 12, 2026

Ownership statements13D/G · 5% or more, as filed

Holder	% of class	Shares	Form	Filed
Hartree Partners, LP	11.80%	4.97M	13G	Jul 2, 2026 ↗
Westerly Capital Management, LLC	6.00%	2.60M	13G	Jun 24, 2025 ↗

Insider tradesForm 4

Latest trades

Date	Insider	Type	Shares	Avg price	Owned after
Aug 25, 2026	Hartree Partners, LP10 percent owner	Purchase	91,166	$5.50	5,200,000
Aug 24, 2026	Hartree Partners, LP10 percent owner	Purchase	9,446	$5.50	5,108,834
Aug 12, 2026	Hartree Partners, LP10 percent owner	Purchase	5,198	$5.50	5,099,388
Jul 29, 2026	Hartree Partners, LP10 percent owner	Purchase	52,104	$5.99	5,094,190
Jul 20, 2026	Hartree Partners, LP10 percent owner	Purchase	17,842	$5.99	4,994,378
Jul 21, 2026	Hartree Partners, LP10 percent owner	Purchase	47,708	$5.99	5,042,086
Jul 6, 2026	Hartree Partners, LP10 percent owner	Purchase	4,634	$5.99	4,975,936
Jul 7, 2026	Hartree Partners, LP10 percent owner	Purchase	600	$5.99	4,976,536
Jun 30, 2026	Hartree Partners, LP10 percent owner	Purchase	204,789	$5.68	4,411,889
Jul 1, 2026	Hartree Partners, LP10 percent owner	Purchase	288,111	$5.88	4,700,000

CongressHouse and Senate disclosures

Not reported.