Hudson Technologies

HDSN · NASDAQ

$5.31+$0.165 (+3.21%)TodayMarket closed · Oct 20, 7:30 PM ET

Prev close $5.14

Who owns HDSN

Largest institutional holders, from their latest 13F filings

The 10 largest institutions hold 56.9% of HDSN’s shares.

Hartree Partners, LP13.7%
Lazarus (Ernest)9.4%
Westerly Capital Management LLC8.0%
BlackRock Institutional Trust Company, N.A.6.2%
Next 6 largest institutions19.6%
All other shareholders43.1%

Top institutional holders of HDSN
Holder	Shares	% of shares	Change, last filing	Filed
Hartree Partners, LP	5.76M	13.69%	+105.81K	Aug 25, 2026
Lazarus (Ernest)	3.96M	9.41%	+0	Apr 16, 2026
Westerly Capital Management LLC	3.38M	8.03%	+205.00K	Jun 30, 2026
BlackRock Institutional Trust Company, N.A.	2.61M	6.20%	+15.16K	Jun 30, 2026
Dimensional Fund Advisors, L.P.	1.97M	4.68%	−180.40K	Jun 30, 2026
Vanguard Capital Management, LLC	1.65M	3.93%	−5.89K	Jun 30, 2026
Renaissance Technologies LLC	1.44M	3.43%	−62.13K	Jun 30, 2026
American Century Investment Management, Inc.	1.17M	2.78%	−318.31K	Jun 30, 2026
Coleman (Brian F)	1.02M	2.41%	+104.15K	Apr 16, 2026
Geode Capital Management, L.L.C.	995.01K	2.37%	+46.47K	Jun 30, 2026

Largest mutual fund holders

Top mutual fund holders of HDSN
Holder	Shares	% of shares	Change, last filing	Filed
Vanguard Total Stock Market Index Fund	1.19M	2.83%	+0	Jul 31, 2026
iShares Russell 2000 ETF	961.96K	2.29%	−4.20K	Jul 31, 2026
Avantis US Small Cap Value ETF	877.54K	2.09%	−97.80K	Aug 31, 2026
DFA US Small Cap Value Portfolio	548.63K	1.30%	+39.58K	May 31, 2026
Vanguard Extended Market Index Fund	423.21K	1.01%	+0	Jul 31, 2026

Insider trades

Form 4 filings by officers, directors and large holders

Over the last 6 months, insiders bought $6.76M (27 trades) of HDSN on the open market, with no sales.

Latest HDSN insider transactions
Insider	Date	Type	Shares	Price	Value
Hartree Partners, LP	Sep 24, 2026	Buy	118.55K	$5.10	$604.45K
Hartree Partners, LP	Sep 23, 2026	Buy	11.01K	$5.10	$56.17K
Hartree Partners, LP	Sep 21, 2026	Buy	2.50K	$5.10	$12.76K
Hartree Partners, LP	Sep 16, 2026	Buy	11.14K	$5.10	$56.79K
Hartree Partners, LP	Sep 2, 2026	Buy	5.32K	$5.10	$27.12K
Hartree Partners, LP	Aug 25, 2026	Buy	91.17K	$5.50	$501.09K
Hartree Partners, LP	Aug 24, 2026	Buy	9.45K	$5.50	$51.95K
Hartree Partners, LP	Aug 12, 2026	Buy	5.20K	$5.50	$28.59K
Hartree Partners, LP	Jul 29, 2026	Buy	52.10K	$5.99	$312.10K
Hartree Partners, LP	Jul 21, 2026	Buy	47.71K	$5.99	$285.74K

Short interest

Settled Sep 30, 2026

Shares short: 2.69M
Days to cover: 5.94
% of shares outstanding: 6.39%
Average daily volume: 452.18K
Change since last report: −5.2%

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