Insider Transactions Reported by 17 Insiders of HUDSON TECHNOLOGIES INC /NY

Symbol: HDSN on Nasdaq
Location: Pearl River, NY

Key facts

HDSN - HUDSON TECHNOLOGIES INC /NY has 17 insiders with reported activity on this page.
Net insider value flow over the last year: -$3,354,943.
Recent transaction rows are available for direct filing-level review.

Change

Buy value: $233,154; sell value: $3,588,096.
Net share flow: -438,266.

Research use

This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.

Evidence

Filed on Form 4

Issuer insider activity is sourced from SEC Forms 3, 4, and 5.

See Original Filing

Insider trading overview

Last 12 months

Net insider flow leans to selling over the last 12 months. Net value: -$3,354,943.

Buys

$233,154

Shares: 46,350

Insiders: 9

Sells

$3,588,097

Shares: 484,616

Insiders: 1

Net

-$3,354,943

Shares: -438,266

Insiders: 8

Window (months)	Buy shares	Sell shares	Buy $	Sell $	Net $
0-3	42,850	0	$209,407	$0	+$209,407
3-6	0	484,616	$0	$3,588,097	-$3,588,097
6-9	3,500	0	$23,748	$0	+$23,748
9-12	0	0	$0	$0	$0

HUDSON TECHNOLOGIES INC /NY executives and other stock owners filed with the SEC include:

Name	Relationship	Holdings Value	Past Year Net Change	Change %	Valuation	Report Date
Brian F. Coleman	Former Director	$3,161,271	-$3,588,097	-53%	Filing P/S	05 Dec 2025
Dominic J. Monetta	Director	$2,690,399			Mixed	13 Sep 2021
Otto C. Morch	Director	$1,157,600			Mixed	05 Jul 2022
Vincent P. Abbatecola	Director	$1,151,740	+$23,748	+2.1%	Filing P/S	17 Nov 2025
Kathleen Houghton	Sr. VP-Sales and Marketing, Director	$1,126,187			Mixed	08 Jan 2026
Eric A. Prouty	Director	$744,643	+$24,200	+3.4%	Filing P/S	13 May 2026
Robert Stoody	Senior VP - Operations	$479,821			Mixed	30 Jan 2026
Kenneth Gaglione	President and CEO, Director	$244,997	+$24,475	+11%	Mixed	13 May 2026
Richard Parrillo	Director	$127,207	+$73,071	+135%	Filing P/S	14 May 2026
Loan Nguyen Mansy	Director	$127,207	+$24,814	+24%	Filing P/S	14 May 2026
Richard Damian Caruso	Director	$87,092			Mixed	01 Jul 2021
Nicole E. Bulgarino	Director	$53,527	+$2,665	+5.2%	Filing P/S	14 May 2026
Alan Sheriff	Director	$45,166	+$25,350	+128%	Filing P/S	13 May 2026
Jeffrey R. Feeler	Director	$45,091	+$25,092	+125%	Filing P/S	14 May 2026
Brian J. Bertaux	Chief Financial Officer	$9,740	+$9,740	+100%	Filing P/S	19 May 2026
Stephen P. Mandracchia	Director				Mixed	14 Jun 2023
Nat Krishnamurti	Cfo				Mixed	27 Feb 2024

Top shareholders of HUDSON TECHNOLOGIES INC /NY (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.

Methodology: rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Holder	Source	Role / Reporting	Ownership %	Shares	Holdings Value	12M Net Δ	As of	Details
Hartree Partners, LP	13D/G 13F	Company	8.7%	3,800,000	$26,030,000	-$1,370,000	08 Dec 2025	13D/G 13F
WESTERLY CAPITAL MANAGEMENT, LLC	13F 13D/G	Company	5.9% from 13D/G	3,175,000	$18,669,000	—	31 Mar 2026	13F 13D/G
DIMENSIONAL FUND ADVISORS LP	13F 13D/G	Company	5.1% from 13D/G	2,148,311	$12,631,109	—	31 Mar 2026	13F 13D/G
Vincent P. Abbatecola	3/4/5	Director	0.4%	169,748	$1,151,740	+$23,748	17 Nov 2025	3/4/5
Kathleen Houghton	3/4/5	Sr. VP-Sales and Marketing, Director	0.38%	158,618	$1,126,187	—	08 Jan 2026	3/4/5
Eric A. Prouty	3/4/5	Director	0.37%	153,852	$744,643	+$24,200	13 May 2026	3/4/5
Robert Stoody	3/4/5	Senior VP - Operations	0.17%	70,047	$479,821	—	30 Jan 2026	3/4/5
Alan Sheriff	3/4/5	Director	0.02%	9,265	$45,166	+$25,350	13 May 2026	3/4/5
Jeffrey R. Feeler	3/4/5	Director	0.02%	9,165	$45,091	+$25,092	14 May 2026	3/4/5
BlackRock, Inc.	13F	Company	6.8%	2,862,539	$16,831,729	—	31 Mar 2026	13F
VANGUARD CAPITAL MANAGEMENT LLC	13F	Company	3.9%	1,660,146	$9,761,658	—	31 Mar 2026	13F
RENAISSANCE TECHNOLOGIES LLC	13F	Company	3.6%	1,504,250	$8,844,990	—	31 Mar 2026	13F
AMERICAN CENTURY COMPANIES INC	13F	Company	3.5%	1,487,774	$8,748,111	—	31 Mar 2026	13F
NEW SOUTH CAPITAL MANAGEMENT INC	13F	Company	2.9%	1,241,223	$7,298,391	—	31 Mar 2026	13F
GEODE CAPITAL MANAGEMENT, LLC	13F	Company	2.3%	948,546	$5,578,712	—	31 Mar 2026	13F
STATE STREET CORP	13F	Company	2.1%	897,873	$5,279,493	—	31 Mar 2026	13F
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	13F	Company	2.1%	881,235	$5,181,662	—	31 Mar 2026	13F
CASPIAN CAPITAL LP	13F	Company	1.7%	728,306	$4,282,439	—	31 Mar 2026	13F
SEGALL BRYANT & HAMILL, LLC	13F	Company	1.5%	628,341	$3,694,645	—	31 Mar 2026	13F
BRIDGEWAY CAPITAL MANAGEMENT, LLC	13F	Company	1.2%	498,109	$2,928,881	—	31 Mar 2026	13F
MORGAN STANLEY	13F	Company	1.1%	471,947	$2,775,047	—	31 Mar 2026	13F
CITADEL ADVISORS LLC	13F	Company	0.98%	412,750	$2,426,970	—	31 Mar 2026	13F
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO	13F	Company	0.97%	410,099	$2,411,382	—	31 Mar 2026	13F
NORTHERN TRUST CORP	13F	Company	0.95%	399,363	$2,348,253	—	31 Mar 2026	13F
Qube Research & Technologies Ltd	13F	Company	0.88%	370,876	$2,180,751	—	31 Mar 2026	13F
D. E. Shaw & Co., Inc.	13F	Company	0.85%	358,682	$2,109,050	—	31 Mar 2026	13F
AQR CAPITAL MANAGEMENT LLC	13F	Company	0.82%	344,304	$2,024,507	—	31 Mar 2026	13F
LAZARD ASSET MANAGEMENT LLC	13F	Company	0.77%	325,915	$1,916,380	—	31 Mar 2026	13F
683 Capital Management, LLC	13F	Company	0.77%	325,000	$1,911,000	—	31 Mar 2026	13F
JB CAPITAL PARTNERS LP	13F	Company	0.73%	306,200	$1,800,456	—	31 Mar 2026	13F
Bank of New York Mellon Corp	13F	Company	0.67%	282,435	$1,660,717	—	31 Mar 2026	13F
TWO SIGMA INVESTMENTS, LP	13F	Company	0.65%	272,925	$1,604,799	—	31 Mar 2026	13F
VANGUARD PORTFOLIO MANAGEMENT LLC	13F	Company	0.64%	268,536	$1,578,992	—	31 Mar 2026	13F
VANGUARD FIDUCIARY TRUST CO	13F	Company	0.58%	242,866	$1,428,052	—	31 Mar 2026	13F
MARSHALL WACE, LLP	13F	Company	0.52%	219,271	$1,289,313	—	31 Mar 2026	13F
KESTREL INVESTMENT MANAGEMENT CORP	13F	Company	0.48%	200,750	$1,180,410	—	31 Mar 2026	13F
GOLDMAN SACHS GROUP INC	13F	Company	0.47%	197,932	$1,163,840	—	31 Mar 2026	13F
Empowered Funds, LLC	13F	Company	0.46%	194,555	$1,143,983	—	31 Mar 2026	13F
JACOBS LEVY EQUITY MANAGEMENT, INC	13F	Company	0.42%	178,933	$1,052,126	—	31 Mar 2026	13F
Numerai GP LLC	13F	Company	0.42%	177,292	$1,042,477	—	31 Mar 2026	13F
MARATHON CAPITAL MANAGEMENT	13F	Company	0.41%	174,325	$1,025,031	—	31 Mar 2026	13F
O'SHAUGHNESSY ASSET MANAGEMENT, LLC	13F	Company	0.41%	170,825	$1,004,451	—	31 Mar 2026	13F
GRIMES & Co WEALTH MANAGEMENT, LLC	13F	Company	0.38%	158,618	$932,674	—	31 Mar 2026	13F
Russell Investments Group, Ltd.	13F	Company	0.37%	154,393	$907,830	—	31 Mar 2026	13F
Pacific Ridge Capital Partners, LLC	13F	Company	0.35%	146,930	$863,948	—	31 Mar 2026	13F
FIRST TRUST ADVISORS LP	13F	Company	0.34%	145,083	$853,088	—	31 Mar 2026	13F
WEDGE CAPITAL MANAGEMENT L L P/NC	13F	Company	0.34%	144,736	$851,048	—	31 Mar 2026	13F
CREDIT AGRICOLE S A	13F	Individual	0.33%	140,000	$823,200	—	31 Mar 2026	13F
KBC Group NV	13F	Company	0.29%	123,001	$723,000	—	31 Mar 2026	13F
PRUDENTIAL FINANCIAL INC	13F	Company	0.29%	121,740	$715,831	—	31 Mar 2026	13F

Recent Insider Transactions by Companies or Individuals for HUDSON TECHNOLOGIES INC /NY

Showing up to 300 most recent insider transactions from the last 12 months.

Insider	Symbol	Class	Transaction	%	Value $	* Price $	Shares	Shares Owned	Date	Ownership
Brian J. Bertaux	HDSN	Common Stock	Purchase		$9,740	$4.87	2,000	2,000	19 May 2026	Direct
Loan Nguyen Mansy	HDSN	Common Stock	Purchase	24.3%	$24,814	$4.96	5,000	25,595	14 May 2026	Direct
Richard Parrillo	HDSN	Common Stock	Purchase	24.3%	$24,814	$4.96	5,000	25,595	14 May 2026	Direct
Nicole E. Bulgarino	HDSN	Common Stock	Purchase	5.24%	$2,665	$4.84	550	11,048	14 May 2026	Direct
Jeffrey R. Feeler	HDSN	Common Stock	Purchase	125.5%	$25,092	$4.92	5,100	9,165	14 May 2026	Direct
Richard Parrillo	HDSN	Common Stock	Purchase	5.38%	$48,257	$4.83	10,000	195,746	13 May 2026	Direct
Eric A. Prouty	HDSN	Common Stock	Purchase	3.36%	$24,200	$4.84	5,000	153,852	13 May 2026	Direct
Alan Sheriff	HDSN	Common Stock	Purchase	127.9%	$25,350	$4.88	5,200	9,265	13 May 2026	Direct
Kenneth Gaglione	HDSN	Common Stock	Purchase		$24,475	$4.90	5,000	5,000	13 May 2026	By the Gaglione Trust
Alan Sheriff	HDSN	Common Stock	Award				4,065	4,065	10 Apr 2026	Direct
Jeffrey R. Feeler	HDSN	Common Stock	Award				4,065	4,065	10 Apr 2026	Direct
Kathleen Houghton	HDSN	Common Stock	Tax liability	-46.5%			-101,052	116,290	08 Jan 2026	Direct
Kathleen Houghton	HDSN	Common Stock	Options Exercise				218,507	193,000	08 Jan 2026	Direct
Kathleen Houghton	HDSN	Stock Option	Options Exercise	-100%			-218,507	0	08 Jan 2026	Direct
Brian F. Coleman	HDSN	Common Stock	Sale	-53.2%	$3,588,097	$7.40	-484,616	426,968	05 Dec 2025	Direct
Kenneth Gaglione	HDSN	Stock Option	Award				216,309	216,309	24 Nov 2025	Direct
Vincent P. Abbatecola	HDSN	Common Stock	Purchase	2.11%	$23,748	$6.78	3,500	169,748	17 Nov 2025	Direct
Vincent P. Abbatecola	HDSN	Common Stock	Tax liability	-2.07%			-3,519	166,248	24 Sep 2025	Direct
Vincent P. Abbatecola	HDSN	Common Stock	Options Exercise	2.87%			4,744	169,767	24 Sep 2025	Direct
Vincent P. Abbatecola	HDSN	Stock Options	Options Exercise	-100%			-4,744	0	24 Sep 2025	Direct
Eric A. Prouty	HDSN	Common Stock	Tax liability	-2.43%			-3,713	148,852	31 Jul 2025	Direct
Eric A. Prouty	HDSN	Common Stock	Options Exercise	3.21%			4,744	152,565	31 Jul 2025	Direct
Eric A. Prouty	HDSN	Stock Options	Options Exercise	-100%			-4,744	0	31 Jul 2025	Direct
Nicole E. Bulgarino	HDSN	Common Stock	Award	43.5%			3,182	10,498	18 Jun 2025	Direct
Nicole E. Bulgarino	HDSN	Stock Options	Award				13,698	13,698	18 Jun 2025	Direct
Loan Nguyen Mansy	HDSN	Common Stock	Award	44.7%			6,365	20,595	18 Jun 2025	Direct
Loan Nguyen Mansy	HDSN	Stock Options	Award				13,698	13,698	18 Jun 2025	Direct
Vincent P. Abbatecola	HDSN	Common Stock	Award	1.97%			3,182	165,023	18 Jun 2025	Direct
Vincent P. Abbatecola	HDSN	Stock Options	Award				13,698	13,698	18 Jun 2025	Direct
Richard Parrillo	HDSN	Common Stock	Award	1.74%			3,182	185,746	18 Jun 2025	Direct
Richard Parrillo	HDSN	Stock Options	Award				13,698	13,698	18 Jun 2025	Direct
Eric A. Prouty	HDSN	Common Stock	Award	2.2%			3,182	147,821	18 Jun 2025	Direct
Eric A. Prouty	HDSN	Stock Options	Award				13,698	13,698	18 Jun 2025	Direct

* An asterisk sign (*) next to the price indicates that the price is likely invalid.