Hudson Technologies HDSN Insider Ownership

NASDAQ HDSN

$4.40 -0.03 (-0.68%)

At close: Nov 13, 2026 · 4:00 PM EST

Insider Holdings by Owner

7.17Mn Shares

Partners, Lp Hartree5.65Mn78.7%

Brian F Coleman426.97K6.0%

Stephen P Mandracchia396.76K5.5%

Vincent P Abbatecola169.75K2.4%

Kathleen Houghton158.62K2.2%

Other insiders (10)373.85K5.2%

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

15.21%

▲+0.896% pp QoQ

Shares Held by Insiders

6.40Mn

filed for Sep 2026

▲+6.26% QoQ

Shares Outstanding

42.09Mn

42,088,547 shares

Direct Holdings

6.40Mn

Indirect: 5.00K

Net Open-Market Trades

+936.63K

net bought · $5.39Mn in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Open-Market Insider Trades

Bought Sold

Latest quarter —

Net over range —

Net-buying quarters —

Insider Ownership Summary

Updated Nov 4, 2026

Across the past 12 months, open-market trades by Hudson Technologies insiders totaled $8.07 million in purchases (1.48Mn shares) and $3.59 million in sales (484.62K shares).

By number of insiders, Hudson Technologies saw 9 insiders buy and one insider sell on the open market over the past 12 months.
Among HDSN's insiders, Hartree Partners, LP (10% owner) was the top open-market buyer in the past 12 months, with $7.87 million of stock purchased (1.44Mn shares) and the latest purchase on November 2, 2026.
On the selling side, Brian F. Coleman (Director) was the top open-market seller of Hudson Technologies over the past 12 months, with $3.59 million sold (484.62K shares) and the latest sale on December 5, 2025.
In transactions other than open-market trades, Hudson Technologies insiders received 20.61K shares in stock awards, acquired 218.51K shares through option exercises and conversions and gave up 101.05K shares to cover taxes or exercise prices over the past 12 months.
Business Quant data shows Hudson Technologies insiders holding 6.7Mn shares in total in their latest Form 4 filings, up 11.24% from 6.03Mn shares at the end of Q2 2026.
Direct holdings account for 6.7Mn shares (99.93%) of HDSN's insider total, and indirect holdings through trusts, partnerships and family members for 5K shares (0.07%).
Per Business Quant, 12 insiders of HDSN hold shares, counting officers, directors and 10% owners who have filed a Form 4 in the past two years.
Hudson Technologies' three largest insider shareholders, based on their latest Form 4 filings, are Hartree Partners, LP (10% owner, 5.65Mn shares), Brian F. Coleman (426.97K shares) and Vincent P. Abbatecola (Director, 169.75K shares).
Hartree Partners, LP holds 84.27% of the combined insider position in Hudson Technologies.
Institutions held 75.09% of Hudson Technologies' outstanding shares in their Q2 2026 13F filings, insiders about 15.93% based on their latest Form 4 filings, and other investors, including the public, the remaining 8.98%.
Over the trailing 12 months, 12 insiders reported transactions in HDSN stock across 33 Form 4 filings.
The insider data for HDSN reflects Form 4 filings through November 2, 2026.

Form 4 Holdings

Insiders Holding HDSN

Insiders 15

Shares held 7.17Mn

Of outstanding 17.05%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	Partners, Lp Hartree	TenPercentOwner	5,648,517	0	5,648,517	78.7%	02 Nov, 2026
2	Brian F Coleman	President, Ceo	426,968	0	426,968	6.0%	15 Dec, 2025
3	Stephen P Mandracchia	Director	0	396,756	396,756	5.5%	09 Jan, 2023
4	Vincent P Abbatecola	Director	169,748	0	169,748	2.4%	18 Nov, 2025
5	Kathleen Houghton	Sr. Vp Sales And Marketing	158,618	0	158,618	2.2%	12 Jan, 2026
6	Eric A Prouty	Director	158,292	0	158,292	2.2%	22 Jun, 2026
7	Otto C Morch	Director	87,366	0	87,366	1.2%	06 Jul, 2022
8	Loan Nguyen Mansy	Director	34,476	0	34,476	0.5%	22 Jun, 2026
9	Richard Parrillo	Director	25,595	0	25,595	0.4%	15 May, 2026
10	Nat Krishnamurti	Cfo	25,207	0	25,207	0.4%	10 Nov, 2022
11	Alan Sheriff	Director	12,484	0	12,484	0.2%	22 Jun, 2026
12	Jeffrey R Feeler	Director	12,384	0	12,384	0.2%	22 Jun, 2026
13	Nicole E Bulgarino	Director	11,048	0	11,048	0.2%	15 May, 2026
14	Kenneth Gaglione	President And Ceo	0	5,000	5,000	0.1%	15 May, 2026
15	Brian J. Bertaux	Chief Financial Officer	2,000	0	2,000	0.0%	21 May, 2026

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

1,023 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
29 Oct, 2026	Partners, Lp Hartree	TenPercentOwner	Acquired P	200,000	$4.44	$888.60K	5,548,517	Direct
30 Oct, 2026	Partners, Lp Hartree	TenPercentOwner	Acquired P	58,710	$4.25	$249.51K	5,607,227	Direct
02 Nov, 2026	Partners, Lp Hartree	TenPercentOwner	Acquired P	41,290	$4.25	$175.48K	5,648,517	Direct
24 Sep, 2026	Partners, Lp Hartree	TenPercentOwner	Acquired P	118,549	$5.10	$604.45K	5,348,517	Direct
21 Sep, 2026	Partners, Lp Hartree	TenPercentOwner	Acquired P	2,502	$5.10	$12.76K	5,218,955	Direct
23 Sep, 2026	Partners, Lp Hartree	TenPercentOwner	Acquired P	11,013	$5.10	$56.17K	5,229,968	Direct
16 Sep, 2026	Partners, Lp Hartree	TenPercentOwner	Acquired P	11,136	$5.10	$56.79K	5,216,453	Direct
02 Sep, 2026	Partners, Lp Hartree	TenPercentOwner	Acquired P	5,317	$5.10	$27.12K	5,205,317	Direct
24 Aug, 2026	Partners, Lp Hartree	TenPercentOwner	Acquired P	9,446	$5.50	$51.95K	5,108,834	Direct
25 Aug, 2026	Partners, Lp Hartree	TenPercentOwner	Acquired P	91,166	$5.50	$501.09K	5,200,000	Direct
12 Aug, 2026	Partners, Lp Hartree	TenPercentOwner	Acquired P	5,198	$5.50	$28.59K	5,099,388	Direct
29 Jul, 2026	Partners, Lp Hartree	TenPercentOwner	Acquired P	52,104	$5.99	$312.10K	5,094,190	Direct
20 Jul, 2026	Partners, Lp Hartree	TenPercentOwner	Acquired P	17,842	$5.99	$106.86K	4,994,378	Direct
21 Jul, 2026	Partners, Lp Hartree	TenPercentOwner	Acquired P	47,708	$5.99	$285.74K	5,042,086	Direct
06 Jul, 2026	Partners, Lp Hartree	TenPercentOwner	Acquired P	4,634	$5.99	$27.76K	4,975,936	Direct
07 Jul, 2026	Partners, Lp Hartree	TenPercentOwner	Acquired P	600	$5.99	$3.59K	4,976,536	Direct
30 Jun, 2026	Partners, Lp Hartree	TenPercentOwner	Acquired P	204,789	$5.68	$1.16Mn	4,411,889	Direct
01 Jul, 2026	Partners, Lp Hartree	TenPercentOwner	Acquired P	288,111	$5.88	$1.70Mn	4,700,000	Direct
02 Jul, 2026	Partners, Lp Hartree	TenPercentOwner	Acquired P	271,302	$5.97	$1.62Mn	4,971,302	Direct
17 Jun, 2026	Alan Sheriff	Director	Acquired A	3,219	$0.00	$0	12,484	Direct

Showing 1 to 20 of 1,023 transactions