Comparable stake leader
Hartree Partners, LP
SEC ownership of HUDSON TECHNOLOGIES INC /NY
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0000925528.
Disclosed value leader
Hartree Partners, LP
Comparable rows
50/50
Latest evidence
29 Jul 2026
- Public ticker
- HDSN on Nasdaq
- Parsed ownership sources
-
3/4/5, 13D/G, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Hartree Partners, LP
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Hartree Partners, LP
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
29 Jul 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0000925528
- Issuer location
- Pearl River, NY
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of HUDSON TECHNOLOGIES INC /NY (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Hartree Partners, LP
Disclosed value leader
Hartree Partners, LP
Comparable rows
50/50
Latest evidence
29 Jul 2026
3/4/5
13D/G
13F
Lead comparable stake: 12%
13D/G row: Hartree Partners, LP
Showing 1-8 of 50 holder rows.
Quick read
Hartree Partners, LP leads the comparable SEC ownership view at 12%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Hartree Partners, LP's linked filing trail.
Comparable ownership
Top 5
Hartree Partners, LP
12%
WESTERLY CAPITAL MANAGEMENT, LLC
5.9%
DIMENSIONAL FUND ADVISORS LP
4.7%
Vincent P. Abbatecola
0.41%
Kathleen Houghton
0.38%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Hartree Partners, LP |
3/4/5
13D/G
13F
10%+ Owner · Company
|
12%
from 13D/G
|
$30,514,198
5,094,190 shares
|
+$5,213,263 | 29 Jul 2026 |
| WESTERLY CAPITAL MANAGEMENT, LLC |
13F
13D/G
Company
|
5.9%
from 13D/G
|
$18,669,000
3,175,000 shares
|
— | 31 Mar 2026 |
| DIMENSIONAL FUND ADVISORS LP |
13F
13D/G
Company
|
4.7%
from 13D/G
|
$12,631,109
2,148,311 shares
|
— | 31 Mar 2026 |
| Vincent P. Abbatecola |
3/4/5
Director
|
0.41%
|
$1,151,740
169,748 shares
|
+$23,748 | 17 Nov 2025 |
| Kathleen Houghton |
3/4/5
Sr. VP-Sales and Marketing, Director
|
0.38%
|
$1,126,187
158,618 shares
|
— | 08 Jan 2026 |
| Robert Stoody |
3/4/5
Senior VP - Operations
|
0.17%
|
$479,821
70,047 shares
|
— | 30 Jan 2026 |
| BlackRock, Inc. |
13F
Company
|
6.8%
|
$16,831,729
2,862,539 shares
|
— | 31 Mar 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
4%
|
$9,761,658
1,660,146 shares
|
— | 31 Mar 2026 |
How to read this table
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.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to buying over the last 12 months. Net value: +$1,858,321.
Buys
$5,446,418
Insiders: 10
Sells
$3,588,097
Insiders: 1
Net
+$1,858,321
Shares: +448,824
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 933,440
Shares: 484,616
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 929,940 | 0 | $5,422,670 | $0 | +$5,422,670 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 3,500 | 484,616 | $23,748 | $3,588,097 | -$3,564,349 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-18 of 18 reporting-owner rows connected to HUDSON TECHNOLOGIES INC /NY. Open a relationship link for the CIK-to-CIK filing trail.
Rows
18
Largest Forms 3/4/5 holder
Hartree Partners, LP
Net 12M change
+$1,858,321
Latest report
29 Jul 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Hartree Partners, LP | 10%+ Owner | $30,514,198 | +$5,213,263 | +21% | Filing P/S | 29 Jul 2026 |
| 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 | $930,756 | +$24,200 | +2.7% | Mixed | 17 Jun 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 |
| Loan Nguyen Mansy | Director | $202,718 | +$24,814 | +14% | Mixed | 17 Jun 2026 |
| Richard Parrillo | Director | $127,207 | +$73,071 | +135% | Filing P/S | 17 Jun 2026 |
| Richard Damian Caruso | Director | $87,092 | Mixed | 01 Jul 2021 | ||
| Alan Sheriff | Director | $73,405 | +$25,350 | +53% | Mixed | 17 Jun 2026 |
| Jeffrey R. Feeler | Director | $72,817 | +$25,092 | +53% | Mixed | 17 Jun 2026 |
| Nicole E. Bulgarino | Director | $53,527 | +$2,665 | +5.2% | Filing P/S | 17 Jun 2026 |
| Brian J. Bertaux | Chief Financial Officer | $9,740 | +$9,740 | +100% | Filing P/S | 19 May 2026 |
| Nat Krishnamurti | Cfo | Mixed | 27 Feb 2024 | |||
| Stephen P. Mandracchia | Director | Mixed | 14 Jun 2023 |
Recent insider transactions for HUDSON TECHNOLOGIES INC /NY
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Hartree Partners, LP | HDSN | Common Stock, par value $0.01 | Purchase | 1.03% | $312,103 | $5.99 | 52,104 | 5,094,190 | 29 Jul 2026 | Direct |
| Hartree Partners, LP | HDSN | Common Stock, par value $0.01 | Purchase | 0.96% | $285,742 | $5.99 | 47,708 | 5,042,086 | 21 Jul 2026 | Direct |
| Hartree Partners, LP | HDSN | Common Stock, par value $0.01 | Purchase | 0.36% | $106,859 | $5.99 | 17,842 | 4,994,378 | 20 Jul 2026 | Direct |
| Hartree Partners, LP | HDSN | Common Stock, par value $0.01 | Purchase | 0.01% | $3,594 | $5.99 | 600 | 4,976,536 | 07 Jul 2026 | Direct |
| Hartree Partners, LP | HDSN | Common Stock, par value $0.01 | Purchase | 0.09% | $27,758 | $5.99 | 4,634 | 4,975,936 | 06 Jul 2026 | Direct |
| Hartree Partners, LP | HDSN | Common Stock, par value $0.01 | Purchase | 5.77% | $1,619,212 | $5.97 | 271,302 | 4,971,302 | 02 Jul 2026 | Direct |
| Hartree Partners, LP | HDSN | Common Stock, par value $0.01 | Purchase | 6.53% | $1,695,101 | $5.88 | 288,111 | 4,700,000 | 01 Jul 2026 | Direct |
| Hartree Partners, LP | HDSN | Common Stock, par value $0.01 | Purchase | 4.87% | $1,162,894 | $5.68 | 204,789 | 4,411,889 | 30 Jun 2026 | Direct |
| Alan Sheriff | HDSN | Common Stock | Award | 34.7% | 3,219 | 12,484 | 17 Jun 2026 | Direct | ||
| Alan Sheriff | HDSN | Stock Options | Award | 15,360 | 15,360 | 17 Jun 2026 | Direct | |||
| Eric A. Prouty | HDSN | Common Stock | Award | 2.89% | 4,440 | 158,292 | 17 Jun 2026 | Direct | ||
| Eric A. Prouty | HDSN | Stock Options | Award | 21,186 | 21,186 | 17 Jun 2026 | Direct | |||
| Richard Parrillo | HDSN | Stock Options | Award | 31,780 | 31,780 | 17 Jun 2026 | Direct | |||
| Loan Nguyen Mansy | HDSN | Common Stock | Award | 34.7% | 8,881 | 34,476 | 17 Jun 2026 | Direct | ||
| Loan Nguyen Mansy | HDSN | Stock Options | Award | 21,186 | 21,186 | 17 Jun 2026 | Direct | |||
| Nicole E. Bulgarino | HDSN | Stock Options | Award | 31,780 | 31,780 | 17 Jun 2026 | Direct | |||
| Jeffrey R. Feeler | HDSN | Common Stock | Award | 35.1% | 3,219 | 12,384 | 17 Jun 2026 | Direct | ||
| Jeffrey R. Feeler | HDSN | Stock Options | Award | 15,360 | 15,360 | 17 Jun 2026 | Direct | |||
| 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 |
* marks a reported price that did not pass the local price check.