Security key
444144109
HUDSON TECHNOLOGIES INC /NY - Common Stock (HDSN)
CUSIP: 444144109
Q4 2025 13F Holders as of 31 Dec 2025
- Security type / class
- Equity / Common Stock
- Total 13F shares
- 32,978,611
- Total 13F value
- $226,419,148
- Share change
- -846,835
- SEC-reported price per share
- $6.85
- Number of holders
- 167
- Value change
- -$7,830,042
- Number of buys
- 66
- Number of sells
- 94
- Shares outstanding
- 41,870,511
Holder snapshot
6 signals
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q4 2025
Institutions
167
Top holders
10
HDSN full security history
Ownership snapshot
Full 13F holder table
HUDSON TECHNOLOGIES INC /NY SEC filings
HUDSON TECHNOLOGIES INC /NY company facts
Broader feeds
Ownership snapshot
Top reported holders of HDSN - HUDSON TECHNOLOGIES INC /NY - Common Stock (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
WESTERLY CAPITAL MANAGEME...
Disclosed value leader
Hartree Partners, LP
Comparable rows
15/15
Latest evidence
17 Nov 2025
13F
13D/G
3/4/5
Lead comparable stake: 5.9%
13D/G row: WESTERLY CAPITAL MANAGEMENT, LLC
Showing 1-6 of 15 holder rows.
Quick read
WESTERLY CAPITAL MANAGEMENT, LLC leads the comparable SEC ownership view at 5.9%.
15 of 15 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 WESTERLY CAPITAL MANAGEMENT, LLC's linked filing trail.
Comparable ownership
Top 5
WESTERLY CAPITAL MANAGEMENT, LLC
5.9%
Vincent P. Abbatecola
0.41%
Hartree Partners, LP
9.1%
BlackRock, Inc.
6.8%
VANGUARD GROUP INC
5.7%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| WESTERLY CAPITAL MANAGEMENT, LLC |
13F
13D/G
Company
|
5.9%
from 13D/G
|
$18,767,700
1,890,000 shares
|
— | 30 Sep 2025 |
| Vincent P. Abbatecola |
3/4/5
Director
|
0.41%
|
$1,151,740
169,748 shares
|
+$23,748 | 17 Nov 2025 |
| Hartree Partners, LP |
13F
Company
|
9.1%
|
$37,734,000
3,800,000 shares
|
— | 30 Sep 2025 |
| BlackRock, Inc. |
13F
Company
|
6.8%
|
$28,432,300
2,863,273 shares
|
— | 30 Sep 2025 |
| VANGUARD GROUP INC |
13F
Company
|
5.7%
|
$23,565,687
2,373,181 shares
|
— | 30 Sep 2025 |
| DIMENSIONAL FUND ADVISORS LP |
13F
Company
|
4.8%
|
$19,952,826
2,009,481 shares
|
— | 30 Sep 2025 |
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.
13F holder rows
Institutional holders as of Q4 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
167
Shares
32,978,611
Rows available
167
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q4 2025 vs Q3 2025 Across Filers
Q3 2025 holders
169
Q4 2025 holders
167
Holder diff
-2
| Investor | Q3 2025 Shares | Q4 2025 Shares | Share Diff | Share Chg % | Q3 2025 value | Q4 2025 value | Value change | Value Chg % |
|---|