HDSN · Insider trading · 13F holders · Congress trades
Hudson Technologies Inc (HDSN)
Who is buying and selling HDSN: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 6
- Insider buys, 90 days
- $1.3M
- Insider sales, 90 days
- $0
- Congress trades, 12 months
- 0
HDSN at a glance
- Between Aug 1, 2026 and Oct 29, 2026, 1 HDSN insider filed 6 open-market purchases worth $1.3M on SEC Form 4.
- 6 13F filers hold HDSN among their 50 largest positions, worth $53.5M combined, including Sahm Adrangi. The biggest bets by portfolio weight are Hartree Partners, LP (5.4%), Westerly Capital Management, LLC (3.6%) and Caspian Capital LP (2.4%). In their latest 13Fs, 0 managers opened a new position and 2 added to one.
- No member of Congress has disclosed a trade in HDSN.
- HDSN last closed at $4.42 on Oct 29, 2026.
HDSN insider trading
Between Aug 1, 2026 and Oct 29, 2026, 1 HDSN insider filed 6 open-market purchases worth $1.3M on SEC Form 4.
| Filed | Insider | Role | Trade | Shares | Price | Value | Form 4 |
|---|---|---|---|---|---|---|---|
| Sep 28, 2026 | Hartree Partners, LP | 10% Owner | Buy | 118,549 | $5.10 | $604K | SEC |
| Sep 23, 2026 | Hartree Partners, LP | 10% Owner | Buy | 13,515 | $5.10 | $69K | SEC |
| Sep 18, 2026 | Hartree Partners, LP | 10% Owner | Buy | 11,136 | $5.10 | $57K | SEC |
| Sep 4, 2026 | Hartree Partners, LP | 10% Owner | Buy | 5,317 | $5.10 | $27K | SEC |
| Aug 26, 2026 | Hartree Partners, LP | 10% Owner | Buy | 100,612 | $5.50 | $553K | SEC |
| Aug 14, 2026 | Hartree Partners, LP | 10% Owner | Buy | 5,198 | $5.50 | $29K | SEC |
Who owns HDSN? Hedge funds and superinvestors
6 13F filers hold HDSN among their 50 largest positions, worth $53.5M combined, including Sahm Adrangi. The biggest bets by portfolio weight are Hartree Partners, LP (5.4%), Westerly Capital Management, LLC (3.6%) and Caspian Capital LP (2.4%). In their latest 13Fs, 0 managers opened a new position and 2 added to one.
Superinvestors holding HDSN: Sahm Adrangi 0.4%
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| Hartree Partners, LPHedge fund | 5.4% | $25.3M | 4,411,889 | +16.1% shares | Q2 2026 |
| Westerly Capital Management, LLCHedge fund | 3.6% | $19.4M | 3,380,000 | +6.5% shares | Q2 2026 |
| Caspian Capital LPHedge fund | 2.4% | $4.2M | 728,306 | +0.0% shares | Q2 2026 |
| Jb Capital Partners LPHedge fund | 0.3% | $1.8M | 306,200 | +0.0% shares | Q2 2026 |
| Sahm AdrangiHedge fund | 0.4% | $1.7M | 299,976 | — | Q2 2026 |
| Kestrel Investment Management CorpInstitutional asset manager | 0.6% | $1.2M | 200,750 | +0.0% shares | Q2 2026 |
Each manager counts with its latest 13F (Q2 2026: 6). Screen HDSN in the grand portfolio →
HDSN stock trades by members of Congress
No member of Congress has disclosed a trade in HDSN.
Analysis mentioning HDSN
Posts from the blog that cover Hudson Technologies Inc, newest first.
HDSN questions and answers
Are insiders buying HDSN stock?
Between Aug 1, 2026 and Oct 29, 2026, 1 HDSN insider filed 6 open-market purchases worth $1.3M on SEC Form 4.
Which hedge funds own HDSN?
6 13F filers hold HDSN among their 50 largest positions, worth $53.5M combined, including Sahm Adrangi. The biggest bets by portfolio weight are Hartree Partners, LP (5.4%), Westerly Capital Management, LLC (3.6%) and Caspian Capital LP (2.4%). In their latest 13Fs, 0 managers opened a new position and 2 added to one.
Has Congress traded HDSN?
No member of Congress has disclosed a trade in HDSN.
Who is the largest holder of HDSN?
Among 13F filers, Hartree Partners, LP reports the largest HDSN position, $25.3M (4,411,889 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is Hartree Partners, LP's: 5.4% of its portfolio.
Cite or share this
Free to use with a link back. The data updates every filing day.