HDSN insider buying and SEC filings, explained
Hudson Technologies Inc. · CIK 925528
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Insider activity in the last 12 months
Bought
$8.0M
Insiders who bought
8
Sold (not marked 10b5-1)
$3.6M
Planned sales (10b5-1)
$0
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Oct 29–Nov 2, 2026 | Purchase (code P) | Hartree Partners, LP (10% owner) bought 300,000 shares between Oct 29 and Nov 2 at about $4.38 ($1.3M), reported as a purchase (code P). Holdings up 6% to 5,648,517 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 2, 2026, 4:37 PM ET |
| Sep 24, 2026 | Purchase (code P) | Hartree Partners, LP (10% owner) bought 118,549 shares at about $5.10 ($605K), reported as a purchase (code P). Holdings up 2% to 5,348,517 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Sep 28, 2026 |
| Sep 21–23, 2026 | Purchase (code P) | Hartree Partners, LP (10% owner) bought 13,515 shares between Sep 21 and Sep 23 at about $5.10 ($69K), reported as a purchase (code P). Holdings up <1% to 5,229,968 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Sep 23, 2026 |
| Sep 16, 2026 | Purchase (code P) | Hartree Partners, LP (10% owner) bought 11,136 shares at $5.10 ($57K), reported as a purchase (code P). Holdings up <1% to 5,216,453 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Sep 18, 2026 |
| Sep 2, 2026 | Purchase (code P) | Hartree Partners, LP (10% owner) bought 5,317 shares at $5.10 ($27K), reported as a purchase (code P). Holdings up <1% to 5,205,317 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Sep 4, 2026 |
| Aug 24–25, 2026 | Purchase (code P) | Hartree Partners, LP (10% owner) bought 100,612 shares between Aug 24 and Aug 25 at about $5.50 ($553K), reported as a purchase (code P). Holdings up 2% to 5,200,000 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Aug 26, 2026 |
| Aug 12, 2026 | Purchase (code P) | Hartree Partners, LP (10% owner) bought 5,198 shares at $5.50 ($29K), reported as a purchase (code P). Holdings up <1% to 5,099,388 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Aug 14, 2026 |
| Jul 29, 2026 | Purchase (code P) | Hartree Partners, LP (10% owner) bought 52,104 shares at $5.99 ($312K), reported as a purchase (code P). Holdings up 1% to 5,094,190 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jul 31, 2026 |
| Jul 20–21, 2026 | Purchase (code P) | Hartree Partners, LP (10% owner) bought 65,550 shares between Jul 20 and Jul 21 at about $5.99 ($393K), reported as a purchase (code P). Holdings up 1% to 5,042,086 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jul 22, 2026 |
| Jul 6–7, 2026 | Purchase (code P) | Hartree Partners, LP (10% owner) bought 5,234 shares between Jul 6 and Jul 7 at $5.99 ($31K), reported as a purchase (code P). Holdings up <1% to 4,976,536 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jul 8, 2026 |
| Jun 30–Jul 2, 2026 | Purchase (code P) | Hartree Partners, LP (10% owner) bought 764,202 shares between Jun 30 and Jul 2 at about $5.86 ($4.5M), reported as a purchase (code P). Holdings up 18% to 4,971,302 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Jul 2, 2026 |
| May 19, 2026 | Purchase (code P) | Brian J. Bertaux (CFO) bought 2,000 shares at $4.87 ($10K), reported as a purchase (code P). New position of 2,000 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 21, 2026 |
| May 13, 2026 | Purchase (code P) Amended filing | Richard Parrillo (Director) bought 10,000 shares at $4.83 ($48K), reported as a purchase (code P). Holdings up 5% to 195,746 shares. Not marked as a 10b5-1 plan trade. This amends an earlier filing that is not in our records. | SEC filing Filed May 21, 2026 |
| May 14, 2026 | Purchase (code P) | Loan Nguyen Mansy (Director) bought 5,000 shares at about $4.96 ($25K), reported as a purchase (code P). Holdings up 24% to 25,595 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 15, 2026 |
| May 14, 2026 | Purchase (code P) | Richard Parrillo (Director) bought 5,000 shares at about $4.96 ($25K), reported as a purchase (code P). Holdings up 24% to 25,595 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 15, 2026 |
| May 14, 2026 | Purchase (code P) | Nicole E Bulgarino (Director) bought 550 shares at $4.85 ($3K), reported as a purchase (code P). Holdings up 5% to 11,048 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 15, 2026 |
| May 14, 2026 | Purchase (code P) | Jeffrey R Feeler (Director) bought 5,100 shares at $4.92 ($25K), reported as a purchase (code P). Holdings up 125% to 9,165 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 15, 2026 |
| May 13, 2026 | Purchase (code P) | Eric A Prouty (Director) bought 5,000 shares at $4.84 ($24K), reported as a purchase (code P). Holdings up 3% to 153,852 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 15, 2026 |
| May 13, 2026 | Purchase (code P) | Alan Sheriff (Director) bought 5,200 shares at $4.88 ($25K), reported as a purchase (code P). Holdings up 128% to 9,265 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 15, 2026 |
| May 13, 2026 | Purchase (code P) | Kenneth Gaglione (CEO and Director) bought 5,000 shares indirectly (by trust) at $4.90 ($25K), reported as a purchase (code P). New position of 5,000 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed May 15, 2026 |
| Dec 5, 2025 | Sale Amended filing | Brian F. Coleman (Former Director) sold 484,616 shares at $7.40 ($3.6M). Holdings down 53% to 426,968 shares. Not marked as a 10b5-1 plan trade. This amends a filing from Dec 9, 2025. | SEC filing Filed Dec 15, 2025 |
| Nov 17, 2025 | Purchase (code P) | Vincent P. Abbatecola (Director) bought 3,500 shares at $6.79 ($24K), reported as a purchase (code P). Holdings up 2% to 169,748 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Nov 18, 2025 |
10 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
6 insiders bought in 30 days
$149K in purchases since May 13, 2026 · Purchases traded May 13, 2026 to May 14, 2026 · Closed
| Insider | Value | Traded | Source |
|---|---|---|---|
| Kenneth Gaglione (CEO) | $25K | May 13, 2026 | SEC filing |
| Alan Sheriff (Director) | $25K | May 13, 2026 | SEC filing |
| Eric A Prouty (Director) | $24K | May 13, 2026 | SEC filing |
| Jeffrey R Feeler (Director) | $25K | May 14, 2026 | SEC filing |
| Richard Parrillo (Director) | $25K | May 14, 2026 | SEC filing |
| Loan Nguyen Mansy (Director) | $25K | May 14, 2026 | SEC filing |
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
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