Every Form 4 that Hudson Technologies Inc (HDSN) has filed with the SEC in the last 12 months is listed below, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A Form 4 covers the transactions officers, directors and large holders report, so if you follow HDSN and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full HDSN filings page.
HUDSON TECHNOLOGIES INC /NY (HDSN) had a Form 4 filed for Hartree Partners, LP, a ten percent owner, reporting an open-market purchase of 5,317 shares of common stock on September 2, 2026, at $5.10 per share. Following this transaction, the reporting party is shown holding 5,205,317 shares, with beneficial ownership disclaimed except to the extent of its pecuniary interest.
HUDSON TECHNOLOGIES INC /NY (HDSN) reported that Hartree Partners, LP, a more-than-10% owner, purchased a total of 100,612 shares of common stock in open-market transactions. On 2026-08-25, Hartree bought 91,166 shares at a weighted average price of $5.4965 per share, with individual trades between $5.48 and $5.50. On 2026-08-24, it bought an additional 9,446 shares at $5.50 per share. The reporting person disclaims beneficial ownership beyond its pecuniary interest, and the trades were not reported as made under a Rule 10b5-1 trading plan.
Hartree Partners, LP, a 10% owner of Hudson Technologies Inc. (HDSN), reported an open-market purchase of 5,198 shares of common stock on 2026-08-12 at $5.50 per share. Following this transaction, Hartree Partners, LP reported holding 5,099,388 shares of Hudson Technologies common stock. Hartree Partners, LP disclaims beneficial ownership of these securities except to the extent of its pecuniary interest.
Hartree Partners, LP, a 10% owner of Hudson Technologies, reported purchasing 52,104 shares of Common Stock on 2026-07-29 at $5.99 per share. Following this open-market or private transaction, its direct holdings increased to 5,094,190 shares, subject to a pecuniary-interest beneficial ownership disclaimer.
Hartree Partners, LP, a ten percent owner of Hudson Technologies, reported purchases totaling 65,550 shares of common stock on July 20-21, 2026. It bought 17,842 shares at a weighted average price of $5.9892 and 47,708 shares at $5.9894 per share, with individual trades between $5.9850 and $5.9900. Hartree disclaims beneficial ownership beyond its pecuniary interest, and the trades were not indicated as made under a Rule 10b5-1 trading plan.
Hartree Partners, LP, a 10% owner of HUDSON TECHNOLOGIES INC /NY, reported open-market purchases of common stock. It bought 4,634 shares on July 6, 2026 and 600 shares on July 7, 2026, both at $5.99 per share, for a total of 5,234 shares. After these trades, Hartree Partners directly held 4,976,536 shares. The filer disclaims beneficial ownership beyond its pecuniary interest in these securities.
Hartree Partners, LP, a more than ten percent owner of Hudson Technologies Inc., reported a series of open-market purchases of the company’s common stock. Over June 30 to July 2, 2026, Hartree bought a total of 764,202 shares at weighted average prices between roughly $5.68 and $5.97 per share. After these transactions, Hartree directly holds 4,971,302 shares of Hudson Technologies common stock. The filing notes that prices are reported as weighted averages across multiple trades within stated ranges and that Hartree disclaims beneficial ownership beyond its pecuniary interest.
HUDSON TECHNOLOGIES INC /NY director Alan Sheriff reported equity awards in the form of common stock and stock options. He received 3,219 shares of Common Stock as a grant at no cash cost, increasing his direct holdings to 12,484 common shares after the award.
He was also granted 15,360 Stock Options exercisable for an equal number of common shares at a strike price of $5.63 per share, with an expiration date on June 17, 2029. These awards are compensation-related acquisitions, not open‑market purchases or sales.
Prouty Eric A reported acquisition or exercise transactions in this Form 4 filing.
HUDSON TECHNOLOGIES INC /NY director Eric A. Prouty received equity compensation. On June 17, 2026, he was granted 4,440 shares of Common Stock at no cost and 21,186 stock options exercisable at $5.63 per share, expiring on June 17, 2029. After these awards, he directly holds 158,292 Common shares and 21,186 options.
HUDSON TECHNOLOGIES INC /NY director Richard Parrillo received a grant of stock options covering 31,780 shares of common stock. The options were awarded at an exercise price of $5.63 per share, have no cost at grant, and are scheduled to expire on June 17, 2029. Following this compensation-related award, he holds 31,780 derivative securities directly in the form of these options.
HUDSON TECHNOLOGIES INC /NY director Mansy Loan Nguyen received new equity compensation. On 2026-06-17, Nguyen was granted 8,881 shares of common stock at no cost and 21,186 stock options to buy common shares at $5.63 per share, expiring on 2029-06-17.
Following the award, Nguyen directly holds 34,476 common shares and 21,186 stock options, all shown as acquisitions rather than market purchases or sales.
HUDSON TECHNOLOGIES INC /NY director receives new stock options. Director Nicole E. Bulgarino was granted stock options covering 31,780 shares of common stock on June 17, 2026. The options have an exercise price of $5.63 per share and expire on June 17, 2029. This is a compensation-related grant, not an open-market trade.
HUDSON TECHNOLOGIES INC /NY director Jeffrey R. Feeler received new equity compensation. On June 17, 2026, he was granted 3,219 shares of common stock at no cost, increasing his direct common stock holdings to 12,384 shares.
He was also granted stock options for 15,360 shares of common stock at an exercise price of $5.63 per share, expiring on June 17, 2029. Following this grant, he holds 15,360 stock options directly.
Hudson Technologies director Richard Parrillo reported an open-market purchase of the company’s Common Stock. On May 13, 2026, he bought 10,000 shares at an average price of $4.8257 per share. After this transaction, he directly owns 195,746 shares of Hudson Technologies common stock.
HUDSON TECHNOLOGIES INC /NY Chief Financial Officer buys shares on the open market. On 2026-05-19, CFO Brian J. Bertaux purchased 2,000 shares of the company’s Common Stock in an open-market transaction at an average price of $4.87 per share. Following this purchase, he directly owns 2,000 shares.
HUDSON TECHNOLOGIES INC /NY director Mansy Loan Nguyen reported buying 5,000 shares of HDSN common stock in open-market transactions. The purchases occurred on May 14, 2026 at prices of about $4.96–$4.97 per share, reflecting additional direct ownership in the company.
Hudson Technologies director Richard Parrillo reported open-market purchases of the company’s Common Stock. On May 14, 2026, he bought a total of 5,000 shares in two trades at prices of $4.97 and $4.96 per share.
HUDSON TECHNOLOGIES INC /NY director Nicole E. Bulgarino bought shares of the company in the open market. On May 14, 2026, she made an open-market purchase of 550 shares of Common Stock at a price of $4.845 per share.
After this transaction, her direct ownership increased to 11,048 shares. This filing records a single insider buy with no derivative securities reported as part of this transaction.
Hudson Technologies director Eric A. Prouty reported an open-market purchase of company stock. On May 13, 2026, he bought 5,000 shares of Hudson Technologies common stock at an average price of $4.84 per share. Following this transaction, he directly holds 153,852 common shares.
HUDSON TECHNOLOGIES INC /NY director Alan Sheriff made an open-market purchase of company stock. He bought 5,200 shares of Common Stock at a price of $4.875 per share.
After this transaction, he directly owns a total of 9,265 shares of Hudson Technologies common stock.
HUDSON TECHNOLOGIES INC director Jeffrey R. Feeler reported an open-market purchase of company stock. On May 14, 2026, he bought 5,100 shares of common stock at $4.92 per share. After this transaction, Feeler directly owns 9,165 common shares of Hudson Technologies.
HUDSON TECHNOLOGIES INC /NY President and CEO Kenneth Gaglione reported an indirect open-market purchase of 5,000 shares of common stock at $4.895 per share by The Gaglione Trust. After this transaction, the trust holds 5,000 shares indirectly and Gaglione holds 37,504 shares directly.
Sheriff Alan reported acquisition or exercise transactions in this Form 4 filing.
HUDSON TECHNOLOGIES INC /NY director receives stock grant
Director Alan Sheriff was granted 4,065 shares of Hudson Technologies common stock. The grant carried a price of $0.00 per share, indicating it is a compensation-related award rather than a market purchase. After this grant, he directly holds 4,065 shares.
Feeler Jeffrey R reported acquisition or exercise transactions in this Form 4 filing.
HUDSON TECHNOLOGIES INC /NY director Jeffrey R. Feeler received a grant of 4,065 shares of Common Stock. The award was recorded on April 10, 2026 at a stated price of $0.00 per share, indicating it was compensation rather than a market purchase.
Following this grant, Feeler directly holds 4,065 shares of Hudson Technologies common stock as reported in this filing.
Hudson Technologies Inc. insider activity: Director and Sr. VP–Sales and Marketing Kathleen Houghton reported multiple equity transactions dated January 8, 2026. She exercised stock options for 120,000 shares of common stock at $0.75 per share, 47,619 shares at $1.60 per share, and 50,888 shares at $3.81 per share. The filing also shows related dispositions of common stock using transaction code "F" totaling 44,873, 21,797, and 34,382 shares at a price of $7.10 per share. After these transactions, Houghton directly beneficially owned 158,618 shares of Hudson Technologies common stock.
Hudson Technologies Inc. insider activity was updated through an amended ownership report. The filing reflects a December 5, 2025 sale of 484,616 shares of common stock at $7.404 per share. After this transaction, the reporting person now states they directly beneficially own 426,968 shares.
The amendment explains that the post-transaction ownership had previously been reported as 1,944,312 shares and is being corrected to 426,968 shares. No new transactions are disclosed; the change is limited to fixing the reported share balance following the December 5 trade.
Hudson Technologies Inc. (HDSN) reported a stock option award to its President and CEO, who also serves as a director. On 11/24/2025, the executive received a stock option for 216,309 shares of common stock at an exercise price of $6.7 per share. The option vests 50% on the first anniversary of the grant date and 50% on the second anniversary, and expires on 11/24/2030. Following this transaction, the option is held as a direct ownership position.
Hudson Technologies Inc. (HDSN) director reports open‑market stock purchase. A company director bought 3,500 shares of Hudson Technologies common stock on 11/17/2025 at a price of $6.785 per share, according to a Form 4 filing. Following this transaction, the reporting person beneficially owns 169,748 shares of Hudson Technologies common stock in direct ownership.
Vincent P. Abbatecola, a director of Hudson Technologies, Inc. (HDSN), reported transactions in the company's common stock on 09/24/2025. He exercised 4,744 stock options at an exercise price of $7.35 (transaction code M) resulting in acquisition of 4,744 shares. He also reported a separately coded disposition of 3,519 shares at $9.91. After these transactions he beneficially owned 166,248 shares.