HDSNNasdaq

HUDSON TECHNOLOGIES INC /NY

Alert me on HDSN

Insider buys, 6 months

Congress trades, 6 months

Signals, 6 months

Six months

After each filing

Nov 3 Buy Hartree Partners, LP Insider

1 week

Result in5 trading days

1 month

Result in21 trading days

3 months

Result in63 trading days

6 months

Result in126 trading days

Sep 29 Buy Hartree Partners, LP Insider

1 week

+3.1%S&P +1.9%

1 month

+1.6%S&P +1.1%

3 months

Result in38 trading days

6 months

Result in101 trading days

Sep 24 Buy Hartree Partners, LP Insider

1 week

+0.4%S&P −0.4%

1 month

+2.7%S&P −0.9%

3 months

Result in35 trading days

6 months

Result in98 trading days

Sep 19 Buy Hartree Partners, LP Insider

1 week

−1.7%S&P −1.0%

1 month

+2.2%S&P −0.6%

3 months

Result in32 trading days

6 months

Result in95 trading days

Sep 5 Buy Hartree Partners, LP Insider

1 week

−2.8%S&P −1.1%

1 month

−3.7%S&P +1.7%

3 months

Result in23 trading days

6 months

Result in86 trading days

Show all 22

Aug 27 Buy Hartree Partners, LP Insider

1 week

−4.2%S&P +0.3%

1 month

−6.9%S&P −0.5%

3 months

Result in16 trading days

6 months

Result in79 trading days

Aug 15 Buy Hartree Partners, LP Insider

1 week

−10.2%S&P −1.2%

1 month

−15.3%S&P −2.4%

3 months

Result in8 trading days

6 months

Result in71 trading days

Aug 1 Buy Hartree Partners, LP Insider

1 week

−8.5%S&P +2.0%

1 month

−17.5%S&P +0.5%

3 months

−30.8%S&P 0.0%

6 months

Result in61 trading days

Jul 23 Buy Hartree Partners, LP Insider

1 week

−8.4%S&P +0.5%

1 month

−11.1%S&P +3.7%

3 months

−14.5%S&P +5.0%

6 months

Result in54 trading days

Jul 9 Buy Hartree Partners, LP Insider

1 week

−1.6%S&P −0.1%

1 month

−12.7%S&P +2.9%

3 months

−19.7%S&P +3.6%

6 months

Result in44 trading days

Jul 3 Buy Hartree Partners, LP Insider

1 week

+3.0%S&P −0.3%

1 month

+5.0%S&P +2.7%

3 months

−13.1%S&P +2.7%

6 months

Result in41 trading days

May 21 Buy Bertaux Brian J. Insider

1 week

+2.9%S&P +1.9%

1 month

+11.4%S&P −1.0%

3 months

+8.9%S&P +3.4%

6 months

Result in12 trading days

May 21 Buy Parrillo Richard Insider

1 week

+2.9%S&P +1.9%

1 month

+11.4%S&P −1.0%

3 months

+8.9%S&P +3.4%

6 months

Result in12 trading days

May 15 Buy Bulgarino Nicole E Insider

1 week

+2.8%S&P +0.9%

1 month

+13.0%S&P +1.5%

3 months

+25.0%S&P +4.8%

6 months

Result in8 trading days

May 15 Buy Sheriff Alan Insider

1 week

+2.8%S&P +0.9%

1 month

+13.0%S&P +1.5%

3 months

+25.0%S&P +4.8%

6 months

Result in8 trading days

May 15 Buy Parrillo Richard Insider

1 week

+2.8%S&P +0.9%

1 month

+13.0%S&P +1.5%

3 months

+25.0%S&P +4.8%

6 months

Result in8 trading days

May 15 Buy Feeler Jeffrey R Insider

1 week

+2.8%S&P +0.9%

1 month

+13.0%S&P +1.5%

3 months

+25.0%S&P +4.8%

6 months

Result in8 trading days

May 15 Buy Mansy Loan Nguyen Insider

1 week

+2.8%S&P +0.9%

1 month

+13.0%S&P +1.5%

3 months

+25.0%S&P +4.8%

6 months

Result in8 trading days

May 15 Buy Gaglione Kenneth Insider

1 week

+2.8%S&P +0.9%

1 month

+13.0%S&P +1.5%

3 months

+25.0%S&P +4.8%

6 months

Result in8 trading days

May 15 Buy Prouty Eric A Insider

1 week

+2.8%S&P +0.9%

1 month

+13.0%S&P +1.5%

3 months

+25.0%S&P +4.8%

6 months

Result in8 trading days

Dec 10, 2025 Sale COLEMAN BRIAN F Insider

1 week

+2.4%S&P −2.4%

1 month

+1.9%S&P +1.4%

3 months

−19.9%S&P −3.4%

6 months

−19.6%S&P +8.5%

Nov 18, 2025 Buy ABBATECOLA VINCENT P Insider

1 week

+0.9%S&P +2.3%

1 month

+8.4%S&P +2.5%

3 months

+9.3%S&P +4.8%

6 months

−23.4%S&P +13.2%

Every purchase and sale on this ticker reported by a member of Congress or an insider, measured from the close of the first trading day after it became public to the close 1 week, 1 month, 3 months and 6 months later, each beside the S&P over the same days.

Filings for HDSN

41 held · newest 541 held · newest 2

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See all 41 filings for HDSN

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Signal history

Nov 2 Insider

Hartree Partners, LP (10% owner) bought $1.3M

Result in 4 trading days

Result in 20 trading days

Result in 62 trading days

Result in 125 trading days

Sep 28 Insider

Hartree Partners, LP (10% owner) bought $730K

A week later+3.1%S&P +1.9%

A month later+1.6%S&P +1.1%

Result in 38 trading days

Result in 101 trading days

Sep 18 Insider

Hartree Partners, LP (10% owner) bought $57K

A week later−1.7%S&P −1.0%

A month later+2.2%S&P −0.6%

Result in 32 trading days

Result in 95 trading days

Stakes

Jun 30, 2026 Schedule 13G, amended

Dimensional Fund Advisors LP: 4.7%, 1,967,914 shares

Jun 30, 2026 Schedule 13G, amended

Hartree Partners, LP: 11.8%, 4,971,302 shares

Jun 5, 2026 Schedule 13G

Hartree Partners, LP: 9%, 3,800,000 shares

Mar 31, 2026 Schedule 13G

Dimensional Fund Advisors LP: 5.1%, 2,148,311 shares

Mar 13, 2026 Schedule 13G, amended

The Vanguard Group: 0%, 0 shares

Dec 31, 2025 Schedule 13G, amended

WESTERLY CAPITAL MANAGEMENT, LLC: 5.9%

Dec 8, 2025 Schedule 13D

Hartree Partners, LP: 8.7%, 3,800,000 shares

Schedule 13D is filed within 5 business days of crossing 5 percent by an investor who may seek to influence the company. Schedule 13G is filed by a passive holder, and a large institution has up to 45 days after the quarter end.

Government contracts, last 12 months

Awards of $10M and up, from USAspending · context, not a signal

No contracts of $10M or more in the last 12 months.

Lobbying

Last four quarters

$140KQ4 2025

$140KQ1 2026

$140KQ2 2026

$60KQ3 2026

Down 57 percent from Q2 2026. Reported to the Senate each quarter by the firms it hires.Original report ↗

Read from LDA.gov between Sep 23, 2026 and Oct 21, 2026. Senate Office of Public Records cannot vouch for the data or analyses derived from these data after the data have been retrieved from LDA.gov.