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$HDSN
$5.25 -$0.02 (0.29%) Live

Ownership

13F as of Q2 2026 · 42.1M shares outstanding

Who owns HDSN?

By type of holder
Institutions 75.0% Insiders 4.4% Everyone else 20.6%
Concentration Top 10 holders own 46.4%
Hartree Partners, LP 10.5% · Westerly Capital Management, LLC 8.0%
Institutional ownership
75.0%
-3.4 pts vs last qtr
Institutional holders
150
-10 vs last qtr
Net shares bought
−1.4M
by institutions in Q2 2026
New / sold out
25 / 35
positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026
  • Hartree Partners, LP +611.9K
  • Nuveen, LLC +392.8K

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Biggest sellers in Q2 2026
  • New South Capital Management Inc SOLD OUT −1.2M
  • Segall Bryant & Hamill, LLC SOLD OUT −628.3K

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Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for Hudson Technologies Inc in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2016–FY2025
+27.4%
+2.72% a year
Each share's claim on the business
−21.5%
shrank without buying or selling a share
Spent on buybacks vs paid in stock
$28.1M vs $11.8M
over 10 fiscal years
Diluted shares, split-adjusted
34.4M41.1M47.8M2016: 35.4M shares'162017: 42.8M shares'172018: 42.5M shares'182019: 42.6M shares'192020: 42.7M shares'202021: 46.6M shares'212022: 47.1M shares'222023: 47.3M shares'232024: 47.1M shares'242025: 45.1M shares'25
Buybacks Stock-based comp
$0$10.0M$20.0M2016 buybacks: $02016 stock comp: $706.0K'162017 buybacks: $02017 stock comp: $1.5M'172018 buybacks: $02018 stock comp: $1.4M'182019 buybacks: $02019 stock comp: $1.8M'192020 buybacks: $02020 stock comp: $656.0K'202021 buybacks: $02021 stock comp: $511.0K'212022 buybacks: $02022 stock comp: $922.0K'222023 buybacks: $02023 stock comp: $2.3M'232024 buybacks: $8.1M2024 stock comp: $842.0K'242025 buybacks: $20.0M2025 stock comp: $1.1M'25

How patient are the owners?

Institutional shares by how long they've been held
5+ years39% 3–5 years18% 1–3 years30% Under 1 year13%
Quarterly turnover
14.5%
of institutional shares changed hands
Top 10 managers, median time held
5 years

Super Investors

Investment managers reporting HDSN on Form 13F
HP
Hartree Partners, LP
Shares
4.4M
% of company
10.48%
Change vs last qtr
+611.9K (+16.1%)
Held since
2025
WC
Westerly Capital Management, LLC
Shares
3.4M
% of company
8.03%
Change vs last qtr
+205.0K (+6.5%)
Held since
2021

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Institutional Funds

Mutual funds and ETFs reporting HDSN on Form N-PORT; together they hold 23.7% of the company
VT
Vanguard Total Stock Market Index Fund
Vanguard Index Funds
Position value
$6.83M
% of company
2.83%
% of the fund
0.00%
As of
June 30, 2026
AU
Avantis U.S. Small Cap Value ETF
American Century ETF Trust
Position value
$5.98M
% of company
2.67%
% of the fund
0.02%
As of
May 31, 2026

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Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G
CB
Coleman Brian F
Insider
Shares
757.4K
% of company
1.80%
Change vs last qtr
—
Held since
—
AV
Abbatecola Vincent P
Insider
Shares
579.7K
% of company
1.38%
Change vs last qtr
—
Held since
—

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