Who owns Hudson Technologies (HDSN)
Which tracked institutional funds hold HDSN, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See HDSN company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
10 tracked funds added or opened HDSN while 22 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
HDSN’s largest tracked holder by dollar value, Hartree Partners, LP, sizes it at 5.4% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 5.4pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in HDSN divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 146 tracked filers holding HDSN, 71 increased or opened the position and 91 reduced or closed it; over the same quarter, open-market insider Form 4s were net purchases. A multi-insider buy cluster also fired inside the quarter.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in HDSN between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 1
- Ancora Advisors LLC$2M
Full exits 7
- NEW SOUTH CAPITAL MANAGEMENT INC$7M
- SEGALL BRYANT & HAMILL, LLC$4M
- LAZARD ASSET MANAGEMENT LLC$2M
- O'SHAUGHNESSY ASSET MANAGEMENT, LLC$1M
- GRIMES & Co WEALTH MANAGEMENT, LLC$933K
- KBC Group NV$723K
Largest adds
- Hartree Partners, LP$3M
- Nuveen, LLC$2M
- Qube Research & Technologies Ltd$2M
- JACOBS LEVY EQUITY MANAGEMENT, INC$2M
- MARSHALL WACE, LLP$1M
- Kerrisdale Advisers, LLC$1M
Largest trims
- PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO$2M
- AMERICAN CENTURY COMPANIES INC$2M
- DIMENSIONAL FUND ADVISORS LP$1M
- AQR CAPITAL MANAGEMENT LLC$1M
- TWO SIGMA INVESTMENTS, LP$847K
- NORTHERN TRUST CORP$730K
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| Hartree Partners, LP added | 4,411,889 | $25M | 14.1% | 2026-Q2 |
| WESTERLY CAPITAL MANAGEMENT, LLC added | 3,380,000 | $19M | 10.8% | 2026-Q2 |
| BlackRock, Inc. trimmed | 2,840,272 | $16M | 9.1% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 1,967,914 | $11M | 6.3% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC trimmed | 1,654,259 | $9M | 5.3% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 1,442,115 | $8M | 4.6% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC trimmed | 1,169,462 | $7M | 3.7% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 995,011 | $6M | 3.2% | 2026-Q2 |
| STATE STREET CORP trimmed | 895,776 | $5M | 2.9% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 777,989 | $4M | 2.5% | 2026-Q2 |
| CASPIAN CAPITAL LP | 728,306 | $4M | 2.3% | 2026-Q2 |
| Qube Research & Technologies Ltd added | 721,847 | $4M | 2.3% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 574,266 | $3M | 1.8% | 2026-Q2 |
| JACOBS LEVY EQUITY MANAGEMENT, INC added | 506,591 | $3M | 1.6% | 2026-Q2 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC trimmed | 494,432 | $3M | 1.6% | 2026-Q2 |
| Nuveen, LLC added | 476,540 | $3M | 1.5% | 2026-Q2 |
| MARSHALL WACE, LLP added | 474,354 | $3M | 1.5% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 409,591 | $2M | 1.3% | 2026-Q2 |
| MORGAN STANLEY trimmed | 367,159 | $2M | 1.2% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 362,489 | $2M | 1.2% | 2026-Q2 |
| 683 Capital Management, LLC | 325,000 | $2M | 1.0% | 2026-Q2 |
| JB CAPITAL PARTNERS LP | 306,200 | $2M | 1.0% | 2026-Q2 |
| Ancora Advisors LLC new | 303,380 | $2M | 1.0% | 2026-Q2 |
| Kerrisdale Advisers, LLC added | 299,976 | $2M | 1.0% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 290,537 | $2M | 0.9% | 2026-Q2 |
| NORTHERN TRUST CORP trimmed | 282,011 | $2M | 0.9% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 245,071 | $1M | 0.8% | 2026-Q2 |
| Empowered Funds, LLC added | 205,878 | $1M | 0.7% | 2026-Q2 |
| Bank of New York Mellon Corp trimmed | 204,779 | $1M | 0.7% | 2026-Q2 |
| KESTREL INVESTMENT MANAGEMENT CORP | 200,750 | $1M | 0.6% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 176,708 | $1M | 0.6% | 2026-Q2 |
| Pacific Ridge Capital Partners, LLC added | 174,539 | $1M | 0.6% | 2026-Q2 |
| MARATHON CAPITAL MANAGEMENT trimmed | 173,325 | $995K | 0.6% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 161,903 | $929K | 0.5% | 2026-Q2 |
| FIRST TRUST ADVISORS LP added | 151,809 | $871K | 0.5% | 2026-Q2 |
| Numerai GP LLC trimmed | 150,254 | $862K | 0.5% | 2026-Q2 |
| CREDIT AGRICOLE S A | 140,000 | $804K | 0.4% | 2026-Q2 |
| WEDGE CAPITAL MANAGEMENT L L P/NC trimmed | 137,618 | $790K | 0.4% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP trimmed | 131,960 | $757K | 0.4% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC | 121,740 | $699K | 0.4% | 2026-Q2 |
| Inspire Investing, LLC added | 119,191 | $684K | 0.4% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 109,013 | $626K | 0.3% | 2026-Q2 |
| Quantinno Capital Management LP added | 106,964 | $614K | 0.3% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 98,394 | $565K | 0.3% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 95,960 | $551K | 0.3% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 93,739 | $514K | 0.3% | 2026-Q2 |
| Invesco Ltd. trimmed | 70,075 | $402K | 0.2% | 2026-Q2 |
| PINNACLE ASSOCIATES LTD | 70,000 | $402K | 0.2% | 2026-Q2 |
| Squarepoint Ops LLC added | 66,220 | $380K | 0.2% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 61,117 | $351K | 0.2% | 2026-Q2 |
| UBS Group AG added | 58,368 | $335K | 0.2% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 57,906 | $332K | 0.2% | 2026-Q2 |
| ISTHMUS PARTNERS, LLC added | 57,456 | $330K | 0.2% | 2026-Q2 |
| BAILARD, INC. new | 56,574 | $325K | 0.2% | 2026-Q2 |
| Inspire Advisors, LLC added | 54,249 | $311K | 0.2% | 2026-Q2 |
| PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO trimmed | 51,499 | $296K | 0.2% | 2026-Q2 |
| Odyssean, LLC new | 50,673 | $291K | 0.2% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 50,040 | $287K | 0.2% | 2026-Q2 |
| Schonfeld Strategic Advisors LLC added | 49,528 | $284K | 0.2% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 46,710 | $275K | 0.2% | 2026-Q2 |
| Sanctuary Advisors, LLC added | 46,344 | $266K | 0.1% | 2026-Q2 |
| EXCHANGE TRADED CONCEPTS, LLC added | 46,108 | $265K | 0.1% | 2026-Q2 |
| Point72 Asset Management, L.P. trimmed | 45,731 | $262K | 0.1% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 45,095 | $259K | 0.1% | 2026-Q2 |
| COMMONWEALTH EQUITY SERVICES, LLC added | 42,504 | $244K | 0.1% | 2026-Q2 |
| CANADA PENSION PLAN INVESTMENT BOARD trimmed | 42,500 | $244K | 0.1% | 2026-Q2 |
| EntryPoint Capital, LLC added | 33,461 | $192K | 0.1% | 2026-Q2 |
| Campbell & CO Investment Adviser LLC trimmed | 32,995 | $189K | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 32,878 | $189K | 0.1% | 2026-Q2 |
| Atlantic Union Bankshares Corp | 31,250 | $179K | 0.1% | 2026-Q2 |
| Vident Advisory, LLC | 30,875 | $177K | 0.1% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC trimmed | 30,375 | $174K | 0.1% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD trimmed | 29,550 | $170K | 0.1% | 2026-Q2 |
| Jump Financial, LLC trimmed | 27,943 | $160K | 0.1% | 2026-Q2 |
| Park Capital Management, LLC / WI new | 27,078 | $155K | 0.1% | 2026-Q2 |
| Graham Capital Management, L.P. trimmed | 26,736 | $153K | 0.1% | 2026-Q2 |
| FIFTH THIRD BANCORP trimmed | 24,585 | $141K | 0.1% | 2026-Q2 |
| MetLife Investment Management, LLC added | 22,591 | $130K | 0.1% | 2026-Q2 |
| XTX Topco Ltd trimmed | 21,149 | $121K | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 18,883 | $108K | 0.1% | 2026-Q2 |
| Connor, Clark & Lunn Investment Management Ltd. new | 18,546 | $106K | 0.1% | 2026-Q2 |
| Boston Partners trimmed | 18,221 | $105K | 0.1% | 2026-Q2 |
| Symmetry Partners, LLC new | 18,033 | $104K | 0.1% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. trimmed | 17,193 | $99K | 0.1% | 2026-Q2 |
| Empirical Asset Management, LLC new | 17,059 | $98K | 0.1% | 2026-Q2 |
| EP Wealth Advisors, LLC trimmed | 16,875 | $97K | 0.1% | 2026-Q2 |
| OSAIC HOLDINGS, INC. trimmed | 16,809 | $96K | 0.1% | 2026-Q2 |
| Commonwealth Financial Services, LLC new | 16,728 | $96K | 0.1% | 2026-Q2 |
| Fifth Third Wealth Advisors LLC new | 16,445 | $94K | 0.1% | 2026-Q2 |
| Quadrature Capital Ltd trimmed | 16,395 | $94K | 0.1% | 2026-Q2 |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC trimmed | 15,133 | $98K | 0.1% | 2026-Q2 |
| MERCER GLOBAL ADVISORS INC /ADV added | 15,081 | $87K | 0.0% | 2026-Q2 |
| Vanguard Global Advisers, LLC | 14,929 | $86K | 0.0% | 2026-Q2 |
| HUB Investment Partners, LLC new | 14,918 | $86K | 0.0% | 2026-Q2 |
| Inscription Capital, LLC new | 14,032 | $81K | 0.0% | 2026-Q2 |
| State of Wyoming trimmed | 13,503 | $78K | 0.0% | 2026-Q2 |
| BROWN BROTHERS HARRIMAN & CO | 13,263 | $76K | 0.0% | 2026-Q2 |
| ANCHYRA PARTNERS LLC new | 13,063 | $75K | 0.0% | 2026-Q2 |
| FMR LLC trimmed | 13,023 | $75K | 0.0% | 2026-Q2 |
| Cardinal Point Capital Management ULC | 12,850 | $74K | 0.0% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.