Who owns Eton Pharmaceuticals (ETON)
Which tracked institutional funds hold ETON, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See ETON 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
The tracked-fund tape on ETON is one-sided between 2026-Q1 and 2026-Q2: 73 added or opened and 13 trimmed or exited — on balance accumulating.
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
ETON’s largest tracked holder by dollar value, Opaleye Management Inc., sizes it at 9.4% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 9.4pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in ETON 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 157 tracked filers holding ETON, 107 increased or opened the position and 44 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
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 ETON 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 20
- D. E. Shaw & Co., Inc.$7M
- NORGES BANK$6M
- Prospect Capital Advisors, LLC$6M
- WASATCH ADVISORS LP$3M
- Squarepoint Ops LLC$2M
- Point72 Asset Management, L.P.$2M
Full exits 3
- THOMPSON SIEGEL & WALMSLEY LLC$10M
- Soleus Capital Management, L.P.$4M
- Manatuck Hill Partners, LLC$987K
Largest adds
- Opaleye Management Inc.$33M
- BlackRock, Inc.$26M
- EcoR1 Capital, LLC$25M
- MORGAN STANLEY$16M
- Nantahala Capital Management, LLC$14M
- STATE STREET CORP$12M
Largest trims
- CANNELL CAPITAL LLC$2M
- RENAISSANCE TECHNOLOGIES LLC$2M
- UBS Group AG$2M
- Diametric Capital, LP$1M
- XTX Topco Ltd$1M
- CITADEL ADVISORS LLC$888K
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 |
|---|---|---|---|---|
| Opaleye Management Inc. | 2,860,000 | $104M | 14.7% | 2026-Q2 |
| EcoR1 Capital, LLC | 2,171,938 | $79M | 11.2% | 2026-Q2 |
| BlackRock, Inc. added | 1,895,833 | $69M | 9.7% | 2026-Q2 |
| Nantahala Capital Management, LLC | 1,175,951 | $43M | 6.0% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC trimmed | 976,570 | $35M | 5.0% | 2026-Q2 |
| MORGAN STANLEY added | 767,972 | $28M | 3.9% | 2026-Q2 |
| STATE STREET CORP added | 701,786 | $25M | 3.6% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 652,303 | $24M | 3.4% | 2026-Q2 |
| OBERWEIS ASSET MANAGEMENT INC/ added | 501,600 | $18M | 2.6% | 2026-Q2 |
| National Philanthropic Trust | 492,112 | $18M | 2.5% | 2026-Q2 |
| Westside Investment Management, Inc. trimmed | 431,160 | $16M | 2.2% | 2026-Q2 |
| Pillsbury Lake Capital LLC added | 387,157 | $14M | 2.0% | 2026-Q2 |
| Nuveen, LLC added | 375,707 | $14M | 1.9% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 322,466 | $12M | 1.7% | 2026-Q2 |
| Woodline Partners LP added | 310,879 | $11M | 1.6% | 2026-Q2 |
| NORTHERN TRUST CORP added | 255,849 | $9M | 1.3% | 2026-Q2 |
| MARSHALL WACE, LLP added | 249,182 | $9M | 1.3% | 2026-Q2 |
| Panoramic Capital, LLC added | 208,192 | $8M | 1.1% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 194,591 | $7M | 1.0% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 191,635 | $7M | 1.0% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 188,452 | $7M | 1.0% | 2026-Q2 |
| JANE STREET GROUP, LLC added | 185,697 | $7M | 1.0% | 2026-Q2 |
| Lumbard & Kellner, LLC trimmed | 175,909 | $6M | 0.9% | 2026-Q2 |
| CANNELL CAPITAL LLC trimmed | 170,747 | $6M | 0.9% | 2026-Q2 |
| NORGES BANK new | 169,500 | $6M | 0.9% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 168,539 | $6M | 0.9% | 2026-Q2 |
| Informed Momentum Co LLC added | 158,045 | $6M | 0.8% | 2026-Q2 |
| Prospect Capital Advisors, LLC new | 157,200 | $6M | 0.8% | 2026-Q2 |
| Aristides Capital LLC trimmed | 145,410 | $5M | 0.7% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 142,257 | $5M | 0.7% | 2026-Q2 |
| PRELUDE CAPITAL MANAGEMENT, LLC trimmed | 137,572 | $5M | 0.7% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 132,583 | $5M | 0.7% | 2026-Q2 |
| Bank of New York Mellon Corp added | 118,249 | $4M | 0.6% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 116,291 | $4M | 0.6% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 114,655 | $4M | 0.6% | 2026-Q2 |
| WASATCH ADVISORS LP trimmed | 92,742 | $3M | 0.5% | 2026-Q2 |
| Bridge City Capital, LLC added | 88,132 | $3M | 0.5% | 2026-Q2 |
| Walleye Capital LLC added | 86,249 | $3M | 0.4% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 77,032 | $3M | 0.4% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP added | 76,103 | $3M | 0.4% | 2026-Q2 |
| Diametric Capital, LP trimmed | 73,101 | $3M | 0.4% | 2026-Q2 |
| Numerai GP LLC added | 70,114 | $3M | 0.4% | 2026-Q2 |
| UBS Group AG trimmed | 65,424 | $2M | 0.3% | 2026-Q2 |
| Squarepoint Ops LLC added | 59,562 | $2M | 0.3% | 2026-Q2 |
| BOOTHBAY FUND MANAGEMENT, LLC added | 57,516 | $2M | 0.3% | 2026-Q2 |
| BARCLAYS PLC added | 56,181 | $2M | 0.3% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 52,300 | $2M | 0.3% | 2026-Q2 |
| CITADEL ADVISORS LLC trimmed | 48,969 | $2M | 0.3% | 2026-Q2 |
| POLEN CAPITAL MANAGEMENT LLC added | 45,379 | $2M | 0.2% | 2026-Q2 |
| Point72 Asset Management, L.P. added | 44,918 | $2M | 0.2% | 2026-Q2 |
| Aquatic Capital Management LLC added | 43,794 | $2M | 0.2% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP new | 42,484 | $2M | 0.2% | 2026-Q2 |
| HSBC HOLDINGS PLC new | 40,974 | $2M | 0.2% | 2026-Q2 |
| ANCHOR CAPITAL ADVISORS LLC trimmed | 40,619 | $1M | 0.2% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 34,698 | $1M | 0.2% | 2026-Q2 |
| Jefferies Financial Group Inc. trimmed | 34,027 | $1M | 0.2% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 33,703 | $1M | 0.2% | 2026-Q2 |
| Y-Intercept (Hong Kong) Ltd added | 33,542 | $1M | 0.2% | 2026-Q2 |
| Invesco Ltd. added | 33,384 | $1M | 0.2% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND added | 32,779 | $1M | 0.2% | 2026-Q2 |
| BLAIR WILLIAM & CO/IL added | 32,419 | $1M | 0.2% | 2026-Q2 |
| Riggs Asset Managment Co. Inc. new | 32,046 | $1M | 0.2% | 2026-Q2 |
| Sigma Planning Corp new | 30,000 | $1M | 0.2% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 29,125 | $1M | 0.1% | 2026-Q2 |
| JUNCTURE WEALTH STRATEGIES, LLC added | 28,849 | $1M | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 28,250 | $697K | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 26,522 | $960K | 0.1% | 2026-Q2 |
| STRS OHIO new | 23,600 | $854K | 0.1% | 2026-Q2 |
| Guilbault Capital LLC added | 23,460 | $849K | 0.1% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 21,932 | $794K | 0.1% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC new | 21,133 | $765K | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 20,952 | $758K | 0.1% | 2026-Q2 |
| ESSEX INVESTMENT MANAGEMENT CO LLC trimmed | 20,131 | $729K | 0.1% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD added | 19,544 | $707K | 0.1% | 2026-Q2 |
| FIRST TRUST ADVISORS LP new | 19,477 | $705K | 0.1% | 2026-Q2 |
| NAVELLIER & ASSOCIATES INC added | 18,010 | $652K | 0.1% | 2026-Q2 |
| BANK OF NOVA SCOTIA added | 17,200 | $623K | 0.1% | 2026-Q2 |
| CHICAGO TRUST Co NA | 16,700 | $605K | 0.1% | 2026-Q2 |
| Man Group plc added | 16,152 | $585K | 0.1% | 2026-Q2 |
| Gotham Asset Management, LLC new | 15,982 | $579K | 0.1% | 2026-Q2 |
| LOS ANGELES CAPITAL MANAGEMENT LLC added | 15,675 | $567K | 0.1% | 2026-Q2 |
| MetLife Investment Management, LLC added | 15,673 | $567K | 0.1% | 2026-Q2 |
| PDT Partners, LLC | 14,891 | $539K | 0.1% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 14,505 | $525K | 0.1% | 2026-Q2 |
| Vanguard Global Advisers, LLC added | 14,165 | $513K | 0.1% | 2026-Q2 |
| LPL Financial LLC new | 14,017 | $507K | 0.1% | 2026-Q2 |
| Connor, Clark & Lunn Investment Management Ltd. trimmed | 13,150 | $476K | 0.1% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC added | 12,444 | $450K | 0.1% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 12,296 | $445K | 0.1% | 2026-Q2 |
| Legato Capital Management LLC new | 11,521 | $417K | 0.1% | 2026-Q2 |
| Quantum Private Wealth, LLC | 11,500 | $416K | 0.1% | 2026-Q2 |
| Menard Financial Group LLC new | 10,642 | $385K | 0.1% | 2026-Q2 |
| &PARTNERS new | 10,000 | $362K | 0.1% | 2026-Q2 |
| MACKENZIE FINANCIAL CORP new | 9,590 | $347K | 0.0% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC trimmed | 9,582 | $347K | 0.0% | 2026-Q2 |
| BRC Group Holdings, Inc. trimmed | 9,383 | $340K | 0.0% | 2026-Q2 |
| Granite Investment Partners, LLC | 8,479 | $307K | 0.0% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 8,167 | $296K | 0.0% | 2026-Q2 |
| Brevan Howard Capital Management LP trimmed | 7,955 | $288K | 0.0% | 2026-Q2 |
| CANADA PENSION PLAN INVESTMENT BOARD trimmed | 7,900 | $286K | 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.