Who owns ETON (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-Q1 13F filings. 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 2025-Q4 and 2026-Q1: 51 added or opened and 5 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 9.3% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 9.3pp 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 2025-Q4 and 2026-Q1, across 116 tracked filers holding ETON, 67 increased or opened the position and 49 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
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 2025-Q4 and 2026-Q1 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 16
- VANGUARD CAPITAL MANAGEMENT LLC$25M
- Pillsbury Lake Capital LLC$9M
- Panoramic Capital, LLC$5M
- Soleus Capital Management, L.P.$4M
- VANGUARD FIDUCIARY TRUST CO$4M
- VANGUARD PORTFOLIO MANAGEMENT LLC$4M
Full exits 3
- VANGUARD GROUP INC$23M
- Jefferies Financial Group Inc.$2M
- BRIDGEWAY CAPITAL MANAGEMENT, LLC$1M
Largest adds
- Opaleye Management Inc.$22M
- EcoR1 Capital, LLC$19M
- BlackRock, Inc.$13M
- Nantahala Capital Management, LLC$9M
- CANNELL CAPITAL LLC$5M
- GEODE CAPITAL MANAGEMENT, LLC$5M
Largest trims
- MILLENNIUM MANAGEMENT LLC$973K
- Russell Investments Group, Ltd.$774K
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| Opaleye Management Inc. | 2,860,000 | $71M | 14.6% | 2026-Q1 |
| EcoR1 Capital, LLC added | 2,171,938 | $54M | 11.0% | 2026-Q1 |
| BlackRock, Inc. trimmed | 1,717,286 | $42M | 8.7% | 2026-Q1 |
| Nantahala Capital Management, LLC | 1,175,951 | $29M | 6.0% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 994,089 | $25M | 5.1% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 577,666 | $14M | 2.9% | 2026-Q1 |
| STATE STREET CORP added | 530,215 | $13M | 2.7% | 2026-Q1 |
| National Philanthropic Trust | 492,112 | $12M | 2.5% | 2026-Q1 |
| MORGAN STANLEY trimmed | 477,957 | $12M | 2.4% | 2026-Q1 |
| Westside Investment Management, Inc. trimmed | 467,915 | $12M | 2.4% | 2026-Q1 |
| OBERWEIS ASSET MANAGEMENT INC/ added | 439,300 | $11M | 2.2% | 2026-Q1 |
| THOMPSON SIEGEL & WALMSLEY LLC trimmed | 406,089 | $10M | 2.1% | 2026-Q1 |
| Pillsbury Lake Capital LLC new | 364,954 | $9M | 1.9% | 2026-Q1 |
| CANNELL CAPITAL LLC added | 341,985 | $8M | 1.7% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 302,108 | $7M | 1.5% | 2026-Q1 |
| NORTHERN TRUST CORP added | 237,832 | $6M | 1.2% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 217,446 | $5M | 1.1% | 2026-Q1 |
| PRELUDE CAPITAL MANAGEMENT, LLC added | 188,802 | $5M | 1.0% | 2026-Q1 |
| Aristides Capital LLC added | 186,041 | $5M | 0.9% | 2026-Q1 |
| Panoramic Capital, LLC new | 185,000 | $5M | 0.9% | 2026-Q1 |
| Lumbard & Kellner, LLC added | 175,911 | $4M | 0.9% | 2026-Q1 |
| Woodline Partners LP added | 170,699 | $4M | 0.9% | 2026-Q1 |
| UBS Group AG added | 168,958 | $4M | 0.9% | 2026-Q1 |
| Soleus Capital Management, L.P. trimmed | 166,381 | $4M | 0.8% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 164,715 | $4M | 0.8% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 163,321 | $4M | 0.8% | 2026-Q1 |
| Diametric Capital, LP trimmed | 156,926 | $4M | 0.8% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 169,876 | $4M | 0.8% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 151,748 | $4M | 0.8% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 144,367 | $4M | 0.7% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 111,255 | $3M | 0.6% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 107,815 | $3M | 0.5% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 106,393 | $3M | 0.5% | 2026-Q1 |
| JANE STREET GROUP, LLC added | 95,420 | $2M | 0.5% | 2026-Q1 |
| Walleye Capital LLC new | 81,963 | $2M | 0.4% | 2026-Q1 |
| MARSHALL WACE, LLP added | 74,820 | $2M | 0.4% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 70,124 | $2M | 0.4% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 68,795 | $2M | 0.3% | 2026-Q1 |
| SEI INVESTMENTS CO trimmed | 58,034 | $1M | 0.3% | 2026-Q1 |
| Nuveen, LLC trimmed | 57,950 | $1M | 0.3% | 2026-Q1 |
| BOOTHBAY FUND MANAGEMENT, LLC added | 55,605 | $1M | 0.3% | 2026-Q1 |
| XTX Topco Ltd added | 51,772 | $1M | 0.3% | 2026-Q1 |
| BARCLAYS PLC trimmed | 49,374 | $1M | 0.3% | 2026-Q1 |
| Informed Momentum Co LLC trimmed | 48,623 | $1M | 0.2% | 2026-Q1 |
| Connor, Clark & Lunn Investment Management Ltd. trimmed | 42,693 | $1M | 0.2% | 2026-Q1 |
| ANCHOR CAPITAL ADVISORS LLC added | 40,858 | $1M | 0.2% | 2026-Q1 |
| Manatuck Hill Partners, LLC new | 40,000 | $987K | 0.2% | 2026-Q1 |
| Numerai GP LLC new | 37,356 | $922K | 0.2% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 34,084 | $841K | 0.2% | 2026-Q1 |
| BLAIR WILLIAM & CO/IL | 32,400 | $800K | 0.2% | 2026-Q1 |
| RHUMBLINE ADVISERS added | 30,726 | $758K | 0.2% | 2026-Q1 |
| POLEN CAPITAL MANAGEMENT LLC new | 30,138 | $744K | 0.2% | 2026-Q1 |
| Guilbault Capital LLC | 23,225 | $573K | 0.1% | 2026-Q1 |
| Invesco Ltd. added | 22,874 | $565K | 0.1% | 2026-Q1 |
| Brevan Howard Capital Management LP added | 22,506 | $555K | 0.1% | 2026-Q1 |
| Bridge City Capital, LLC added | 21,150 | $522K | 0.1% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 21,136 | $522K | 0.1% | 2026-Q1 |
| ESSEX INVESTMENT MANAGEMENT CO LLC | 20,182 | $498K | 0.1% | 2026-Q1 |
| JUNCTURE WEALTH STRATEGIES, LLC added | 19,181 | $473K | 0.1% | 2026-Q1 |
| STATE OF WISCONSIN INVESTMENT BOARD trimmed | 18,644 | $460K | 0.1% | 2026-Q1 |
| HighTower Advisors, LLC new | 18,423 | $455K | 0.1% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 17,652 | $436K | 0.1% | 2026-Q1 |
| CHICAGO TRUST Co NA | 16,700 | $412K | 0.1% | 2026-Q1 |
| MetLife Investment Management, LLC | 15,537 | $383K | 0.1% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC trimmed | 14,939 | $369K | 0.1% | 2026-Q1 |
| PDT Partners, LLC | 14,891 | $368K | 0.1% | 2026-Q1 |
| BANK OF NOVA SCOTIA new | 15,000 | $365K | 0.1% | 2026-Q1 |
| Voleon Capital Management LP trimmed | 13,290 | $328K | 0.1% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC | 12,250 | $302K | 0.1% | 2026-Q1 |
| Aquatic Capital Management LLC trimmed | 12,061 | $298K | 0.1% | 2026-Q1 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 12,038 | $297K | 0.1% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC new | 11,926 | $294K | 0.1% | 2026-Q1 |
| Quantum Private Wealth, LLC | 11,500 | $284K | 0.1% | 2026-Q1 |
| ENVESTNET ASSET MANAGEMENT INC trimmed | 10,739 | $265K | 0.1% | 2026-Q1 |
| LOS ANGELES CAPITAL MANAGEMENT LLC trimmed | 10,269 | $253K | 0.1% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 9,559 | $236K | 0.0% | 2026-Q1 |
| VANGUARD GROUP INC added | 1,348,668 | $23M | 4.7% | 2025-Q4 stale |
| Divisadero Street Capital Management, LP trimmed | 298,000 | $6M | 1.3% | 2025-Q3 stale |
| SUMMIT WEALTH GROUP LLC / CO new | 25,999 | $3M | 0.7% | 2025-Q3 stale |
| Apis Capital Advisors, LLC added | 117,600 | $3M | 0.5% | 2025-Q3 stale |
| Jefferies Financial Group Inc. added | 118,300 | $2M | 0.4% | 2025-Q4 stale |
| STIFEL FINANCIAL CORP trimmed | 108,168 | $2M | 0.3% | 2025-Q2 stale |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC trimmed | 84,020 | $1M | 0.3% | 2025-Q4 stale |
| Cubist Systematic Strategies, LLC added | 103,200 | $1M | 0.3% | 2025-Q1 stale |
| JACOBS LEVY EQUITY MANAGEMENT, INC | 54,275 | $773K | 0.2% | 2025-Q2 stale |
| WINTON GROUP Ltd new | 35,304 | $767K | 0.2% | 2025-Q3 stale |
| HRT FINANCIAL LP added | 57,235 | $742K | 0.2% | 2025-Q1 stale |
| BALYASNY ASSET MANAGEMENT L.P. added | 50,205 | $652K | 0.1% | 2025-Q1 stale |
| ACADIAN ASSET MANAGEMENT LLC trimmed | 26,410 | $573K | 0.1% | 2025-Q3 stale |
| Calamos Advisors LLC new | 23,634 | $514K | 0.1% | 2025-Q3 stale |
| Qube Research & Technologies Ltd trimmed | 34,557 | $492K | 0.1% | 2025-Q2 stale |
| OMERS ADMINISTRATION Corp trimmed | 35,300 | $458K | 0.1% | 2025-Q1 stale |
| BRC Group Holdings, Inc. new | 31,504 | $449K | 0.1% | 2025-Q2 stale |
| Hillsdale Investment Management Inc. trimmed | 18,503 | $402K | 0.1% | 2025-Q3 stale |
| NAVELLIER & ASSOCIATES INC new | 17,494 | $380K | 0.1% | 2025-Q3 stale |
| Sheets Smith Investment Management new | 14,842 | $323K | 0.1% | 2025-Q3 stale |
| GSA CAPITAL PARTNERS LLP trimmed | 14,785 | $321K | 0.1% | 2025-Q3 stale |
| Schonfeld Strategic Advisors LLC trimmed | 24,213 | $314K | 0.1% | 2025-Q1 stale |
| D. E. Shaw & Co., Inc. added | 15,331 | $259K | 0.1% | 2025-Q4 stale |
| TWO SIGMA ADVISERS, LP trimmed | 14,700 | $249K | 0.1% | 2025-Q4 stale |
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.