Who owns EOLS (EOLS)
Which tracked institutional funds hold EOLS, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See EOLS 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 EOLS is one-sided between 2025-Q4 and 2026-Q1: 10 added or opened and 45 trimmed or exited — on balance reducing.
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
EOLS’s largest tracked holder by dollar value, Nantahala Capital Management, LLC, sizes it at 1.6% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 1.6pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in EOLS 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 147 tracked filers holding EOLS, 83 increased or opened the position and 92 reduced or closed it; over the same quarter, open-market insider Form 4 buying and selling roughly offset.
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 EOLS 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 5
- VANGUARD CAPITAL MANAGEMENT LLC$10M
- PERCEPTIVE ADVISORS LLC$5M
- VANGUARD PORTFOLIO MANAGEMENT LLC$2M
- VANGUARD FIDUCIARY TRUST CO$2M
- Caption Management, LLC$889K
Full exits 13
- VANGUARD GROUP INC$22M
- SCHRODER INVESTMENT MANAGEMENT GROUP$7M
- Buckley Capital Advisors, LLC$5M
- EcoR1 Capital, LLC$4M
- HRT FINANCIAL LP$3M
- JANE STREET GROUP, LLC$3M
Largest adds
- GOLDMAN SACHS GROUP INC$2M
- Soleus Capital Management, L.P.$2M
- Trexquant Investment LP$1M
- Assenagon Asset Management S.A.$661K
- NATIXIS$572K
Largest trims
- Nantahala Capital Management, LLC$12M
- BlackRock, Inc.$10M
- D. E. Shaw & Co., Inc.$8M
- MILLENNIUM MANAGEMENT LLC$8M
- BRAIDWELL LP$8M
- Frazier Life Sciences Management, L.P.$7M
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 |
|---|---|---|---|---|
| Nantahala Capital Management, LLC added | 6,376,857 | $26M | 7.5% | 2026-Q1 |
| BlackRock, Inc. added | 4,290,383 | $18M | 5.0% | 2026-Q1 |
| BRAIDWELL LP | 3,105,209 | $13M | 3.7% | 2026-Q1 |
| Frazier Life Sciences Management, L.P. | 2,630,665 | $11M | 3.1% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 2,470,408 | $10M | 2.9% | 2026-Q1 |
| Soleus Capital Management, L.P. added | 2,245,360 | $9M | 2.6% | 2026-Q1 |
| Stonepine Capital Management, LLC added | 1,759,091 | $7M | 2.1% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC trimmed | 1,461,159 | $6M | 1.7% | 2026-Q1 |
| ARMISTICE CAPITAL, LLC added | 1,396,000 | $6M | 1.6% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 1,381,338 | $6M | 1.6% | 2026-Q1 |
| STATE STREET CORP trimmed | 1,320,790 | $5M | 1.6% | 2026-Q1 |
| PERCEPTIVE ADVISORS LLC trimmed | 1,286,862 | $5M | 1.5% | 2026-Q1 |
| RICE HALL JAMES & ASSOCIATES, LLC added | 1,254,819 | $5M | 1.5% | 2026-Q1 |
| PINNACLE ASSOCIATES LTD added | 1,158,895 | $5M | 1.4% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 1,086,398 | $4M | 1.3% | 2026-Q1 |
| UBS Group AG trimmed | 752,881 | $3M | 0.9% | 2026-Q1 |
| CITADEL ADVISORS LLC trimmed | 696,629 | $3M | 0.8% | 2026-Q1 |
| Soviero Asset Management, LP added | 680,373 | $3M | 0.8% | 2026-Q1 |
| AWH Capital, L.P. | 625,000 | $3M | 0.7% | 2026-Q1 |
| Assenagon Asset Management S.A. added | 598,145 | $2M | 0.7% | 2026-Q1 |
| D. E. Shaw & Co., Inc. trimmed | 559,050 | $2M | 0.7% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 515,516 | $2M | 0.6% | 2026-Q1 |
| TANG CAPITAL MANAGEMENT LLC trimmed | 483,021 | $2M | 0.6% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 477,077 | $2M | 0.6% | 2026-Q1 |
| NORTHERN TRUST CORP added | 472,343 | $2M | 0.6% | 2026-Q1 |
| STIFEL FINANCIAL CORP added | 458,396 | $2M | 0.5% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 441,655 | $2M | 0.5% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 424,658 | $2M | 0.5% | 2026-Q1 |
| CM Management, LLC added | 400,000 | $2M | 0.5% | 2026-Q1 |
| Trexquant Investment LP added | 375,210 | $2M | 0.4% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 339,025 | $1M | 0.4% | 2026-Q1 |
| MORGAN STANLEY trimmed | 240,133 | $987K | 0.3% | 2026-Q1 |
| Caption Management, LLC trimmed | 216,316 | $889K | 0.3% | 2026-Q1 |
| AMERICAN ASSETS INC trimmed | 110,000 | $883K | 0.3% | 2026-Q1 |
| National Philanthropic Trust | 200,000 | $822K | 0.2% | 2026-Q1 |
| Squarepoint Ops LLC trimmed | 158,392 | $651K | 0.2% | 2026-Q1 |
| Krensavage Asset Management, LLC added | 157,985 | $649K | 0.2% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 155,248 | $638K | 0.2% | 2026-Q1 |
| Bank of New York Mellon Corp added | 143,164 | $588K | 0.2% | 2026-Q1 |
| Potomac Capital Management, Inc. added | 141,500 | $582K | 0.2% | 2026-Q1 |
| NATIXIS added | 141,437 | $581K | 0.2% | 2026-Q1 |
| Quantinno Capital Management LP added | 124,761 | $513K | 0.1% | 2026-Q1 |
| Nuveen, LLC added | 111,602 | $459K | 0.1% | 2026-Q1 |
| Campbell & CO Investment Adviser LLC trimmed | 101,867 | $419K | 0.1% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. | 62,340 | $415K | 0.1% | 2026-Q1 |
| Knott David M Jr | 99,338 | $408K | 0.1% | 2026-Q1 |
| STATE OF WISCONSIN INVESTMENT BOARD added | 98,285 | $404K | 0.1% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 97,964 | $403K | 0.1% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 91,509 | $376K | 0.1% | 2026-Q1 |
| Caligan Partners LP added | 4,138,943 | $25M | 7.3% | 2025-Q3 stale |
| VANGUARD GROUP INC trimmed | 3,341,804 | $22M | 6.4% | 2025-Q4 stale |
| SOROS FUND MANAGEMENT LLC trimmed | 995,485 | $12M | 3.4% | 2025-Q1 stale |
| Tri Locum Partners LP added | 1,239,031 | $11M | 3.3% | 2025-Q2 stale |
| GREAT POINT PARTNERS LLC trimmed | 720,118 | $7M | 1.9% | 2025-Q2 stale |
| SCHRODER INVESTMENT MANAGEMENT GROUP trimmed | 986,466 | $7M | 1.9% | 2025-Q4 stale |
| LORD, ABBETT & CO. LLC added | 533,599 | $6M | 1.8% | 2025-Q1 stale |
| OBERWEIS ASSET MANAGEMENT INC/ | 677,600 | $6M | 1.8% | 2025-Q2 stale |
| Buckley Capital Advisors, LLC new | 744,242 | $5M | 1.4% | 2025-Q4 stale |
| First Light Asset Management, LLC new | 520,631 | $5M | 1.4% | 2025-Q2 stale |
| EcoR1 Capital, LLC added | 675,000 | $4M | 1.3% | 2025-Q4 stale |
| Altium Capital Management LLC trimmed | 296,193 | $4M | 1.0% | 2025-Q1 stale |
| Jump Financial, LLC added | 355,568 | $3M | 0.9% | 2025-Q2 stale |
| Alyeska Investment Group, L.P. added | 325,000 | $3M | 0.9% | 2025-Q2 stale |
| HRT FINANCIAL LP added | 428,647 | $3M | 0.8% | 2025-Q4 stale |
| JANE STREET GROUP, LLC added | 417,278 | $3M | 0.8% | 2025-Q4 stale |
| Woodline Partners LP added | 393,222 | $2M | 0.7% | 2025-Q3 stale |
| Divisadero Street Capital Management, LP trimmed | 388,231 | $2M | 0.7% | 2025-Q3 stale |
| Ikarian Capital, LLC trimmed | 193,265 | $2M | 0.7% | 2025-Q1 stale |
| Eversept Partners, LP trimmed | 344,104 | $2M | 0.7% | 2025-Q4 stale |
| PANAGORA ASSET MANAGEMENT INC trimmed | 240,735 | $2M | 0.6% | 2025-Q2 stale |
| ESSEX INVESTMENT MANAGEMENT CO LLC trimmed | 181,134 | $2M | 0.6% | 2025-Q1 stale |
| Zimmer Partners, LP trimmed | 330,000 | $2M | 0.6% | 2025-Q3 stale |
| BALYASNY ASSET MANAGEMENT L.P. added | 160,632 | $2M | 0.6% | 2025-Q1 stale |
| FRONTIER CAPITAL MANAGEMENT CO LLC trimmed | 270,506 | $2M | 0.5% | 2025-Q3 stale |
| HighVista Strategies LLC added | 226,025 | $1M | 0.4% | 2025-Q3 stale |
| FIRST MANHATTAN CO. LLC. added | 150,000 | $1M | 0.4% | 2025-Q2 stale |
| RAYMOND JAMES FINANCIAL INC trimmed | 148,500 | $1M | 0.4% | 2025-Q2 stale |
| WELLINGTON MANAGEMENT GROUP LLP added | 195,160 | $1M | 0.4% | 2025-Q4 stale |
| Prospect Capital Advisors, LLC new | 208,100 | $1M | 0.4% | 2025-Q3 stale |
| ADAGE CAPITAL PARTNERS GP, L.L.C. trimmed | 128,400 | $1M | 0.3% | 2025-Q2 stale |
| GILDER GAGNON HOWE & CO LLC trimmed | 120,899 | $1M | 0.3% | 2025-Q2 stale |
| DARK FOREST CAPITAL MANAGEMENT LP trimmed | 119,240 | $1M | 0.3% | 2025-Q2 stale |
| Qube Research & Technologies Ltd trimmed | 177,693 | $1M | 0.3% | 2025-Q3 stale |
| ALGERT GLOBAL LLC added | 77,757 | $935K | 0.3% | 2025-Q1 stale |
| Walleye Capital LLC added | 132,970 | $884K | 0.3% | 2025-Q4 stale |
| Jefferies Financial Group Inc. trimmed | 67,300 | $810K | 0.2% | 2025-Q1 stale |
| GSA CAPITAL PARTNERS LLP added | 118,139 | $786K | 0.2% | 2025-Q4 stale |
| Verition Fund Management LLC added | 84,010 | $774K | 0.2% | 2025-Q2 stale |
| PDT Partners, LLC trimmed | 60,651 | $730K | 0.2% | 2025-Q1 stale |
| UBS AM, A DISTINCT BUSINESS UNIT OF UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 112,966 | $694K | 0.2% | 2025-Q3 stale |
| TWO SIGMA INVESTMENTS, LP added | 102,094 | $679K | 0.2% | 2025-Q4 stale |
| BOOTHBAY FUND MANAGEMENT, LLC trimmed | 101,812 | $677K | 0.2% | 2025-Q4 stale |
| Y-Intercept (Hong Kong) Ltd trimmed | 96,068 | $590K | 0.2% | 2025-Q3 stale |
| Swiss National Bank | 91,700 | $563K | 0.2% | 2025-Q3 stale |
| Allostery Investments LP trimmed | 60,000 | $553K | 0.2% | 2025-Q2 stale |
| Marex Group plc added | 76,850 | $511K | 0.1% | 2025-Q4 stale |
| OCCUDO QUANTITATIVE STRATEGIES LP added | 47,502 | $437K | 0.1% | 2025-Q2 stale |
| Brooklyn Investment Group new | 61,735 | $411K | 0.1% | 2025-Q4 stale |
| PRINCIPAL FINANCIAL GROUP INC added | 33,409 | $402K | 0.1% | 2025-Q1 stale |
| TUDOR INVESTMENT CORP ET AL trimmed | 31,562 | $380K | 0.1% | 2025-Q1 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.