Who owns SRRK (SRRK)
Which tracked institutional funds hold SRRK, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See SRRK 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
110 tracked funds added or opened SRRK while 43 trimmed or exited it between 2025-Q4 and 2026-Q1 — 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
SRRK’s largest tracked holder by dollar value, FMR LLC, sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.1% of theirs — a 0.0pp gap the other way — the median holder sizes SRRK more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in SRRK 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 278 tracked filers holding SRRK, 156 increased or opened the position and 119 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 SRRK 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 21
- VANGUARD CAPITAL MANAGEMENT LLC$191M
- VANGUARD PORTFOLIO MANAGEMENT LLC$35M
- ADAGE CAPITAL PARTNERS GP, L.L.C.$34M
- VANGUARD FIDUCIARY TRUST CO$29M
- SILVERARC CAPITAL MANAGEMENT, LLC$17M
- Cinctive Capital Management LP$8M
Full exits 12
- VANGUARD GROUP INC$224M
- Nationale-Nederlanden Powszechne Towarzystwo Emerytalne S.A.$34M
- PICTON MAHONEY ASSET MANAGEMENT$3M
- READYSTATE ASSET MANAGEMENT LP$2M
- Longaeva Partners L.P.$1M
- EXCHANGE TRADED CONCEPTS, LLC$857K
Largest adds
- Redmile Group, LLC$216M
- FMR LLC$161M
- WELLINGTON MANAGEMENT GROUP LLP$74M
- Siren, L.L.C.$55M
- Orbis Allan Gray Ltd$54M
- JENNISON ASSOCIATES LLC$41M
Largest trims
- BlackRock, Inc.$133M
- Paradigm Biocapital Advisors LP$75M
- NORGES BANK$39M
- Pictet Asset Management Holding SA$10M
- TWO SIGMA INVESTMENTS, LP$9M
- BARCLAYS PLC$9M
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 |
|---|---|---|---|---|
| FMR LLC added | 17,056,967 | $839M | 12.5% | 2026-Q1 |
| Siren, L.L.C. | 10,825,013 | $532M | 7.9% | 2026-Q1 |
| Redmile Group, LLC added | 9,066,621 | $446M | 6.6% | 2026-Q1 |
| SAMSARA BIOCAPITAL, LLC | 6,897,652 | $339M | 5.0% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP added | 6,675,296 | $328M | 4.9% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 6,206,618 | $305M | 4.5% | 2026-Q1 |
| Orbis Allan Gray Ltd added | 4,179,983 | $205M | 3.1% | 2026-Q1 |
| STATE STREET CORP trimmed | 4,031,317 | $198M | 2.9% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 3,891,347 | $191M | 2.8% | 2026-Q1 |
| BlackRock, Inc. trimmed | 3,762,557 | $185M | 2.7% | 2026-Q1 |
| Bellevue Group AG trimmed | 3,584,573 | $176M | 2.6% | 2026-Q1 |
| JENNISON ASSOCIATES LLC added | 3,340,492 | $164M | 2.4% | 2026-Q1 |
| JANUS HENDERSON GROUP PLC added | 2,236,837 | $110M | 1.6% | 2026-Q1 |
| EVENTIDE ASSET MANAGEMENT, LLC trimmed | 2,197,385 | $108M | 1.6% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 2,149,036 | $106M | 1.6% | 2026-Q1 |
| Hood River Capital Management LLC added | 2,049,679 | $101M | 1.5% | 2026-Q1 |
| Polar Capital Holdings Plc added | 1,983,628 | $98M | 1.4% | 2026-Q1 |
| Driehaus Capital Management LLC trimmed | 1,920,233 | $94M | 1.4% | 2026-Q1 |
| Holocene Advisors, LP added | 1,890,927 | $93M | 1.4% | 2026-Q1 |
| Woodline Partners LP added | 1,500,470 | $74M | 1.1% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 1,398,983 | $69M | 1.0% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 1,336,632 | $66M | 1.0% | 2026-Q1 |
| Vestal Point Capital, LP added | 1,324,422 | $65M | 1.0% | 2026-Q1 |
| Paradigm Biocapital Advisors LP trimmed | 1,226,080 | $60M | 0.9% | 2026-Q1 |
| Capital World Investors | 1,128,752 | $55M | 0.8% | 2026-Q1 |
| NORGES BANK trimmed | 1,633,422 | $53M | 0.8% | 2026-Q1 |
| MARSHALL WACE, LLP added | 1,060,275 | $52M | 0.8% | 2026-Q1 |
| STEMPOINT CAPITAL LP added | 1,035,496 | $51M | 0.8% | 2026-Q1 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. added | 981,915 | $48M | 0.7% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 900,799 | $44M | 0.7% | 2026-Q1 |
| Pictet Asset Management Holding SA trimmed | 875,084 | $43M | 0.6% | 2026-Q1 |
| FEDERATED HERMES, INC. | 797,913 | $39M | 0.6% | 2026-Q1 |
| NORTHERN TRUST CORP added | 763,803 | $38M | 0.6% | 2026-Q1 |
| Rock Springs Capital Management LP added | 739,816 | $36M | 0.5% | 2026-Q1 |
| VOYA INVESTMENT MANAGEMENT LLC added | 725,409 | $36M | 0.5% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 723,875 | $36M | 0.5% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 721,744 | $35M | 0.5% | 2026-Q1 |
| Ensign Peak Advisors, Inc trimmed | 717,253 | $35M | 0.5% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC trimmed | 707,101 | $35M | 0.5% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 701,011 | $34M | 0.5% | 2026-Q1 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. trimmed | 700,000 | $34M | 0.5% | 2026-Q1 |
| Clearbridge Investments, LLC added | 691,418 | $34M | 0.5% | 2026-Q1 |
| UBS Group AG trimmed | 679,784 | $33M | 0.5% | 2026-Q1 |
| LOOMIS SAYLES & CO L P trimmed | 638,629 | $31M | 0.5% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 589,048 | $29M | 0.4% | 2026-Q1 |
| Nuveen, LLC trimmed | 581,654 | $29M | 0.4% | 2026-Q1 |
| JANE STREET GROUP, LLC added | 560,084 | $28M | 0.4% | 2026-Q1 |
| Integral Health Asset Management, LLC added | 500,000 | $25M | 0.4% | 2026-Q1 |
| Eagle Health Investments LP added | 494,019 | $24M | 0.4% | 2026-Q1 |
| Fisher Asset Management, LLC trimmed | 458,017 | $23M | 0.3% | 2026-Q1 |
| First Turn Management, LLC trimmed | 446,390 | $22M | 0.3% | 2026-Q1 |
| ADAR1 Capital Management, LLC added | 407,273 | $20M | 0.3% | 2026-Q1 |
| Casdin Capital, LLC added | 350,000 | $17M | 0.3% | 2026-Q1 |
| SILVERARC CAPITAL MANAGEMENT, LLC added | 339,613 | $17M | 0.2% | 2026-Q1 |
| ARMISTICE CAPITAL, LLC added | 336,959 | $17M | 0.2% | 2026-Q1 |
| NAN FUNG TRINITY (HK) LTD added | 285,495 | $14M | 0.2% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC added | 253,599 | $12M | 0.2% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 241,794 | $12M | 0.2% | 2026-Q1 |
| Bank of New York Mellon Corp added | 232,672 | $11M | 0.2% | 2026-Q1 |
| Candriam S.C.A. added | 225,998 | $11M | 0.2% | 2026-Q1 |
| TD Asset Management Inc trimmed | 223,064 | $11M | 0.2% | 2026-Q1 |
| MORGAN STANLEY trimmed | 219,027 | $11M | 0.2% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 209,844 | $10M | 0.2% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP trimmed | 178,672 | $9M | 0.1% | 2026-Q1 |
| Universal- Beteiligungs- und Servicegesellschaft mbH added | 177,377 | $9M | 0.1% | 2026-Q1 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE trimmed | 173,765 | $9M | 0.1% | 2026-Q1 |
| Cinctive Capital Management LP added | 172,535 | $8M | 0.1% | 2026-Q1 |
| Granahan Investment Management, LLC added | 156,314 | $8M | 0.1% | 2026-Q1 |
| JPMORGAN CHASE & CO added | 174,419 | $8M | 0.1% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. added | 149,714 | $7M | 0.1% | 2026-Q1 |
| PEREGRINE CAPITAL MANAGEMENT LLC trimmed | 146,606 | $7M | 0.1% | 2026-Q1 |
| SEI INVESTMENTS CO added | 143,359 | $7M | 0.1% | 2026-Q1 |
| GordonMD Global Investments LP new | 132,500 | $7M | 0.1% | 2026-Q1 |
| iA Global Asset Management Inc. trimmed | 123,212 | $6M | 0.1% | 2026-Q1 |
| Swiss National Bank | 123,200 | $6M | 0.1% | 2026-Q1 |
| Invesco Ltd. added | 119,597 | $6M | 0.1% | 2026-Q1 |
| EFG International AG trimmed | 112,730 | $6M | 0.1% | 2026-Q1 |
| RHUMBLINE ADVISERS added | 112,501 | $6M | 0.1% | 2026-Q1 |
| Rafferty Asset Management, LLC trimmed | 104,456 | $5M | 0.1% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 102,912 | $5M | 0.1% | 2026-Q1 |
| XTX Topco Ltd added | 100,425 | $5M | 0.1% | 2026-Q1 |
| FIDEURAM - INTESA SANPAOLO PRIVATE BANKING S.P.A. trimmed | 98,700 | $5M | 0.1% | 2026-Q1 |
| Artia Global Partners LP | 96,285 | $5M | 0.1% | 2026-Q1 |
| SPHERA FUNDS MANAGEMENT LTD. trimmed | 94,265 | $5M | 0.1% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. added | 100,690 | $4M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC added | 5,088,195 | $224M | 3.3% | 2025-Q4 stale |
| Fairmount Funds Management LLC | 1,824,031 | $68M | 1.0% | 2025-Q3 stale |
| Commodore Capital LP trimmed | 1,450,000 | $51M | 0.8% | 2025-Q2 stale |
| RA CAPITAL MANAGEMENT, L.P. added | 1,166,788 | $43M | 0.6% | 2025-Q3 stale |
| Nationale-Nederlanden Powszechne Towarzystwo Emerytalne S.A. | 769,442 | $34M | 0.5% | 2025-Q4 stale |
| Octagon Capital Advisors LP added | 7,900,000 | $14M | 0.2% | 2025-Q1 stale |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 291,200 | $10M | 0.2% | 2025-Q2 stale |
| Logos Global Management LP trimmed | 175,000 | $7M | 0.1% | 2025-Q3 stale |
| Caption Management, LLC added | 153,702 | $6M | 0.1% | 2025-Q3 stale |
| LORD, ABBETT & CO. LLC trimmed | 147,671 | $5M | 0.1% | 2025-Q3 stale |
| Patient Square Capital LP | 154,000 | $5M | 0.1% | 2025-Q2 stale |
| TWINBEECH CAPITAL LP added | 159,713 | $5M | 0.1% | 2025-Q1 stale |
| AXA Investment Managers S.A. new | 132,570 | $5M | 0.1% | 2025-Q3 stale |
| ORBIMED ADVISORS LLC | 151,800 | $5M | 0.1% | 2025-Q1 stale |
| Soleus Capital Management, L.P. trimmed | 125,000 | $4M | 0.1% | 2025-Q2 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.