Who owns Cytokinetics (CYTK)
Which tracked institutional funds hold CYTK, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See CYTK 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 CYTK is one-sided between 2026-Q1 and 2026-Q2: 234 added or opened and 67 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
CYTK’s largest tracked holder by dollar value, BlackRock, Inc., 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 CYTK more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in CYTK 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 452 tracked filers holding CYTK, 304 increased or opened the position and 178 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 CYTK 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 39
- Holocene Advisors, LP$98M
- Hood River Capital Management LLC$40M
- Polaris Capital Management, LLC$23M
- Jupiter Topco LLC$21M
- Walleye Capital LLC$20M
- BAKER BROS. ADVISORS LP$18M
Full exits 44
- T. Rowe Price Investment Management, Inc.$1.2B
- Paradigm Biocapital Advisors LP$98M
- Logos Global Management LP$58M
- MPM BIOIMPACT LLC$33M
- GW&K Investment Management, LLC$33M
- GROUP ONE TRADING LLC$24M
Largest adds
- BlackRock, Inc.$770M
- Avoro Capital Advisors LLC$206M
- BANK OF AMERICA CORP /DE/$189M
- VANGUARD PORTFOLIO MANAGEMENT LLC$187M
- STATE STREET CORP$175M
- VANGUARD CAPITAL MANAGEMENT LLC$159M
Largest trims
- FMR LLC$277M
- UBS Group AG$37M
- Deep Track Capital, LP$31M
- Aberdeen Group plc$22M
- CITADEL ADVISORS LLC$18M
- Susquehanna Portfolio Strategies, LLC$17M
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 |
|---|---|---|---|---|
| BlackRock, Inc. added | 20,094,362 | $1.7B | 15.4% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 6,931,770 | $591M | 5.3% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 6,711,799 | $572M | 5.1% | 2026-Q2 |
| STATE STREET CORP added | 6,494,233 | $553M | 5.0% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 6,117,515 | $521M | 4.7% | 2026-Q2 |
| FMR LLC trimmed | 5,031,782 | $429M | 3.9% | 2026-Q2 |
| Avoro Capital Advisors LLC added | 4,999,999 | $426M | 3.8% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 4,635,709 | $395M | 3.6% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 3,712,501 | $316M | 2.8% | 2026-Q2 |
| RTW INVESTMENTS, LP added | 2,862,003 | $244M | 2.2% | 2026-Q2 |
| Polar Capital Holdings Plc added | 2,253,649 | $192M | 1.7% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 1,958,946 | $167M | 1.5% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 1,761,588 | $150M | 1.4% | 2026-Q2 |
| Capital Research Global Investors added | 1,686,625 | $144M | 1.3% | 2026-Q2 |
| NORTHERN TRUST CORP added | 1,647,345 | $140M | 1.3% | 2026-Q2 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC added | 1,603,442 | $137M | 1.2% | 2026-Q2 |
| Integral Health Asset Management, LLC | 1,600,000 | $136M | 1.2% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 1,588,895 | $139M | 1.3% | 2026-Q2 |
| Point72 Asset Management, L.P. added | 1,587,712 | $135M | 1.2% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 1,565,781 | $133M | 1.2% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 1,549,458 | $132M | 1.2% | 2026-Q2 |
| MORGAN STANLEY added | 1,510,318 | $129M | 1.2% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 1,311,664 | $112M | 1.0% | 2026-Q2 |
| Capital International Investors trimmed | 1,305,848 | $111M | 1.0% | 2026-Q2 |
| Invesco Ltd. added | 1,235,323 | $105M | 0.9% | 2026-Q2 |
| ARMISTICE CAPITAL, LLC added | 1,201,342 | $102M | 0.9% | 2026-Q2 |
| UBS Group AG trimmed | 1,171,287 | $100M | 0.9% | 2026-Q2 |
| Pictet Asset Management Holding SA added | 1,160,463 | $99M | 0.9% | 2026-Q2 |
| Frazier Life Sciences Management, L.P. | 1,159,879 | $99M | 0.9% | 2026-Q2 |
| Bank of New York Mellon Corp added | 1,150,697 | $98M | 0.9% | 2026-Q2 |
| Holocene Advisors, LP new | 1,144,579 | $98M | 0.9% | 2026-Q2 |
| Woodline Partners LP added | 1,100,708 | $94M | 0.8% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 1,048,103 | $89M | 0.8% | 2026-Q2 |
| NORGES BANK trimmed | 1,015,522 | $87M | 0.8% | 2026-Q2 |
| Royalty Pharma Sub-Manager, LLC | 980,392 | $84M | 0.8% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. added | 961,815 | $82M | 0.7% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 906,423 | $77M | 0.7% | 2026-Q2 |
| FRANKLIN RESOURCES INC added | 891,087 | $76M | 0.7% | 2026-Q2 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. added | 827,810 | $71M | 0.6% | 2026-Q2 |
| Melqart Asset Management (UK) Ltd trimmed | 767,525 | $65M | 0.6% | 2026-Q2 |
| Siren, L.L.C. added | 758,952 | $65M | 0.6% | 2026-Q2 |
| Fisher Asset Management, LLC trimmed | 743,697 | $63M | 0.6% | 2026-Q2 |
| Foresite Capital Management IV, LLC added | 714,695 | $61M | 0.5% | 2026-Q2 |
| BALYASNY ASSET MANAGEMENT L.P. trimmed | 711,676 | $61M | 0.5% | 2026-Q2 |
| Deep Track Capital, LP trimmed | 700,000 | $60M | 0.5% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 689,077 | $59M | 0.5% | 2026-Q2 |
| Nationale-Nederlanden Powszechne Towarzystwo Emerytalne S.A. | 660,310 | $56M | 0.5% | 2026-Q2 |
| CITADEL ADVISORS LLC trimmed | 640,945 | $55M | 0.5% | 2026-Q2 |
| Qube Research & Technologies Ltd trimmed | 572,535 | $49M | 0.4% | 2026-Q2 |
| BROWN ADVISORY INC trimmed | 570,664 | $49M | 0.4% | 2026-Q2 |
| EVENTIDE ASSET MANAGEMENT, LLC added | 564,398 | $48M | 0.4% | 2026-Q2 |
| Affinity Asset Advisors, LLC trimmed | 550,000 | $47M | 0.4% | 2026-Q2 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ added | 549,348 | $47M | 0.4% | 2026-Q2 |
| FEDERATED HERMES, INC. trimmed | 538,022 | $46M | 0.4% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 535,993 | $35M | 0.3% | 2026-Q2 |
| First Turn Management, LLC added | 527,412 | $45M | 0.4% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 518,398 | $44M | 0.4% | 2026-Q2 |
| Checkpoint Capital L.P. added | 475,000 | $40M | 0.4% | 2026-Q2 |
| Hood River Capital Management LLC added | 469,273 | $40M | 0.4% | 2026-Q2 |
| EMERALD ADVISERS, LLC added | 457,956 | $39M | 0.4% | 2026-Q2 |
| ADAR1 Capital Management, LLC trimmed | 457,907 | $39M | 0.4% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 454,851 | $39M | 0.3% | 2026-Q2 |
| MARSHALL WACE, LLP trimmed | 451,467 | $38M | 0.3% | 2026-Q2 |
| Nuveen, LLC added | 447,185 | $38M | 0.3% | 2026-Q2 |
| Candriam S.C.A. added | 443,066 | $38M | 0.3% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 421,799 | $36M | 0.3% | 2026-Q2 |
| GILDER GAGNON HOWE & CO LLC added | 400,245 | $34M | 0.3% | 2026-Q2 |
| TD Asset Management Inc trimmed | 385,130 | $33M | 0.3% | 2026-Q2 |
| VOYA INVESTMENT MANAGEMENT LLC added | 368,698 | $31M | 0.3% | 2026-Q2 |
| GSK plc | 340,434 | $29M | 0.3% | 2026-Q2 |
| CITIGROUP INC added | 322,932 | $28M | 0.2% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 317,411 | $27M | 0.2% | 2026-Q2 |
| E. Ohman J:or Asset Management AB added | 304,611 | $26M | 0.2% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 301,566 | $26M | 0.2% | 2026-Q2 |
| Trails Edge Capital Partners, LP trimmed | 288,089 | $25M | 0.2% | 2026-Q2 |
| BANK OF MONTREAL /CAN/ added | 285,688 | $24M | 0.2% | 2026-Q2 |
| EMERALD MUTUAL FUND ADVISERS TRUST added | 279,769 | $24M | 0.2% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 273,031 | $23M | 0.2% | 2026-Q2 |
| Polaris Capital Management, LLC new | 266,900 | $23M | 0.2% | 2026-Q2 |
| SEGALL BRYANT & HAMILL, LLC added | 257,063 | $22M | 0.2% | 2026-Q2 |
| Alyeska Investment Group, L.P. added | 250,000 | $21M | 0.2% | 2026-Q2 |
| ExodusPoint Capital Management, LP added | 249,259 | $21M | 0.2% | 2026-Q2 |
| Capital World Investors added | 248,815 | $21M | 0.2% | 2026-Q2 |
| Jupiter Topco LLC new | 244,417 | $21M | 0.2% | 2026-Q2 |
| Walleye Capital LLC added | 239,728 | $20M | 0.2% | 2026-Q2 |
| Sarissa Capital Management LP | 228,623 | $19M | 0.2% | 2026-Q2 |
| Swiss National Bank trimmed | 222,400 | $19M | 0.2% | 2026-Q2 |
| SPHERA FUNDS MANAGEMENT LTD. added | 219,987 | $19M | 0.2% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 216,540 | $18M | 0.2% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC added | 214,535 | $18M | 0.2% | 2026-Q2 |
| BAKER BROS. ADVISORS LP new | 211,267 | $18M | 0.2% | 2026-Q2 |
| California Public Employees Retirement System added | 211,052 | $18M | 0.2% | 2026-Q2 |
| Nicholas Investment Partners, LP added | 209,071 | $18M | 0.2% | 2026-Q2 |
| PINNACLE ASSOCIATES LTD added | 202,440 | $17M | 0.2% | 2026-Q2 |
| Mirador Capital Partners LP trimmed | 202,370 | $17M | 0.2% | 2026-Q2 |
| Tri Locum Partners LP new | 194,000 | $17M | 0.1% | 2026-Q2 |
| PFM Health Sciences, LP trimmed | 191,686 | $16M | 0.1% | 2026-Q2 |
| Rock Springs Capital Management LP added | 187,980 | $16M | 0.1% | 2026-Q2 |
| DAFNA Capital Management LLC trimmed | 171,998 | $15M | 0.1% | 2026-Q2 |
| Ghisallo Capital Management LLC new | 170,000 | $14M | 0.1% | 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.