Who owns Arcus Biosciences (RCUS)
Which tracked institutional funds hold RCUS, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See RCUS 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 RCUS is one-sided between 2026-Q1 and 2026-Q2: 102 added or opened and 29 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
RCUS’s largest tracked holder by dollar value, GILEAD SCIENCES, INC., sizes it at 58.8% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 58.8pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in RCUS 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 210 tracked filers holding RCUS, 121 increased or opened the position and 100 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 RCUS 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 13
- Ikarian Capital, LLC$16M
- BOOTHBAY FUND MANAGEMENT, LLC$5M
- PFM Health Sciences, LP$5M
- MILLENNIUM MANAGEMENT LLC$4M
- Odyssean, LLC$3M
- FRED ALGER MANAGEMENT, LLC$2M
Full exits 17
- Trails Edge Capital Partners, LP$23M
- RENAISSANCE TECHNOLOGIES LLC$9M
- TUDOR INVESTMENT CORP ET AL$5M
- Point72 Asset Management, L.P.$3M
- JANE STREET GROUP, LLC$2M
- NEW YORK STATE TEACHERS RETIREMENT SYSTEM$2M
Largest adds
- BlackRock, Inc.$297M
- GILEAD SCIENCES, INC.$290M
- FMR LLC$100M
- STATE STREET CORP$69M
- CITADEL ADVISORS LLC$68M
- WELLINGTON MANAGEMENT GROUP LLP$52M
Largest trims
- MARSHALL WACE, LLP$21M
- Logos Global Management LP$6M
- Susquehanna Portfolio Strategies, LLC$4M
- BNP PARIBAS FINANCIAL MARKETS$4M
- Hudson Bay Capital Management LP$3M
- SUSQUEHANNA INTERNATIONAL GROUP, LLP$3M
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 |
|---|---|---|---|---|
| GILEAD SCIENCES, INC. | 31,424,760 | $969M | 26.1% | 2026-Q2 |
| BlackRock, Inc. added | 16,416,249 | $506M | 13.6% | 2026-Q2 |
| STATE STREET CORP added | 6,029,484 | $186M | 5.0% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 5,895,448 | $182M | 4.9% | 2026-Q2 |
| MONTANOVA CAPITAL, LLC trimmed | 4,776,423 | $147M | 4.0% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 4,475,528 | $138M | 3.7% | 2026-Q2 |
| FMR LLC added | 4,049,757 | $125M | 3.4% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 3,888,346 | $120M | 3.2% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 3,135,057 | $97M | 2.6% | 2026-Q2 |
| Woodline Partners LP trimmed | 3,007,798 | $93M | 2.5% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 2,448,749 | $76M | 2.0% | 2026-Q2 |
| Siren, L.L.C. trimmed | 2,420,430 | $75M | 2.0% | 2026-Q2 |
| Fisher Asset Management, LLC trimmed | 2,139,396 | $66M | 1.8% | 2026-Q2 |
| MARSHALL WACE, LLP trimmed | 1,945,088 | $60M | 1.6% | 2026-Q2 |
| SAMLYN CAPITAL, LLC trimmed | 1,547,182 | $48M | 1.3% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 1,434,320 | $44M | 1.2% | 2026-Q2 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. trimmed | 1,419,533 | $44M | 1.2% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 1,387,566 | $43M | 1.2% | 2026-Q2 |
| Soleus Capital Management, L.P. added | 1,168,738 | $36M | 1.0% | 2026-Q2 |
| Sofinnova Investments, Inc. added | 945,690 | $29M | 0.8% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 941,756 | $29M | 0.8% | 2026-Q2 |
| NORTHERN TRUST CORP added | 932,523 | $29M | 0.8% | 2026-Q2 |
| Parkman Healthcare Partners LLC trimmed | 919,266 | $28M | 0.8% | 2026-Q2 |
| Invesco Ltd. added | 845,233 | $26M | 0.7% | 2026-Q2 |
| BAKER BROS. ADVISORS LP added | 844,816 | $26M | 0.7% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 835,504 | $26M | 0.7% | 2026-Q2 |
| MORGAN STANLEY trimmed | 795,912 | $25M | 0.7% | 2026-Q2 |
| Candriam S.C.A. trimmed | 661,981 | $20M | 0.5% | 2026-Q2 |
| Aberdeen Group plc trimmed | 650,712 | $20M | 0.5% | 2026-Q2 |
| Logos Global Management LP trimmed | 650,000 | $20M | 0.5% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 635,404 | $20M | 0.5% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 616,088 | $19M | 0.5% | 2026-Q2 |
| Bank of New York Mellon Corp added | 543,009 | $17M | 0.5% | 2026-Q2 |
| JACOBS LEVY EQUITY MANAGEMENT, INC added | 512,084 | $16M | 0.4% | 2026-Q2 |
| Ikarian Capital, LLC added | 504,559 | $16M | 0.4% | 2026-Q2 |
| Decheng Capital LLC trimmed | 464,779 | $14M | 0.4% | 2026-Q2 |
| DAFNA Capital Management LLC trimmed | 441,829 | $14M | 0.4% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 423,366 | $13M | 0.4% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 418,243 | $13M | 0.4% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 379,100 | $12M | 0.3% | 2026-Q2 |
| UBS Group AG added | 369,056 | $11M | 0.3% | 2026-Q2 |
| Patient Square Capital LP added | 355,800 | $11M | 0.3% | 2026-Q2 |
| PDT Partners, LLC trimmed | 323,567 | $10M | 0.3% | 2026-Q2 |
| Public Sector Pension Investment Board trimmed | 298,156 | $9M | 0.2% | 2026-Q2 |
| FIRST TRUST ADVISORS LP added | 271,434 | $8M | 0.2% | 2026-Q2 |
| Nuveen, LLC added | 234,052 | $7M | 0.2% | 2026-Q2 |
| Connor, Clark & Lunn Investment Management Ltd. trimmed | 225,008 | $7M | 0.2% | 2026-Q2 |
| DIADEMA PARTNERS LP trimmed | 223,810 | $7M | 0.2% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 219,181 | $7M | 0.2% | 2026-Q2 |
| Ensign Peak Advisors, Inc trimmed | 215,613 | $7M | 0.2% | 2026-Q2 |
| Legal & General Group Plc added | 191,560 | $6M | 0.2% | 2026-Q2 |
| Rock Springs Capital Management LP | 180,000 | $6M | 0.1% | 2026-Q2 |
| Swiss National Bank added | 176,096 | $5M | 0.1% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 154,398 | $5M | 0.1% | 2026-Q2 |
| BOOTHBAY FUND MANAGEMENT, LLC added | 154,264 | $5M | 0.1% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC trimmed | 153,813 | $5M | 0.1% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 153,109 | $5M | 0.1% | 2026-Q2 |
| PFM Health Sciences, LP new | 152,129 | $5M | 0.1% | 2026-Q2 |
| Hudson Bay Capital Management LP trimmed | 140,000 | $4M | 0.1% | 2026-Q2 |
| Man Group plc added | 137,763 | $4M | 0.1% | 2026-Q2 |
| PLATINUM INVESTMENT MANAGEMENT LTD | 134,217 | $4M | 0.1% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 133,110 | $4M | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 126,975 | $3M | 0.1% | 2026-Q2 |
| Schonfeld Strategic Advisors LLC trimmed | 122,574 | $4M | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 112,238 | $3M | 0.1% | 2026-Q2 |
| SECTORAL ASSET MANAGEMENT INC added | 110,870 | $3M | 0.1% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC added | 110,603 | $3M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 97,410 | $3M | 0.1% | 2026-Q2 |
| D. E. Shaw & Co., Inc. trimmed | 96,417 | $3M | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 94,710 | $3M | 0.1% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 89,202 | $3M | 0.1% | 2026-Q2 |
| Parallel Advisors, LLC | 86,557 | $3M | 0.1% | 2026-Q2 |
| Odyssean, LLC new | 85,497 | $3M | 0.1% | 2026-Q2 |
| Tidal Investments LLC trimmed | 85,126 | $3M | 0.1% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 83,861 | $3M | 0.1% | 2026-Q2 |
| Tema ETFs LLC added | 83,140 | $3M | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 82,913 | $3M | 0.1% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD added | 82,399 | $3M | 0.1% | 2026-Q2 |
| Jump Financial, LLC trimmed | 82,036 | $3M | 0.1% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 81,549 | $3M | 0.1% | 2026-Q2 |
| Knott David M Jr | 81,241 | $3M | 0.1% | 2026-Q2 |
| Rafferty Asset Management, LLC trimmed | 71,725 | $2M | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 63,528 | $2M | 0.1% | 2026-Q2 |
| Caption Management, LLC added | 62,000 | $2M | 0.1% | 2026-Q2 |
| FRED ALGER MANAGEMENT, LLC added | 60,494 | $2M | 0.1% | 2026-Q2 |
| BIT Capital GmbH new | 60,000 | $2M | 0.0% | 2026-Q2 |
| Corient Private Wealth LP added | 59,134 | $2M | 0.0% | 2026-Q2 |
| Zurcher Kantonalbank (Zurich Cantonalbank) added | 59,021 | $2M | 0.0% | 2026-Q2 |
| Quantinno Capital Management LP added | 57,255 | $2M | 0.0% | 2026-Q2 |
| Persistent Asset Partners Ltd trimmed | 57,048 | $2M | 0.0% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC added | 53,680 | $2M | 0.0% | 2026-Q2 |
| Susquehanna Portfolio Strategies, LLC trimmed | 53,668 | $2M | 0.0% | 2026-Q2 |
| WINTON GROUP Ltd added | 52,398 | $2M | 0.0% | 2026-Q2 |
| MetLife Investment Management, LLC added | 52,110 | $2M | 0.0% | 2026-Q2 |
| Illinois Municipal Retirement Fund added | 51,214 | $2M | 0.0% | 2026-Q2 |
| SummitTX Capital, L.P. added | 50,463 | $2M | 0.0% | 2026-Q2 |
| Burkehill Global Management, LP | 50,000 | $2M | 0.0% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 49,526 | $2M | 0.0% | 2026-Q2 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE added | 45,826 | $1M | 0.0% | 2026-Q2 |
| Jupiter Topco LLC new | 42,338 | $1M | 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.