Who owns Alumis Inc. Common Stock (ALMS)
Which tracked institutional funds hold ALMS, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See ALMS 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
87 tracked funds added or opened ALMS while 35 trimmed or exited it between 2026-Q1 and 2026-Q2 — 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
ALMS’s largest tracked holder by dollar value, AyurMaya Capital Management Company, LP, sizes it at 100.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 100.0pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in ALMS 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 193 tracked filers holding ALMS, 102 increased or opened the position and 92 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 ALMS 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 10
- Jupiter Topco LLC$66M
- NOVO HOLDINGS A/S$31M
- Woodline Partners LP$14M
- NOMURA ASSET MANAGEMENT INTERNATIONAL INC.$4M
- FRED ALGER MANAGEMENT, LLC$1M
- Trexquant Investment LP$961K
Full exits 14
- JANUS HENDERSON GROUP PLC$46M
- Point72 Asset Management, L.P.$8M
- CITADEL ADVISORS LLC$6M
- ExodusPoint Capital Management, LP$6M
- Hudson Bay Capital Management LP$4M
- Burkehill Global Management, LP$4M
Largest adds
- FMR LLC$169M
- AyurMaya Capital Management Company, LP$93M
- PRICE T ROWE ASSOCIATES INC /MD/$74M
- BlackRock, Inc.$73M
- SAMSARA BIOCAPITAL, LLC$39M
- Foresite Capital Management V, LLC$36M
Largest trims
- UBS Group AG$41M
- MARSHALL WACE, LLP$15M
- Weiss Asset Management LP$15M
- Yu Fan$10M
- VOLORIDGE INVESTMENT MANAGEMENT, LLC$7M
- PRUDENTIAL FINANCIAL INC$7M
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 |
|---|---|---|---|---|
| AyurMaya Capital Management Company, LP | 15,139,707 | $426M | 12.9% | 2026-Q2 |
| BlackRock, Inc. added | 8,218,151 | $231M | 7.0% | 2026-Q2 |
| FMR LLC added | 6,769,170 | $190M | 5.8% | 2026-Q2 |
| Deep Track Capital, LP trimmed | 6,348,558 | $179M | 5.4% | 2026-Q2 |
| SAMSARA BIOCAPITAL, LLC | 6,345,219 | $179M | 5.4% | 2026-Q2 |
| Foresite Capital Management V, LLC | 5,896,995 | $166M | 5.0% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 5,199,838 | $146M | 4.4% | 2026-Q2 |
| venBio Partners LLC | 4,528,408 | $127M | 3.9% | 2026-Q2 |
| Foresite Capital Management VI LLC | 4,247,670 | $120M | 3.6% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 4,215,703 | $119M | 3.6% | 2026-Q2 |
| Nextech Invest Ltd. | 3,540,998 | $100M | 3.0% | 2026-Q2 |
| Cormorant Asset Management, LP trimmed | 3,285,596 | $92M | 2.8% | 2026-Q2 |
| Saturn V Capital Management LP trimmed | 2,915,443 | $82M | 2.5% | 2026-Q2 |
| Octagon Capital Advisors LP | 2,830,700 | $80M | 2.4% | 2026-Q2 |
| Jupiter Topco LLC new | 2,355,122 | $66M | 2.0% | 2026-Q2 |
| STATE STREET CORP added | 2,187,266 | $62M | 1.9% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 2,168,517 | $61M | 1.9% | 2026-Q2 |
| MPM BIOIMPACT LLC trimmed | 2,019,020 | $57M | 1.7% | 2026-Q2 |
| BAKER BROS. ADVISORS LP | 2,012,500 | $57M | 1.7% | 2026-Q2 |
| SR One Capital Management, LP | 1,959,896 | $55M | 1.7% | 2026-Q2 |
| Invesco Ltd. trimmed | 1,173,518 | $33M | 1.0% | 2026-Q2 |
| NOVO HOLDINGS A/S new | 1,100,000 | $31M | 0.9% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 1,068,060 | $30M | 0.9% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 969,617 | $26M | 0.8% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 968,234 | $27M | 0.8% | 2026-Q2 |
| UBS Group AG trimmed | 951,796 | $27M | 0.8% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 921,211 | $26M | 0.8% | 2026-Q2 |
| Ikarian Capital, LLC trimmed | 870,548 | $24M | 0.7% | 2026-Q2 |
| GREAT POINT PARTNERS LLC | 856,061 | $24M | 0.7% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 831,897 | $23M | 0.7% | 2026-Q2 |
| NORTHERN TRUST CORP added | 723,849 | $20M | 0.6% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 700,134 | $20M | 0.6% | 2026-Q2 |
| Integral Health Asset Management, LLC trimmed | 700,000 | $20M | 0.6% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 660,142 | $19M | 0.6% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 612,010 | $17M | 0.5% | 2026-Q2 |
| Opaleye Management Inc. | 550,000 | $15M | 0.5% | 2026-Q2 |
| ORBIMED ADVISORS LLC | 548,163 | $15M | 0.5% | 2026-Q2 |
| ROYCE & ASSOCIATES LP added | 525,303 | $15M | 0.4% | 2026-Q2 |
| Woodline Partners LP trimmed | 486,052 | $14M | 0.4% | 2026-Q2 |
| Spruce Street Capital LP | 392,574 | $11M | 0.3% | 2026-Q2 |
| Trium Capital LLP added | 390,268 | $11M | 0.3% | 2026-Q2 |
| CITIGROUP INC added | 385,400 | $11M | 0.3% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP trimmed | 376,119 | $11M | 0.3% | 2026-Q2 |
| MARSHALL WACE, LLP trimmed | 368,014 | $10M | 0.3% | 2026-Q2 |
| MORGAN STANLEY added | 321,163 | $9M | 0.3% | 2026-Q2 |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC trimmed | 320,861 | $9M | 0.3% | 2026-Q2 |
| Weiss Asset Management LP trimmed | 311,371 | $9M | 0.3% | 2026-Q2 |
| Artia Global Partners LP trimmed | 278,546 | $8M | 0.2% | 2026-Q2 |
| BARCLAYS PLC added | 273,716 | $8M | 0.2% | 2026-Q2 |
| Yu Fan trimmed | 252,672 | $7M | 0.2% | 2026-Q2 |
| Nuveen, LLC trimmed | 243,872 | $7M | 0.2% | 2026-Q2 |
| BOOTHBAY FUND MANAGEMENT, LLC trimmed | 242,538 | $7M | 0.2% | 2026-Q2 |
| Omega Fund Management, LLC | 241,255 | $7M | 0.2% | 2026-Q2 |
| SCHRODER INVESTMENT MANAGEMENT GROUP added | 236,841 | $6M | 0.2% | 2026-Q2 |
| Bank of New York Mellon Corp added | 226,618 | $6M | 0.2% | 2026-Q2 |
| TOWERVIEW LLC | 222,294 | $6M | 0.2% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 207,789 | $6M | 0.2% | 2026-Q2 |
| Exome Asset Management LLC trimmed | 204,418 | $6M | 0.2% | 2026-Q2 |
| HighVista Strategies LLC added | 199,968 | $6M | 0.2% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 179,802 | $5M | 0.2% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 174,912 | $5M | 0.1% | 2026-Q2 |
| Susquehanna Portfolio Strategies, LLC | 172,779 | $5M | 0.1% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC trimmed | 162,583 | $5M | 0.1% | 2026-Q2 |
| Russell Investments Group, Ltd. trimmed | 153,906 | $4M | 0.1% | 2026-Q2 |
| Ensign Peak Advisors, Inc trimmed | 146,970 | $4M | 0.1% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 146,437 | $4M | 0.1% | 2026-Q2 |
| VOYA INVESTMENT MANAGEMENT LLC added | 138,418 | $4M | 0.1% | 2026-Q2 |
| MOORE CAPITAL MANAGEMENT, LP added | 136,803 | $4M | 0.1% | 2026-Q2 |
| Swiss National Bank added | 135,900 | $4M | 0.1% | 2026-Q2 |
| STEMPOINT CAPITAL LP trimmed | 135,736 | $4M | 0.1% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. new | 134,850 | $4M | 0.1% | 2026-Q2 |
| VICTORY CAPITAL MANAGEMENT INC added | 132,331 | $4M | 0.1% | 2026-Q2 |
| Quantinno Capital Management LP added | 131,092 | $4M | 0.1% | 2026-Q2 |
| Elmind Capital, LP | 130,000 | $4M | 0.1% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 112,129 | $3M | 0.1% | 2026-Q2 |
| STIFEL FINANCIAL CORP trimmed | 110,075 | $3M | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 104,394 | $2M | 0.1% | 2026-Q2 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE trimmed | 100,215 | $3M | 0.1% | 2026-Q2 |
| Ghisallo Capital Management LLC | 100,000 | $3M | 0.1% | 2026-Q2 |
| TD Asset Management Inc trimmed | 97,002 | $3M | 0.1% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 96,767 | $3M | 0.1% | 2026-Q2 |
| FIRST TRUST ADVISORS LP added | 94,046 | $3M | 0.1% | 2026-Q2 |
| Harvest Investment Services, LLC trimmed | 92,765 | $3M | 0.1% | 2026-Q2 |
| Caption Management, LLC added | 90,000 | $3M | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 84,113 | $2M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 78,818 | $2M | 0.1% | 2026-Q2 |
| Ally Bridge Group (NY) LLC trimmed | 76,459 | $2M | 0.1% | 2026-Q2 |
| Mariner, LLC trimmed | 71,726 | $2M | 0.1% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 58,717 | $2M | 0.1% | 2026-Q2 |
| ALGERT GLOBAL LLC trimmed | 57,770 | $2M | 0.0% | 2026-Q2 |
| Legal & General Group Plc added | 54,930 | $2M | 0.0% | 2026-Q2 |
| ACT CAPITAL MANAGEMENT, LLC trimmed | 51,600 | $1M | 0.0% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 50,615 | $1M | 0.0% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD added | 50,413 | $1M | 0.0% | 2026-Q2 |
| Vanguard Global Advisers, LLC added | 49,756 | $1M | 0.0% | 2026-Q2 |
| Squarepoint Ops LLC trimmed | 47,590 | $1M | 0.0% | 2026-Q2 |
| MetLife Investment Management, LLC added | 46,312 | $1M | 0.0% | 2026-Q2 |
| FRED ALGER MANAGEMENT, LLC new | 43,057 | $1M | 0.0% | 2026-Q2 |
| Creative Planning added | 41,818 | $1M | 0.0% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 36,373 | $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.