Alumis Inc. (ALMS) Ownership
ALMS ownership summary
as of October 18, 2026- Institutions
- 93.3% of shares outstanding
- Insiders
- 0.53% of shares outstanding
- Shares outstanding
- 129.4M
- Float
- 91.3M shares available to trade
- Short interest
- 13.26% 10.3M shares short
- Days to cover
- 2.11 short interest up 63.4% vs prior month
- Institutions 93.33%
- Insiders 0.53%
- Other investors 6.14%
ALMS top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 6.35% | 8.2M | $50.3M | +1.0M (+14.6%) | June 30, 2026 |
| 2 | FMR Inc | 5.23% | 6.8M | $41.4M | +5.8M (+595.1%) | June 30, 2026 |
| 3 | Deep Track Capital, LP | 4.90% | 6.3M | $38.9M | −424,037 (−6.3%) | June 30, 2026 |
| 4 | Samsara BioCapital, LLC | 4.90% | 6.3M | $38.8M | — | June 30, 2026 |
| 5 | Foresite Capital Management V, LLC | 4.56% | 5.9M | $36.1M | — | June 30, 2026 |
| 6 | T. Rowe Price Associates, Inc. | 4.02% | 5.2M | $31.8M | +1.9M (+58.2%) | June 30, 2026 |
| 7 | venBio Partners LLC | 3.50% | 4.5M | $27.7M | — | June 30, 2026 |
| 8 | Foresite Capital Management VI LLC | 3.28% | 4.2M | $26.0M | — | June 30, 2026 |
| 9 | Vanguard Capital Management, LLC | 3.26% | 4.2M | $25.8M | +183,437 (+4.5%) | June 30, 2026 |
| 10 | Nextech Invest, Ltd. | 2.74% | 3.5M | $21.7M | — | June 30, 2026 |
| 11 | Cormorant Asset Management, LLC | 2.54% | 3.3M | $20.1M | −663,645 (−16.8%) | June 30, 2026 |
| 12 | Saturn V Capital Management LLC | 2.25% | 2.9M | $17.8M | −286,632 (−9.0%) | June 30, 2026 |
| 13 | Octagon Capital Advisors LP | 2.19% | 2.8M | $17.3M | — | June 30, 2026 |
| 14 | Jupiter Topco LLC | 1.82% | 2.4M | $14.4M | +2.4M (0.0%) | June 30, 2026 |
| 15 | State Street Corp | 1.69% | 2.2M | $13.4M | +385,454 (+21.4%) | June 30, 2026 |
| 16 | Geode Capital Management, LLC | 1.68% | 2.2M | $13.3M | +250,102 (+13.0%) | June 30, 2026 |
| 17 | HHG PLC | 1.64% | 2.1M | $13.0M | +2.1M (0.0%) | March 31, 2026 |
| 18 | MPM Oncology Impact Management LP | 1.56% | 2.0M | $12.4M | −367,509 (−15.4%) | June 30, 2026 |
| 19 | Baker Bros Advisors LP | 1.55% | 2.0M | $12.3M | — | June 30, 2026 |
| 20 | SR ONE CAPITAL MANAGEMENT, LP | 1.51% | 2.0M | $12.0M | — | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 8 holders added 14.1M shares and 4 cut 1.7M.
ALMS top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 2.43% | 3.1M | $19.3M | −4,256 (−0.1%) | August 31, 2026 |
| 2 | iShares Russell 2000 ETF | 1.57% | 2.0M | $12.5M | −23,424 (−1.1%) | September 30, 2026 |
| 3 | HBM Healthcare Investments AG Ord | 1.22% | 1.6M | $9.7M | — | June 30, 2026 |
| 4 | T. Rowe Price New Horizons | 0.96% | 1.2M | $7.6M | −50,978 (−3.9%) | August 31, 2026 |
| 5 | Fidelity Small Cap Growth | 0.85% | 1.1M | $6.8M | +959,490 (+666.4%) | July 31, 2026 |
| 6 | Fidelity Stock Selector Small Cap | 0.85% | 1.1M | $6.8M | +103,200 (+10.3%) | July 31, 2026 |
| 7 | State Street® SPDR® S&P® PhrmctlsETF | 0.82% | 1.1M | $6.5M | −13,206 (−1.2%) | September 30, 2026 |
| 8 | Fidelity Select Health Care | 0.75% | 972K | $5.9M | +31,600 (+3.4%) | August 31, 2026 |
| 9 | T. Rowe Price Integrated US Sm Gr Eq | 0.74% | 956K | $5.8M | — | August 31, 2026 |
| 10 | Fidelity Advisor Biotechnology I | 0.73% | 946K | $5.8M | — | August 31, 2026 |
| 11 | Fidelity Small Cap Index | 0.67% | 864K | $5.3M | +7,422 (+0.9%) | July 31, 2026 |
| 12 | iShares Biotechnology ETF | 0.58% | 752K | $4.6M | −5,696 (−0.8%) | September 30, 2026 |
| 13 | iShares Russell 2000 Growth ETF | 0.57% | 743K | $4.5M | −941 (−0.1%) | September 30, 2026 |
| 14 | JPM Global Healthcare C acc USD | 0.53% | 684K | $4.2M | −9,804 (−1.4%) | August 31, 2026 |
| 15 | Fidelity Series Small Cap Opps | 0.49% | 633K | $3.9M | −51,518 (−7.5%) | July 31, 2026 |
| 16 | Fidelity Select Biotechnology | 0.46% | 597K | $3.7M | — | August 31, 2026 |
| 17 | Fidelity Small Cap Growth K6 | 0.44% | 572K | $3.5M | +497,790 (+666.7%) | July 31, 2026 |
| 18 | T. Rowe Price Health Sciences | 0.42% | 550K | $3.4M | −45,200 (−7.6%) | August 31, 2026 |
| 19 | Janus Henderson Hrzn Biotec E2 USD | 0.41% | 525K | $3.2M | +77,075 (+17.2%) | June 30, 2026 |
| 20 | Schwab US Small-Cap ETF™ | 0.37% | 479K | $2.9M | +324 (+0.1%) | September 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
ALMS insider transactions
latest 20| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-01-09 | Srinivas Akkaraju | Buy | $17.00 | 588,235 | $10.0M |
| 2026-01-08 | Foresite Capital Management Vi | Buy | $17.00 | 411,764 | $7.0M |
| 2026-01-08 | Foresite Labs, Llc | Buy | $17.00 | 411,764 | $7.0M |
| 2026-01-08 | James B Tananbaum | Buy | $17.00 | 411,764 | $7.0M |
| 2025-12-05 | Srinivas Akkaraju | Buy | $9.84 | 186,377 | $1.8M |
| 2025-12-04 | Srinivas Akkaraju | Buy | $8.18 | 66,027 | $540,101 |
| 2025-12-03 | Srinivas Akkaraju | Buy | $7.75 | 100,000 | $775,000 |
| 2025-12-02 | Srinivas Akkaraju | Buy | $7.55 | 96,000 | $724,800 |
| 2025-12-01 | Srinivas Akkaraju | Buy | $7.46 | 86,350 | $644,171 |
| 2025-11-28 | Srinivas Akkaraju | Buy | $7.64 | 38,702 | $295,683 |
| 2025-11-26 | Srinivas Akkaraju | Buy | $7.64 | 48,537 | $370,823 |
| 2025-11-20 | Srinivas Akkaraju | Buy | $7.20 | 125,743 | $905,350 |
| 2025-11-19 | James B Tananbaum | Buy | $6.56 | 190,500 | $1.2M |
| 2025-11-19 | Srinivas Akkaraju | Buy | $6.56 | 137,772 | $903,784 |
| 2025-11-19 | Foresite Labs, Llc | Buy | $6.56 | 190,500 | $1.2M |
| 2025-11-19 | Foresite Capital Management Vi | Buy | $6.56 | 190,500 | $1.2M |
| 2025-11-18 | Foresite Capital Management Vi | Buy | $6.19 | 117,374 | $726,545 |
| 2025-11-18 | Foresite Labs, Llc | Buy | $6.19 | 117,374 | $726,545 |
| 2025-11-18 | James B Tananbaum | Buy | $6.19 | 117,374 | $726,545 |
| 2025-11-18 | Srinivas Akkaraju | Buy | $6.05 | 102,652 | $621,045 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
ALMS shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns ALMS
Institutional investors own 93.3% of Alumis's shares and insiders 0.53%. The largest holder is BlackRock Inc with 6.35% of the shares (8.2M), as of June 30, 2026. Among the top 20 institutions, 8 added shares and 4 reduced their stake in the latest filings. Short interest is 13.26% of the float, or 2.11 days of average trading volume. The share count rose 102.0% since 2023.
Related: ALMS analyst forecast, ALMS key metrics. See the ALMS stock overview for the latest quote and news.
ALMS ownership FAQ
Who owns the most Alumis stock?
The largest shareholders of Alumis are BlackRock Inc (6.35%), FMR Inc (5.23%), Deep Track Capital, LP (4.90%), Samsara BioCapital, LLC (4.90%), Foresite Capital Management V, LLC (4.56%).
What percentage of Alumis is owned by institutions?
Institutions hold 93.3% of Alumis's shares outstanding; insiders hold 0.53%.
Which funds own Alumis?
The largest fund holders of Alumis are Vanguard MStar Total Stk Mkt Idx Invest (2.43%), iShares Russell 2000 ETF (1.57%), HBM Healthcare Investments AG Ord (1.22%), T. Rowe Price New Horizons (0.96%), Fidelity Small Cap Growth (0.85%).
What is Alumis's short interest?
10.3M shares of Alumis were sold short, 13.26% of the float; at the average daily volume it would take 2.11 days to cover.
Are insiders buying or selling Alumis?
Of the latest 20 reported insider transactions in Alumis (since November 18, 2025), 20 were purchases and 0 were sales.
How many shares of Alumis are outstanding?
Alumis has 129.4M shares outstanding, of which 91.3M are in the public float.