Alumis Inc. Common Stock
Alumis Inc. Common Stock (ALMS) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · ALMS · as of Sep 30, 2025
Ownership Breakdown
137
Institutional Holders
▲ 15 vs Q2
$311.21M
Total Inst. Value
▲ $76.22M vs Q2
123.43M
Shares Outstanding
freeFloat 69.57%
78.00M
13F Shares Held
▼ 331,472 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
ALMS largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
AYURMAYA CAPITAL MANAGEMENT COMPANY, LP pharmaceutical preparations | 15.14M | 14.54% | 14.54% | $60.41B | Nov 13, 2025 | ▼ 1 |
FORESITE CAPITAL MANAGEMENT V, LLC pharmaceutical preparations | 5.78M | 5.55% | 5.55% | $23.06B | Nov 14, 2025 | — held |
SAMSARA BIOCAPITAL, LLC pharmaceutical preparations | 4.80M | 4.61% | 4.61% | $19.16B | Nov 14, 2025 | — held |
VENBIO PARTNERS LLC pharmaceutical preparations | 4.62M | 4.44% | 4.44% | $18.43B | Nov 14, 2025 | — held |
FORESITE CAPITAL MANAGEMENT VI LLC pharmaceutical preparations | 4.25M | 4.08% | 4.08% | $16.95B | Nov 14, 2025 | — held |
BLACKROCK, INC. pharmaceutical preparations | 4.19M | 4.03% | 4.03% | $16.73B | Nov 12, 2025 | ▲ 17.4K |
VANGUARD GROUP INC pharmaceutical preparations | 4.03M | 3.87% | 3.87% | $16.08B | Nov 7, 2025 | ▲ 625.4K |
TRIUM CAPITAL LLP pharmaceutical preparations | 3.12M | 3.00% | 3.00% | $12.46B | Oct 16, 2025 | ▲ 474.1K |
NEXTECH INVEST, LTD. pharmaceutical preparations | 2.92M | 2.80% | 2.80% | $11.63B | Nov 14, 2025 | — held |
CORMORANT ASSET MANAGEMENT, LP pharmaceutical preparations | 2.15M | 2.06% | 2.06% | $8.57B | Nov 14, 2025 | — held |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
15
Increased
+3.98M shares4
New Positions
first time holders15
Decreased
−4.25M shares0
Sold Out
fully exitedNet shares change (top 50)
275.2K
+3.98M / −4.25M
Net new holders
+4
4 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
ALMS insider trading · insider activity
Source: SEC Form 4
6
Buy transactions
3
Sell transactions
2.00
Buy/Sell ratio
$3M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Foresite Labs, LLC 10 percent owner | Apr 1, 2026 | J-Other | 1,123,337 | — | — | 1.12M | Form 4 ↗ |
Foresite Labs, LLC 10 percent owner | Apr 1, 2026 | J-Other | 680,486 | — | — | 680.5K | Form 4 ↗ |
Foresite Labs, LLC 10 percent owner | Apr 1, 2026 | J-Other | 1,123,337 | — | — | 0 | Form 4 ↗ |
Foresite Capital Management VI LLC 10 percent owner | Apr 1, 2026 | J-Other | 1,123,337 | — | — | 1.12M | Form 4 ↗ |
Foresite Capital Management VI LLC 10 percent owner | Apr 1, 2026 | J-Other | 680,486 | — | — | 680.5K | Form 4 ↗ |
Foresite Capital Management VI LLC 10 percent owner | Apr 1, 2026 | J-Other | 1,123,337 | — | — | 0 | Form 4 ↗ |
Tananbaum James B.
| Apr 1, 2026 | J-Other | 1,123,337 | — | — | 1.12M | Form 4 ↗ |
Tananbaum James B.
| Apr 1, 2026 | J-Other | 680,486 | — | — | 680.5K | Form 4 ↗ |
Tananbaum James B.
| Apr 1, 2026 | J-Other | 1,123,337 | — | — | 0 | Form 4 ↗ |
Pangali Sanam Chief Legal Officer | Jan 26, 2026 | Award | 186,200 | $26.31 | $4.90M | 186.2K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Alumis Inc. Common Stock (ALMS) is primarily owned by institutional investors, who hold approximately 63.2% of total shares outstanding. Company insiders own approximately 30.43%, while retail and public investors account for the remaining 6.38%.
The largest institutional shareholder of Alumis Inc. Common Stock is AYURMAYA CAPITAL MANAGEMENT COMPANY, LP, holding approximately 15.14 million shares — equal to 14.54% of outstanding shares — as of September 30, 2025.
A total of 137 institutional investors currently hold ALMS stock, with a combined institutional value of approximately $311,209,489 as of the most recent 13F filing period.
Frequently asked questions
ALMS ownershipAlumis Inc. Common Stock (ALMS) is primarily owned by institutional investors, who hold approximately 63.2% of shares. The largest shareholder is AYURMAYA CAPITAL MANAGEMENT COMPANY, LP with a 14.54% stake. Company insiders hold 30.43%. Data sourced from SEC Form 13F as of September 30, 2025.