Samsara BioCapital, LLC: ALUMIS INC (ALMS): Quarterly 13F Position History
As of Q1 2026, Samsara BioCapital, LLC reported 6,345,219 shares of ALUMIS INC (ALMS), worth $139.8M and representing 13.6% of its 13F equity book. Quarter-over-quarter share count change: + 588,235 (+10.2%) . The position first appeared in Q3 2024 and has been disclosed across 7 13F-HR filings in Pactolio's tracked window.
- 6,345,219Shares Held (Latest Filing)
- $139.8MReported Market Value (Latest Filing)
- 13.6%Portfolio Weight (% of 13F Equity Book)
- +588,235Quarter-over-Quarter Share Change
- +$83.6MQuarter-over-Quarter Value Change
- 6,345,219Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 7 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 6,345,219 | +588,235 | +10.2% | $139.8M | 13.6% | $22.0 |
| Q4 2025 | 5,756,984 | +955,614 | +19.9% | $56.2M | 5.8% | $9.8 |
| Q3 2025 | 4,801,370 | 0 | — | $19.2M | 2.5% | $4.0 |
| Q2 2025 | 4,801,370 | +1,534,872 | +47.0% | $14.4M | 2.9% | $3.0 |
| Q1 2025 | 3,266,498 | 0 | — | $20.1M | 3.6% | $6.1 |
| Q4 2024 | 3,266,498 | 0 | — | $25.7M | 3.5% | $7.9 |
| Q3 2024 | 3,266,498 | — | — | $34.9M | 6.7% | $10.7 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares — a quarter-end mark, not the manager's cost basis. See the full methodology document for the normalization rules.
When did Samsara BioCapital, LLC first disclose a ALMS position in 13F-HR filings?
Samsara BioCapital, LLC first reported ALUMIS INC (ALMS) on its 13F-HR filing for the period ending 2024-09-30 (Q3 2024). The position has appeared on 7 reported quarters within Pactolio's tracked window.
What was Samsara BioCapital, LLC's most recent quarter-over-quarter share-count change in ALMS?
Between Q4 2025 and Q1 2026, Samsara BioCapital, LLC added 588,235 shares of ALMS (+10.2%), bringing the total reported position to 6,345,219 shares at a market value of $139.8M.
Does the implied price-per-share represent Samsara BioCapital, LLC's cost basis in ALMS?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.