Samsara BioCapital, LLC: SUTRO BIOPHARMA INC (STRO): Quarterly 13F Position History
As of Q1 2026, Samsara BioCapital, LLC reported 1,062,872 shares of SUTRO BIOPHARMA INC (STRO), worth $26.5M and representing 2.6% of its 13F equity book. Quarter-over-quarter share count change: + 858,369 (+419.7%) . The position first appeared in Q4 2025 and has been disclosed across 2 13F-HR filings in Pactolio's tracked window.
- 1,062,872Shares Held (Latest Filing)
- $26.5MReported Market Value (Latest Filing)
- 2.6%Portfolio Weight (% of 13F Equity Book)
- +858,369Quarter-over-Quarter Share Change
- +$24.1MQuarter-over-Quarter Value Change
- 1,062,872Peak Reported Shares (Historical)
Recent initiation: Samsara BioCapital, LLC first reported STRO on the Q4 2025 filing — fewer than three quarters of history are available.
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 2 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 1,062,872 | +858,369 | +419.7% | $26.5M | 2.6% | $24.9 |
| Q4 2025 | 204,503 | — | — | $2.4M | 0.2% | $11.6 |
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 STRO position in 13F-HR filings?
Samsara BioCapital, LLC first reported SUTRO BIOPHARMA INC (STRO) on its 13F-HR filing for the period ending 2025-12-31 (Q4 2025). The position has appeared on 2 reported quarters within Pactolio's tracked window.
What was Samsara BioCapital, LLC's most recent quarter-over-quarter share-count change in STRO?
Between Q4 2025 and Q1 2026, Samsara BioCapital, LLC added 858,369 shares of STRO (+419.7%), bringing the total reported position to 1,062,872 shares at a market value of $26.5M.
Does the implied price-per-share represent Samsara BioCapital, LLC's cost basis in STRO?
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.