TickerFacts.

Sutro Biopharma, Inc. (STRO): Shares Outstanding

Annual figures by period end, from SEC filings.

Stock splits: 1-for-10, first reflected in a filing dated 2026-03-23. Figures are as filed: per-share figures and share counts last reported before a split are on the old share basis, so changes and growth rates across a split are not shown. Splits are read from the filings' own restatements, so a share conversion in a merger or reorganization shows up the same way.

8.58M
As of 2025-12-31
16.58M
As of 2026-06-30
61.01M2017-12-31: 465.3K2018-12-31: 22.85M2019-12-31: 23.10M2020-12-31: 45.75M2021-12-31: 46.33M2022-12-31: 57.50M2023-12-31: 61.01M2024-12-31: 8.31M2025-12-31: 8.58M8.58M
2017-12-31 Shares Outstanding (shares) 2025-12-31

Paler bars were last filed before a stock split, on the old share basis.

Period endedShares OutstandingChange YoYSource filing
2025-12-318.58M+3.3%2026-03-23, Balance as of period end
2024-12-318.31Mn/c2026-03-23, Balance as of period end
2023-12-3161.01M+6.1%2025-03-13, Balance as of period end
2022-12-3157.50M+24.1%2024-03-25, Balance as of period end
2021-12-3146.33M+1.3%2023-03-30, Balance as of period end
2020-12-3145.75Mn/c2022-02-28, Balance as of period end
2019-12-3123.10M+1.1%2021-03-18, Balance as of period end
2018-12-3122.85Mn/m2020-03-16, Balance as of period end
2017-12-31465.3Kn/a2019-04-01, Balance as of period end