TickerFacts.

Tectonic Therapeutic, Inc. (TECX): Shares Outstanding

Annual figures by period end, from SEC filings.

Stock splits: 1-for-32, first reflected in a filing dated 2025-03-20. 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.

Restated years: each year's figure is from the latest filing that reports it. The company later restated the years ended 2020-12-31, 2021-12-31 (for example after a spin-off or a discontinued operation), while the year before each was last reported on the old basis. Changes across those points are marked n/c (not comparable), and growth rates are not computed across them.

18.74M
As of 2025-12-31
19.24M
As of 2026-06-30
43.92M2017-12-31: 2.31M2018-12-31: 23.81M2019-12-31: 31.64M2020-12-31: 43.65M2021-12-31: 43.65M2022-12-31: 43.92M2023-12-31: 1.41M2024-12-31: 14.86M2025-12-31: 18.74M18.74M
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
2025-12-3118.74M+26.1%2026-02-26, Balance as of period end
2024-12-3114.86M+955.3%2026-02-26, Balance as of period end
2023-12-311.41Mn/c2025-03-20, Balance as of period end
2022-12-3143.92M+0.6%2024-03-14, Balance as of period end
2021-12-3143.65Mn/c2023-03-23, Balance as of period end
2020-12-3143.65Mn/c2022-03-17, Balance as of period end
2019-12-3131.64M+32.9%2021-03-18, Balance as of period end
2018-12-3123.81Mn/c2020-03-16, Balance as of period end
2017-12-312.31Mn/a2019-03-25, Balance as of period end