TickerFacts.

Alector, Inc. (ALEC): Shares Outstanding

Annual figures by period end, from SEC filings.

Restated years: each year's figure is from the latest filing that reports it. The company later restated the years ended 2021-12-31, 2022-12-31 (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.

110.36M
As of 2025-12-31
111.66M
As of 2026-06-30
+10.0%
3-year compound annual growth
2018-12-31: 13.76M2019-12-31: 69.05M2020-12-31: 79.32M2021-12-31: 81.99M2022-12-31: 82.90M2023-12-31: 84.88M2024-12-31: 99.09M2025-12-31: 110.36M110.36M
2018-12-31 Shares Outstanding (shares) 2025-12-31
Period endedShares OutstandingChange YoYSource filing
2025-12-31110.36M+11.4%2026-02-25, Balance as of period end
2024-12-3199.09M+16.7%2026-02-25, Balance as of period end
2023-12-3184.88M+2.4%2025-02-26, Balance as of period end
2022-12-3182.90Mn/c2024-02-27, Balance as of period end
2021-12-3181.99Mn/c2023-02-28, Balance as of period end
2020-12-3179.32M+14.9%2022-02-24, Balance as of period end
2019-12-3169.05Mn/c2021-02-25, Balance as of period end
2018-12-3113.76Mn/a2020-03-24, Balance as of period end