TickerFacts.

Atara Biotherapeutics, Inc. (ATRA): Shares Outstanding

Annual figures by period end, from SEC filings.

Stock splits: 1-for-25, first reflected in a filing dated 2024-08-12. 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.

7.32M
As of 2025-12-31
9.44M
As of 2026-06-30
95.93M2013-12-31: 12.00M2014-12-31: 19.69M2015-12-31: 28.46M2016-12-31: 28.93M2017-12-31: 30.73M2018-12-31: 45.95M2019-12-31: 56.81M2020-12-31: 83.37M2021-12-31: 91.67M2022-12-31: 95.93M2023-12-31: 4.26M2024-12-31: 5.86M2025-12-31: 7.32M7.32M
2013-12-31 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
2025-12-317.32M+25.0%2026-03-16, Balance as of period end
2024-12-315.86M+37.6%2026-03-16, Balance as of period end
2023-12-314.26Mn/c2025-03-07, Balance as of period end
2022-12-3195.93M+4.6%2024-03-28, Balance as of period end
2021-12-3191.67M+10.0%2023-02-08, Balance as of period end
2020-12-3183.37Mn/c2022-02-28, Balance as of period end
2019-12-3156.81M+23.6%2021-03-01, Balance as of period end
2018-12-3145.95Mn/c2020-02-27, Balance as of period end
2017-12-3130.73M+6.2%2019-02-26, Balance as of period end
2016-12-3128.93M+1.7%2018-02-27, Balance as of period end
2015-12-3128.46Mn/c2017-03-09, Balance as of period end
2014-12-3119.69M+64.1%2016-03-04, Balance as of period end
2013-12-3112.00Mn/a2015-02-26, Balance as of period end