TickerFacts.

Tetra Tech Inc (TTEK): Shares Outstanding

Annual figures by period end, from SEC filings.

Stock splits: 5-for-1, first reflected in a filing dated 2024-11-19. 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.

261.42M
As of 2025-09-28
256.04M
As of 2026-06-28
267.72M2009-09-27: 61.26M2010-10-03: 61.76M2011-10-02: 62.49M2012-09-30: 63.84M2013-09-29: 64.13M2014-09-28: 62.59M2015-09-27: 59.38M2016-10-02: 57.04M2017-10-01: 55.87M2018-09-30: 55.35M2019-09-29: 54.56M2020-09-27: 53.80M2021-10-03: 53.98M2022-10-02: 52.98M2023-10-01: 266.24M2024-09-29: 267.72M2025-09-28: 261.42M261.42M
2009-09-27 Shares Outstanding (shares) 2025-09-28

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

Period endedShares OutstandingChange YoYSource filing
2025-09-28261.42M-2.4%2025-11-20, Balance as of period end
2024-09-29267.72M+0.6%2025-11-20, Balance as of period end
2023-10-01266.24Mn/c2024-11-19, Balance as of period end
2022-10-0252.98M-1.9%2023-11-22, Balance as of period end
2021-10-0353.98M+0.3%2022-11-25, Balance as of period end
2020-09-2753.80M-1.4%2021-11-24, Balance as of period end
2019-09-2954.56M-1.4%2020-11-23, Balance as of period end
2018-09-3055.35M-0.9%2019-11-29, Balance as of period end
2017-10-0155.87M-2.0%2018-11-16, Balance as of period end
2016-10-0257.04M-3.9%2017-11-20, Balance as of period end
2015-09-2759.38M-5.1%2016-11-22, Balance as of period end
2014-09-2862.59M-2.4%2015-11-20, Balance as of period end
2013-09-2964.13M+0.5%2014-11-19, Balance as of period end
2012-09-3063.84M+2.1%2013-11-20, Balance as of period end
2011-10-0262.49M+1.2%2012-11-15, Balance as of period end
2010-10-0361.76M+0.8%2011-11-17, Balance as of period end
2009-09-2761.26Mn/a2010-11-16, Balance as of period end