Tetra Tech, Inc. (TTEK)

Tetra Tech Employees

Tetra Tech had 25,000 employees as of September 28, 2025. The number of employees decreased by 5,000 or -16.67% compared to the previous year.

• Employees: 25,000
• Change (1Y): -5,000
• Growth (1Y): -16.67%
• Revenue / Employee: $176,125
• Profits / Employee: $17,610
• Market Cap: 7.13B

Employees History

Date	Employees	Change (1Y)	Growth (1Y)
Sep 28, 2025	25,000	-5,000	-16.67%
Sep 29, 2024	30,000	3,000	11.11%
Oct 1, 2023	27,000	6,000	28.57%
Oct 2, 2022	21,000	0	-
Oct 3, 2021	21,000	1,000	5.00%
Sep 27, 2020	20,000	0	-
Sep 29, 2019	20,000	3,000	17.65%
Sep 30, 2018	17,000	1,000	6.25%
Oct 1, 2017	16,000	0	-
Oct 2, 2016	16,000	3,000	23.08%
Sep 27, 2015	13,000	-1,000	-7.14%
Sep 28, 2014	14,000	0	-
Sep 29, 2013	14,000	1,000	7.69%
Sep 30, 2012	13,000	0	-
Oct 2, 2011	13,000	1,000	8.33%
Oct 3, 2010	12,000	2,000	20.00%
Sep 27, 2009	10,000	800	8.70%
Sep 28, 2008	9,200	1,400	17.95%
Sep 30, 2007	7,800	500	6.85%
Oct 1, 2006	7,300	-400	-5.19%
Oct 2, 2005	7,700	-900	-10.47%
Oct 3, 2004	8,600	-300	-3.37%
Sep 28, 2003	8,900	1,408	18.79%
Sep 29, 2002	7,492	92	1.24%
Sep 30, 2001	7,400	799	12.10%
Oct 1, 2000	6,601	1,158	21.28%
Oct 3, 1999	5,443	1,781	48.63%
Oct 4, 1998	3,662	1,400	61.89%
Sep 28, 1997	2,262	373	19.75%
Sep 29, 1996	1,889	-	-

Data Source: Official company filings Last updated: Sep 28, 2025

The employees data for this stock was gathered manually by the Stock Analysis team based on SEC filings and investor relations materials.

Update frequency:

Yearly

Last checked:

May 30, 2026

Data Sources Report a data error