Tetra Tech Inc (TTEK) Institutional Ownership

Ownership Summary

A total of 583 institutions have reported a stake in Tetra Tech Inc (NASDAQ:TTEK) as of September 2025, according to recent 13F filings with the SEC.

• The collective stake of institutional investors in Tetra Tech moved to 93.4% in September 2025, a shift down from the 93.6% reported for June 2025.
• The company experienced a 0.93% quarterly change in institutional shares held, alongside a decrease of 8.62% in total owners annually.
• The latest 13F cycle for Tetra Tech reveals that of 583 total investors, 279 funds grew their exposure, whereas 216 reduced theirs and 88 made no changes.
• The aggregate institutional position in Tetra Tech now stands at 246.19Mn shares as of September 2025, after investors increased their holdings (up by 2.26Mn shares quarter on quarter which is up 8.17Mn shares year over year).
• VANGUARD GROUP INC continues to be the largest institutional holder of Tetra Tech as of September 30, 2025, with a position of 26.30Mn shares, representing 9.98% of the company's outstanding stock.
• Among the most significant buyers of Tetra Tech during September 2025 were Capital International Investors (5.05Mn), SANDS CAPITAL MANAGEMENT, LLC (1.98Mn), JANUS HENDERSON GROUP PLC (1.67Mn), GOLDMAN SACHS GROUP INC (965.05K), AVIVA PLC (951.72K).
• Leading sellers of Tetra Tech stock in September 2025 included Sarasin & Partners LLP (4.27Mn), CITADEL ADVISORS LLC (1.20Mn), BOWEN HANES & CO INC (1.10Mn), Amundi (1.00Mn), STATE STREET CORP (649.01K).
• The top 10 institutional holders of Tetra Tech for the quarter ending September 2025 included VANGUARD GROUP INC (26.30Mn), BlackRock, Inc. (25.51Mn), Pictet Asset Management Holding SA (14.19Mn), STATE STREET CORP (11.29Mn), Neuberger Berman Group LLC (9.03Mn), SANDS CAPITAL MANAGEMENT, LLC (7.18Mn), Capital International Investors (7.08Mn), ALLIANCEBERNSTEIN L.P. (6.58Mn), Amundi (5.76Mn), GEODE CAPITAL MANAGEMENT, LLC (5.03Mn).