William Blair & Company’s Tetra Tech TTEK Stock Holding History

William Blair & Company’s Portfolio TTEK Stock Details TTEK Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$4.77M	Buy	158,442 +34,925	+28%	+$1.23M	0.01%	514
2025 Q4	$4.14M	Sell	123,517 -112,432	-48%	-$3.8M	0.01%	568
2025 Q3	$7.88M	Buy	235,949 +3,575	+2%	+$130K	0.02%	419
2025 Q2	$8.36M	Buy	232,374 +106,412	+84%	+$3.54M	0.02%	384
2025 Q1	$3.68M	Sell	125,962 -55,932	-31%	-$1.88M	0.01%	561
2024 Q4	$7.25M	Sell	181,894 -286,029	-61%	-$12.8M	0.02%	410
2024 Q3	$22.1M	Buy	467,923 +99,548	+27%	+$4.43M	0.06%	216
2024 Q2	$15.1M	Buy	+368,375	New	+$15M	0.05%	260

Other funds holding TTEK

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

VPM

Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

Capital International Investors Los Angeles, California $427B AUM 29.17% 1-Year Est. Return

Pictet Asset Management Carouge, Switzerland $105B AUM 38.07% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

Neuberger Berman Group New York $131B AUM 28.36% 1-Year Est. Return

Sands Capital Management Arlington, Virginia $25.5B AUM 26.46% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Fidelity International Hamilton, Bermuda $129B AUM 30.83% 1-Year Est. Return

William Blair & Company's TTEK Position: Q1 2026 in Review

William Blair & Company increased its Tetra Tech (TTEK) stake by 28% in Q1 2026, buying an estimated $1.23M and bringing the position to 158,442 shares worth $4.77M. The position accounts for 0.01% of the portfolio, ranked #514.

William Blair & Company first reported a position in TTEK in Q2 2024 and has held it in 8 quarters since. The position peaked at $22.1M in Q3 2024. 589 funds tracked by Wall St. Rank hold TTEK as of Q1 2026.

William Blair & Company held 158,442 shares of Tetra Tech worth $4.77M as of Q1 2026.
William Blair & Company bought 34,925 Tetra Tech shares in Q1 2026, an estimated $1.23M.
Tetra Tech made up 0.01% of William Blair & Company's portfolio in Q1 2026, its #514 holding.
William Blair & Company first reported a position in Tetra Tech in Q2 2024 and has held it in 8 quarters since.
William Blair & Company's Tetra Tech position peaked at $22.1M in Q3 2024.
589 funds tracked by Wall St. Rank held Tetra Tech as of Q1 2026.

Based on William Blair & Company's 13F filing for Q1 2026, filed 8 May 2026.