Citadel Advisors’s Tetra Tech TTEK Stock Holding History

Citadel Advisors’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	$521K	Buy	17,300 +2,800	+19%	+$99K	﹤0.01%	9203
2025 Q4	$486K	Sell	14,500 -23,000	-61%	-$778K	﹤0.01%	9090
2025 Q3	$1.25M	Sell	37,500 -56,200	-60%	-$2.04M	﹤0.01%	7059
2025 Q2	$3.37M	Buy	93,700 +3,800	+4%	+$126K	﹤0.01%	4780
2025 Q1	$2.63M	Buy	89,900 +37,300	+71%	+$1.25M	﹤0.01%	5008
2024 Q4	$2.1M	Sell	52,600 -66,500	-56%	-$2.99M	﹤0.01%	5524
2024 Q3	$5.62M	Sell	119,100 -69,900	-37%	-$3.11M	﹤0.01%	3759
2024 Q2	$7.73M	Buy	189,000 +94,000	+99%	+$3.83M	﹤0.01%	3134
2024 Q1	$3.51M	Sell	95,000 -215,000	-69%	-$7.45M	﹤0.01%	4538
2023 Q4	$10.3M	Buy	310,000 +205,500	+197%	+$6.56M	﹤0.01%	2795
2023 Q3	$3.18M	Buy	104,500 +62,500	+149%	+$2.03M	﹤0.01%	4381
2023 Q2	$1.38M	Sell	42,000 -16,500	-28%	-$485K	﹤0.01%	5831
2023 Q1	$1.72M	Buy	58,500 +25,500	+77%	+$737K	﹤0.01%	5666
2022 Q4	$958K	Sell	33,000 -39,500	-54%	-$1.14M	﹤0.01%	6902
2022 Q3	$1.86M	Buy	72,500 +10,500	+17%	+$294K	﹤0.01%	5723
2022 Q2	$1.69M	Sell	62,000 -25,500	-29%	-$699K	﹤0.01%	5886
2022 Q1	$2.89M	Sell	87,500 -34,000	-28%	-$1.05M	﹤0.01%	5286
2021 Q4	$4.13M	Sell	121,500 -17,000	-12%	-$586K	﹤0.01%	4677
2021 Q3	$4.14M	Buy	138,500 +70,500	+104%	+$1.94M	﹤0.01%	4675
2021 Q2	$1.66M	Sell	68,000 -15,000	-18%	-$377K	﹤0.01%	7066
2021 Q1	$2.25M	Sell	83,000 -31,000	-27%	-$821K	﹤0.01%	6111
2020 Q4	$2.64M	Buy	114,000 +32,000	+39%	+$721K	﹤0.01%	4795
2020 Q3	$1.57M	Sell	82,000 -21,000	-20%	-$373K	﹤0.01%	5189
2020 Q2	$1.63M	Sell	103,000 -76,000	-42%	-$1.15M	﹤0.01%	4927
2020 Q1	$2.53M	Buy	179,000 +75,500	+73%	+$1.29M	﹤0.01%	3763
2019 Q4	$1.78M	Sell	103,500 -7,500	-7%	-$130K	﹤0.01%	4599
2019 Q3	$1.93M	Buy	111,000 +1,500	+1%	+$24.5K	﹤0.01%	4534
2019 Q2	$1.72M	Buy	109,500 +71,000	+184%	+$957K	﹤0.01%	4774
2019 Q1	$459K	Buy	+38,500	New	+$432K	﹤0.01%	6935
2018 Q4	–	Sell	-52,000	Closed	-$710K	–	9776
2018 Q3	$710K	Buy	52,000 +17,000	+49%	+$225K	﹤0.01%	6139
2018 Q2	$410K	Buy	+35,000	New	+$374K	﹤0.01%	6695
2017 Q3	–	Sell	-26,000	Closed	-$238K	–	8067
2017 Q2	$238K	Buy	+26,000	New	+$232K	﹤0.01%	6291
2016 Q1	–	Sell	-12,500	Closed	-$65K	–	7974
2015 Q4	$65K	Buy	12,500 +2,500	+25%	+$13.4K	﹤0.01%	7098
2015 Q3	$49K	Sell	10,000 -5,000	-33%	-$25.6K	﹤0.01%	7601
2015 Q2	$77K	Buy	15,000 +10,500	+233%	+$53.8K	﹤0.01%	7334
2015 Q1	$22K	Buy	+4,500	New	+$22.3K	﹤0.01%	7849
2014 Q3	–	Sell	-3,500	Closed	-$19K	–	8406
2014 Q2	$19K	Buy	3,500 +3,000	+600%	+$16.4K	﹤0.01%	7315
2014 Q1	$3K	Sell	500 -8,500	-94%	-$49.5K	﹤0.01%	7703
2013 Q4	$50K	Hold	9,000	–	–	﹤0.01%	6036
2013 Q3	$47K	Sell	9,000 -3,500	-28%	-$16.8K	﹤0.01%	5821
2013 Q2	$59K	Buy	+12,500	New	+$66.3K	﹤0.01%	5576

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 $94.8B AUM 24.11% 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

Citadel Advisors's TTEK Position: Q1 2026 in Review

Citadel Advisors increased its Tetra Tech (TTEK) stake by 3,341% in Q1 2026, buying an estimated $59.7M and bringing the position to 1,740,911 shares worth $52.4M. The position accounts for 0.01% of the portfolio, ranked #1315.

Citadel Advisors first reported a position in TTEK in Q2 2013 and has held it in 44 quarters since. The position peaked at $103M in Q2 2025. 588 funds tracked by Wall St. Rank hold TTEK as of Q1 2026.

Citadel Advisors held 1,740,911 shares of Tetra Tech worth $52.4M as of Q1 2026.
Citadel Advisors bought 1,690,318 Tetra Tech shares in Q1 2026, an estimated $59.7M.
Tetra Tech made up 0.01% of Citadel Advisors's portfolio in Q1 2026, its #1315 holding.
Citadel Advisors first reported a position in Tetra Tech in Q2 2013 and has held it in 44 quarters since.
Citadel Advisors's Tetra Tech position peaked at $103M in Q2 2025.
588 funds tracked by Wall St. Rank held Tetra Tech as of Q1 2026.

Based on Citadel Advisors's 13F filing for Q1 2026, filed 15 May 2026.