Tetra Tech, Inc.
US ˙ NasdaqGS ˙ US88162G1031

SecurityTTEK / Tetra Tech, Inc.
InstitutionStandard Life Aberdeen plc
Latest Disclosed Ownership1,422,213 shares
Latest Disclosed Value $ 42,837,056
Standard Life Aberdeen plc reports 5.14% decrease in ownership of TTEK / Tetra Tech, Inc.

On April 29, 2026 - Standard Life Aberdeen plc filed a 13F-HR form disclosing ownership of 1,422,213 shares of Tetra Tech, Inc. (US:TTEK) valued at $42,837,056 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 16, 2026 disclosing 1,499,337 shares of Tetra Tech, Inc.. This represents a change in shares of -5.14% during the quarter. The current value of the position is $39,679,743 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-04-29 2026-03-31 13F TETRA TECH INC COM 88162G103 1,422,213 -77,124 -5.14 42,837 -14.81 0.0375
2026-01-16 2025-12-31 13F TETRA TECH INC COM 88162G103 1,499,337 -4,970 -0.33 50,288 -0.05 0.0779
2025-11-07 2025-09-30 13F TETRA TECH INC COM 88162G103 1,504,307 -51,404 -3.30 50,312 -9.80 0.0796
2025-07-24 2025-06-30 13F TETRA TECH INC COM 88162G103 1,555,711 50,834 3.38 55,780 26.64 0.0949
2025-05-13 2025-03-31 13F TETRA TECH INC COM 88162G103 1,504,877 -764,900 -33.70 44,048 -51.08 0.0859
2025-01-24 2024-12-31 13F TETRA TECH INC COM 88162G103 2,269,777 159,701 7.57 90,031 -8.58 0.1690
2024-10-25 2024-09-30 13F TETRA TECH INC COM 88162G103 2,110,076 1,644,267 352.99 98,477 3.39 0.1806
2024-08-09 2024-06-30 13F TETRA TECH INC COM 88162G103 465,809 -33,974 -6.80 95,249 3.18 0.1826
2024-05-09 2024-03-31 13F TETRA TECH INC COM 88162G103 499,783 24,463 5.15 92,315 16.35 0.1810
2024-01-31 2023-12-31 13F TETRA TECH INC COM 88162G103 475,320 5,962 1.27 79,345 11.20 0.1720
2023-11-07 2023-09-30 13F TETRA TECH INC COM 88162G103 469,358 -476,070 -50.35 71,356 -53.91 0.1821
2024-06-20 2023-06-30 13F/A-1 TETRA TECH INC COM 88162G103 945,428 133,793 16.48 154,804 29.83 0.3602
2023-08-04 2023-06-30 13F TETRA TECH INC COM 88162G103 945,428 133,793 154,804 0.3602
2024-06-20 2023-03-31 13F/A-1 TETRA TECH INC COM 88162G103 811,635 120,424 17.42 119,237 18.81 0.2984
2023-04-28 2023-03-31 13F TETRA TECH INC COM 88162G103 811,635 120,424 119,237 0.2984
2024-06-20 2022-12-31 13F/A-1 TETRA TECH INC COM 88162G103 691,211 -773 -0.11 100,357 12.83 0.2729
2023-02-10 2022-12-31 13F TETRA TECH INC COM 88162G103 691,211 -773 100,357 0.2729
2022-11-10 2022-09-30 13F TETRA TECH INC COM 88162G103 691,984 14,025 2.07 88,941 -3.43 0.2648
2022-08-05 2022-06-30 13F TETRA TECH INC COM 88162G103 677,959 12,227 1.84 92,101 -18.10 0.2895
2022-05-04 2022-03-31 13F TETRA TECH INC COM 88162G103 665,732 182,715 37.83 112,449 37.11 0.2875
2022-02-10 2021-12-31 13F/A-1 TETRA TECH INC COM 88162G103 483,017 48,782 11.23 82,016 25.10 0.1801
2022-02-08 2021-12-31 13F TETRA TECH INC COM 88162G103 483,017 48,782 82,016 0.0591
2021-11-15 2021-09-30 13F TETRA TECH INC COM 88162G103 434,235 141,940 48.56 65,558 83.77 0.1477
2021-08-10 2021-06-30 13F TETRA TECH INC COM 88162G103 292,295 -191,524 -39.59 35,674 -45.67 0.0781
2021-05-06 2021-03-31 13F TETRA TECH INC COM 88162G103 483,819 -95,820 -16.53 65,663 -2.19 0.1493
2021-02-10 2020-12-31 13F TETRA TECH INC COM 88162G103 579,639 -41,110 -6.62 67,133 13.17 0.1636
2020-10-21 2020-09-30 13F TETRA TECH INC COM 88162G103 620,749 17,155 2.84 59,318 24.21 0.1583
2020-08-10 2020-06-30 13F TETRA TECH INC COM 88162G103 603,594 409,760 211.40 47,757 248.90 0.1293
2020-05-13 2020-03-31 13F TETRA TECH INC COM 88162G103 193,834 193,834 13,688 0.0435
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.