Tetra Tech, Inc.
US ˙ NasdaqGS ˙ US88162G1031

SecurityTTEK / Tetra Tech, Inc.
InstitutionFmr Llc
Latest Disclosed Ownership328,252 shares
Latest Disclosed Value $ 9,886,962
Fmr Llc reports 7.07% decrease in ownership of TTEK / Tetra Tech, Inc.

On May 15, 2026 - Fmr Llc filed a 13F-HR form disclosing ownership of 328,252 shares of Tetra Tech, Inc. (US:TTEK) valued at $9,886,950 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 353,230 shares of Tetra Tech, Inc.. This represents a change in shares of -7.07% during the quarter. The current value of the position is $9,125,406 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)
2026-05-15 2026-03-31 13F TETRA TECH INC COM 88162G103 328,252 -24,978 -7.07 9,887 -16.55 0.0001
2026-02-17 2025-12-31 13F TETRA TECH INC COM 88162G103 353,230 13,892 4.09 11,847 4.59 0.0006
2025-11-13 2025-09-30 13F TETRA TECH INC COM 88162G103 339,338 394 0.12 11,327 -7.06 0.0006
2025-08-14 2025-06-30 13F TETRA TECH INC COM 88162G103 338,944 -93,872 -21.69 12,188 -3.72 0.0007
2025-05-12 2025-03-31 13F TETRA TECH INC COM 88162G103 432,816 -807,842 -65.11 12,660 -74.39 0.0008
2025-02-13 2024-12-31 13F TETRA TECH INC COM 88162G103 1,240,658 118,145 10.53 49,428 -6.63 0.0029
2024-11-13 2024-09-30 13F TETRA TECH INC COM 88162G103 1,122,513 965,828 616.41 52,938 65.23 0.0032
2024-08-13 2024-06-30 13F TETRA TECH INC COM 88162G103 156,685 -14,297 -8.36 32,039 1.45 0.0021
2024-05-13 2024-03-31 13F TETRA TECH INC COM 88162G103 170,982 -35,920 -17.36 31,582 -8.56 0.0021
2024-02-13 2023-12-31 13F TETRA TECH INC COM 88162G103 206,902 83,739 67.99 34,538 84.46 0.0027
2023-11-13 2023-09-30 13F TETRA TECH INC COM 88162G103 123,163 682 0.56 18,724 -6.64 0.0016
2023-08-11 2023-06-30 13F TETRA TECH INC COM 88162G103 122,481 -98,763 -44.64 20,055 -38.30 0.0017
2023-08-11 2023-03-31 13F/A-1 TETRA TECH INC COM 88162G103 221,244 4,835 2.23 32,503 3.44 0.0030
2023-05-11 2023-03-31 13F TETRA TECH INC COM 88162G103 221,244 4,835 32,503 0.0006
2023-02-13 2022-12-31 13F TETRA TECH INC COM 88162G103 216,409 -82,362 -27.57 31,420 -18.18 0.0031
2022-11-10 2022-09-30 13F TETRA TECH INC COM 88162G103 298,771 42,678 16.67 38,401 9.81 0.0040
2022-08-12 2022-06-30 13F TETRA TECH INC COM 88162G103 256,093 -35,316 -12.12 34,969 -27.24 0.0035
2022-05-13 2022-03-31 13F TETRA TECH INC COM 88162G103 291,409 -263,596 -47.49 48,064 -49.00 0.0038
2022-02-14 2021-12-31 13F TETRA TECH INC COM 88162G103 555,005 -137,700 -19.88 94,240 -8.90 0.0070
2022-02-14 2021-09-30 13F/A-1 TETRA TECH INC COM 88162G103 692,705 75,696 12.27 103,449 37.38 0.0082
2021-11-15 2021-09-30 13F TETRA TECH INC COM 88162G103 692,705 75,696 103,449 0.0082
2021-08-13 2021-06-30 13F TETRA TECH INC COM 88162G103 617,009 -544,369 -46.87 75,300 -52.23 0.0059
2021-05-14 2021-03-31 13F TETRA TECH INC COM 88162G103 1,161,378 68,194 6.24 157,622 24.54 0.0135
2021-02-08 2020-12-31 13F TETRA TECH INC COM 88162G103 1,093,184 -152,680 -12.25 126,567 6.38 0.0113
2020-11-13 2020-09-30 13F TETRA TECH INC COM 88162G103 1,245,864 419,013 50.68 118,980 81.87 0.0120
2020-08-24 2020-06-30 13F/A-1 TETRA TECH INC COM 88162G103 826,851 -250,552 -23.26 65,420 -14.02 0.0072
2020-08-13 2020-06-30 13F TETRA TECH INC COM 88162G103 826,851 -250,552 65,420 1,607.1780
2020-05-14 2020-03-31 13F TETRA TECH INC COM 88162G103 1,077,403 37,115 3.57 76,086 -15.11 0.0105
2020-02-07 2019-12-31 13F TETRA TECH INC COM 88162G103 1,040,288 164,272 18.75 89,631 17.93 0.0099
2019-11-13 2019-09-30 13F TETRA TECH INC COM 88162G103 876,016 232,257 36.08 76,004 50.30 0.0091
2019-08-13 2019-06-30 13F TETRA TECH INC COM 88162G103 643,759 620,549 2,673.63 50,567 3,556.33 0.0059
2019-05-13 2019-03-31 13F TETRA TECH INC COM 88162G103 23,210 22,511 3,220.46 1,383 3,741.67 0.0002
2019-02-13 2018-12-31 13F TETRA TECH INC COM 88162G103 699 -355 -33.68 36 -50.00 0.0000
2018-11-09 2018-09-30 13F TETRA TECH INC COM 88162G103 1,054 1,054 72 0.0000
2014-11-14 2014-09-30 13F TETRA TECH INC COM 88162G103 0 -14,200 -100.00 0 -100.00
2014-08-14 2014-06-30 13F TETRA TECH INC COM 88162G103 14,200 -2,608,641 -99.46 391 -99.50 0.0001
2014-05-15 2014-03-31 13F TETRA TECH INC COM 88162G103 2,622,841 -40,877 -1.53 77,610 4.13 0.0108
2014-02-13 2013-12-31 13F TETRA TECH INC COM 88162G103 2,663,718 -1,118,682 -29.58 74,531 -23.89 0.0105
2013-11-14 2013-09-30 13F TETRA TECH INC COM 88162G103 3,782,400 281,100 8.03 97,927 18.96 0.0150
2013-09-24 2013-06-30 13F/A-1 TETRA TECH INC COM 88162G103 3,501,300 3,501,300 82,316 0.0135
2013-08-14 2013-06-30 13F TETRA TECH INC COM 88162G103 3,501,300 82,316 0.0135
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.