Tetra Tech, Inc.
US ˙ NasdaqGS ˙ US88162G1031

SecurityTTEK / Tetra Tech, Inc.
InstitutionKBC Group NV
Latest Disclosed Ownership7,936 shares
Latest Disclosed Value $ 239
KBC Group NV reports 16.43% increase in ownership of TTEK / Tetra Tech, Inc.

On May 7, 2026 - KBC Group NV filed a 13F-HR form disclosing ownership of 7,936 shares of Tetra Tech, Inc. (US:TTEK) valued at $239,032 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 6,816 shares of Tetra Tech, Inc.. The current value of the position is $220,621 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)
2026-05-07 2026-03-31 13F TETRA TECH INC COM 88162G103 7,936 1,120 16.43 0 0.0003
2026-01-26 2025-12-31 13F TETRA TECH INC COM 88162G103 6,816 0 0.00 0 0.0005
2026-01-20 2025-09-30 13F TETRA TECH INC COM 88162G103 6,816 0 0.00 0 0.0005
2025-08-08 2025-06-30 13F TETRA TECH INC COM 88162G103 6,816 -5,132 -42.95 0 0.0007
2025-04-25 2025-03-31 13F TETRA TECH INC COM 88162G103 11,948 738 6.58 0 0.0011
2025-01-22 2024-12-31 13F TETRA TECH INC COM 88162G103 11,210 4,310 62.46 0 0.0012
2024-11-06 2024-09-30 13F TETRA TECH INC COM 88162G103 6,900 5,639 447.18 0 0.0010
2024-07-17 2024-06-30 13F TETRA TECH INC COM 88162G103 1,261 117 10.23 0 0.0008
2024-05-08 2024-03-31 13F TETRA TECH INC COM 88162G103 1,144 144 14.40 0 0.0007
2024-02-13 2023-12-31 13F TETRA TECH INC COM 88162G103 1,000 131 15.07 0 0.0006
2024-02-15 2023-09-30 13F/A-1 TETRA TECH INC COM 88162G103 869 869 0 0.0005
2021-08-11 2021-06-30 13F TETRA TECH COM 88162G103 0 -1,700 -100.00 0 -100.00
2022-02-14 2021-03-31 13F/A-1 TETRA TECH INC COM 88162G103 1,700 0 0.00 231 -88.26 0.0009
2021-04-26 2021-03-31 13F TETRA TECH COM 88162G103 1,700 0 231 0.0009
2022-02-14 2020-12-31 13F/A-1 TETRA TECH INC COM 88162G103 1,700 -3,263 -65.75 1,968 315.19 0.0009
2021-02-10 2020-12-31 13F TETRA TECH INC COM 88162G103 1,700 -3,263 197 0.0009
2022-02-14 2020-09-30 13F/A-1 TETRA TECH INC COM 88162G103 4,963 -1,054 -17.52 474 -0.42 0.0028
2020-10-28 2020-09-30 13F TETRA TECH INC COM 88162G103 4,963 -1,054 474 0.0028
2022-02-14 2020-06-30 13F/A-1 TETRA TECH INC COM 88162G103 6,017 -108,414 -94.74 476 -94.11 0.0031
2020-08-10 2020-06-30 13F TETRA TECH INC COM 88162G103 6,017 -108,414 476 0.0032
2020-05-04 2020-03-31 13F TETRA TECH INC COM 88162G103 114,431 -292,395 -71.87 8,081 -76.95 0.0676
2020-02-11 2019-12-31 13F TETRA TECH INC COM 88162G103 406,826 -18,854 -4.43 35,052 -5.09 0.2216
2019-11-07 2019-09-30 13F TETRA TECH INC COM 88162G103 425,680 6,610 1.58 36,932 12.19 0.2709
2019-08-08 2019-06-30 13F/A-1 TETRA TECH INC COM 88162G103 419,070 127,866 43.91 32,918 89.70 0.2549
2019-07-30 2019-06-30 13F TETRA TECH INC COM 88162G103 419,070 127,866 32,918
2019-08-07 2019-03-31 13F/A-1 TETRA TECH INC COM 88162G103 291,204 7,315 2.58 17,353 18.07 0.1430
2019-05-10 2019-03-31 13F TETRA TECH INC COM 88162G103 291,204 7,315 17,353
2019-01-31 2018-12-31 13F TETRA TECH INC COM 88162G103 283,889 -69,334 -19.63 14,697 -39.08 0.1637
2018-11-14 2018-09-30 13F TETRA TECH INC COM 88162G103 353,223 39,670 12.65 24,125 31.52 0.1825
2018-08-03 2018-06-30 13F TETRA TECH INC COM 88162G103 313,553 22,278 7.65 18,343 28.65 0.1597
2018-08-03 2018-03-31 13F/A-1 TETRA TECH INC COM 88162G103 291,275 1,017 0.35 14,258 2.02 0.1319
2018-05-09 2018-03-31 13F TETRA TECH INC COM 88162G103 291,275 1,017 14,258
2018-08-03 2017-12-31 13F/A-1 TETRA TECH INC COM 88162G103 290,258 51,505 21.57 13,976 25.75 0.1195
2018-02-07 2017-12-31 13F TETRA TECH INC COM 88162G103 290,258 51,505 13,976
2017-11-13 2017-09-30 13F TETRA TECH INC COM 88162G103 238,753 65,163 37.54 11,114 39.94 0.1009
2017-08-04 2017-06-30 13F TETRA TECH INC COM 88162G103 173,590 -19,386 -10.05 7,942 0.75 0.0768
2017-05-10 2017-03-31 13F TETRA TECH INC COM 88162G103 192,976 -49,397 -20.38 7,883 -24.62 0.0712
2017-02-16 2016-12-31 13F TETRA TECH INC COM 88162G103 242,373 1,023 0.42 10,458 22.16 0.1037
2016-11-03 2016-09-30 13F TETRA TECH INC COM 88162G103 241,350 4,636 1.96 8,561 17.63 0.1011
2016-08-03 2016-06-30 13F TETRA TECH INC COM 88162G103 236,714 0 0.00 7,278 3.10 0.1041
2016-05-11 2016-03-31 13F TETRA TECH INC COM 88162G103 236,714 23,069 10.80 7,059 26.98 0.1173
2016-02-11 2015-12-31 13F TETRA TECH INC COM 88162G103 213,645 3,283 1.56 5,559 8.70 0.1024
2015-11-12 2015-09-30 13F TETRA TECH INC COM 88162G103 210,362 -1,719 -0.81 5,114 -5.94 0.1029
2015-12-16 2015-06-30 13F/A-1 TETRA TECH INC COM 88162G103 212,081 -12,268 -5.47 5,437 0.91 0.0699
2015-07-31 2015-06-30 13F TETRA TECH INC COM 88162G103 212,081 5,437
2015-12-16 2015-03-31 13F/A-1 TETRA TECH INC COM 88162G103 224,349 -6,271 -2.72 5,388 -12.49 0.0684
2015-04-30 2015-03-31 13F TETRA TECH INC COM 88162G103 224,349 5,388
2015-12-15 2014-12-31 13F/A-1 TETRA TECH INC COM 88162G103 230,620 -131,966 -36.40 6,157 -32.02 0.0733
2015-02-12 2014-12-31 13F TETRA TECH INC COM 88162G103 230,620 6,157
2014-10-16 2014-09-30 13F TETRA TECH INC COM 88162G103 362,586 -84,631 -18.92 9,057 -26.35 0.3161
2014-08-01 2014-06-30 13F TETRA TECH INC COM 88162G103 447,217 169,931 61.28 12,298 49.88 0.1405
2014-04-30 2014-03-31 13F TETRA TECH INC COM 88162G103 277,286 65,188 30.73 8,205 38.27 0.1296
2014-01-21 2013-12-31 13F TETRA TECH INC COM 88162G103 212,098 -92,444 -30.36 5,934 -24.74 0.0898
2013-11-06 2013-09-30 13F TETRA TECH INC COM 88162G103 304,542 35,825 13.33 7,885 24.82 0.1269
2013-07-29 2013-06-30 13F TETRA TECH INC COM 88162G103 268,717 268,717 6,317 0.1172
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.