Tetra Tech, Inc.
US ˙ NasdaqGS ˙ US88162G1031

SecurityTTEK / Tetra Tech, Inc.
InstitutionD.a. Davidson & Co.
Latest Disclosed Ownership29,980 shares
Latest Disclosed Value $ 902,998
D.a. Davidson & Co. reports 1.20% decrease in ownership of TTEK / Tetra Tech, Inc.

On May 5, 2026 - D.a. Davidson & Co. filed a 13F-HR form disclosing ownership of 29,980 shares of Tetra Tech, Inc. (US:TTEK) valued at $902,998 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 29, 2026 disclosing 30,345 shares of Tetra Tech, Inc.. This represents a change in shares of -1.20% during the quarter. The current value of the position is $838,541 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)
2026-05-05 2026-03-31 13F TETRA TECH INC COM 88162G103 29,980 -365 -1.20 903 -11.31 0.0055
2026-01-29 2025-12-31 13F TETRA TECH INC COM 88162G103 30,345 -120 -0.39 1,018 0.10 0.0062
2025-10-22 2025-09-30 13F TETRA TECH INC COM 88162G103 30,465 1,800 6.28 1,017 -1.36 0.0065
2025-07-30 2025-06-30 13F TETRA TECH INC COM 88162G103 28,665 -4,995 -14.84 1,031 4.67 0.0073
2025-04-28 2025-03-31 13F TETRA TECH INC COM 88162G103 33,660 -6,218 -15.59 985 -38.04 0.0079
2025-01-31 2024-12-31 13F TETRA TECH INC COM 88162G103 39,878 -615 -1.52 1,589 -16.82 0.0129
2024-11-13 2024-09-30 13F TETRA TECH INC COM 88162G103 40,493 32,438 402.71 1,910 15.91 0.0158
2024-08-01 2024-06-30 13F TETRA TECH INC COM 88162G103 8,055 0 0.00 1,647 10.76 0.0146
2024-05-13 2024-03-31 13F TETRA TECH INC COM 88162G103 8,055 0 0.00 1,488 10.64 0.0134
2024-02-09 2023-12-31 13F TETRA TECH INC COM 88162G103 8,055 -1,927 -19.30 1,345 -11.40 0.0132
2023-11-08 2023-09-30 13F TETRA TECH INC COM 88162G103 9,982 32 0.32 1,518 -6.88 0.0165
2023-08-11 2023-06-30 13F TETRA TECH INC COM 88162G103 9,950 550 5.85 1,629 18.65 0.0172
2023-04-25 2023-03-31 13F TETRA TECH INC COM 88162G103 9,400 -600 -6.00 1,373 -5.96 0.0154
2023-02-03 2022-12-31 13F TETRA TECH INC COM 88162G103 10,000 0 0.00 1,460 14.96 0.0172
2022-11-07 2022-09-30 13F TETRA TECH INC COM 88162G103 10,000 0 0.00 1,270 -7.03 0.0166
2022-07-28 2022-06-30 13F TETRA TECH INC COM 88162G103 10,000 0 0.00 1,366 -17.16 0.0172
2022-05-12 2022-03-31 13F TETRA TECH INC COM 88162G103 10,000 0 0.00 1,649 -2.37 0.0180
2022-01-31 2021-12-31 13F TETRA TECH INC COM 88162G103 10,000 0 0.00 1,689 13.13 0.0180
2021-11-15 2021-09-30 13F TETRA TECH INC COM 88162G103 10,000 0 0.00 1,493 22.38 0.0173
2021-08-10 2021-06-30 13F TETRA TECH INC COM 88162G103 10,000 0 0.00 1,220 -10.10 0.0143
2021-05-07 2021-03-31 13F TETRA TECH INC COM 88162G103 10,000 0 0.00 1,357 17.18 0.0174
2021-02-10 2020-12-31 13F TETRA TECH INC COM 88162G103 10,000 0 0.00 1,158 21.26 0.0177
2020-11-02 2020-09-30 13F TETRA TECH INC COM 88162G103 10,000 0 0.00 955 20.73 0.0166
2020-08-10 2020-06-30 13F TETRA TECH INC COM 88162G103 10,000 -150 -1.48 791 8.65 0.0148
2020-05-05 2020-03-31 13F TETRA TECH INC COM 88162G103 10,150 150 1.50 728 -15.74 0.0142
2020-02-14 2019-12-31 13F TETRA TECH INC COM 88162G103 10,000 0 0.00 864 -0.46 0.0140
2019-11-05 2019-09-30 13F TETRA TECH INC COM 88162G103 10,000 0 0.00 868 10.43 0.0156
2019-08-13 2019-06-30 13F TETRA TECH INC COM 88162G103 10,000 0 0.00 786 31.88 0.0146
2019-05-13 2019-03-31 13F TETRA TECH INC COM 88162G103 10,000 -1,379 -12.12 596 1.19 0.0102
2019-01-29 2018-12-31 13F TETRA TECH INC COM 88162G103 11,379 -472 -3.98 589 -27.19 0.0115
2018-11-13 2018-09-30 13F TETRA TECH INC COM 88162G103 11,851 1,851 18.51 809 38.29 0.0144
2018-08-02 2018-06-30 13F TETRA TECH INC COM 88162G103 10,000 0 0.00 585 19.39 0.0115
2018-05-04 2018-03-31 13F TETRA TECH INC COM 88162G103 10,000 0 0.00 490 1.66 0.0101
2018-02-08 2017-12-31 13F TETRA TECH INC COM 88162G103 10,000 0 0.00 482 3.66 0.0101
2017-11-08 2017-09-30 13F TETRA TECH INC COM 88162G103 10,000 -2,415 -19.45 465 -17.99 0.0091
2017-08-11 2017-06-30 13F TETRA TECH COM 88162G103 12,415 10,000 414.08 567 478.57 0.0128
2017-05-12 2017-03-31 13F TETRA TECH COM 88162G103 2,415 22 0.92 98 -4.85 0.0024
2017-02-15 2016-12-31 13F TETRA TECH COM 88162G103 2,393 0 0.00 103 22.62 0.0023
2016-11-18 2016-09-30 13F/A-1 TETRA TECH COM 88162G103 2,393 -845 -26.10 84 -15.15 0.0021
2016-11-14 2016-09-30 13F TETRA TECH COM 88162G103 2,393 84
2016-08-13 2016-06-30 13F TETRA TECH COM 88162G103 3,238 -253 -7.25 99 -4.81 0.0029
2016-05-13 2016-03-31 13F TETRA TECH COM 88162G103 3,491 -640 -15.49 104 -2.80 0.0032
2016-02-12 2015-12-31 13F TETRA TECH COM 88162G103 4,131 -141 -3.30 107 3.88 0.0035
2015-11-13 2015-09-30 13F TETRA TECH COM 88162G103 4,272 -343 -7.43 103 -11.97 0.0036
2015-08-14 2015-06-30 13F TETRA TECH COM 88162G103 4,615 0 0.00 117 6.36 0.0038
2015-05-06 2015-03-31 13F TETRA TECH COM 88162G103 4,615 195 4.41 110 -6.78 0.0036
2015-02-12 2014-12-31 13F TETRA TECH COM 88162G103 4,420 2,299 108.39 118 126.92 0.0039
2014-11-12 2014-09-30 13F TETRA TECH COM 88162G103 2,121 -5,866 -73.44 52 -76.15 0.0018
2014-07-29 2014-06-30 13F TETRA TECH COM 88162G103 7,987 -8,405 -51.28 218 -54.96 0.0074
2014-05-05 2014-03-31 13F TETRA TECH COM 88162G103 16,392 1,480 9.92 484 16.35 0.0173
2014-02-13 2013-12-31 13F/A-1 TETRA TECH COM 88162G103 14,912 14,912 416 0.0155
2014-02-12 2013-12-31 13F TETRA TECH COM 88162G103 14,912 416 0.0155
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.