Tetra Tech, Inc.
US ˙ NasdaqGS ˙ US88162G1031

SecurityTTEK / Tetra Tech, Inc.
InstitutionStifel Financial Corp
Latest Disclosed Ownership48,953 shares
Latest Disclosed Value $ 1,474,461
Stifel Financial Corp reports 51.88% decrease in ownership of TTEK / Tetra Tech, Inc.

On May 12, 2026 - Stifel Financial Corp filed a 13F-HR form disclosing ownership of 48,953 shares of Tetra Tech, Inc. (US:TTEK) valued at $1,474,464 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 101,727 shares of Tetra Tech, Inc.. This represents a change in shares of -51.88% during the quarter. The current value of the position is $1,369,215 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)
2026-05-12 2026-03-31 13F TETRA TECH INC COM 88162G103 48,953 -52,774 -51.88 1,474 -56.79 0.0003
2026-02-13 2025-12-31 13F TETRA TECH INC COM 88162G103 101,727 -25,513 -20.05 3,412 -19.68 0.0031
2025-11-12 2025-09-30 13F TETRA TECH INC COM 88162G103 127,240 -1,299 -1.01 4,247 -8.11 0.0039
2025-08-14 2025-06-30 13F TETRA TECH INC COM 88162G103 128,539 -7,393 -5.44 4,622 16.25 0.0045
2025-05-14 2025-03-31 13F TETRA TECH INC COM 88162G103 135,932 8,762 6.89 3,976 -21.52 0.0042
2025-02-13 2024-12-31 13F TETRA TECH INC COM 88162G103 127,170 -22,095 -14.80 5,067 -28.03 0.0053
2024-11-14 2024-09-30 13F TETRA TECH INC COM 88162G103 149,265 122,846 464.99 7,039 30.30 0.0074
2024-08-13 2024-06-30 13F TETRA TECH INC COM 88162G103 26,419 -72 -0.27 5,403 10.38 0.0061
2024-05-14 2024-03-31 13F TETRA TECH INC COM 88162G103 26,491 106 0.40 4,894 11.10 0.0056
2024-02-12 2023-12-31 13F TETRA TECH INC COM 88162G103 26,385 -432 -1.61 4,405 8.05 0.0055
2023-11-13 2023-09-30 13F TETRA TECH INC COM 88162G103 26,817 2,593 10.70 4,077 2.80 0.0057
2023-08-14 2023-06-30 13F TETRA TECH INC COM 88162G103 24,224 520 2.19 3,967 13.90 0.0054
2023-05-12 2023-03-31 13F TETRA TECH INC COM 88162G103 23,704 -21 -0.09 3,482 1.10 0.0050
2023-02-13 2022-12-31 13F TETRA TECH INC COM 88162G103 23,725 -339 -1.41 3,445 11.35 0.0052
2022-11-14 2022-09-30 13F TETRA TECH INC COM 88162G103 24,064 1,483 6.57 3,093 0.29 0.0051
2022-08-15 2022-06-30 13F TETRA TECH INC COM 88162G103 22,581 -2,654 -10.52 3,084 -25.90 0.0048
2022-05-13 2022-03-31 13F TETRA TECH INC COM 88162G103 25,235 2,761 12.29 4,162 9.07 0.0057
2022-02-14 2021-12-31 13F TETRA TECH INC COM 88162G103 22,474 -387 -1.69 3,816 11.81 0.0050
2021-11-15 2021-09-30 13F TETRA TECH INC COM 88162G103 22,861 376 1.67 3,413 24.34 0.0050
2021-08-13 2021-06-30 13F TETRA TECH INC COM 88162G103 22,485 994 4.63 2,745 -5.90 0.0041
2021-05-14 2021-03-31 13F TETRA TECH INC COM 88162G103 21,491 6,287 41.35 2,917 65.64 0.0048
2021-02-12 2020-12-31 13F TETRA TECH INC COM 88162G103 15,204 1,651 12.18 1,761 36.09 0.0031
2020-11-16 2020-09-30 13F TETRA TECH INC COM 88162G103 13,553 3,176 30.61 1,294 57.61 0.0027
2020-08-14 2020-06-30 13F TETRA TECH INC COM 88162G103 10,377 -1,362 -11.60 821 -0.85 0.0019
2020-05-14 2020-03-31 13F TETRA TECH INC COM 88162G103 11,739 432 3.82 828 -15.08 0.0023
2020-02-13 2019-12-31 13F TETRA TECH INC COM 88162G103 11,307 1,481 15.07 975 14.57 0.0020
2019-11-19 2019-09-30 13F/A-1 TETRA TECH INC COM 88162G103 9,826 -5,200 -34.61 851 -27.88 0.0022
2019-11-13 2019-09-30 13F TETRA TECH INC COM 88162G103 9,826 -5,200 851 477.0282
2019-08-14 2019-06-30 13F TETRA TECH INC COM 88162G103 15,026 -9,165 -37.89 1,180 -18.06 0.0030
2019-05-14 2019-03-31 13F TETRA TECH INC COM 88162G103 24,191 -5,149 -17.55 1,440 -5.20 0.0041
2019-02-13 2018-12-31 13F TETRA TECH INC COM 88162G103 29,340 -3,117 -9.60 1,519 -31.48 0.0049
2018-11-13 2018-09-30 13F TETRA TECH INC COM 88162G103 32,457 -4,711 -12.67 2,217 1.88 0.0064
2018-08-14 2018-06-30 13F TETRA TECH INC COM 88162G103 37,168 -5,459 -12.81 2,176 4.07 0.0067
2018-05-11 2018-03-31 13F TETRA TECH INC COM 88162G103 42,627 -2,559 -5.66 2,091 -4.13 0.0066
2018-02-14 2017-12-31 13F TETRA TECH INC COM 88162G103 45,186 -945 -2.05 2,181 1.35 0.0069
2017-11-13 2017-09-30 13F TETRA TECH INC COM 88162G103 46,131 -2,640 -5.41 2,152 -3.80 0.0075
2017-08-14 2017-06-30 13F TETRA TECH INC COM 88162G103 48,771 3,490 7.71 2,237 20.98 0.0083
2017-05-10 2017-03-31 13F TETRA TECH INC COM 88162G103 45,281 1,203 2.73 1,849 -2.84 0.0072
2017-02-16 2016-12-31 13F TETRA TECH INC COM 88162G103 44,078 12,262 38.54 1,903 68.56 0.0081
2016-11-15 2016-09-30 13F TETRA TECH INC COM 88162G103 31,816 -3,931 -11.00 1,129 2.73 0.0051
2016-08-17 2016-06-30 13F TETRA TECH INC COM 88162G103 35,747 -19,286 -35.04 1,099 -33.03 0.0051
2016-05-16 2016-03-31 13F TETRA TECH INC COM 88162G103 55,033 -15,474 -21.95 1,641 -10.43 0.0087
2016-03-21 2015-12-31 13F/A-2 TETRA TECH INC COM 88162G103 70,507 -3,074 -4.18 1,832 2.52 0.0095
2016-02-26 2015-12-31 13F/A-1 TETRA TECH INC COM 88162G103 69,956 -551 1,817 0.0095
2016-02-16 2015-12-31 13F TETRA TECH INC COM 88162G103 64,923 3,146
2015-11-16 2015-09-30 13F TETRA TECH INC COM 88162G103 73,581 -13,361 -15.37 1,787 -19.97 0.0100
2015-08-17 2015-06-30 13F/A-1 TETRA TECH INC COM 88162G103 86,942 -349,341 -80.07 2,233 -78.69 0.0115
2015-08-17 2015-06-30 13F TETRA TECH INC COM 88162G103 86,291 2,218
2015-05-14 2015-03-31 13F TETRA TECH INC COM 88162G103 436,283 -102,541 -19.03 10,480 -27.14 0.0574
2015-02-13 2014-12-31 13F TETRA TECH INC COM 88162G103 538,824 538,824 14,384 0.0799
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.