Tetra Tech, Inc.
US ˙ NasdaqGS ˙ US88162G1031

SecurityTTEK / Tetra Tech, Inc.
InstitutionAmalgamated Bank
Latest Disclosed Ownership118,784 shares
Latest Disclosed Value $ 3,578
Amalgamated Bank reports 0.75% increase in ownership of TTEK / Tetra Tech, Inc.

On May 8, 2026 - Amalgamated Bank filed a 13F-HR form disclosing ownership of 118,784 shares of Tetra Tech, Inc. (US:TTEK) valued at $3,577,774 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 117,904 shares of Tetra Tech, Inc.. This represents a change in shares of 0.75% during the quarter. The current value of the position is $3,302,195 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)
2026-05-08 2026-03-31 13F TETRA TECH COM 88162G103 118,784 880 0.75 4 0.00 0.0274
2026-02-05 2025-12-31 13F TETRA TECH COM 88162G103 117,904 -3,481 -2.87 4 -25.00 0.0285
2025-10-29 2025-09-30 13F TETRA TECH COM 88162G103 121,385 -329 -0.27 4 0.00 0.0290
2025-08-04 2025-06-30 13F TETRA TECH COM 88162G103 121,714 -1,750 -1.42 4 33.33 0.0338
2025-04-25 2025-03-31 13F TETRA TECH COM 88162G103 123,464 -5,417 -4.20 4 -40.00 0.0309
2025-02-04 2024-12-31 13F TETRA TECH COM 88162G103 128,881 579 0.45 5 -16.67 0.0421
2024-10-30 2024-09-30 13F TETRA TECH COM 88162G103 128,302 101,125 372.10 6 20.00 0.0498
2024-08-12 2024-06-30 13F TETRA TECH COM 88162G103 27,177 -2,121 -7.24 6 0.00 0.0473
2024-04-23 2024-03-31 13F TETRA TECH COM 88162G103 29,298 -5,578 -15.99 5 0.00 0.0463
2024-02-06 2023-12-31 13F TETRA TECH COM 88162G103 34,876 -947 -2.64 6 0.00 0.0464
2023-11-08 2023-09-30 13F TETRA TECH COM 88162G103 35,823 -440 -1.21 5 0.00 0.0464
2023-08-11 2023-06-30 13F TETRA TECH COM 88162G103 36,263 -2,130 -5.55 6 0.00 0.0481
2023-05-02 2023-03-31 13F TETRA TECH COM 88162G103 38,393 -1,074 -2.72 6 0.00 0.0481
2023-02-10 2022-12-31 13F TETRA TECH COM 88162G103 39,467 -412 -1.03 6 -99.90 0.0511
2022-11-09 2022-09-30 13F TETRA TECH COM 88162G103 39,879 -291 -0.72 5,126 -6.55 0.0495
2022-08-15 2022-06-30 13F TETRA TECH COM 88162G103 40,170 3,463 9.43 5,485 -9.40 0.0511
2022-08-25 2022-03-31 13F/A-1 TETRA TECH COM 88162G103 36,707 -1,786 -4.64 6,054 -7.37 0.0470
2022-06-30 2022-03-31 13F TETRA TECH COM 88162G103 36,707 -1,786 6,054 0.0481
2022-02-15 2021-12-31 13F/A-1 TETRA TECH COM 88162G103 38,493 143 0.37 6,536 14.13 0.0482
2022-02-15 2021-12-31 13F TETRA TECH COM 88162G103 38,493 143 6,536 0.0482
2021-10-29 2021-09-30 13F TETRA TECH COM 88162G103 38,350 -4,110 -9.68 5,727 10.52 0.0484
2021-08-16 2021-06-30 13F TETRA TECH COM 88162G103 42,460 34,318 421.49 5,182 368.96 0.0415
2021-05-13 2021-03-31 13F TETRA TECH COM 88162G103 8,142 -752 -8.46 1,105 7.28 0.0414
2021-02-12 2020-12-31 13F TETRA TECH COM 88162G103 8,894 80 0.91 1,030 22.33 0.0390
2020-10-30 2020-09-30 13F TETRA TECH COM 88162G103 8,814 -288 -3.16 842 16.94 0.0366
2020-08-10 2020-06-30 13F TETRA TECH COM 88162G103 9,102 -1,186 -11.53 720 -0.96 0.0333
2020-05-13 2020-03-31 13F TETRA TECH COM 88162G103 10,288 -406 -3.80 727 -21.06 0.0178
2020-02-13 2019-12-31 13F TETRA TECH COM 88162G103 10,694 552 5.44 921 4.66 0.0169
2019-11-13 2019-09-30 13F TETRA TECH COM 88162G103 10,142 -156 -1.51 880 8.78 0.0185
2019-08-14 2019-06-30 13F TETRA TECH COM 88162G103 10,298 1,449 16.37 809 53.51 0.0189
2019-05-15 2019-03-31 13F TETRA TECH COM 88162G103 8,849 211 2.44 527 17.90 0.0128
2019-02-15 2018-12-31 13F TETRA TECH COM 88162G103 8,638 4,562 111.92 447 60.79 0.0127
2018-11-14 2018-09-30 13F TETRA TECH COM 88162G103 4,076 -4,916 -54.67 278 -47.15 0.0069
2018-07-18 2018-06-30 13F TETRA TECH COM 88162G103 8,992 951 11.83 526 33.50 0.0129
2018-05-22 2018-03-31 13F TETRA TECH COM 88162G103 8,041 -128 -1.57 394 0.25 0.0105
2018-02-13 2017-12-31 13F TETRA TECH COM 88162G103 8,169 341 4.36 393 7.97 0.0106
2017-11-09 2017-09-30 13F TETRA TECH COM 88162G103 7,828 -161 -2.02 364 -0.27 0.0113
2017-08-10 2017-06-30 13F TETRA TECH COM 88162G103 7,989 202 2.59 365 14.78 0.0120
2017-05-12 2017-03-31 13F TETRA TECH COM 88162G103 7,787 -10 -0.13 318 -5.36 0.0158
2017-02-14 2016-12-31 13F TETRA TECH COM 88162G103 7,797 945 13.79 336 38.27 0.0152
2016-11-15 2016-09-30 13F/A-1 TETRA TECH COM 88162G103 6,852 -2 -0.03 243 4.74 0.0141
2016-08-16 2016-06-30 13F TETRA TECH COM 88162G103 6,854 6,854 232 0.0134
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.