Tetra Tech, Inc.
MX ˙ BMV ˙ US88162G1031
SecurityMX:TTEK / Tetra Tech, Inc.
InstitutionFirst Trust Advisors Lp
Latest Disclosed Ownership2,445,482 shares
Latest Disclosed Value $ 73,657,890
First Trust Advisors Lp reports 47.59% increase in ownership of TTEK / Tetra Tech, Inc.

On May 13, 2026 - First Trust Advisors Lp filed a 13F-HR form disclosing ownership of 2,445,482 shares of Tetra Tech, Inc. (MX:TTEK) valued at $73,657,890 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,656,991 shares of Tetra Tech, Inc.. This represents a change in shares of 47.59% during the quarter.

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)
2026-05-13 2026-03-31 13F TETRA TECH INC COM 88162G103 2,445,482 788,491 47.59 73,658 32.54 0.0525
2026-02-13 2025-12-31 13F TETRA TECH INC COM 88162G103 1,656,991 -324,502 -16.38 55,575 -15.98 0.0404
2025-11-12 2025-09-30 13F TETRA TECH INC COM 88162G103 1,981,493 679,424 52.18 66,142 41.26 0.0492
2025-08-13 2025-06-30 13F TETRA TECH INC COM 88162G103 1,302,069 -92,532 -6.64 46,822 14.78 0.0377
2025-05-14 2025-03-31 13F TETRA TECH INC COM 88162G103 1,394,601 -709,499 -33.72 40,792 -51.34 0.0361
2025-02-13 2024-12-31 13F TETRA TECH INC COM 88162G103 2,104,100 -3,295 -0.16 83,827 -15.65 0.0739
2024-11-13 2024-09-30 13F TETRA TECH INC COM 88162G103 2,107,395 1,692,389 407.80 99,385 17.12 0.0947
2024-08-13 2024-06-30 13F TETRA TECH INC COM 88162G103 415,006 44,857 12.12 84,860 24.12 0.0865
2024-05-13 2024-03-31 13F TETRA TECH INC COM 88162G103 370,149 -145,562 -28.23 68,370 -20.58 0.0694
2024-02-13 2023-12-31 13F TETRA TECH INC COM 88162G103 515,711 41,860 8.83 86,088 19.50 0.0939
2023-11-13 2023-09-30 13F TETRA TECH INC COM 88162G103 473,851 41,870 9.69 72,040 1.85 0.0854
2023-08-14 2023-06-30 13F TETRA TECH INC COM 88162G103 431,981 -37,179 -7.92 70,733 2.62 0.0804
2023-05-15 2023-03-31 13F TETRA TECH INC COM 88162G103 469,160 24,263 5.45 68,924 6.70 0.0796
2023-02-09 2022-12-31 13F TETRA TECH INC COM 88162G103 444,897 -50,593 -10.21 64,595 1.43 0.0768
2022-11-14 2022-09-30 13F TETRA TECH INC COM 88162G103 495,490 102,727 26.15 63,685 18.74 0.0826
2022-08-12 2022-06-30 13F TETRA TECH INC COM 88162G103 392,763 16,758 4.46 53,632 -13.52 0.0662
2022-05-13 2022-03-31 13F TETRA TECH INC COM 88162G103 376,005 -54,599 -12.68 62,019 -15.18 0.0634
2022-02-08 2021-12-31 13F TETRA TECH INC COM 88162G103 430,604 26,979 6.68 73,116 21.30 0.0711
2021-11-15 2021-09-30 13F TETRA TECH INC COM 88162G103 403,625 87,769 27.79 60,277 56.37 0.0648
2021-10-12 2021-06-30 13F/A-1 TETRA TECH INC COM 88162G103 315,856 71,504 29.26 38,547 16.23 0.0417
2021-08-16 2021-06-30 13F TETRA TECH INC COM 88162G103 315,856 71,504 38,547 0.0398
2021-05-14 2021-03-31 13F TETRA TECH INC COM 88162G103 244,352 -17,118 -6.55 33,164 9.55 0.0402
2021-02-02 2020-12-31 13F TETRA TECH INC COM 88162G103 261,470 -21,439 -7.58 30,273 12.05 0.0401
2020-11-05 2020-09-30 13F TETRA TECH INC COM 88162G103 282,909 -26,294 -8.50 27,018 10.44 0.0433
2020-07-22 2020-06-30 13F TETRA TECH INC COM 88162G103 309,203 -6,949 -2.20 24,464 9.57 0.0424
2020-05-06 2020-03-31 13F TETRA TECH INC COM 88162G103 316,152 -24,426 -7.17 22,327 -23.91 0.0506
2020-02-03 2019-12-31 13F TETRA TECH INC COM 88162G103 340,578 68,204 25.04 29,344 24.18 0.0501
2019-11-04 2019-09-30 13F TETRA TECH INC COM 88162G103 272,374 -37,919 -12.22 23,631 -3.05 0.0445
2019-07-30 2019-06-30 13F TETRA TECH INC COM 88162G103 310,293 690 0.22 24,374 32.12 0.0460
2019-06-19 2019-03-31 13F/A-1 TETRA TECH INC COM 88162G103 309,603 11,837 3.98 18,449 19.68 0.0367
2019-05-09 2019-03-31 13F TETRA TECH INC COM 88162G103 309,603 11,837 18,449
2019-02-07 2018-12-31 13F TETRA TECH INC COM 88162G103 297,766 -27,594 -8.48 15,415 -30.63 0.0365
2018-10-25 2018-09-30 13F TETRA TECH INC COM 88162G103 325,360 22,059 7.27 22,222 25.24 0.0414
2018-08-02 2018-06-30 13F TETRA TECH INC COM 88162G103 303,301 64,417 26.97 17,743 51.74 0.0368
2018-04-23 2018-03-31 13F TETRA TECH INC COM 88162G103 238,884 -13,723 -5.43 11,693 -3.86 0.0269
2018-02-08 2017-12-31 13F TETRA TECH INC COM 88162G103 252,607 56,364 28.72 12,163 33.15 0.0290
2017-10-24 2017-09-30 13F TETRA TECH INC COM 88162G103 196,243 -11,731 -5.64 9,135 -3.99 0.0235
2017-08-02 2017-06-30 13F TETRA TECH INC COM 88162G103 207,974 36,684 21.42 9,515 35.99 0.0254
2017-05-02 2017-03-31 13F TETRA TECH INC COM 88162G103 171,290 -89,434 -34.30 6,997 -37.80 0.0194
2017-02-06 2016-12-31 13F TETRA TECH INC COM 88162G103 260,724 89,158 51.97 11,250 84.88 0.0335
2016-11-01 2016-09-30 13F TETRA TECH INC COM 88162G103 171,566 -2,288 -1.32 6,085 13.84 0.0182
2016-08-04 2016-06-30 13F TETRA TECH INC COM 88162G103 173,854 66,922 62.58 5,345 67.61 0.0168
2016-05-10 2016-03-31 13F TETRA TECH INC COM 88162G103 106,932 -31,007 -22.48 3,189 -11.15 0.0102
2016-05-04 2015-12-31 13F/A-1 TETRA TECH INC COM 88162G103 137,939 -52,660 -27.63 3,589 -22.53 0.0093
2016-02-03 2015-12-31 13F TETRA TECH INC COM 88162G103 137,939 3,589
2015-11-05 2015-09-30 13F TETRA TECH INC COM 88162G103 190,599 -100,993 -34.64 4,633 -38.03 0.0134
2015-08-04 2015-06-30 13F TETRA TECH INC COM 88162G103 291,592 42,675 17.14 7,476 25.04 0.0194
2015-05-04 2015-03-31 13F TETRA TECH INC COM 88162G103 248,917 -4,711 -1.86 5,979 -11.71 0.0176
2015-02-13 2014-12-31 13F TETRA TECH INC COM 88162G103 253,628 105,439 71.15 6,772 82.93 0.0228
2014-11-12 2014-09-30 13F TETRA TECH INC COM 88162G103 148,189 -6,399 -4.14 3,702 -12.91 0.0146
2014-08-11 2014-06-30 13F TETRA TECH INC COM 88162G103 154,588 154,588 -25.02 4,251 -20.36 0.0177
2014-08-08 2013-12-31 13F/A-1 TETRA TECH INC COM 88162G103 0 -206,163 -100.00 0 -100.00
2013-11-12 2013-09-30 13F TETRA TECH INC COM 88162G103 206,163 42,665 26.10 5,338 38.87 0.0289
2013-08-12 2013-06-30 13F TETRA TECH INC COM 88162G103 163,498 163,498 3,844 0.0250
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.