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TETRA TECH INC Director's Dealing 2026

Jan 14, 2026

30629_dirs_2026-01-14_08f315c8-65bd-4f14-bd6f-683825ace589.zip

Director's Dealing

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SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TETRA TECH INC (TTEK)
CIK: 0000831641
Period of Report: 2025-01-01

Reporting Person: Birkenbeuel Gary (Director)

Non-Derivative Transactions

Date Security Code Shares Price A/D Holdings After Ownership
2025-01-01 COMMON STOCK A 5270 Acquired 42995 Direct
2025-01-01 COMMON STOCK M 2050 Acquired 45045 Direct
2026-01-12 COMMON STOCK M 1590 Acquired 46635 Direct
2026-01-12 COMMON STOCK A 4397 Acquired 51032 Direct

Derivative Transactions

Date Security Exercise Price Code Shares A/D Expiration Underlying Ownership
2025-01-01 RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) $ M 2050 Disposed COMMON STOCK (2050) Direct
2026-01-12 RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) $ M 1590 Disposed COMMON STOCK (1590) Direct

Footnotes

F1: The PSUs vested on 11/21/2023 but were deferred pursuant to the Issuer's Deferred Compensation Plan and settled according to the Reporting Person's elected distribution schedule.

F2: Shares acquired pursuant to vesting of performance stock units earned under 2018 Equity Incentive Plan.

F3: The PSUs vested on 11/20/2024 but were deferred pursuant to the Issuer's Deferred Compensation Plan and settled according to the Reporting Person's elected distribution schedule.

F4: Represents an award of restricted stock units (RSUs), each unit of which represents a contingent right to receive one share of Tetra Tech common stock.

F5: On September 6, 2024, the balance of 410 shares was updated pursuant to a 5 to 1 forward stock split, resulting in an additional 1,640 shares of common stock.

F6: The restricted stock units (RSUs) became 100% vested as to the shares underlying the RSUs on November 18, 2021, but were deferred pursuant to the Issuer's Deferred Compensation Plan and settled according to the Reporting Person's elected distribution schedule.

F7: The RSUs are exercisable at the time of vesting and do not have a set expiration date.

F8: On September 6, 2024, the balance of 318 shares was updated pursuant to a 5 to 1 forward stock split, resulting in an additional 1,272 shares of common stock.

F9: The restricted stock units (RSUs) became 100% vested as to the shares underlying the RSUs on November 18, 2022, but were deferred pursuant to the Issuer's Deferred Compensation Plan and settled according to the Reporting Person's elected distribution schedule.