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Tetra Tech Inc received an amended Schedule 13G/A filing from The Vanguard Group reporting 0 shares beneficially owned of Common Stock, representing 0% of the class. The filing notes an internal realignment of Vanguard on January 12, 2026 that caused disaggregation of certain subsidiaries' holdings.
The amendment lists Vanguard's address and confirms no sole or shared voting or dispositive power over any Tetra Tech shares in the filing. The form is signed by Vanguard's Head of Global Fund Administration on 03/27/2026.
Tetra Tech, Inc. announced that Eric W. Thornburg has been appointed to its Board of Directors, effective March 30, 2026, to serve until the next annual stockholder meeting or until a successor is chosen and qualified. The Board will then have eight members.
Thornburg, a 40-year water industry veteran and former CEO and Chair of H20 America and Connecticut Water Service, will serve on the Compensation Committee and the Nominating and Corporate Governance Committee. As a non-employee director he will receive a $110,000 annual cash retainer, $2,000 per meeting above eight annually, and an annual long‑term equity award valued at $175,000, split between performance and restricted stock units and prorated for his initial service period.
Tetra Tech director Kimberly E. Ritrievi reported a series of stock-based compensation transactions in Tetra Tech common stock. On March 16, 2026, she exercised and settled performance and restricted stock units, acquiring 20,968 shares of common stock through derivative exercises coded "M".
According to the footnotes, these shares were earned under the 2018 Equity Incentive Plan as performance stock units that vested between November 23, 2021 and November 18, 2025, were deferred under the Deferred Compensation Plan, and have now settled upon retirement. She also received a new grant of 25,883 restricted stock units (RSUs), each representing one share of common stock.
The RSUs become 100% vested on the first anniversary of the grant date and are exercisable at vesting with no set expiration date. After these transactions, Ritrievi directly owns 192,259 shares of Tetra Tech common stock. No open‑market sales were reported in this filing.
TETRA TECH INC director Christiana Obiaya acquired 495 shares of common stock through the exercise and conversion of restricted stock units (RSUs) on February 19, 2026. The RSUs converted on a one-for-one basis into Tetra Tech common shares at a price of $0.00 per share, bringing her directly held common stock holdings to 9,666 shares after the transaction.
The filing explains that this RSU vesting had originally been scheduled for November 18, 2026, but the vesting was accelerated upon her retirement from the company’s board of directors. The RSUs are exercisable at the time of vesting and do not have a set expiration date, and a remaining balance of 1,469 RSUs was cancelled in connection with her retirement.
Argus Roger R reported acquisition or exercise transactions in this Form 4 filing.
TETRA TECH INC President and CEO Roger R. Argus received a grant of 28,174 restricted stock units (RSUs). Each RSU represents a contingent right to receive one share of Tetra Tech common stock. The RSUs vest 25% on February 19, 2027, and 25% annually thereafter until fully vested. They become exercisable upon vesting and do not have a set expiration date.
Tetra Tech, Inc. reported results of its annual stockholder meeting and a board change. The Board of Directors appointed newly promoted Chief Executive Officer Roger R. Argus as a director, effective immediately, bringing the Board to seven members; he will not serve on any board committees.
Stockholders elected six directors, each receiving strong majority support. They also approved an advisory resolution on named executive officer compensation and an amendment to the Employee Stock Purchase Plan. In addition, stockholders ratified the appointment of PricewaterhouseCoopers LLP as Tetra Tech’s independent registered public accounting firm for fiscal 2026.
Tetra Tech director Kirsten M. Volpi reported exercising a stock option and receiving additional common shares. On February 10, 2026, she exercised an option for 1,000 shares at an exercise price of $9.59 per share, converting it into 1,000 shares of common stock.
After this transaction, she directly holds 70,218 shares of Tetra Tech common stock and 8,000 stock options. The transaction is coded “M,” indicating an exercise or conversion of a derivative security rather than an open‑market purchase or sale.
Tetra Tech, Inc. executive vice president and chief financial officer Steven M. Burdick reported a charitable stock donation. On 02/06/2026, he made a bona fide gift of 11,100 shares of common stock, at a reported price of $0 per share. After this gift, he directly beneficially owns 138,251 shares of Tetra Tech common stock.
Tetra Tech, Inc. senior vice president and corporate controller Brian N. Carter reported an open-market sale of company stock. On February 4, 2026, he sold 9,979 shares of common stock at a weighted average price of $40.225 per share, executed in multiple trades within a narrow price range. After this transaction, he beneficially owns 46,496 shares of Tetra Tech common stock, held directly.
An affiliate of the issuer has filed a notice of proposed sale of 9,979 shares of common stock under Rule 144. The planned sale, through Morgan Stanley Smith Barney LLC Executive Financial Services, has an aggregate market value of $401,400.29 and is expected around February 4, 2026 on the NASDAQ. The shares to be sold were acquired from the issuer as performance shares on various dates in 2024 and 2025. The seller represents that they are not aware of any material adverse, nonpublic information about the issuer’s current or prospective operations.