Thornburg Eric W 4

What Happened

• Eric W. Thornburg, a director of Tetra Tech, was granted 1,259 restricted stock units (RSUs) on April 27, 2026. The RSUs were reported as an award (transaction code A) with an acquisition price of $0.00 (derivative grant).
• Each RSU represents a contingent right to one share of Tetra Tech common stock; the award itself is compensation rather than an open‑market purchase or sale.

Key Details

• Transaction date and price: April 27, 2026; 1,259 RSUs; $0.00 per unit (award).
• Vesting/exercise: RSUs become 100% vested as to the underlying shares on April 27, 2027 (Footnote F2). RSUs are exercisable at vesting and have no set expiration date (Footnote F3).
• Nature of award: RSUs are a derivative grant representing the right to receive shares at vesting (Footnote F1).
• Shares owned after transaction: Not specified in the information provided.
• Filing timeliness: Report filed April 28, 2026 (timely for a Form 4 filing, which is typically due within 2 business days).

Context

• RSU awards are a common form of director compensation and do not reflect an open‑market purchase or sale. They convert into ordinary shares only upon vesting/exercise, so they are not an immediate indication of buying or selling activity.