Kimberly E. Ritrievi - 16 Mar 2026 Form 4 Insider Report for TETRA TECH INC (TTEK)

Role
Director
Signature
/s/ Preston Hopson, Attorney-in-fact for Kimberly E. Ritrievi
Issuer symbol
TTEK
Transactions as of
16 Mar 2026
Net transactions value
$0
Form type
4
Filing time
18 Mar 2026, 20:43:25 UTC
Previous filing
14 Jan 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Ritrievi Kimberly E Director 3475 EAST FOOTHILL BOULEVARD, PASADENA /s/ Preston Hopson, Attorney-in-fact for Kimberly E. Ritrievi 18 Mar 2026 0001592089

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction TTEK COMMON STOCK Options Exercise +4,500 +3.1% $0.000000* 149,908 16 Mar 2026 Direct
transaction TTEK COMMON STOCK Options Exercise +2,250 +1.5% $0.000000* 152,158 16 Mar 2026 Direct
transaction TTEK COMMON STOCK Options Exercise +1,925 +1.3% $0.000000* 154,083 16 Mar 2026 Direct
transaction TTEK COMMON STOCK Options Exercise +2,910 +1.9% $0.000000* 156,993 16 Mar 2026 Direct
transaction TTEK COMMON STOCK Options Exercise +2,050 +1.3% $0.000000* 159,043 16 Mar 2026 Direct
transaction TTEK COMMON STOCK Options Exercise +795 +0.5% $0.000000* 159,838 16 Mar 2026 Direct
transaction TTEK COMMON STOCK Options Exercise +795 +0.5% $0.000000* 160,633 16 Mar 2026 Direct
transaction TTEK COMMON STOCK Options Exercise +1,900 +1.2% $0.000000* 162,533 16 Mar 2026 Direct
transaction TTEK COMMON STOCK Options Exercise +2,125 +1.3% $0.000000* 164,658 16 Mar 2026 Direct
transaction TTEK COMMON STOCK Options Exercise +1,718 +1% $0.000000* 166,376 16 Mar 2026 Direct
transaction TTEK COMMON STOCK Award +25,883 +16% $0.000000* 192,259 16 Mar 2026 Direct F1

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction TTEK RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) Options Exercise -4,500 -100% $0.000000* 0 16 Mar 2026 COMMON STOCK 4,500 Direct F2, F3, F4
transaction TTEK RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) Options Exercise -2,250 -50% $0.000000* 2,250 16 Mar 2026 COMMON STOCK 2,250 Direct F2, F3, F4
transaction TTEK RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) Options Exercise -1,925 -50% $0.000000* 1,925 16 Mar 2026 COMMON STOCK 1,925 Direct F2, F3, F4
transaction TTEK RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) Options Exercise -2,910 -100% $0.000000* 0 16 Mar 2026 COMMON STOCK 2,910 Direct F2, F3, F4
transaction TTEK RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) Options Exercise -2,050 -100% $0.000000* 0 16 Mar 2026 COMMON STOCK 2,050 Direct F2, F3, F4, F5
transaction TTEK RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) Options Exercise -795 -100% $0.000000* 0 16 Mar 2026 COMMON STOCK 795 Direct F2, F3, F4, F6
transaction TTEK RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) Options Exercise -795 -100% $0.000000* 0 16 Mar 2026 COMMON STOCK 795 Direct F2, F3, F4, F6
transaction TTEK RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) Options Exercise -1,900 -100% $0.000000* 0 16 Mar 2026 COMMON STOCK 1,900 Direct F2, F3, F4, F7
transaction TTEK RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) Options Exercise -2,125 -100% $0.000000* 0 16 Mar 2026 COMMON STOCK 2,125 Direct F2, F3, F4, F8
transaction TTEK RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) Options Exercise -1,718 -100% $0.000000* 0 16 Mar 2026 COMMON STOCK 1,718 Direct F2, F3, F4
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Kimberly E. Ritrievi is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may continue.

Explanation of Responses:

Id Content
F1 Shares acquired pursuant to vesting of performance stock units ("PSU") earned under 2018 Equity Incentive Plan. The PSUs vested between 11/23/2021 and 11/18/2025 but were deferred under the Issuer's Deferred Compensation Plan and have settled upon retirement.
F2 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.
F3 The RSUs become 100% vested as to the shares underlying the RSUs on the first anniversary date.
F4 The RSUs are exercisable at the time of vesting and do not have a set expiration date.
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 On September 6, 2024, the balance of 159 shares was updated pursuant to a 5 to 1 forward stock split, resulting in an additional 636 shares of common stock.
F7 On September 6, 2024, the balance of 380 shares was updated pursuant to a 5 to 1 forward stock split, resulting in an additional 1,520 shares of common stock.
F8 On September 6, 2024, the balance of 425 shares was updated pursuant to a 5 to 1 forward stock split, resulting in an additional 1,700 shares of common stock.