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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
831641	Tetra Tech Inc	TTEK	Services-Engineering Services (8711)	954148514

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1728969	Iii Preston Hopson	3475 East Foothill Blvd. Pasadena CA 91107	Svp, General Counsel	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Acquisiton	2023-11-21	6,326	$0.00	18,288	No	4	A	Direct
Common Stock	Disposition	2023-11-21	2,101	$164.32	16,187	No	4	F	Direct
Common Stock	Disposition	2023-11-21	1,395	$164.13	14,792	No	4	S	Direct
Common Stock	Disposition	2023-11-22	1,050	$165.22	13,742	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	A	Direct
No	4	F	Direct
No	4	S	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)	Acquisiton	2023-11-21	2,186	$0.00	2,186	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
2,186	2024-11-30		No	4	A	Direct

Footnotes

Shares acquired pursuant to vesting of performance stock units (PSUs) earned under 2018 Equity Incentive Plan.
Represents the combined number of shares withheld to pay the related tax liability of the performance stock units that vested on November 21, 2023.
All shares sold at an exact price.
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.
The RSUs become vested as to 25% of the shares on November 30, 2024, and 25% of the shares on each anniversary date thereafter until fully vested.
The RSUs are exercisable at the time of vesting and do not have a set expiration date.