Director Kirsten Volpi exercises 1,000-share option at Tetra Tech (TTEK)

Rhea-AI Filing Summary

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.

Insider Trade Summary

1,000 shares exercised/converted

Mixed 2 txns

Insider Volpi Kirsten M

Role Director

Type	Security	Shares	Price	Value
Exercise	STOCK OPTION (RIGHT TO BUY)	1,000	$0.00	--
Exercise	COMMON STOCK	1,000	$9.59	$10K

Holdings After Transaction: STOCK OPTION (RIGHT TO BUY) — 8,000 shares (Direct); COMMON STOCK — 70,218 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Volpi Kirsten M

(Last) (First) (Middle)

3475 EAST FOOTHILL BOULEVARD

(Street)

PASADENA CA 91107

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
TETRA TECH INC [ TTEK ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
02/10/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
COMMON STOCK	02/10/2026		M		1,000	A	$9.59	70,218	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
STOCK OPTION (RIGHT TO BUY)	$9.59	02/10/2026		M			1,000	11/17/2018(1)	11/18/2027	COMMON STOCK	1,000	$0	8,000	D

Explanation of Responses:

1. The option becomes exercisable as to 100% of the shares on the anniversary of the grant date.

Remarks:

	/s/ Preston Hopson, Attorney-in-fact for Kirsten M. Volpi	02/12/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider transaction did Tetra Tech (TTEK) director Kirsten M. Volpi report?

Kirsten M. Volpi reported exercising a stock option for 1,000 shares. On February 10, 2026, she converted a stock option with a $9.59 exercise price into 1,000 shares of Tetra Tech common stock, classified as a derivative exercise (code M).

How many Tetra Tech (TTEK) shares does Kirsten M. Volpi own after this Form 4?

After the reported transaction, Volpi directly owns 70,218 common shares. The Form 4 shows her beneficial ownership of Tetra Tech common stock increased through the option exercise, and she also continues to hold 8,000 stock options following the transaction.

What does transaction code M mean in the Tetra Tech (TTEK) Form 4 filing?

Code M indicates an exercise or conversion of a derivative security. In this case, a stock option with a $9.59 exercise price was exercised into 1,000 shares of Tetra Tech common stock, rather than being an open‑market buy or sell transaction.

What derivative security did Kirsten M. Volpi exercise in Tetra Tech (TTEK)?

She exercised a stock option (right to buy) for 1,000 shares. The option carried a $9.59 exercise price and was exercisable as to 100% of the shares on the anniversary of the grant date, according to the footnote in the filing.

Does the Tetra Tech (TTEK) Form 4 show an open-market purchase or sale?

No, the filing shows an option exercise, not a market trade. The transaction is coded M, meaning the change in ownership came from converting a stock option into 1,000 common shares at a $9.59 exercise price, not from buying or selling on the market.