Director Christiana Obiaya acquires 495 Tetra Tech (TTEK) shares on RSU vesting, retires from board

Rhea-AI Filing Summary

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.

Insider Trade Summary

495 shares exercised/converted

Mixed 2 txns

Insider Obiaya Christiana

Role Director

Type	Security	Shares	Price	Value
Exercise	RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)	495	$0.00	--
Exercise	COMMON STOCK	495	$0.00	--

Holdings After Transaction: RESTRICTED STOCK UNITS (RIGHT TO RECEIVE) — 0 shares (Direct); COMMON STOCK — 9,666 shares (Direct)

Footnotes (1)

1. 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. Vesting of the RSUs, which was initially scheduled for November 18, 2026, was accelerated on the Reporting Person's retirement from the Issuer's board of directors. The RSUs are exercisable at the time of vesting and do not have a set expiration date. Balance of 1,469 RSUs were cancelled upon retirement.

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

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X

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^*

Obiaya Christiana

(Last) (First) (Middle)

3475 E. FOOTHILL BLVD.

(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)
02/19/2026

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	02/19/2026		M		495	A	$0	9,666	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
RESTRICTED STOCK UNITS (RIGHT TO RECEIVE)	(1)	02/19/2026		M			495	11/30/2026(2)	(3)	COMMON STOCK	495	$0	0(4)	D

Explanation of Responses:

1. 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.

2. Vesting of the RSUs, which was initially scheduled for November 18, 2026, was accelerated on the Reporting Person's retirement from the Issuer's board of directors.

3. The RSUs are exercisable at the time of vesting and do not have a set expiration date.

4. Balance of 1,469 RSUs were cancelled upon retirement.

Remarks:

	/s/ Preston Hopson, Attorney-in-Fact for Christiana Obiaya	02/20/2026
	** 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 INC (TTEK) director Christiana Obiaya report?

Christiana Obiaya reported acquiring 495 shares of Tetra Tech common stock via the exercise and conversion of restricted stock units on February 19, 2026. This was recorded as a derivative exercise, not an open-market purchase, and increased her directly held common shares to 9,666.

How many TTEK shares does Christiana Obiaya hold after this Form 4 transaction?

After the reported transaction, Christiana Obiaya directly holds 9,666 shares of Tetra Tech common stock. These shares resulted in part from the conversion of 495 restricted stock units, which vested and converted into common stock at a price of $0.00 per share.

Were Christiana Obiaya’s TTEK restricted stock units related to her board retirement?

Yes. The vesting of her restricted stock units, originally scheduled for November 18, 2026, was accelerated upon her retirement from Tetra Tech’s board of directors. In connection with this retirement, a remaining balance of 1,469 RSUs was cancelled and did not convert into common shares.

What does the Form 4 say about the terms of Christiana Obiaya’s TTEK RSUs?

The Form 4 notes that each restricted stock unit represented a contingent right to receive one share of Tetra Tech common stock. The RSUs became exercisable at the time of vesting, have no set expiration date, and were converted into common shares at a price of $0.00 per share.

Did Christiana Obiaya buy or sell TTEK shares on the open market in this filing?

No open-market purchases or sales were reported. The Form 4 reflects an exercise and conversion of restricted stock units into 495 shares of common stock at $0.00 per share, categorized as an acquisition through derivative exercise rather than a market trade.