Vanguard Holds 5.23% of Tetra Tech via Schedule 13G

Rhea-AI Filing Summary

Tetra Tech Inc reports that Vanguard Capital Management holds 13,656,856 shares of Common Stock, representing 5.23% of the class, as reported on the Schedule 13G. The filing shows Vanguard has sole dispositive power for 13,656,856 shares and sole voting power for 1,947,705 shares. The Schedule 13G discloses these holdings are reported on behalf of multiple Vanguard investment vehicles and affiliates; the signing date is 04/30/2026.

Insights

Institutional Ownership Analyst

Vanguard reported a >5% passive stake in Tetra Tech, disclosed via Schedule 13G.

Vanguard Capital Management reports beneficial ownership of 13,656,856 shares (5.23%), with sole dispositive power over those shares and sole voting power over 1,947,705 shares. The filing attributes holdings to Vanguard investment funds and affiliated advisory units.

Because this is a Schedule 13G, the position is presented as passive; subsequent filings (e.g., a Schedule 13D or Form 13F) would be needed to show activist intent or trading activity.

Key Figures

Shares beneficially owned: 13,656,856 shares Percent of class: 5.23% Sole voting power: 1,947,705 shares +4 more

7 metrics

Shares beneficially owned 13,656,856 shares Schedule 13G reporting

Percent of class 5.23% Percent of common stock class

Sole voting power 1,947,705 shares Sole power to vote or direct the vote

Sole dispositive power 13,656,856 shares Sole power to dispose or direct disposition

Report type Schedule 13G Passive investor disclosure

Reporting period/date shown 03/31/2026 Reporting date on cover

Signing date 04/30/2026 Signature date by Vanguard representative

Key Terms

Schedule 13G, Beneficially owned, Sole dispositive power, Sole voting power

4 terms

Schedule 13G regulatory

"Schedule 13G reporting beneficial ownership greater than 5%"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

Beneficially owned financial

"Amount beneficially owned: 13656856"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

Sole dispositive power regulatory

"Sole power to dispose or to direct the disposition of: 13656856"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

Sole voting power regulatory

"Sole power to vote or to direct the vote: 1947705"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What stake does Vanguard Capital Management report in TTEK?

Vanguard reports beneficial ownership of 13,656,856 shares, representing 5.23% of Tetra Tech's common stock. The filing lists sole dispositive power over those shares and sole voting power over 1,947,705 shares.

Which filing discloses Vanguard's TTEK holdings?

The position is disclosed on a Schedule 13G, a passive investor disclosure form. The Schedule 13G lists holdings as of 03/31/2026 and is signed on 04/30/2026 by a Vanguard representative.

Are Vanguard's shares held on behalf of funds or clients?

Yes. The filing states holdings are reported by Vanguard Capital Management on behalf of Vanguard funds and other managed accounts, including named affiliated advisory units, which exercise dispositive power over the securities.

Does this Schedule 13G indicate activist intent?

No. A Schedule 13G is used for passive investors; the filing does not assert activist intent. Any change to activist involvement would typically be disclosed via a Schedule 13D or other filings.

How much voting power does Vanguard have in TTEK?

Vanguard reports sole voting power for 1,947,705 shares and shared voting power of 0. The filing separates voting power from dispositive power for clarity.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 04/30/2026 - 02:01 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Tetra Tech Inc

(Name of Issuer)

Common Stock

(Title of Class of Securities)

88162G103

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 88162G103

1

Names of Reporting Persons

Vanguard Capital Management

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

PENNSYLVANIA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 1,947,705.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 13,656,856.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

13,656,856.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.23 %

12

Type of Reporting Person (See Instructions)

IA

Comment for Type of Reporting Person: In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by Vanguard Capital Management LLC and the following affiliates of Vanguard Capital Management LLC or business divisions of such affiliates: Vanguard Asset Management Limited, Vanguard Fiduciary Trust Company, Vanguard Global Advisers, LLC and Vanguard Investments Australia Ltd. This Schedule 13G includes securities held by Vanguard funds, or sleeves thereof, over which Vanguard Capital Management LLC exercises dispositive power, in addition to securities held by clients over which the affiliates or business divisions of such affiliates indicated above exercise dispositive and/or voting power. This Schedule 13G does not include securities, if any, beneficially owned by other subsidiaries or affiliates of Vanguard Capital Management LLC, or business divisions of such subsidiaries, whose ownership of securities is disaggregated from that of the reporting business unit in accordance with such release.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Tetra Tech Inc
(b)	Address of issuer's principal executive offices: 3475 East Foothill Blvd, Pasadena, CA, 91107
Item 2.
(a)	Name of person filing: Vanguard Capital Management
(b)	Address or principal business office or, if none, residence: 100 Vanguard Blvd,, Malvern, PA, 19355
(c)	Citizenship: PA
(d)	Title of class of securities: Common Stock
(e)	CUSIP Number(s): 88162G103
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 13656856
(b)	Percent of class: 5.23 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 1947705
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 13656856
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. Vanguard Capital Management, including investment companies registered under the Investment Company Act of 1940 and other managed accounts, have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the securities reported herein.No one other person's interest in the securities reported herein is more than 5%.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Vanguard Capital Management

Signature:	Ashley Grim
Name/Title:	Head of Global Fund Administration
Date:	04/30/2026