Capital World Investors discloses 5.8% Ultra Clean (UCTT) stake in Schedule 13G

Rhea-AI Filing Summary

Capital World Investors filed a Schedule 13G reporting beneficial ownership of Ultra Clean Holdings, Inc. common stock. The firm is deemed to beneficially own 2,580,132 shares, representing 5.8% of the class, based on 44,828,352 shares believed to be outstanding as of June 30, 2026.

Capital World Investors reports sole voting power and sole dispositive power over all 2,580,132 shares, with no shared voting or dispositive power. The filing notes that ownership is held through Capital World Investors as a division of various Capital Group investment management entities, and that SMALLCAP World Fund, Inc. has the right to receive dividends and sale proceeds on more than 5% of the class.

Key Figures

Beneficially owned shares: 2,580,132 shares Percent of class: 5.8% Shares outstanding baseline: 44,828,352 shares +3 more

6 metrics

Beneficially owned shares 2,580,132 shares Shares of Ultra Clean Holdings common stock deemed beneficially owned by Capital World Investors

Percent of class 5.8% Portion of Ultra Clean Holdings common stock class reported as beneficially owned

Shares outstanding baseline 44,828,352 shares Shares of Ultra Clean Holdings common stock believed to be outstanding as of June 30, 2026

Sole voting power 2,580,132 shares Shares over which Capital World Investors has sole power to vote or direct the vote

Sole dispositive power 2,580,132 shares Shares over which Capital World Investors has sole power to dispose or direct disposition

Ownership threshold exceeded More than 5% Schedule 13G filing triggered by ownership of more than 5 percent of the class

Key Terms

Schedule 13G, beneficial owner, sole voting power, sole dispositive power, +1 more

5 terms

Schedule 13G regulatory

"Capital World Investors filed a Schedule 13G reporting beneficial ownership"

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.

beneficial owner financial

"CWI is deemed to be the beneficial owner of 2,580,132 shares"

A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.

sole voting power financial

"Sole Voting Power 2,580,132.00"

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.

sole dispositive power financial

"Sole Dispositive Power 2,580,132.00"

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.

percent of class financial

"Percent of class: 5.8 %"

Percent of class is the portion of a specific category of securities—such as a company’s common shares, preferred shares, or a bond series—that takes part in or approves a corporate action (vote, consent, tender, etc.). Investors watch this number because it reveals how much support or opposition exists within that particular shareholder group; like counting how many members of a club back a proposal, it can determine whether a plan passes or how influence is distributed.

FAQ

What percentage of Ultra Clean Holdings (UCTT) does Capital World Investors own?

Capital World Investors reports beneficial ownership of 5.8% of Ultra Clean Holdings’ common stock, equal to 2,580,132 shares out of 44,828,352 shares believed to be outstanding as of June 30, 2026.

How many UCTT shares does Capital World Investors control voting and disposition for?

Capital World Investors reports sole voting power and sole dispositive power over 2,580,132 shares of Ultra Clean Holdings common stock, with no shared voting or shared dispositive power reported.

What is the significance of the Schedule 13G filed for Ultra Clean Holdings (UCTT)?

The Schedule 13G shows Capital World Investors as a greater than 5% beneficial owner of Ultra Clean Holdings, with 5.8% ownership, indicating a sizable institutional position and control over voting and disposition of those shares.

Who may receive dividends or sale proceeds from the UCTT shares held by Capital World Investors?

The filing states that SMALLCAP World Fund, Inc. is known to have the right to receive dividends from, or the proceeds from the sale of, the reported Ultra Clean Holdings shares relating to more than 5% of the class.

How is Capital World Investors structured in relation to the UCTT share ownership?

Capital World Investors is described as a division of Capital Research and Management Company and affiliated investment management entities, which collectively provide investment management services and are deemed beneficial owners of the 2,580,132 UCTT shares.

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Available on EDGAR 08/12/2026 - 05:41 PM Accepted by SEC EDGAR 08/12/2026 - 05:40 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Ultra Clean Holdings, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

90385V107

(CUSIP Number)

06/30/2026

(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): 90385V107

1

Names of Reporting Persons

Capital World Investors

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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 2,580,132.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 2,580,132.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,580,132.00

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)

5.8 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Ultra Clean Holdings, Inc.
(b)	Address of issuer's principal executive offices: 26462 Corporate Avenue, Hayward, CA 94545
Item 2.
(a)	Name of person filing: Capital World Investors
(b)	Address or principal business office or, if none, residence: 333 SOUTH HOPE STREET, 55TH FLOOR, LOS ANGELES, CALIFORNIA 90071
(c)	Citizenship: N/A
(d)	Title of class of securities: Common Stock
(e)	CUSIP Number(s): 90385V107
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: 2,580,132 ** **Capital World Investors ("CWI") is a division of Capital Research and Management Company ("CRMC"), as well as its investment management subsidiaries and affiliates Capital Bank and Trust Company, Capital International, Inc., Capital International Limited, Capital International Sarl, Capital International K.K., Capital Group Private Client Services, Inc., and Capital Group Investment Management Private Limited (together with CRMC, the "investment management entities"). CWI's divisions of each of the investment management entities collectively provide investment management services under the name "Capital World Investors." CWI is deemed to be the beneficial owner of 2,580,132 shares or 5.8% of the 44,828,352 shares believed to be outstanding.
(b)	Percent of class: 5.8 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 2,580,132
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 2,580,132
	(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. SMALLCAP World Fund, Inc.
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.

Capital World Investors

Signature:	Timothy J. Moon
Name/Title:	Vice President and Senior Counsel, Capital Research and Management Company
Date:	08/11/2026