[SCHEDULE 13G/A] Ultra Clean Holdings, Inc. SEC Filing

Rhea-AI Filing Summary

Dimensional Fund Advisors LP (DFA) has filed a Schedule 13G indicating that, as of 30 June 2025, it beneficially owns 1,572,330 shares of Boston Omaha Corp ("BOC"), representing 5.1 % of the company’s outstanding common stock. The institutional investor reports sole voting power over 1,540,879 shares and sole dispositive power over the full 1,572,330-share position, with no shared voting or dispositive authority.

DFA, a Delaware limited partnership and SEC-registered investment adviser, explains that the shares are held across multiple mutual funds, commingled trusts and separate accounts for which it or its subsidiaries act as adviser or sub-adviser. While DFA may exercise voting and investment discretion, it expressly disclaims beneficial ownership in excess of the requirements of Section 13(d).

Crossing the 5 % ownership threshold triggers this disclosure and signals a modest increase in institutional ownership in BOC. Because DFA is predominantly a passive, quantitative manager, the filing does not suggest an activist agenda or an intention to influence control. Nevertheless, additional institutional sponsorship can enhance liquidity, broaden research coverage and potentially support the share price through index-related demand.

Key numeric details

• Date of event: 30 June 2025
• Shares owned: 1,572,330
• Percent of class: 5.1 %
• Sole voting power: 1,540,879
• Sole dispositive power: 1,572,330

Overall, the Schedule 13G is an informative but routine ownership disclosure that underscores growing passive interest in Boston Omaha without materially altering corporate governance or near-term strategy.

Positive

• Institutional ownership increases to 5.1 %: Dimensional Fund Advisors’ stake broadens BOC’s shareholder base and may improve trading liquidity.

Negative

• Potential future overhang risk: As a passive manager, DFA could rebalance or exit without strategic considerations, creating sell-side pressure if market conditions dictate.

Insights

Portfolio Manager

TL;DR Passive manager DFA owns 5.1 % of BOC; supports liquidity but unlikely to drive strategic change.

DFA’s 1.57 million-share stake crosses the SEC’s 5 % reporting line. As a quantitative index-oriented adviser, DFA buys for portfolio construction rather than activism. The passive nature limits governance impact, yet higher institutional ownership can narrow bid-ask spreads and reduce volatility. Given Boston Omaha’s market cap around US$700-800 million (not stated in filing, estimate withheld), the position is meaningful but not controlling. I classify the disclosure as moderately positive but not highly impactful for valuation.

Corporate Governance Specialist

TL;DR 5 % threshold reached; no control shift, disclosure mainly improves transparency for investors.

Schedule 13G filings from passive advisers highlight compliance rather than intent to influence. DFA’s disclaimer of beneficial ownership reinforces its non-activist stance. No group formation, subsidiary acquisition or voting agreement is reported. Therefore, board dynamics remain unchanged. The filing’s chief value lies in signalling rising institutional monitoring of BOC, which can enhance governance discipline over time. Impact: neutral to mildly positive.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 3)

Ultra Clean Holdings Inc

(Name of Issuer)

Common Stock

(Title of Class of Securities)

90385V107

(CUSIP Number)

06/30/2025

(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)

SCHEDULE 13G

CUSIP No. 90385V107

1

Names of Reporting Persons

Dimensional Fund Advisors LP

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

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 2,078,715.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 2,139,957.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,139,957.00

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)

4.7 %

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: Dimensional Fund Advisors LP
(b)	Address or principal business office or, if none, residence: 6300 Bee Cave Road, Building One, Austin, TX 78746
(c)	Citizenship: Delaware Limited Partnership
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 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: 2,139,957 ** see Note 1 ** ** Note 1 ** Dimensional Fund Advisors LP, an investment adviser registered under Section 203 of the Investment Advisors Act of 1940, furnishes investment advice to four investment companies registered under the Investment Company Act of 1940, and serves as investment manager or sub-adviser to certain other commingled funds, group trusts and separate accounts (such investment companies, trusts and accounts, collectively referred to as the "Funds"). In certain cases, subsidiaries of Dimensional Fund Advisors LP may act as an adviser or sub-adviser to certain Funds. In its role as investment advisor, sub-adviser and/or manager, Dimensional Fund Advisors LP or its subsidiaries (collectively, "Dimensional") may possess voting and/or investment power over the securities of the Issuer that are owned by the Funds, and may be deemed to be the beneficial owner of the shares of the Issuer held by the Funds. However, all securities reported in this schedule are owned by the Funds. Dimensional disclaims beneficial ownership of such securities. In addition, the filing of this Schedule 13G shall not be construed as an admission that the reporting person or any of its affiliates is the beneficial owner of any securities covered by this Schedule 13G for any other purposes than Section 13(d) of the Securities Exchange Act of 1934.
(b)	Percent of class: 4.7 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 2,078,715** see Note 1 **
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 2,139,957** see Note 1 **
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
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. The Funds described in Note 1 above have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of the securities held in their respective accounts. To the knowledge of Dimensional, the interest of any one such Fund does not exceed 5% of the class of securities. Dimensional Fund Advisors LP disclaims beneficial ownership of all such securities.
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.

Dimensional Fund Advisors LP

Signature:	Selwyn Notelovitz
Name/Title:	Global Chief Compliance Officer
Date:	07/15/2025

FAQ

Why did Dimensional Fund Advisors file a Schedule 13G for Boston Omaha (BOC)?

DFA crossed the 5 % ownership threshold, triggering the SEC’s beneficial-ownership disclosure rule.

How many Boston Omaha shares does Dimensional Fund Advisors own?

The filing states 1,572,330 shares, equal to 5.1 % of outstanding common stock.

Does Dimensional Fund Advisors have voting control over Boston Omaha?

DFA reports sole voting power for 1,540,879 shares and no shared voting authority.

Is Dimensional Fund Advisors pursuing activism at Boston Omaha?

No. The Schedule 13G, rather than a 13D, and explicit disclaimers indicate a passive investment with no intent to influence control.

What is the significance of the 5 % ownership level for investors?

Crossing 5 % requires public disclosure, offering transparency about large holders and often signalling increased institutional attention.

When was the ownership position effective and when was the filing signed?

The relevant event date is 30 June 2025, and the filing was signed on 15 July 2025 by DFA’s Global Chief Compliance Officer.