Ultra Clean COO files initial insider Form 3

Ultra Clean Holdings, Inc. executive Robert Anthony Wunar, the company’s Chief Operating Officer, filed an initial Form 3 to report his beneficial ownership status in the company’s securities.

Accepted by SEC EDGAR 03/31/2026 - 06:03 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Ultra Clean Holdings, Inc. executive Robert Anthony Wunar, the company’s Chief Operating Officer, filed an initial Form 3 to report his beneficial ownership status in the company’s securities. The filing does not report any equity transactions or changes in holdings; it simply establishes his reporting position as an officer.

FAQ

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

What does the Ultra Clean Holdings (UCTT) Form 3 filing report?

The Form 3 reports that Chief Operating Officer Robert Anthony Wunar is now a reporting insider of Ultra Clean Holdings. It serves as an initial statement of beneficial ownership and does not list any transactions or changes in shareholdings.

Who is the reporting person in Ultra Clean Holdings (UCTT) Form 3?

The reporting person is Robert Anthony Wunar, Chief Operating Officer of Ultra Clean Holdings, Inc. As an officer, he must report his beneficial ownership of company securities using Form 3 and subsequent Forms 4 or 5 if transactions occur.

Does the UCTT Form 3 show any stock transactions by Robert Anthony Wunar?

No, this Form 3 does not show any stock purchases, sales, or option exercises. Transaction counts and share amounts in the summary are all zero, indicating only an initial ownership reporting status without activity.

Why is Ultra Clean Holdings (UCTT) required to file a Form 3 for its COO?

Form 3 is required when someone becomes an insider, such as a Chief Operating Officer. It provides the market with an initial view of that person’s beneficial ownership in the company’s securities, even when no transactions are reported yet.

What does a neutral net buy/sell direction mean in the UCTT Form 3 data?

A neutral net buy/sell direction means there were no reportable equity transactions by the insider in this filing. Buy, sell, exercise, gift, tax withholding, and restructuring share counts all appear as zero in the transaction summary.

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

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SEC Form 3

FORM 3

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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Wunar Robert Anthony

(Last) (First) (Middle)

ULTRA CLEAN HOLDINGS, INC.

26462 CORPORATE AVE.

(Street)

HAYWARD CALIFORNIA 94545

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
03/23/2026

3. Issuer Name and Ticker or Trading Symbol
Ultra Clean Holdings, Inc. [ UCTT ]

3a. Foreign Trading Symbol

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

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

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

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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

Exhibit 24 - Power of Attorney

No securities are beneficially owned.

	/s/ Paul Y. Cho, as attorney-in-fact for Robert Anthony Wunar	03/31/2026
	** 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 5 (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.
* Form 3: SEC 1473 (03-26)