Ultra Clean (UCTT) COO receives 10,732 restricted stock units

Rhea-AI Filing Summary

Wunar Robert Anthony reported acquisition or exercise transactions in this Form 4 filing.

Ultra Clean Holdings, Inc. reported that Chief Operating Officer Robert Anthony Wunar received a grant of 10,732 shares of Common Stock, reflected as an award at a price of $0.00 per share. Following this grant, he directly holds 10,732 shares.

A footnote explains that these are restricted stock units that vest over three years, with equal portions vesting on each anniversary of the vesting commencement date of May 22, 2026. This is a compensation-related equity award rather than an open‑market purchase or sale.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Wunar Robert Anthony

Role Chief Operating Officer

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	10,732	$0.00	--

Holdings After Transaction: Common Stock — 10,732 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Equity award: 10,732 shares Grant price: $0.0000 per share Post‑grant holdings: 10,732 shares +2 more

5 metrics

Equity award 10,732 shares Grant of Common Stock to COO on May 22, 2026

Grant price $0.0000 per share Recorded transaction price for the equity award

Post‑grant holdings 10,732 shares Total Common Stock directly held after the transaction

Vesting schedule 3 years Restricted stock units vest in equal parts over three years

Vesting start date May 22, 2026 Vesting commencement date for the RSUs

Key Terms

Restricted stock units, vest over 3 years, Chief Operating Officer

3 terms

Restricted stock units financial

"Restricted stock units vest over 3 years with equal parts vesting..."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

vest over 3 years financial

"Restricted stock units vest over 3 years with equal parts vesting..."

Chief Operating Officer financial

"officer_title": "Chief Operating Officer""

A chief operating officer (COO) is a senior executive responsible for overseeing the day-to-day activities of a company, ensuring that all parts of the organization work smoothly and efficiently. They often act like a company's operational quarterback, translating strategic plans into practical actions. For investors, the COO's effectiveness can influence a company's performance and stability, making them an important figure in assessing the company's management strength.

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

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

Wunar Robert Anthony

(Last) (First) (Middle)

ULTRA CLEAN HOLDINGS, INC.

26462 CORPORATE AVE

(Street)

HAYWARD CALIFORNIA 94545

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/22/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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

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	05/22/2026		A		10,732(1)	A	$0	10,732	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

Explanation of Responses:

1. Restricted stock units vest over 3 years with equal parts vesting on each anniversary of the vesting commencement date of May 22, 2026.

	/s/ Paul Y. Cho, as attorney-in-fact for Robert Wunar	05/27/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Ultra Clean (UCTT) report for its COO?

Ultra Clean reported that its Chief Operating Officer, Robert Anthony Wunar, received an award of 10,732 shares of Common Stock. The grant is recorded at $0.00 per share and represents equity compensation rather than an open‑market stock purchase.

How many Ultra Clean (UCTT) shares were granted to the COO in this Form 4?

The Form 4 shows a grant of 10,732 shares of Ultra Clean common stock to COO Robert Anthony Wunar. After this transaction, his directly held position is 10,732 shares, reflecting a new equity award rather than a change from buying or selling in the market.

Are the Ultra Clean (UCTT) shares granted to the COO immediately vested?

No, the award consists of restricted stock units that vest over three years. Equal portions vest on each anniversary of the vesting commencement date of May 22, 2026, so the COO’s ability to access the full award is spread over that period.

Was cash paid for the Ultra Clean (UCTT) shares received by the COO?

No cash was paid for this grant; the transaction price is listed as $0.00 per share. The Form 4 characterizes it as a grant or award of equity compensation, not a purchase, meaning it is part of the executive’s compensation package.

Does this Ultra Clean (UCTT) Form 4 show any insider share sales?

The Form 4 does not show any sales; it reports only an acquisition classified as a grant or award. Transaction summaries indicate one acquire transaction and zero sales, exercises, gifts, or tax‑withholding events in the reported period.