Ultra Clean CEO awarded 31,175 restricted shares

Xiao Jinsong reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Xiao Jinsong reported acquisition or exercise transactions in this Form 4 filing.

Ultra Clean Holdings, Inc. Chief Executive Officer Jinsong Xiao received an equity compensation grant of 31,175 shares of common stock on May 22, 2026. The award is in the form of restricted stock units that vest over three years, with equal portions vesting on each anniversary of the May 22, 2026 vesting commencement date.

Following this grant, Xiao directly holds 149,123 shares of Ultra Clean common stock. The grant was recorded at no cash purchase price, reflecting a compensation-related award rather than an open-market share purchase.

Insider Trade Summary

Grant/Award: 31,175 shares

Grant/Award 1 txn

Insider Xiao Jinsong

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	31,175	$0.00	$0.00

Holdings After Transaction: Common Stock — 149,123 shares (Direct)

Footnotes (1)

1. F1. Restricted stock units vest over 3 years with equal parts vesting on each anniversary of the vesting commencement date of May 22, 2026.

Key Figures

Restricted stock unit grant: 31,175 shares Post-transaction holdings: 149,123 shares Grant price per share: $0.00 per share +2 more

5 metrics

Restricted stock unit grant 31,175 shares Equity award to CEO Jinsong Xiao on May 22, 2026

Post-transaction holdings 149,123 shares Common stock directly held by CEO after grant

Grant price per share $0.00 per share Compensation-related award, not an open-market purchase

Vesting period 3 years Restricted stock units vest in three equal annual installments

Vesting commencement date May 22, 2026 Start date for three-year RSU vesting schedule

Key Terms

Restricted stock units, vesting commencement date, grant, award, or other acquisition

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.

vesting commencement date financial

"...on each anniversary of the vesting commencement date of May 22, 2026."

The vesting commencement date is the starting point when an employee begins earning ownership rights to their promised benefits, such as stock options or retirement contributions. Think of it like the day a savings account is opened—only after this date do the benefits start to grow and become fully available over time. It matters to investors because it marks when the clock begins ticking toward full ownership, affecting the timing and value of these benefits.

grant, award, or other acquisition financial

"Transaction code A is described as Grant, award, or other acquisition."

FAQ

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

What insider transaction did Ultra Clean (UCTT) report for CEO Jinsong Xiao?

Ultra Clean reported that CEO Jinsong Xiao received an equity award of 31,175 shares of common stock. The shares were granted as restricted stock units at no cash purchase price and represent compensation rather than an open-market transaction.

How many Ultra Clean (UCTT) shares did the CEO receive in this Form 4 filing?

CEO Jinsong Xiao received 31,175 shares of Ultra Clean common stock in the form of restricted stock units. These units vest over three years, with equal portions vesting on each anniversary of the May 22, 2026 vesting commencement date.

What is the vesting schedule for the Ultra Clean (UCTT) CEO’s new restricted stock units?

The restricted stock units granted to CEO Jinsong Xiao vest over three years. Equal parts vest on each anniversary of the vesting commencement date of May 22, 2026, aligning the award with a multi-year service and performance period.

Did Ultra Clean (UCTT) CEO Jinsong Xiao buy shares on the open market?

No, the Form 4 shows a grant of 31,175 restricted stock units to CEO Jinsong Xiao at a price of $0.00 per share. This is a compensation-related equity award, not an open-market stock purchase or sale transaction.

What are CEO Jinsong Xiao’s Ultra Clean (UCTT) holdings after the reported grant?

After the grant, CEO Jinsong Xiao directly holds 149,123 shares of Ultra Clean common stock. This figure reflects his position following the 31,175-share restricted stock unit award reported in the Form 4 filing.

How is the Form 4 transaction for Ultra Clean (UCTT) classified by the SEC codes?

The transaction is coded "A" for a grant, award, or other acquisition of common stock. It is labeled as a non-derivative acquisition, with the transaction direction identified as an equity grant rather than a purchase or sale in the market.

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

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Accepted by SEC EDGAR 05/27/2026 - 09:50 PM EDT Learn about SEC filing dates

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^*

Xiao Jinsong

(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 Executive 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		31,175(1)	A	$0	149,123	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 Jinsong Xiao	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)