Ultra Clean (UCTT) General Counsel receives 8,041-share equity award

Rhea-AI Filing Summary

Ultra Clean Holdings, Inc. reported that its General Counsel and Secretary, Paul Yoonku Cho, received an equity compensation grant. On May 22, 2026, he was awarded 8,041 shares of Common Stock at no cash cost, classified as a grant or award acquisition.

Following this transaction, Cho directly holds 23,885 shares of the company’s Common Stock. A related footnote explains that the award consists of restricted stock units that vest over three years, with equal portions vesting on each anniversary of the May 22, 2026 vesting commencement date.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Cho Paul Yoonku

Role General Counsel and Secretary

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	8,041	$0.00	--

Holdings After Transaction: Common Stock — 23,885 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Equity grant size: 8,041 shares Transaction price: $0.00 per share Shares held after grant: 23,885 shares +2 more

5 metrics

Equity grant size 8,041 shares Common Stock grant on May 22, 2026

Transaction price $0.00 per share Compensation grant, not open-market purchase

Shares held after grant 23,885 shares Direct ownership following transaction

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

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

Key Terms

Restricted stock units, Common Stock, Grant, award, or other acquisition, Direct ownership

4 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.

Common Stock financial

"security_title: "Common Stock" in the non-derivative transaction entry"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Grant, award, or other acquisition financial

"transaction_code_description: "Grant, award, or other acquisition""

Direct ownership financial

"ownership_type: "direct" and ownership_code: "D""

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^*

Cho Paul Yoonku

(Last) (First) (Middle)

C/O ULTRA CLEAN HOLDINGS, INC.

26462 CORPORATE AVENUE

(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)
	General Counsel and Secretary

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		8,041(1)	A	$0	23,885	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 Yoonku Cho	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 did Ultra Clean Holdings (UCTT) disclose in this Form 4?

Ultra Clean Holdings disclosed that General Counsel and Secretary Paul Yoonku Cho received a grant of 8,041 shares of Common Stock as equity compensation, increasing his direct holdings to 23,885 shares following the award.

How many Ultra Clean Holdings (UCTT) shares were granted to Paul Yoonku Cho?

Paul Yoonku Cho was granted 8,041 shares of Ultra Clean Holdings Common Stock. The award was recorded at a per-share transaction price of $0.00, indicating it was a compensation grant rather than an open-market purchase.

What are Paul Yoonku Cho’s Ultra Clean Holdings (UCTT) holdings after this grant?

After the grant, Paul Yoonku Cho directly holds 23,885 shares of Ultra Clean Holdings Common Stock. This total includes the recently awarded 8,041-share grant reported in the Form 4 insider transaction filing.

How do the restricted stock units for UCTT’s General Counsel vest?

The restricted stock units awarded to Ultra Clean’s General Counsel vest over three years. Equal portions vest on each anniversary of the vesting commencement date of May 22, 2026, creating a multi-year incentive schedule tied to continued service.

Was cash paid for the Ultra Clean Holdings (UCTT) shares granted to Paul Yoonku Cho?

No cash was paid for this grant. The Form 4 lists a transaction price per share of $0.00, confirming the 8,041-share award was a compensation-related grant, not an open-market purchase of Ultra Clean Holdings stock.