[Form 4] Ultra Clean Holdings, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Seto Jacqueline A. reported acquisition or exercise transactions in this Form 4 filing.

Ultra Clean Holdings, Inc. director Jacqueline A. Seto received an equity award of 2,575 shares of common stock as a grant with no cash paid per share. Following this award, she directly holds 31,525 common shares. The award consists of restricted stock units that vest 100% on the earlier of the day before the next annual stockholder meeting or one year from the grant date.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Seto Jacqueline A.

Role null

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	2,575	$0.00	--

Holdings After Transaction: Common Stock — 31,525 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Equity award size: 2,575 shares Grant price: $0.00 per share Post-transaction holdings: 31,525 shares +1 more

4 metrics

Equity award size 2,575 shares Common stock grant to director on May 22, 2026

Grant price $0.00 per share Stock-based compensation, not an open-market purchase

Post-transaction holdings 31,525 shares Director’s direct ownership after the grant

Vesting condition 100% cliff vest Earlier of day before next annual meeting or 1 year from grant

Key Terms

restricted stock units, Grant, award, or other acquisition, Form 4, common stock

4 terms

restricted stock units financial

"Restricted stock units vest 100% the earlier of the day before the next annual stockholder meeting or 1 year from the date of grant."

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.

Grant, award, or other acquisition financial

"transaction_code_description: Grant, award, or other acquisition"

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

common stock financial

"security_title: Common Stock"

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.

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^*

Seto Jacqueline A.

(Last) (First) (Middle)

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)

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

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(1)	05/22/2026		A		2,575	A	$0	31,525	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 100% the earlier of the day before the next annual stockholder meeting or 1 year from the date of grant.

	/s/ Paul Y. Cho, as attorney-in-fact for Jacqueline A. Seto	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 UCTT director Jacqueline A. Seto report?

Jacqueline A. Seto reported receiving an equity grant of 2,575 shares of Ultra Clean Holdings common stock. The shares were awarded at a price of $0.00 per share as part of her director compensation.

How many UCTT shares does Jacqueline A. Seto hold after this grant?

After the reported grant, Jacqueline A. Seto directly holds 31,525 shares of Ultra Clean Holdings common stock. This figure reflects her updated ownership following the 2,575-share award disclosed in the Form 4 filing.

What are the vesting terms of Jacqueline A. Seto’s restricted stock units at UCTT?

The restricted stock units vest 100% on the earlier of the day before Ultra Clean Holdings’ next annual stockholder meeting or one year from the grant date. This schedule provides a defined timeframe for when the awarded units become fully vested.

Was cash paid for the UCTT shares granted to Jacqueline A. Seto?

No cash was paid for the awarded shares; the grant price was $0.00 per share. The transaction represents a stock-based compensation award rather than an open-market purchase by Jacqueline A. Seto.

Is Jacqueline A. Seto’s UCTT transaction a purchase or a compensation award?

The transaction is a compensation-related award, classified as a “Grant, award, or other acquisition.” It reflects restricted stock units granted to Jacqueline A. Seto in her role as a director, not an open-market share purchase.