Ultra Clean (UCTT) Products Division president granted 13,196 stock units

Rhea-AI Filing Summary

Cook Christopher S reported acquisition or exercise transactions in this Form 4 filing.

Ultra Clean Holdings, Inc. reported that Christopher S. Cook, President of the Products Division, received a grant of 13,196 shares of common stock at a price of $0.00 per share as a compensation-related award. After this grant, he directly holds 110,623 shares of common stock and indirectly holds 4,100 shares through a trust. A related footnote explains that the restricted stock units underlying this award vest over three years, with equal portions vesting on each anniversary of the vesting commencement date of May 22, 2026.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Cook Christopher S

Role President, Products Division

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	13,196	$0.00	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 110,623 shares (Direct, null); Common Stock — 4,100 shares (Indirect, by Trust)

Footnotes (1)

1. [object Object]

Key Figures

Stock grant size: 13,196 shares Grant price: $0.00 per share Direct holdings after grant: 110,623 shares +3 more

6 metrics

Stock grant size 13,196 shares Grant, award, or other acquisition on May 22, 2026

Grant price $0.00 per share Compensation-related award of common stock

Direct holdings after grant 110,623 shares Common stock held directly following transaction

Indirect holdings by trust 4,100 shares Common stock held indirectly through a trust

Vesting period 3 years Restricted stock units vest in equal parts annually

Vesting commencement date May 22, 2026 Anniversary dates used for RSU vesting schedule

Key Terms

restricted stock units, grant, award, or other acquisition, indirect ownership, by Trust, +1 more

5 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.

grant, award, or other acquisition financial

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

indirect ownership financial

""ownership_type": "indirect""

by Trust financial

""nature_of_ownership": "by Trust""

President, Products Division financial

""officer_title": "President, Products Division""

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^*

Cook Christopher S

(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)
	President, Products Division

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		13,196(1)	A	$0	110,623	D
Common Stock								4,100	I	by Trust

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 Christopher S. Cook	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 executive Christopher Cook report?

Christopher S. Cook reported an acquisition of 13,196 shares of Ultra Clean Holdings common stock as a grant or award at $0.00 per share. This is a compensation-related transaction rather than an open-market purchase or sale.

How many Ultra Clean Holdings (UCTT) shares does Christopher Cook now hold?

Following the reported grant, Christopher S. Cook directly holds 110,623 shares of Ultra Clean Holdings common stock and indirectly holds 4,100 shares through a trust. These holdings reflect his equity position after the May 22, 2026 transaction.

What are the vesting terms of Christopher Cook’s UCTT restricted stock units?

The restricted stock units vest over three years, with equal parts vesting on each anniversary of the vesting commencement date of May 22, 2026. This schedule means the award converts into shares gradually over that three-year period.

Was Christopher Cook’s Ultra Clean Holdings transaction a market buy or sell?

No, the filing shows a grant or award acquisition of 13,196 shares at $0.00 per share, not an open-market buy or sell. It reflects equity compensation, coded as a grant rather than a purchase or sale transaction.

How is Christopher Cook’s indirect ownership in UCTT shares structured?

The Form 4 shows 4,100 shares of Ultra Clean Holdings common stock held indirectly by a trust. This indicates those shares are owned through a trust structure, rather than in his direct personal brokerage or account.