Ultra Clean CAO granted 8,412-share stock award

HARDING BRIAN E reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

HARDING BRIAN E reported acquisition or exercise transactions in this Form 4 filing.

Ultra Clean Holdings, Inc. disclosed that Chief Accounting Officer Brian E. Harding received an award of 8,412 shares of common stock on May 22, 2026 at no cash cost. This equity award is in the form of restricted stock units that vest in three equal parts on each anniversary of the vesting commencement date of May 22, 2026. Following the grant, Harding directly holds 45,043 shares of the company’s common stock.

Insider Trade Summary

Grant/Award: 8,412 shares

Grant/Award 1 txn

Insider HARDING BRIAN E

Role Chief Accounting Officer

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	8,412	$0.00	$0.00

Holdings After Transaction: Common Stock — 45,043 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

Equity award size: 8,412 shares Transaction price per share: $0.0000 Shares held after grant: 45,043 shares +2 more

5 metrics

Equity award size 8,412 shares Common stock granted as restricted stock units on May 22, 2026

Transaction price per share $0.0000 Grant/award acquisition of common stock

Shares held after grant 45,043 shares Direct ownership following the May 22, 2026 award

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

Vesting start date May 22, 2026 Vesting commencement date for the restricted stock units

Key Terms

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

4 terms

Restricted stock units financial

"Restricted stock units vest over 3 years with equal parts vesting on each anniversary"

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

"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_description: Grant, award, or other acquisition"

Chief Accounting Officer financial

"Brian E. Harding is the company’s Chief Accounting Officer"

A chief accounting officer is a senior executive responsible for overseeing a company's financial records and ensuring all accounting practices are accurate and compliant with regulations. They play a key role in preparing financial reports that help investors understand the company's financial health, much like a trusted navigator guiding a ship through complex waters. Their work ensures transparency and trust in the company's financial information.

FAQ

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

What did Ultra Clean Holdings (UCTT) disclose in this Form 4 filing?

Ultra Clean Holdings reported that Chief Accounting Officer Brian E. Harding received a grant of 8,412 shares of common stock as restricted stock units, which vest over three years beginning May 22, 2026, increasing his direct holdings to 45,043 shares.

How many Ultra Clean Holdings (UCTT) shares were granted to Brian E. Harding?

Brian E. Harding was granted 8,412 shares of Ultra Clean Holdings common stock. These shares are structured as restricted stock units that vest in three equal annual installments, starting on May 22, 2026, subject to the stated vesting schedule.

What is Brian E. Harding’s share ownership after this Ultra Clean Holdings grant?

After receiving the 8,412-share award, Brian E. Harding directly holds 45,043 shares of Ultra Clean Holdings common stock. This figure reflects his updated ownership position immediately following the reported grant on May 22, 2026.

How do the granted restricted stock units in UCTT’s filing vest over time?

The restricted stock units vest over three years, with equal portions vesting on each anniversary of the vesting commencement date of May 22, 2026. This means one-third vests each year, subject to the specified schedule.

Did Brian E. Harding pay a purchase price for the Ultra Clean Holdings shares granted?

No cash purchase price was paid for this grant. The Form 4 shows a transaction price per share of $0.0000, indicating the 8,412-share award was provided as equity compensation rather than an open-market purchase.

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

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Accepted by SEC EDGAR 05/27/2026 - 09:44 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^*

HARDING BRIAN E

(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 Accounting 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		8,412(1)	A	$0	45,043	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 Brian E. Harding	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)