Ultra Clean (UCTT) division president sells 11,478 company shares

Q: What insider activity did UCTT executive Christopher S. Cook report?

Christopher S. Cook reported selling a total of 11,478 shares of Ultra Clean Holdings common stock in open-market transactions on May 4, 2026 . The filing shows two separate sales, each reported with a weighted average price and detailed trading ranges.

Q: At what prices did Christopher S. Cook sell UCTT shares?

Cook’s reported sales used weighted average prices of $73.89 and $74.55 per share. Footnotes state the individual trades occurred in ranges of $73.36–$74.35 and $74.37–$74.905 , reflecting multiple executions within each reported transaction.

Q: How many UCTT shares does Christopher S. Cook own after these sales?

After the reported transactions, Cook beneficially owns 97,427 Ultra Clean Holdings shares directly and 4,100 shares indirectly through a trust. These post-transaction balances come from the share totals listed in the non-derivative and indirect ownership entries.

Q: What was the size of each individual sale by Christopher S. Cook in UCTT?

Cook reported two open-market sales: 10,247 shares of common stock at a weighted average price of $73.89 , and 1,231 shares at a weighted average price of $74.55 . Both are classified as non-derivative common stock transactions.

Q: How are Christopher S. Cook’s indirect UCTT holdings structured?

The filing shows 4,100 shares of Ultra Clean Holdings common stock held indirectly “ by Trust .” This indicates those shares are owned through a trust arrangement, separate from Cook’s 97,427 directly held shares reported in his name.

Filing Impact

(Very High)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

Ultra Clean Holdings, Inc. executive Christopher S. Cook, President of the Products Division, reported open-market sales of a total of 11,478 shares of common stock on May 4, 2026. The transactions were executed at weighted average prices of $73.89 and $74.55 per share.

According to the filing, the shares in each trade were sold in multiple transactions within price ranges of $73.36–$74.35 and $74.37–$74.905. After these sales, Cook holds 97,427 shares directly and 4,100 shares indirectly through a trust.

Insider Trade Summary

Net Seller: 11,478 shares ($848,922)

Net Sell 3 txns

Insider Cook Christopher S

Role President, Products Division

Sold 11,478 shs ($849K)

Type	Security	Shares	Price	Value
Sale	Common Stock	10,247	$73.89	$757K
Sale	Common Stock	1,231	$74.55	$92K
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 98,658 shares (Direct, null); Common Stock — 4,100 shares (Indirect, by Trust)

Footnotes (1)

This is the weighted average sale price. Shares were sold in multiple transactions at prices from $73.3600 to $74.3500. The reporting person undertakes to provide to the issuer, any security holder of the issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (1). This is the weighted average sale price. Shares were sold in multiple transactions at prices from $74.3700 to $74.9050. The reporting person undertakes to provide to the issuer, any security holder of the issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (2).

Key Figures

Total shares sold: 11,478 shares First trade size: 10,247 shares Second trade size: 1,231 shares +4 more

7 metrics

Total shares sold 11,478 shares Open-market sales on May 4, 2026

First trade size 10,247 shares Common stock sold at $73.89 weighted average

Second trade size 1,231 shares Common stock sold at $74.55 weighted average

Direct holdings after 97,427 shares Common stock directly owned post-transaction

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

Price range first sale $73.36–$74.35 Multiple executions within this range

Price range second sale $74.37–$74.905 Multiple executions within this range

Key Terms

open-market sale, weighted average sale price, indirect ownership, nature of ownership, +1 more

5 terms

open-market sale financial

"transaction_action: "open-market sale" for common stock"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

weighted average sale price financial

"This is the weighted average sale price. Shares were sold in multiple transactions"

indirect ownership financial

"ownership_type: "indirect" with nature_of_ownership: "by Trust""

nature of ownership financial

"nature_of_ownership: "by Trust" for indirect common stock holding"

non-derivative financial

"transaction_type: "non-derivative" for common stock sales"

Form 4 Insider Transactions: What Each Field Means →

05/06/2026 - 07:37 PM

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 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)
	President, Products Division

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/04/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	05/04/2026		S		10,247	D	$73.89⁽¹⁾	98,658	D
Common Stock	05/04/2026		S		1,231	D	$74.55⁽²⁾	97,427	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. This is the weighted average sale price. Shares were sold in multiple transactions at prices from $73.3600 to $74.3500. The reporting person undertakes to provide to the issuer, any security holder of the issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (1).

2. This is the weighted average sale price. Shares were sold in multiple transactions at prices from $74.3700 to $74.9050. The reporting person undertakes to provide to the issuer, any security holder of the issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (2).

	/s/ Paul Y. Cho, as attorney-in-fact for Christopher S. Cook	05/06/2026
	** 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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider activity did UCTT executive Christopher S. Cook report?

Christopher S. Cook reported selling a total of 11,478 shares of Ultra Clean Holdings common stock in open-market transactions on May 4, 2026. The filing shows two separate sales, each reported with a weighted average price and detailed trading ranges.

At what prices did Christopher S. Cook sell UCTT shares?

Cook’s reported sales used weighted average prices of $73.89 and $74.55 per share. Footnotes state the individual trades occurred in ranges of $73.36–$74.35 and $74.37–$74.905, reflecting multiple executions within each reported transaction.

How many UCTT shares does Christopher S. Cook own after these sales?

After the reported transactions, Cook beneficially owns 97,427 Ultra Clean Holdings shares directly and 4,100 shares indirectly through a trust. These post-transaction balances come from the share totals listed in the non-derivative and indirect ownership entries.

What was the size of each individual sale by Christopher S. Cook in UCTT?

Cook reported two open-market sales: 10,247 shares of common stock at a weighted average price of $73.89, and 1,231 shares at a weighted average price of $74.55. Both are classified as non-derivative common stock transactions.

How are Christopher S. Cook’s indirect UCTT holdings structured?

The filing shows 4,100 shares of Ultra Clean Holdings common stock held indirectly “by Trust.” This indicates those shares are owned through a trust arrangement, separate from Cook’s 97,427 directly held shares reported in his name.