Form 8-K

8-K — Ultra Clean Holdings, Inc.

Accession: 0001628280-26-038205

Filed: 2026-05-26

Period: 2026-05-22

CIK: 0001275014

SIC: 3674 (SEMICONDUCTORS & RELATED DEVICES)

Item: Submission of Matters to a Vote of Security Holders

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 22, 2026

Ultra Clean Holdings, Inc.

(Exact name of Registrant as Specified in Its Charter)

Delaware 000-50646 61-1430858

(State or Other Jurisdiction

of Incorporation) (Commission File Number) (IRS Employer

Identification No.)

26462 Corporate Avenue

Hayward, California

94545

(Address of Principal Executive Offices) (Zip Code)

Registrant’s Telephone Number, Including Area Code: 510 576-4400

N/A

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading

Symbol(s)

Name of each exchange on which registered

Common Stock, $0.001 par value UCTT The Nasdaq Global Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 5.07 Submission of Matters to a Vote of Security Holders.

On May 22, 2026, at the 2026 Annual Meeting of Stockholders (the “Annual Meeting”) of Ultra Clean Holdings, Inc. (the “Company”), the stockholders of the Company considered and approved three proposals, each of which is described in more detail in the Company’s definitive proxy statement for the Annual Meeting filed with the Securities and Exchange Commission on April 27, 2026.

The vote results detailed below represent the final results as certified by the Inspector of Elections:

Proposal 1

Election of directors for a one-year term.

Director For Against Abstain Broker Non-Votes

Thomas T. Edman 35,583,689 420,800 13,128 4,399,277

James Xiao 35,497,518 506,734 13,365 4,399,277

Clarence L. Granger 35,515,152 489,995 12,470 4,399,277

David T. ibnAle 33,590,773 2,413,324 13,520 4,399,277

Emily M. Liggett 33,594,708 2,411,196 11,713 4,399,277

Ernest E. Maddock 35,812,702 193,074 11,841 4,399,277

Jacqueline A. Seto 35,604,277 401,727 11,613 4,399,277

Joanne Solomon 35,883,333 123,624 10,660 4,399,277

Proposal 2

Ratification of the appointment of PricewaterhouseCoopers LLP to serve as the Company’s independent registered public accounting firm for fiscal 2026.

For Against Abstain

40,130,181 183,200 103,513

Proposal 3

Approval, by non-binding advisory vote, of the compensation paid by the Company to its Named Executive Officers.

For Against Abstain Broker Non-Votes

35,100,113 773,047 144,457 4,399,277

Proposal 4

Approval of the amendment and restatement of the Company’s stock incentive plan (the “Plan”) to increase the number of shares available for issuance under the Plan by an additional 3,500,000 shares.

For Against Abstain Broker Non-Votes

34,373,240 1,526,066 118,311 4,399,277

Proposal 5

Approval of the amendment and restatement of the Company’s employee stock purchase plan (the “ESPP”) to increase the number of shares available for issuance under the ESPP by an additional 450,000 shares.

For Against Abstain Broker Non-Votes

35,885,605 23,182 108,830 4,399,277

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

ULTRA CLEAN HOLDINGS, INC.

Date:

May 26, 2026

By: /s/ Paul Y. Cho

Name: Paul Y. Cho

Title: General Counsel and Corporate Secretary

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Hayward

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