ULTRA CLEAN HOLDINGS INC

Q: Jun 26 2026

Q: Mar 27 2026

Q: Mar 27 2026

FY: Dec 26 2025

Q: Sep 26 2025

Q: Jun 27 2025

Q: Mar 28 2025

FY: Dec 27 2024

Q: Sep 27 2024

Q: Mar 29 2024

Q: Sep 27 2024

Q: Jun 28 2024

Q: Mar 29 2024

FY: Dec 29 2023

FY: Dec 29 2023

Q: Sep 29 2023

Q: Jun 30 2023

Q: Jun 30 2023

Q: Mar 31 2023

FY: Dec 30 2022

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Entry into a Material Definitive Agreement

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Results of Operations and Financial Condition

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Submission of Matters to a Vote of Security Holders

Financial Statements and Exhibits

Financial Statements and Exhibits

Entry into a Material Definitive Agreement

Entry into a Material Definitive Agreement

Entry into a Material Definitive Agreement

Other Events

Financial Statements and Exhibits

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Results of Operations and Financial Condition

Entry into a Material Definitive Agreement

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Results of Operations and Financial Condition

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Submission of Matters to a Vote of Security Holders

Prospectus Supplement for Primary Offering

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Automatic Shelf Registration

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Prospectus Supplement for Primary Offering

Automatic Shelf Registration

Prospectus Supplement for Primary Offering

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Automatic Shelf Registration

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Notice of Effectiveness

Post-effective amendment to a registration statement

Prospectus Supplement for Primary Offering

Notice of Effectiveness

Registration statement under Securities Act of 1933

Notice of Effectiveness

Post-effective amendment to a registration statement

Prospectus Supplement for Primary Offering

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

DAVERN ALEXANDER M

Xiao Jinsong

Keogh Michael Dennis

Keogh Michael Dennis

Cook Christopher S

Invesco Ltd.

Capital World Investors

VANGUARD CAPITAL MANAGEMENT LLC

HARDING BRIAN E

HARDING BRIAN E

HARDING BRIAN E

Savage Sheri

Savage Sheri

HARDING BRIAN E

Savage Sheri

HARDING BRIAN E

Cho Paul Yoonku

Cho Paul Yoonku

EDMAN THOMAS T

LIGGETT EMILY M

Specialized Disclosure Report

Annual Report Scanned (Paper)

Specialized Disclosure Report

Annual Report Scanned (Paper)

Specialized Disclosure Report

Annual Report Scanned (Paper)

Specialized Disclosure Report

Annual Report Scanned (Paper)

Letter from the SEC

Correspondence with the SEC

Correspondence with the SEC

Letter from the SEC

Specialized Disclosure Report

Specialized Disclosure Report

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Specialized Disclosure Report

Specialized Disclosure Report

Specialized Disclosure Report