Ultra Clean Holdings, Inc.

UCTT·NASDAQ·$87.46Share Price as of 11/2·$4BMarket Cap as of 11/2

Financials

10-QQ3 ended 09/25/2610/28/26 10-QQ2 ended 06/26/2608/04/26 10-Q/AQ1 ended 03/27/2605/01/26 10-QQ1 ended 03/27/2604/29/26 10-KFY 202502/23/26

Disclosures

8-KCurrent report10/27/26 8-KCurrent report09/30/26 8-KCurrent report08/14/26 8-KCurrent report08/06/26 8-KCurrent report08/03/26

Prospectuses and Registrations

424B5Prospectus supplement08/14/26 S-8Registration of securities for employees07/10/26 S-3ASRAutomatic shelf registration03/25/24 S-8Registration of securities for employees03/20/24 424B5Prospectus supplement04/09/21

Proxies

DEF 14ADefinitive proxy04/27/26 DEF 14ADefinitive proxy04/28/25 DEF 14ADefinitive proxy04/26/24 DEFA14AAdditional proxy materials05/01/23 DEF 14ADefinitive proxy04/21/23

Ownership

Form 3Initial insider ownership10/02/26 Form 4Insider transaction10/02/26 Form 3Initial insider ownership09/04/26 Form 4Insider transaction09/04/26 Form 4Insider transaction09/02/26

Other

SDConflict Minerals disclosure05/26/26 ARSAnnual report to shareholders04/27/26 SDConflict Minerals disclosure05/27/25 ARSAnnual report to shareholders04/28/25 SDConflict Minerals disclosure05/30/24