Ultra Clean Holdings, Inc. SEC filings UCTT
Ultra Clean Holdings, Inc. has 1,000 filings in SEC EDGAR's recent list, going back to Apr 25, 2014. Its latest annual report, Form ARS, was filed on Apr 27, 2026 for the period ended Dec 26, 2025. The latest quarterly report (Form 10-Q) was filed on Oct 28, 2026, covering the quarter ended Sep 25, 2026. The most recent current report (Form 8-K) was filed on Oct 27, 2026 (results of operations). The company's fiscal year ends on December 30.
| Form | Description | Filed | Period |
|---|---|---|---|
| 4 | Insider transaction | Nov 3, 2026 | Oct 30, 2026 |
| 10-Q | Quarterly report | Oct 28, 2026 | Sep 25, 2026 |
| 8-K |
Current report
Results of operations
|
Oct 27, 2026 | Oct 27, 2026 |
| 4 | Insider transaction | Oct 2, 2026 | Sep 30, 2026 |
| 3 | Initial insider ownership | Oct 2, 2026 | Sep 28, 2026 |
| 8-K |
Current report
Officer or director change
|
Sep 30, 2026 | Sep 28, 2026 |
| 4 | Insider transaction | Sep 4, 2026 | Aug 31, 2026 |
| 3 | Initial insider ownership | Sep 4, 2026 | Aug 5, 2026 |
| 4 | Insider transaction | Sep 2, 2026 | Aug 31, 2026 |
| 8-K |
Current report
Material agreement
|
Aug 14, 2026 | Aug 14, 2026 |
| 424B5 | Prospectus supplement | Aug 14, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 13, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 12, 2026 | — |
| 8-K |
Current report
Officer or director change
|
Aug 6, 2026 | Aug 4, 2026 |
| 10-Q | Quarterly report | Aug 4, 2026 | Jun 26, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 3, 2026 | Aug 3, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Jul 31, 2026 | — |
| S-8 | Employee stock plan registration | Jul 10, 2026 | — |
| 8-K |
Current report
Officer or director change
|
Jul 8, 2026 | Jul 2, 2026 |
| 4 | Insider transaction | Jul 7, 2026 | Jul 2, 2026 |
| 144 | Notice of proposed sale | Jul 2, 2026 | — |
| 4 | Insider transaction | Jun 30, 2026 | Jun 26, 2026 |
| 4 | Insider transaction | Jun 9, 2026 | Jun 4, 2026 |
| 4 | Insider transaction | Jun 9, 2026 | Jun 4, 2026 |
| 4 | Insider transaction | Jun 8, 2026 | Jun 4, 2026 |
| 4 | Insider transaction | Jun 4, 2026 | Jun 2, 2026 |
| 144 | Notice of proposed sale | Jun 4, 2026 | — |
| 144 | Notice of proposed sale | Jun 4, 2026 | — |
| 144 | Notice of proposed sale | Jun 2, 2026 | — |
| 4 | Insider transaction | May 27, 2026 | May 22, 2026 |
| 4 | Insider transaction | May 27, 2026 | May 22, 2026 |
| 4 | Insider transaction | May 27, 2026 | May 22, 2026 |
| 4 | Insider transaction | May 27, 2026 | May 22, 2026 |
| 4 | Insider transaction | May 27, 2026 | May 22, 2026 |
| 4 | Insider transaction | May 27, 2026 | May 22, 2026 |
| 4 | Insider transaction | May 27, 2026 | May 22, 2026 |
| 4 | Insider transaction | May 27, 2026 | May 22, 2026 |
| 4 | Insider transaction | May 27, 2026 | May 22, 2026 |
| 4 | Insider transaction | May 27, 2026 | May 22, 2026 |
| 4 | Insider transaction | May 27, 2026 | May 22, 2026 |
| 4 | Insider transaction | May 27, 2026 | May 22, 2026 |
| 4 | Insider transaction | May 27, 2026 | May 22, 2026 |
| 4 | Insider transaction | May 27, 2026 | May 22, 2026 |
| 4 | Insider transaction | May 27, 2026 | May 22, 2026 |
| 4 | Insider transaction | May 27, 2026 | May 22, 2026 |
| 144 | Notice of proposed sale | May 27, 2026 | — |
| SD | Specialized disclosure (conflict minerals) | May 26, 2026 | — |
| 8-K |
Current report
Shareholder vote results
|
May 26, 2026 | May 22, 2026 |
| 4 | Insider transaction | May 18, 2026 | May 14, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| 144 | Notice of proposed sale | May 14, 2026 | — |
| 4 | Insider transaction | May 12, 2026 | May 8, 2026 |
| 4 | Insider transaction | May 12, 2026 | May 8, 2026 |
| 144 | Notice of proposed sale | May 8, 2026 | — |
| 144 | Notice of proposed sale | May 8, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 8, 2026 | — |
| 4 | Insider transaction | May 7, 2026 | May 5, 2026 |
| 4 | Insider transaction | May 7, 2026 | May 5, 2026 |
| 4 | Insider transaction | May 6, 2026 | May 4, 2026 |
| 4 | Insider transaction | May 5, 2026 | May 1, 2026 |
| 144 | Notice of proposed sale | May 5, 2026 | — |
| 4 | Insider transaction | May 4, 2026 | Apr 30, 2026 |
| 4 | Insider transaction | May 4, 2026 | Apr 30, 2026 |
| 4 | Insider transaction | May 4, 2026 | Apr 30, 2026 |
| 4 | Insider transaction | May 4, 2026 | Apr 30, 2026 |
| 4 | Insider transaction | May 4, 2026 | Apr 30, 2026 |
| 4 | Insider transaction | May 4, 2026 | Apr 30, 2026 |
| 144 | Notice of proposed sale | May 4, 2026 | — |
| 144 | Notice of proposed sale | May 4, 2026 | — |
| 10-Q/A | Amended quarterly report | May 1, 2026 | Mar 27, 2026 |
| 144 | Notice of proposed sale | May 1, 2026 | — |
| 144 | Notice of proposed sale | May 1, 2026 | — |
| 10-Q | Quarterly report | Apr 29, 2026 | Mar 27, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 29, 2026 | — |
| 8-K | Current report | Apr 28, 2026 | Apr 28, 2026 |
| 8-K | Current report | Apr 28, 2026 | Apr 28, 2026 |
| ARS | Annual report to shareholders | Apr 27, 2026 | Dec 26, 2025 |
| DEF 14A | Proxy statement | Apr 27, 2026 | May 22, 2026 |
| 8-K |
Current report
Material agreement, New debt
|
Apr 24, 2026 | Apr 23, 2026 |
| 4 | Insider transaction | Apr 2, 2026 | Mar 31, 2026 |
| 3 | Initial insider ownership | Mar 31, 2026 | Mar 23, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 27, 2026 | — |
| 4 | Insider transaction | Mar 3, 2026 | Feb 27, 2026 |
| 8-K |
Current report
Material agreement, New debt, Unregistered share sale
|
Mar 3, 2026 | Feb 26, 2026 |
| 8-K |
Current report
Material agreement, Other events
|
Feb 27, 2026 | Feb 26, 2026 |
| 8-K |
Current report
Other events
|
Feb 25, 2026 | Feb 25, 2026 |
| 10-K | Annual report | Feb 23, 2026 | Dec 26, 2025 |
| 8-K | Current report | Feb 23, 2026 | Feb 23, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 17, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 17, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 12, 2026 | — |
| 8-K |
Current report
Officer or director change
|
Jan 28, 2026 | Jan 25, 2026 |
| 4 | Insider transaction | Dec 5, 2025 | Dec 3, 2025 |
| 4 | Insider transaction | Dec 4, 2025 | Dec 2, 2025 |
| 144 | Notice of proposed sale | Dec 3, 2025 | — |
| 4 | Insider transaction | Nov 28, 2025 | Nov 25, 2025 |
| 10-Q | Quarterly report | Oct 29, 2025 | Sep 26, 2025 |
| 8-K |
Current report
Results of operations, Other events
|
Oct 28, 2025 | Oct 23, 2025 |
| 4 | Insider transaction | Sep 30, 2025 | Sep 26, 2025 |
| 4 | Insider transaction | Sep 16, 2025 | Sep 12, 2025 |
| 3 | Initial insider ownership | Sep 16, 2025 | Sep 2, 2025 |
| 8-K |
Current report
Material agreement, New debt
|
Sep 16, 2025 | Sep 15, 2025 |
| 4 | Insider transaction | Sep 3, 2025 | Aug 29, 2025 |
| 3 | Initial insider ownership | Aug 25, 2025 | Aug 15, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 14, 2025 | — |
| 8-K |
Current report
Officer or director change
|
Aug 7, 2025 | Aug 4, 2025 |
| 10-Q | Quarterly report | Jul 29, 2025 | Jun 27, 2025 |
| 8-K |
Current report
Results of operations
|
Jul 28, 2025 | Jul 28, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jul 15, 2025 | — |
| 4 | Insider transaction | Jul 2, 2025 | Jun 30, 2025 |
| 4 | Insider transaction | Jul 2, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Officer or director change
|
Jun 30, 2025 | Jun 30, 2025 |
| 4 | Insider transaction | Jun 10, 2025 | Jun 6, 2025 |
| 4 | Insider transaction | Jun 6, 2025 | Jun 4, 2025 |
| 144 | Notice of proposed sale | Jun 6, 2025 | — |
| 144 | Notice of proposed sale | Jun 4, 2025 | — |
| 4 | Insider transaction | May 27, 2025 | May 21, 2025 |
| 4 | Insider transaction | May 27, 2025 | May 21, 2025 |
| SD | Specialized disclosure (conflict minerals) | May 27, 2025 | — |
| 8-K |
Current report
Shareholder vote results
|
May 27, 2025 | May 21, 2025 |
| 4 | Insider transaction | May 23, 2025 | May 21, 2025 |
| 4 | Insider transaction | May 23, 2025 | May 21, 2025 |
| 4 | Insider transaction | May 23, 2025 | May 21, 2025 |
| 4 | Insider transaction | May 23, 2025 | May 21, 2025 |
| 4 | Insider transaction | May 23, 2025 | May 21, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2025 | — |
| 4 | Insider transaction | May 8, 2025 | May 6, 2025 |
| 144 | Notice of proposed sale | May 6, 2025 | — |
| 4 | Insider transaction | May 2, 2025 | Apr 30, 2025 |
| 4 | Insider transaction | May 2, 2025 | Apr 30, 2025 |
| 4 | Insider transaction | May 2, 2025 | Apr 30, 2025 |
| 4 | Insider transaction | May 2, 2025 | Apr 30, 2025 |
| 4 | Insider transaction | May 2, 2025 | Apr 30, 2025 |
| 4 | Insider transaction | May 2, 2025 | Apr 30, 2025 |
| 4 | Insider transaction | May 2, 2025 | Apr 30, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 30, 2025 | — |
| 4 | Insider transaction | Apr 29, 2025 | Apr 25, 2025 |
| 4 | Insider transaction | Apr 29, 2025 | Apr 25, 2025 |
| 4 | Insider transaction | Apr 29, 2025 | Apr 25, 2025 |
| 4 | Insider transaction | Apr 29, 2025 | Apr 25, 2025 |
| 4 | Insider transaction | Apr 29, 2025 | Apr 25, 2025 |
| 4 | Insider transaction | Apr 29, 2025 | Apr 25, 2025 |
| 4 | Insider transaction | Apr 29, 2025 | Apr 25, 2025 |
| 4 | Insider transaction | Apr 29, 2025 | Apr 25, 2025 |
| 10-Q | Quarterly report | Apr 29, 2025 | Mar 28, 2025 |
| 8-K |
Current report
Results of operations
|
Apr 28, 2025 | Apr 28, 2025 |
| ARS | Annual report to shareholders | Apr 28, 2025 | Dec 27, 2024 |
| DEF 14A | Proxy statement | Apr 28, 2025 | May 21, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 15, 2025 | — |
| 4 | Insider transaction | Apr 2, 2025 | Mar 31, 2025 |
| 4 | Insider transaction | Apr 2, 2025 | Mar 31, 2025 |
| 4 | Insider transaction | Apr 2, 2025 | Mar 31, 2025 |
| 4 | Insider transaction | Apr 1, 2025 | Mar 28, 2025 |
| 4 | Insider transaction | Mar 11, 2025 | Mar 7, 2025 |
| 4 | Insider transaction | Mar 11, 2025 | Mar 7, 2025 |
| 4 | Insider transaction | Mar 11, 2025 | Mar 7, 2025 |
| 4 | Insider transaction | Mar 11, 2025 | Mar 7, 2025 |
| 4 | Insider transaction | Mar 11, 2025 | Mar 7, 2025 |
| 8-K |
Current report
Officer or director change
|
Mar 5, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 4, 2025 | Feb 28, 2025 |
| 3 | Initial insider ownership | Mar 4, 2025 | Feb 28, 2025 |
| 10-K | Annual report | Feb 25, 2025 | Dec 27, 2024 |
| 8-K |
Current report
Results of operations
|
Feb 24, 2025 | Feb 24, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 14, 2025 | — |
| 10-Q/A | Amended quarterly report | Feb 11, 2025 | Sep 27, 2024 |
| 10-Q/A | Amended quarterly report | Feb 11, 2025 | Mar 29, 2024 |
| 8-K |
Current report
Officer or director change
|
Jan 31, 2025 | Jan 30, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jan 16, 2025 | — |
| 4 | Insider transaction | Jan 3, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Nov 19, 2024 | Nov 15, 2024 |
| 4 | Insider transaction | Nov 15, 2024 | Nov 13, 2024 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 13, 2024 | — |
| 4 | Insider transaction | Nov 12, 2024 | Nov 7, 2024 |
| 144 | Notice of proposed sale | Nov 7, 2024 | — |
| 4 | Insider transaction | Nov 4, 2024 | Oct 31, 2024 |
| 4 | Insider transaction | Nov 4, 2024 | Oct 31, 2024 |
| 10-Q | Quarterly report | Oct 30, 2024 | Sep 27, 2024 |
| 8-K |
Current report
Results of operations
|
Oct 28, 2024 | Oct 28, 2024 |
| 8-K |
Current report
Material agreement, New debt
|
Oct 10, 2024 | Oct 8, 2024 |
| 4 | Insider transaction | Sep 4, 2024 | Aug 31, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Aug 12, 2024 | — |
| 10-Q | Quarterly report | Jul 26, 2024 | Jun 28, 2024 |
| 8-K | Current report | Jul 25, 2024 | Jul 25, 2024 |
| 4 | Insider transaction | Jul 15, 2024 | Jul 11, 2024 |
| 144 | Notice of proposed sale | Jul 12, 2024 | — |
| 4 | Insider transaction | Jul 11, 2024 | Jul 9, 2024 |
| 144 | Notice of proposed sale | Jul 11, 2024 | — |
| 4 | Insider transaction | Jul 10, 2024 | Jul 8, 2024 |
| 144 | Notice of proposed sale | Jul 9, 2024 | — |
| 144 | Notice of proposed sale | Jul 8, 2024 | — |
| 4 | Insider transaction | Jul 3, 2024 | Jul 2, 2024 |
| 4 | Insider transaction | Jul 2, 2024 | Jun 30, 2024 |
| 4 | Insider transaction | Jul 2, 2024 | Jun 28, 2024 |
| 144 | Notice of proposed sale | Jul 2, 2024 | — |
| 3 | Initial insider ownership | Jun 20, 2024 | Jun 10, 2024 |
| 4 | Insider transaction | Jun 11, 2024 | Jun 7, 2024 |
| 144 | Notice of proposed sale | Jun 10, 2024 | — |
| 144 | Notice of proposed sale | Jun 7, 2024 | — |
| SD | Specialized disclosure (conflict minerals) | May 30, 2024 | — |
| 4 | Insider transaction | May 29, 2024 | May 24, 2024 |
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Company profile
- Industry
- Semiconductors & Related Devices (SIC 3674)
- Listed as
- UCTT (Nasdaq)
- Fiscal year ends
- December 30
- Incorporated in
- DE
- Headquarters
- Hayward, CA
- SEC filer status
- Large accelerated filer
- SEC CIK
- 1275014
- Former names
- ULTRA CLEAN HOLDINGS INC (until Feb 17, 2015)
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.