---
schema_version: "secwatch.filing_event.v1"
accession: "0000950103-26-012379"
form_type: "8-K"
ticker: "UCTT"
cik: "0001275014"
company_name: "Ultra Clean Holdings, Inc."
filed_at: "2026-08-14T12:54:31+00:00"
generated_at: "2026-08-14T13:00:07.305717+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Ultra Clean Holdings launches $400M ATM equity offering program

## Summary
- Entered sales agreement with UBS, Barclays, Craig-Hallum, and Oppenheimer for at-the-market sales of up to $400M common stock.
- Sales agents earn commission up to 3.0% of gross proceeds; company reimburses specified expenses.
- Company controls timing and size; no obligation to sell, may suspend or terminate at any time.
- Offered under existing shelf registration (333-278195) with prospectus supplement dated Aug 14, 2026.

## SEC filing metadata
- accession: 0000950103-26-012379
- form_type: 8-K
- ticker: UCTT
- cik: 0001275014
- company_name: Ultra Clean Holdings, Inc.
- filed_at: 2026-08-14T12:54:31+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 1.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1275014/000095010326012379/0000950103-26-012379-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1275014/000095010326012379/dp251729_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950103-26-012379
- JSON: https://secwatch.observer/filing/0000950103-26-012379.json
- Plain text: https://secwatch.observer/filing/0000950103-26-012379.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.