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UCTT 424B5: Secondary offering

Ultra Clean Holdings, Inc.

Filed with the SEC on · accession 0000950103-26-012378

UCTT filed a 424B5 (prospectus (offering)) with the SEC on Aug 14, 2026. Ultra Clean Holdings, Inc. filed a prospectus supplement for an at-the-market (ATM) offering of up to $400,000,000 of its common stock, with UBS, Barclays, Craig-Hallum, and Oppenheimer acting as sales agents. The stock moved -8.6% by the first close after the filing.

Summary of the filing

Ultra Clean Holdings, Inc. filed a prospectus supplement for an at-the-market (ATM) offering of up to $400,000,000 of its common stock, with UBS, Barclays, Craig-Hallum, and Oppenheimer acting as sales agents. Proceeds will be used for general corporate purposes, including working capital, product development, and potential acquisitions.

For details, click here →How to read a 424B5 →

Key details

Maximum aggregate offering amount$400.0M
Commission rate$3
IssuerUltra Clean Holdings, Inc.
Sales agent/underwriterUBS Securities LLC
Sales agent/underwriterBarclays Capital Inc.
Sales agent/underwriterCraig-Hallum Capital Group LLC
Sales agent/underwriterOppenheimer & Co. Inc.

How UCTT stock reacted

Close before

$92.91

Aug 13, 2026

First close after

-8.59%

$84.93

5 trading days

-21.42%

$73.01

Since filing

-55.73%

$41.13

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Frequently asked questions

What did UCTT file with the SEC on Aug 14, 2026?

UCTT filed a 424B5 (Secondary offering). Ultra Clean Holdings, Inc. filed a prospectus supplement for an at-the-market (ATM) offering of up to $400,000,000 of its common stock, with UBS, Barclays, Craig-Hallum, and Oppenheimer acting as sales agents. Proceeds will be used for general corporate purposes, including working capital, product development, and potential acquisitions.

What does a secondary offering mean for UCTT stock?

New shares dilute existing holders and are often sold at a discount to the market price.

How do I read a 424B5?

The final terms of an offering of shares or bonds. Look at price, number of shares and the discount to the market price. Large offerings dilute existing shareholders.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A 424B5 (prospectus (offering)): The final terms of an offering of shares or bonds.

How did UCTT stock react to this filing?

UCTT closed at $92.91 before the filing and $84.93 on Aug 14, 2026 (-8.59%). Five trading days later: $73.01 (-21.42%).

Other UCTT SEC filings

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