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ONTO INNOVATION INC.

For the period ended Jan 3, 2026. Filed Feb 24, 2026.

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A company's yearly report to the SEC, with audited financial statements. It is the fullest account a company gives of its business, its finances and the risks it sees.

FY2026 · Filed Feb 24, 2026

ONTO$194.04+12.0%Stored close · as of Nov 9, 2026

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Contents

Item 9B. Other Information

Fiscal Year Change

On February 18, 2026, the Board of Directors changed the Company’s fiscal year-end from a 52-53 week fiscal year ending on the Saturday closest to December 31 to a December 31 fiscal year-end. The Company will make the fiscal year change on a prospective basis and will not adjust operating results for prior periods. Additionally, the Company will adopt calendar quarter fiscal period ends commencing with the first quarter ending March 31, 2026. Per SEC guidance, the Company’s change from a 52-53 week fiscal year to a December 31 fiscal year-end is not deemed a change in fiscal year-endfor purposes of reporting subject to Rule 13a-10 or 15d-10 of the Exchange Act. Accordingly, the Company is not required to file a transition report.

Rule 10b5-1 Plan Elections

During the fiscal quarter ended January 3, 2026, none of our directors or officers (as defined in Rule 16a-1 under the Exchange Act) adopted, modified or terminated a “Rule 10b5-1 trading arrangement” or “non-Rule 105b-1 trading arrangement” (as those terms are defined in Item 408 of Regulation S-K).

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The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.