Onto Innovation Director Files Form 144 to Sell $600K in Common Stock Under 10b5-1 Plan

Executive Summary

On September 29, 2026, David B. Miller, a member of the Board of Directors of Onto Innovation Inc. (NYSE: ONTO), filed a Form 144 notice disclosing the intended sale of 2,000 shares of common stock with an estimated aggregate market value of $600,000.00 (approximately $300.00 per share).

Key Transaction Details

• Filer: David B. Miller (Director)
• Security: Common Stock
• Shares Proposed for Sale: 2,000
• Aggregate Value: $600,000.00
• Broker: Morgan Stanley Smith Barney LLC Executive Financial Services
• Approximate Sale Date: September 29, 2026
• Origin of Shares: Acquired as restricted stock directly from the issuer on May 21, 2026
• Trading Plan: The proposed sale is executed pursuant to a pre-arranged Rule 10b5-1 trading plan adopted on June 11, 2026
• Prior Activity: No sales reported in the preceding three months

Market Impact & Significance

The transaction represents approximately 0.004% of Onto Innovation's 49,074,247 outstanding shares. Because the sale volume is negligible relative to the company's total float and was scheduled under a pre-established Rule 10b5-1 plan adopted several months prior, this filing carries Low trading significance and reflects routine insider diversification rather than a shift in fundamental sentiment.