Onto Innovation Inc. (NYSE:ONTO) ("Onto Innovation," "Onto," or the "Company") today invites registration for its Company-sponsored analyst event on December 17, 2026 at the New York Stock Exchange, New York, New York.

If you plan to attend in person, please RSVP by December 9 in order to gain access into the NYSE. Register for the event.

Onto Innovation Analyst Event: Momentum Unleashed

The professional investment community is invited to join Onto’s executive management team on Thursday, December 17, 2026, for presentations highlighting key drivers of Onto Innovation’s momentum, including growing market opportunities, winning products and expanding margins, followed by opportunities for direct engagement with technology experts.

9:00 a.m. to 9:30 a.m. ET: Registration and continental breakfast
9:30 a.m. to 1:00 p.m. ET: Presentations, Q&A, and Technology Sessions

Executive team presentations and Q&A featuring Mike Plisinski, CEO; Brian Roberts, CFO; Mike Rosa, CMO; Ramil Yaldaei, COO; and Ido Dolev, EVP Product Solutions.

Luncheon and technology sessions where analysts can engage directly with Onto's technology experts in focused discussions on innovations that address increasingly complex semiconductor manufacturing challenges, including advanced inspection technologies, critical film metrology, X-ray process control for emerging 3D device architectures, and electrical process control solutions.

A live webcast will also be available on the Company’s website at www.ontoinnovation.com, beginning at 9:30 a.m. ET. To listen to the live webcast, please go to the website at least 15 minutes early to register, download and install any necessary audio software.

About Onto Innovation Inc.

Onto Innovation is a leader in process control, combining global scale with an expanded portfolio of leading-edge technologies that include: Un-patterned wafer quality; 3D metrology spanning chip features from nanometer scale transistors to large die interconnects; macro defect inspection of wafers and packages; metal interconnect composition; factory analytics; and lithography for advanced semiconductor packaging.

Our breadth of offerings across the entire semiconductor value chain combined with our connected thinking approach results in a unique perspective to help solve our customers’ most difficult yield, device performance, quality, and reliability issues. Onto Innovation strives to optimize customers’ critical path of progress by making them smarter, faster and more efficient.

Headquartered in Wilmington, Massachusetts, Onto Innovation supports customers with a worldwide sales and service organization. Additional information can be found at www.ontoinnovation.com.

Source: Onto Innovation Inc.

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Sidney Ho, +1 (626) 233-8431

sidney.ho@ontoinnovation.com