Onto Innovation is a leading semiconductor process-control company. The company develops optical metrology, defect-inspection, lithography, and advanced packaging measurement systems together with smart-manufacturing and yield-management software used by leading chip fabs and OSAT companies worldwide. Onto Innovation was formed in 2019 through the merger of Nanometrics (founded 1975) and Rudolph Technologies (founded 1940). The company is publicly traded on the NYSE under the ticker ONTO.