Hill Ward Henderson advised Semilab International, a Hungary-based global semiconductor metrology company, in the sale of its U.S. operations (Semilab USA) to Onto Innovation Inc. (NYSE: ONTO). Onto Innovation acquired Semilab’s unique materials composition and electrical analysis product lines, expanding its process control portfolio across advanced logic, memory, specialty devices and advanced packaging. The transaction closed on November 17, 2025, with total cash and stock consideration of approximately $495 million.
The Hill Ward Henderson team included shareholders R. Reid Haney, Eric J. Hall and G. Matthew Lastinger, and associate Ryan J. Maloney (corporate), and was further supported by shareholder P. Prestin Weidner and associate Alexandra M. Prati (tax); shareholders Stephen E. Kelly and Andriy Lytvyn (intellectual property); shareholder Roland S. Chase (securities); shareholder Kirsten L. Vignec (executive and employee benefits); shareholder Jeffrey J. Wilcox (labor & employment); senior counsel Lisa G. Gilleland (real estate); and associate Patrick A. Reid (data privacy).
Lead transaction counsel for Onto Innovations was Simpson, Thatcher & Bartlett.
To read the company press release from Onto Innovation, please visit:
Onto Innovation Completes Acquisition of Unique Materials Composition and Electrical Analysis Product Lines from Semilab International