X0306 4 2019-02-01 true 0000726514 ELECTRO SCIENTIFIC INDUSTRIES INC ESIO 0001175993 BALL FREDERICK C/O ELECTRO SCIENTIFIC INDUSTRIES, INC. 13900 NW SCIENCE PARK DR. PORTLAND OR 97229 true Common Stock 2019-02-01 4 D 0 68875 30 D 34058 D Common Stock 2019-02-01 4 D 0 34058 D 0 D 68,875 shares of Issuer common stock were cancelled and disposed of at the effective time of the merger of EAS Equipment, Inc. ("Merger Sub"), a wholly owned subsidiary of MKS Instruments, Inc. ("MKS"), with and into the Issuer (the "Merger"), pursuant to that certain Agreement and Plan of Merger dated October 29, 2018, among the Issuer, MKS and Merger Sub (the "Merger Agreement") as a result of which Issuer became a wholly owned subsidiary of MKS, in exchange for a cash payment of $30.00 per share. Restricted stock units representing the right to receive a total of 34,058 shares of Issuer's common stock were assumed by MKS at the effective time of the Merger and converted into restricted stock units representing the right to receive 12,946 shares of MKS's common stock, in accordance with the terms of the Merger Agreement. By: /s/ Aric McKinnis, Attorney-in-Fact For: Frederick A. Ball 2019-02-01