Rigrodsky & Long, P.A. announces that it is investigating potential legal claims against the board of directors (the “Board”) of Electro Scientific Industries, Inc. (“ESI” or the “Company”) (NASDAQ GS: ESIO) related to the Company’s entry into an agreement to be acquired by MKS Instruments, Inc. (“MKS”) (NASDAQ GS: MKSI) in a transaction announced on October 30, 2018 (the “Proposed Transaction”).

On October 30, 2018, the Board caused ESI to enter into an agreement and plan of merger (the “Merger Agreement”) with MKS. Pursuant to the terms of the agreement, shareholders of ESI will receive $30.00 in cash for each share of ESI common stock.

On November 19, 2018, ESI filed a preliminary proxy statement (“Proxy Statement”) with the United States Securities and Exchange Commission in connection with the Proposed Transaction, which recommends that ESI’s shareholders vote in favor of the Proposed Transaction. Rigrodsky & Long, P.A. is investigating possible violations of law related to the Proxy Statement, including whether the Proxy Statement omits material information with respect to the Proposed Transaction.

If you own common stock of ESI and purchased any shares before October 30, 2018, if you would like to learn more about this investigation, or if you have any questions concerning this announcement or your rights or interests, please contact Seth D. Rigrodsky or Gina M. Serra toll-free at (888) 969-4242, by e-mail at info@rl-legal.com, or at https://www.rigrodskylong.com/offices-contact.

Rigrodsky & Long, P.A., with offices in Delaware, New York, and California, has recovered hundreds of millions of dollars on behalf of investors and achieved substantial corporate governance reforms in numerous cases nationwide, including federal securities fraud actions, shareholder class actions, and shareholder derivative actions.

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