NEW YORK, November 8, 2018 – Levi & Korsinsky, LLP has commenced an investigation into the fairness of the sale of Electro Scientific Industries, Inc. (“Electro Scientific” or the “Company”) (NASDAQGS: ESIO) to MKS Instruments, Inc. (NASDAQGS: MKSI). Under the terms of the transaction, Electro Scientific shareholders will receive $30 per share. To learn more about the ESIO merger investigation and your rights, go to: https://www.zlk.com/mna/electro-scientific-industries-inc or contact Joseph E. Levi, Esq. either via email at jlevi@levikorsinsky.com or by telephone at (212) 363-7500, toll-free: (877) 363-5972. There is no cost or obligation to you.

The Electro Scientific merger investigation concerns whether the Board of Electro Scientific breached their fiduciary duties to stockholders by failing to adequately shop the Company before agreeing to enter into this transaction, and whether MKS Instruments, Inc. is underpaying for Electro Scientific shares, thus unlawfully harming Electro Scientific shareholders.

Levi & Korsinsky is a national firm with offices in New York, Connecticut, California, and Washington D.C. The firm’s attorneys have extensive expertise in prosecuting securities litigation involving financial fraud, representing investors throughout the nation in securities lawsuits and have recovered hundreds of millions of dollars for aggrieved shareholders. For more information, please feel free to contact any of the attorneys listed below. Attorney advertising. Prior results do not guarantee similar outcomes.

CONTACT:

Levi & Korsinsky, LLP
Joseph E. Levi, Esq.
55 Broadway, 10th Floor
New York, NY 10006
Tel: (212) 363-7500
Toll Free: (877) 363-5972
Fax: (212) 363-7171
www.zlk.com