ESI Announces Participation in Midtown CAP Summit Investor Conference

Electro Scientific Industries, Inc. (NASDAQ: ESIO), a leading supplier of innovative laser-based manufacturing solutions for the microtechnology industry, today announced that CEO Nick Konidaris and CFO Paul Oldham are scheduled to participate in the Midtown CAP Summit Investor Conference to be held December 11, 2012 from 9:00 AM to 1:00 PM at the Marriott Marquis Hotel located at 1535 Broadway in New York City.

The event is hosted by executive management from the following participating companies: Aehr Test Systems (NASDAQ: AEHR), Brooks Automation (NASDAQ: BRKS), Cohu (NASDAQ: COHU), ESI (NASDAQ: ESIO), inTEST (NASDAQ:INTT), Intevac (NASDAQ: IVAC), LTX-Credence Corporation (NASDAQ: LTXC), Rudolph Technologies (NASDAQ: RTEC), Ultra Clean Technology (NASDAQ: UCTT) and Ultratech (NASDAQ: UTEK) and will feature a round-robin format consisting of small group meetings, each 25 minutes in duration.

The Midtown CAP Summit is by invitation only and is open to accredited investors and publishing research analysts. As space is limited, please RSVP early. Last day for registration is November 30.

About ESI, Inc.

ESI is a leading supplier of innovative, laser-based manufacturing solutions for the microtechnology industry. Our systems enable precise structuring and testing of micron to submicron features in electronic devices, semiconductors, LEDs and other high-value components. We partner with our customers to make breakthrough technologies possible in the microelectronics, semiconductor and other emerging industries. Founded in 1944, ESI is headquartered in Portland, Ore., with global operations from the Pacific Northwest to the Pacific Rim. More information is available at www.esi.com.