The Philadelphia Stock Exchange To Begin Trading One New Option On Friday, April 27

The Philadelphia Stock Exchange (PHLX) announced today that it will begin to trade a new option on April 27, 2007. The option has been allocated to Citadel Derivatives Trading Group LLC:

Electro Scientific Industries, Inc. (option/stock symbol: EQO/ESIO) will trade on the March expiration cycle with initial expiration months of May, June, September and December. Position and exercise limits have been set at 50,000 contracts.

The Philadelphia Stock Exchange was founded in 1790. The PHLX trades over 7,000 stocks, 2,434 equity options, 17 sectors index options and currency options and futures. For more information about the PHLX and its products, visit www.phlx.com.