THE PHILADELPHIA STOCK EXCHANGE TO BEGIN TRADING TWO NEW OPTIONS ON THURSDAY, AUGUST 30

PHILADELPHIA — August 29, 2007 - The Philadelphia Stock Exchange (PHLX) announced today that it will begin to trade two new options on August 30, 2007. The following two options were allocated to Group One Ltd:

Ducommun Incorporated (option/stock symbol: DCO) will trade on the March expiration cycle with initial expiration months of September, October, December and March. Position and exercise limits have been set at 25,000 contracts.

Sterlite Industries (India) Ltd. (option/stock symbol: SLT) will trade on the March expiration cycle with initial expiration months of September, October, December and March. Position and exercise limits have been set at 250,000 contracts.

The Philadelphia Stock Exchange was founded in 1790. The PHLX trades over 7,000 stocks, 2,520 equity options, 19 sectors index options and currency options and futures. For more information about the PHLX and its products, visit www.phlx.com.