THE PHILADELPHIA STOCK EXCHANGE TO BEGIN TRADING ONE NEW OPTION ON FRIDAY, JUNE 22

PHILADELPHIA — June 21, 2007 - The Philadelphia Stock Exchange (PHLX) announced today that it will begin to trade one new option on June 22, 2007. The following option has been allocated to Market Street Securities:

IDM Pharma, Inc. (option/stock symbol: QDP/IDMI) will trade on the March expiration cycle with initial expiration months of July, August, September and December. Position and exercise limits have been set at 75,000 contracts.

The Philadelphia Stock Exchange was founded in 1790. The PHLX trades over 7,000 stocks, 2,520 equity options, 17 sectors index options and currency options and futures. For more information about the PHLX and its products, visit www.phlx.com.