THE PHILADELPHIA STOCK EXCHANGE TO BEGIN TRADING ONE NEW OPTION ON MONDAY, FEBRUARY 11

PHILADELPHIA — February 8, 2008 -The Philadelphia Stock Exchange (PHLX) announced today that it will begin to trade one new option on February 11, 2008. The following option was allocated to Citadel Derivatives Trading Group LLC:

RiskMetrics Group, Inc.(option/stock symbol: RMG) will trade on the February expiration cycle with initial expiration months of February, March, May and August. 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, 2,640 equity options, 17 sectors index options and currency options and futures. For more information about the PHLX and its products, visit www.phlx.com.

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