THE PHILADELPHIA STOCK EXCHANGE TO BEGIN TRADING TWO NEW OPTIONS

PHILADELPHIA — May 2, 2005 — The Philadelphia Stock Exchange (PHLX) announced today that it will begin trading two new options on May 3, 2005.

Nalco Holding Co. (option/stock symbol: NLC) was allocated to LaBranche Structured Products, LLC. It will trade on the March expiration cycle with initial expiration months May, June, September and December. Position and exercise limits have been set at 75,000 contracts.

Neurochem, Inc. (option/stock symbol: KQM/NRMX) was allocated to LaBranche Structured Products, LLC. It will trade on the February expiration cycle with initial expiration months June, August, November and March. Position and exercise limits have been set at 50,000 contracts.

The Philadelphia Stock Exchange was founded in 1790. The PHLX trades 2,000 stocks, 1,650 equity options, 22 sectors index options and currency options and futures. For more information about the PHLX and its products, visit www.phlx.com