THE PHILADELPHIA STOCK EXCHANGE TO BEGIN TRADING EIGHT NEW OPTIONS ON THURSDAY, OCTOBER 28

For more information, contact Barbara Sorid at 215-496-5200 or by e-mail

PHILADELPHIA – Oct. 27, 2004 - The Philadelphia Stock Exchange (PHLX) announced today that it will begin trading eight new options on Wednesday, October 27.

Avista Corp. (Nasdaq symbol: AVA) has been allocated to LaBranche Structured Products, LLC. It will trade on the February expiration cycle with initial expiration dates of November, December, February and May. Position and Exercise limits have been set at 1,350,000 shares.

Black Hills Corp. (Nasdaq symbol: BKH) has been allocated to LaBranche Structured Products, LLC. Securities. It will trade on the February expiration cycle with initial expiration dates of November, December, February and May. Position and Exercise limits have been set at 1,350,000 shares.

Third Wave Technologies (Nasdaq symbol: QIT/TWTI/) has been allocated to Market Street Securities. It will trade on the March expiration cycle with initial expiration dates of November, December, March and June. Position and Exercise limits have been set at 3,150,000 shares.

Sigmatel, Inc. (Nasdaq symbol: UGO/SGTL) has been allocated to Group One Ltd. It will trade on the March expiration cycle with initial expiration dates of November, December, March and June. Position and Exercise limits have been set at 3,150,000 shares.

Sigma Designs, Inc. (Nasdaq symbol: MQN/SIGM/) has been allocated to Group One Ltd. It will trade on the January expiration cycle with initial expiration dates of November, December, January and April. Position and Exercise limits have been set at 3,150,000 shares.

Quidel Corp. (Nasdaq symbol: QWS/QDEL) has been allocated to Group One Ltd. It will trade on the March expiration cycle with initial expiration dates of November, December, March and June. Position and Exercise limits have been set at 3,150,000 shares.

Questar Corp. (Nasdaq symbol: STR) has been allocated to Group One Ltd. It will trade on the January expiration cycle with initial expiration dates of November, December, January and April. Position and Exercise limits have been set at 2,250,000 shares.

Molecular Devices Corp. Corp. (Nasdaq symbol: MCQ/MDCC) has been allocated to Group One Ltd. It will trade on the January expiration cycle with initial expiration dates of November, December, January and April. Position and Exercise limits have been set at 1,350,000 shares.

The Philadelphia Stock Exchange (PHLX) was founded in 1790. The PHLX trades more than 2,200 stocks, 1,016 listed equity options, 12 sectors index options and currency pairs. For more information about the PHLX and its products, visit www.phlx.com.

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