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PHLX To Begin Trading Twenty Five New Options On Wednesday, August 22

Date 21/08/2007

The Philadelphia Stock Exchange (PHLX) announced today that it will begin to trade twenty-five new options on August 22, 2007. The following nineteen options were allocated to Group One Ltd:

Wintrust Financial Corporation (option/stock symbol: QFC/WTFC) 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 50,000 contracts.

Regeneration Technologies, Inc. (option/stock symbol: RQK/RTIX) will trade on the February expiration cycle with initial expiration months of September, October, November and February. Position and exercise limits have been set at 25,000 contracts.

Skillsoft PLC (option/stock symbol: QAG/SKIL) will trade on the February expiration cycle with initial expiration months of September, October, November and February. Position and exercise limits have been set at 75,000 contracts.

SPSS Inc. (option/stock symbol: QSK/SPSS) 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 50,000 contracts.

Unisource Energy Corporation (option/stock symbol: UNS) 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 75,000 contracts.

Vicor Corporation (option/stock symbol: VQV/VICR) will trade on the January expiration cycle with initial expiration months of September, October, January and April. Position and exercise limits have been set at 25,000 contracts.

Post Properties, Inc. (option/stock symbol: PPS) 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.

Infrasource Services, Inc. (option/stock symbol: IFS) 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 75,000 contracts.

Integrated Electrical Services, Inc. (option/stock symbol: EVQ/IESC) 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.

Interwoven, Inc. (option/stock symbol: IUW/IWOV) 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 75,000 contracts.

Metretek Technologies, Inc. (option/stock symbol: MEK) 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 50,000 contracts.

HMS Holdings Corporation (option/stock symbol: QHT/HMSY) 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 50,000 contracts.

Dover Downs Gaming and Entertainment, Inc. (option/stock symbol: DDE) 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.

DG Fastchannel, Inc. (option/stock symbol: QDR/DGIT) 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 75,000 contracts.

Employers Holdings, Inc. (option/stock symbol: EIG) 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 75,000 contracts.

The Geo Group Inc. (option/stock symbol: GEO) 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 100,000 contracts until December 22, 2007, then the limits will revert to 50,000 contracts.

Bare Escentuals, Inc. (option/stock symbol: URY/BARE) 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 75,000 contracts.

Hawaiian Electric Industries, Inc. (option/stock symbol: HE) 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 50,000 contracts.

Superior Essex, Inc. (option/stock symbol: SZU/SPSX) 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 50,000 contracts.

The following five options were allocated to Susquehanna Investment Group:

IDEX Corporation (option/stock symbol: IEX) will trade on the January expiration cycle with initial expiration months of September, October, January and April . Position and exercise limits have been set at 75,000 contracts.

Baldor Electric Company (option/stock symbol: BEZ) will trade on the February expiration cycle with initial expiration months of September, October, November and February . Position and exercise limits have been set at 75,000 contracts.

SEACOR Holdings, Inc. (option/stock symbol: CKH) will trade on the January expiration cycle with initial expiration months of September, October, January and April. Position and exercise limits have been set at 50,000 contracts.

Callon Petroleum Company (option/stock symbol: CPE) will trade on the January expiration cycle with initial expiration months of September, October, January and April . Position and exercise limits have been set at 50,000 contracts.

Isilon Systems, Inc. (option/stock symbol: QIC/ISLN) 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 75,000 contracts.

Universal Corporation (option/stock symbol: UVV) will trade on the February expiration cycle with initial expiration months of September, October, November and February. 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, 2,502 equity options, 19 sectors index options and currency options and futures. For more information about the PHLX and its products, visit www.phlx.com.