Description of Index: The S&P I 00 Index is a capitalization-weighted index of I 00 stocks from a broad range of industries. Base values for the index are adjusted over time to reflect changes in capitalization resulting from mergers, acquisitions, stock rights or substitutions.

Expiration Months: Four near-term months.

Exercise Style: American. OEX options generally may be exercised on any business day prior to the expiration date.

Settlement Exercise: The exercise settlement value, OEX, is calculated using the closing price in the primary market of each component stock on the last business day prior to the expiration date or on the day the exercise notice is properly submitted if exercised before expiration.

Position Limits: For the purposes of calculating these limits, OEX positions are aggregated with all OEX LEAPS positions (OEX, OBX and OLX). For aggregation purposes, one OEX contract equals ten OAX contracts. The current limit is 25,000 OEX (250,000 OEX LEAPS) contracts on either side of the market, provided that no more than 15,000 OEX (I 50,000 OEX LEAPS) contracts are expiring in the nearest expiration month. A customer hedge exemption is available for certain diversified portfolios which expands the position limit to 1 00,000 OEX (1,000,000 OEX LEAPS) contracts.

Exercise Limits: For the purposes of calculating these limits, OEX positions are aggregated with OEX LEAPS' positions. For aggregation purposes, one OEX contract equals ten OEX LEAPS contracts, The current limit is 1 5,000 OEX (I 50,000 OEX LEAPS") contracts within a period of five business days.

Trading System: Market Maker.