OEX Options Product Specification

OEX® S&P 100 Index Options

The Standard & Poor's 100 Index is a capitalization-weighted index of 100 stocks from a broad range of industries. The component stocks are weighted according to the total market value of their outstanding shares. The impact of a component's price change is proportional to the issue's total market value, which is the share price times the number of shares outstanding. These are summed for all 100 stocks and divided by a predetermined base value. The base value for the S&P 100 Index is adjusted to reflect changes in capitalization resulting from mergers, acquisitions, stock rights, substitutions, etc.
Premium Quote
Stated in decimals. One point equals $100. Minimum tick for options trading below 3.00 is 0.05 ($5.00) and for all other series, 0.10 ($10.00).
Strike Prices
In-, at- and out-of-the-money strike prices are initially listed. New series are generally added when the underlying trades through the highest or lowest strike price available.
Strike Price Intervals
Five points. 10-point intervals in the far-term month.
Expiration Months
Four near-term months plus one additional month from the March quarterly cycle.
Expiration Date
The third Friday of the expiration month.
Exercise Style
American - OEX options generally may be exercised on any business day up to and including on the expiration date.
Last Trading Day
Trading in OEX options will ordinarily cease at the close of business on their expiration date.
Settlement of Option Exercise
The exercise-settlement value, OEX, is calculated using the last (closing) reported sales price in the primary market of each component stock on the expiration date or on the day the exercise notice is properly submitted if exercised before expiration. The exercise-settlement amount is equal to the difference between the exercise-settlement value, OEX, and the exercise price of the option, multiplied by $100. Exercise will result in delivery of cash on the business day following the day the exercise notice is properly submitted.
Position and Exercise Limits
No position and exercise limits are in effect.
Purchases of puts or calls with 9 months or less until expiration must be paid for in full. Writers of uncovered puts or calls must deposit / maintain 100% of the option proceeds* plus 15% of the aggregate contract value (current index level x $100) minus the amount by which the option is out-of-the-money, if any, subject to a minimum for calls of option proceeds* plus 10% of the aggregate contract value and a minimum for puts of option proceeds* plus 10% of the aggregate exercise price amount. (*For calculating maintenance margin, use option current market value instead of option proceeds.) Additional margin may be required pursuant to Exchange Rule 12.10.
Cusip Number
Trading Hours
8:30 a.m. - 3:15 p.m. Central Time (Chicago time).

Position and Exercise limits are subject to change.