CME
Contract Specification Notes

#   Options also eligible for strike listings at 1/2 the normal strike price interval under certain circumstances. Please see Rulebook.
##   Termination of trading for certain interest rate contracts shall be 11:00 a.m. London time on the second London business day immediately preceding the third Wednesday of the contract month. This is 5:00 a.m. Chicago time, except when Daylight Savings Time is in effect in either, but not both, London or Chicago.
###   The underlying futures contract for serial month options is the Eurodollar (Euroyen) futures contract in the March quarterly cycle with an expiration date most closely following the option's expiration date. For example, the December 2004 Eurodollar (Euroyen) futures contract is the underlying contract for the November 2004 options.
####   Spot Butter, Spot Cheese and Spot Nonfat Dry Milk trade daily.

*   Times in parentheses indicate close on last day of trading (Central Time). Please note that pursuant to Rules 45202.G and 45302.G, the Eurodollar and Libor contracts will close on the last day of trading at 11:00 a.m. London Time on the second London bank business day immediately preceding the third Wednesday of the contract month. This is 5:00 a.m. Chicago time except when Daylight Savings time is in effect in either, but not both London or Chicago.
**   See special provisions of contract in Rulebook.
***   In the third and fourth nearest contract month of the March quarterly cycle for the following products: quarterly S&P ® Midcap 400 TM , quarterly Russell 2000 ®,  quarterly S&P 500 ®/Barra ® Growth and quarterly S&P 500/Barra Value, the exercise prices shall be an integer divisible by 5. In all other months, the exercise prices will be a number divisible by 2.5.
****   The underlying futures contract for Brazilian Real monthly options is the futures contract with the same contract month as the monthly option. For Brazilian Real weekly expiration options, the underlying futures contract is the nearest futures contract in the consecutive contract month cycle that has not yet terminated.

+   The underlying futures contract for both serial and quarterly options as well as for weekly expiration options is the futures contract with greater than two Exchange business days before its LTD when the options expire. Please note that a weekly option will expire during each week in which no serial or quarterly option is scheduled to expire, however, weekly currency options may be listed up to five weeks prior to their expiration.
++   In the third and fourth nearest contract month in the S&P 500 March quarterly cycle, the exercise prices, with the exception of quarter point strike prices, shall be an integer divisible by 10. In all other months, the exercise prices will be an integer divisible by 5.
+++   Currency futures trades may also occur during RTH in ½ tick increments for intra-commodity spreads executed as simultaneous transactions pursuant to Rule 542.A.
++++   The One-Month LIBOR, Feeder Cattle, quarterly S&P 500, quarterly E-mini TM S&P 500, quarterly E-mini S&P 500, quarterly S&P 500/Barra Growth Index, quarterly S&P 500/Barra Value Index, quarterly Midcap 400, quarterly E-mini Midcap 400, quarterly Nikkei ® 225, quarterly NASDAQ-100 ® Index, quarterly E-mini NASDAQ-100 Index, quarterly Russell 2000 Index, quarterly E-mini Russell 2000,  quarterly Eurodollar, quarterly Euroyen, monthly Brazilian Real and the monthly Goldman Sachs contracts are cash-settled on the settlement day.
+++++   For monthly options, the underlying futures contract is the same as the option contract month. For weekly expiration options that expire before the monthly option the underlying futures contract is the same as the option contract month. For weekly options which expire after the monthly options, the underlying futures contract is the futures contract of the next consecutive calendar month.

^   Times in parentheses indicate close on last day of trading (Central Time). RTH = REGULAR TRADING HOURS
^^   The Reopening Process: Once trading in the primary securities market resumes after a trading halt, trading in CME ® domestic Equity Index futures contracts shall resume only after 50 percent of the stocks underlying the S&P 500 Stock Price Index (selected according to capitalization weights) have reopened.
^^^   Times in parentheses indicate close on last day of trading (Central Time). Please note that pursuant to Rule 26001.G, the contract will close on the last day of trading at 2:00 a.m. (Chicago Time), but may be either 1:00 a.m. or 3:00 a.m. (Chicago Time) when Daylight Savings Time is in effect in either, but not both, Moscow or Chicago.
^^^^   Flex ® Contracts are not traded within 10 minutes of the daily opening and within 30 minutes of the daily close.
^^^^^   All trading in the E-mini S&P 500 will occur on Globex ® with the exception of "All-or-None" (AON) trades during RTH. Trading shall continue on Globex until 8:30 a.m. the day following the last day of trading on the trading floor.

&   AON is All-Or-None with the minimum AON threshold in contracts within the paranthesis.

This page is based on information that may change without notice. Please consult CME or your broker if you have any questions. This information shall in no way be construed as being the official rules of CME.