DEFINITION of 'OEX'
The ticker symbol used to identify index options traded on the Standard & Poor's 100 index. OEX options are listed with a letter code indicating the month code for puts and calls, and a letter code indicating the strike price. Strike prices greater than five points use three letters to indicate which group of 100 the option is trading for.
BREAKING DOWN 'OEX'
For example, a February Call 480 would be written as OXB BP, which can also be written as OXBBP or OXB=BP. The S&P 100 is a market-capitalization weighted index of 100 stocks from a broad range of industries.