Today there seems to be two options available on Yahoo! at every strike price, every expiration. Here is a MSFT example: http://finance.yahoo.com/q/op?s=MSFT&m=2012-07 They differ in that the option name may have either two or three zeros following the dollar strike value. i.e. There are two July $30 calls listed as: MSFT120721C0003000 MSFT120721C00030000 The bid/ask prices on the second series are about 12 cents higher. Also true for most other tickers I plug in. Is this a quirk at Yahoo today, or has something strange happenned (or both)? Ralph
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