ANALYSIS: William Blair & Co. analyst John Kreger said Express Scripts' commentary about 2013 was "discouraging." However he maintained an "Outperform" rating on the shares, saying Express Scripts stock is priced attractively in the mid-$50 range.

SHARE ACTION: Express Scripts shares lost $7.73, or 12.3 percent, to $55.15 on Tuesday. That canceled out all the gains that the shares had made since it reported strong second-quarter results in August and raised its estimates for the full year. Its shares reached an all-time high of $65.80 on Oct. 4.

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