UPDATE: The spike and subsequent circuit breaker ...

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Trader Talk Trading Halts

Brean Capital Upgrades Regeneron Pharma (REGN) to Buy, PT $315May 3, 2013 2:41 PM JMP Securities Upgrades Regeneron Pharma (REGN) to Market OutperformMay 2, 2013 7:23 AM Morgan Stanley Downgrades Allergen (AGN) to EqualweightMay 1, 2013 2:31 PM Reduced Competition Adds $35 to Regeneron (REGN) DCF, Deutsche Bank Raises PT to $310May 1, 2013 12:55 PM Allergan (AGN) Strong With or Without DARPin - RBCMay 1, 2013 12:02 PM Regeneron (REGN) trading paused for volatilityMay 1, 2013 11:07 AM