BUZZ-Mallinckrodt shares tumble after Citron Research tweet

Mon Nov 9, 2015 2:27pm EST
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** Mallinckrodt shares drop 17 pct in response to tweet from short-selling firm Citron Research

** Citron previously had targeted Valeant Pharmaceuticals ; those shares cratered after Citron report

** Citron tweet on Monday: "At these prices $MNK has signif more downside than $VRX-- far worse offender of the reimb sys - more to follow. VRX can't live in a vacuum"

** Mallinckrodt shares halted at least twice after Citron tweet

** Options active as traders snapped up near-term protection; puts trade at 12x the normal pace with 11,000 contracts traded by 2:20 p.m. ET, according to Trade Alert

** Nov 13 weekly puts at strikes ranging from $35 to $66 active; Nov $60 puts the most active contract on Monday

** Mallinckrodt shares had been off more modestly earlier on Monday, after company issued release on lupus drug missing main goal in a study

** Vanguard, Paulson & Co, Janus Capital, Viking Global among top Mallinckrodt holders, according to Thomson Reuters data (; Reuters Messaging:;