Mallinckrodt PLC MNK is up 5.56 percent at $54.80 on Friday.
Possibly contributing to the spike is a tweet from Citron Research, which read: "@CitronResearch Clarification: Citron does not recommend short $MNK at $54 for short-term. Wait for fundamentals to ‘kick in' and guide lower –like $VRX."
This is not the first time the stock has moved on Citron news.
Earlier in the week, Citron's Andrew Left issued a note to clients regarding Mallinckrodt and Valeant Pharmaceuticals Intl Inc VRX.
In the note, Left called Mallinckrodt the "poster child" for price gouging. Subsequently, Valeant plunged 50 percent and Mallinckrodt fell subject to a related selloff.
Valeant is currently down 9.33 percent at $26.92.
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