Nearing the halfway mark in today's session, here are the individual equity names with the most call and put buying on optionMONSTER's ActionTracker data system.
MannKind (MNKD): For the second day in a row, a large short position in the January 5 calls was closed and rolled to January 9s. More than 30,000 contracts traded at each strike. The investor paid $1.40 and raised by $4 the level at which they must sell their shares. MNKD rose 9.79 percent to $6.84.
Facebook (FB): More than 17,000 of the 25.50 weekly calls expiring next Friday, May 31, were purchased, mostly for $0.22 to $0.40, as investors look for upside in the social-media company. FB rose 0.17 percent to $25.20.
Alerian MLP fund (AMLP): An investor bought 16,600 July 17 puts for $0.25 and $0.30 against open interest of 1,363 contracts, looking to protect against a pullback in the pipeline fund. AMLP fell 0.96 percent to $17.90.
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