Short interest in Novavax increased more than 13% to 37.8 million shares, or about 45% of the total float, between March 15-31, according to data compiled by FactSet. Other biotech companies that saw growing short interest are Cassava Sciences , with a 10% increase, and Fate Therapeutics , which saw a 26% boost. Meanwhile, bluebird bio had a 29% increase in its short interest to 26% of float. Cinemark and AMC Entertainment both saw increases in their short position to 28% and 27% of their respective floats. All names trade on the NYSE or Nasdaq, have short positions amounting to at least 25% of their total float and have market values of at least $100 million.

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