Shares of small-cap biotech Sorrento Therapeutics (NASDAQ: SRNE) were up by a noteworthy 13.3% on heavy trading volume as of 11:24 a.m. ET Tuesday. What's particularly interesting about this double-digit percentage move is that the company hasn't announced any significant material events in about a month. The biotech stock shed an eye-catching 56% of its value amid that downturn.
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