A generous deal from a specialty pharma company made May a month to remember for Xenoport investors, reports The Motley Fool.

What: Shares of  Xenoport, Inc. (NASDAQ:XNPT), a commercial-stage biotech struggling to expand its pipeline, jumped a whopping 61.1% last month, according to data from S&P Global Market Intelligence. A generous buyout offer from Arbor Pharmaceuticals, LLC sent the stock soaring.

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