RANCHO CUCAMONGA, Calif., June 30, 2014 (GLOBE NEWSWIRE) -- Amphastar Pharmaceuticals, Inc. (Amphastar) (Nasdaq:AMPH), a specialty pharmaceutical company that focuses primarily on developing, manufacturing, marketing, and selling technically-challenging generic and proprietary injectable and inhalation products, today announced that the underwriters of its initial public offering exercised in full their option to purchase from Amphastar 1,200,000 additional shares of its common stock at the initial public offering price of $7.00 per share.
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