SAN FRANCISCO – Shares of Plug Power Inc. gained 5.4% Wednesday, adding to gains earlier this week after news the fuel-cell maker won a contract to supply power units, fuel, and services at six North American distribution centers of a "leading retailer." The retailer's name has not been disclosed, and terms of the deal were also kept under wraps. So far this week, shares of Plug have gained 19%. The company makes fuel-cell systems for warehouse forklifts and other equipment. The stock has gained 991% in the past 12 months, and 139% in the past three months. Shares got another boost in early January when the company announced a deal with FedEx Corp.
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