Pharmaceutical giant Regeneron Pharmaceuticals Inc has announced its drug-development ally Sanofi SA plans to increase its stock in the pharma company through a 5.3 percent purchase. In a statement, Sanofi said it is allowed to build its stock in Regeneron to up to 30 percent; Sanofi controls 16.7 percent currently, according to reports. Sanofi also denied speculation that the company is going after a controlling stake in the pharmaceutical company. The two have a longstanding partnership in drug development.
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