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U.S. stocks were higher, with the Dow Jones index gaining around 200 points on Wednesday.Shares of Dynavax Technologies Corp (NASDAQ:DVAX) rose sharply during Wednesday's session after Sanofi SA (NASDAQ:SNY) agreed to acquire the company for $15.50 per share in cash, reflecting a total equity value of approximately $2.2 billion.The acquisition augments Sanofi's presence in adult immunization.Dynavax shares jumped 38.6% to $15.44 on Wednesday.Here are some other big stocks recording gains in today’s session. ...