shares of regeneron pharmaceuticals inc regn slipped 028 to 59490 wednesday on what proved to be an allaround favorable trading session for the stock market with the sp 500 index spx rising 036 to 384508 and the dow jones industrial average djia rising 023 to 3103768 the stocks fall snapped a twoday winning streak regeneron pharmaceuticals inc closed 15252 below its 52week high 74742 which the company achieved on april 8th the stock demonstrated a mixed performance when compared to some of