shares of perrigo co plc prgo inched 028 higher to 3569 thursday on what proved to be an allaround positive trading session for the stock market with the sp 500 index spx rising 176 to 396028 and the dow jones industrial average djia rising 117 to 3224655 perrigo co plc closed 821 below its 52week high 4390 which the company achieved on august 9th the stock demonstrated a mixed performance when compared to some of its competitors thursday as johnson  johnson jnj fell 021 to 15403 procter