shares of steris plc ste rose 266 to 21312 wednesday on what proved to be an allaround mixed trading session for the stock market with the sp 500 index spx rising 008 to 437259 and the dow jones industrial average djia falling 068 to 3397933 steris plc closed 1424 short of its 52week high 22736 which the company reached on august 2nd