shares of laboratory corp of america holdings lh shed 150 to 21925 monday on what proved to be an allaround dismal trading session for the stock market with the sp 500 index spx falling 015 to 385576 and dow jones industrial average djia falling 028 to 3181914 this was the stocks seventh consecutive day of losses laboratory corp of america holdings closed 6197 below its 52week high 28122 which the company reached on march 22nd the stock underperformed when compared to some of its competitors