shares of caterpillar inc cat slid 373 to 21726 wednesday on what proved to be an allaround grim trading session for the stock market with the sp 500 index spx falling 070 to 389193 and dow jones industrial average djia falling 087 to 3187457 caterpillar inc closed 4878 below its 52week high 26604 which the company achieved on january 27th the stock underperformed when compared to some of its competitors wednesday as deere  co de fell 297 to 39048 trading volume 53 m eclipsed its 50day