shares of martin marietta materials inc mlm slid 052 to 40247 tuesday on what proved to be an allaround grim trading session for the stock market with the sp 500 index spx falling 064 to 410990 and dow jones industrial average djia falling 101 to 3301214 martin marietta materials inc closed 255 short of its 52week high 40502 which the company achieved on may 15th trading volume 364867 remained 7489 below its 50day average volume of 372356 editors note this story was autogenerated by automated insights an automation technology provider using data from dow jones and factset see our market data terms of use