shares of diamondback energy inc fang slid 322 to 13154 monday on what proved to be an allaround poor 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 sixth consecutive day of losses diamondback energy inc closed 3741 short of its 52week high 16895 which the company reached on november 15th the stock demonstrated a mixed performance when compared to some of its competitors monday