shares of wr berkley corp wrb shed 193 to 6598 tuesday on what proved to be an allaround poor trading session for the stock market with the sp 500 index spx falling 092 to 381880 and dow jones industrial average djia falling 062 to 3098133 this was the stocks fourth consecutive day of losses wr berkley corp closed 634 short of its 52week high 7232 which the company reached on june 7th