shares of wr berkley corp wrb rose 329 to 5840 thursday on what proved to be an allaround positive trading session for the stock market with the sp 500 index spx rising 122 to 442584 and the dow jones industrial average djia rising 126 to 3440806 wr berkley corp closed 1859 short of its 52week high 7699 which the company achieved on december 1st