** Shares of investment platform AJ Bell AJBA.L rise as much as about 14% to a record high
** Stock atop FTSE midcaps .FTMC index
** Co reports underlying profit before tax up 15% at £79 million ($106.09 million) due to volatile markets boosting trading activity on its investment platform
** Co now expects full-year revenue margin, PBT and PBT margin to be higher than previously guided
** 6 of the 15 analysts covering the stock have a "buy" or higher rating and 9 have "hold"; median PT is 535p - data compiled by LSEG
** YTD, stock has risen ~21%
($1 = 0.7447 pounds)
(Reporting by Tuhina in Bengaluru)
((tuhina@thomsonreuters.com))