** British trading platform CMC Market CMCX.L shares slide as much as 17.9% to 233.5p; on track for its biggest pct loss in over four months
** Stock among top losers on FTSE mid-cap index .FTMC, which is down 0.28%
** Posts FY25 adjusted PBT of 84.5 million pounds ($114.64 million), but falls short of analysts' estimate of 90.6 million pounds, as a per a company poll
** Co says recent trading conditions have been supportive, providing good momentum into fiscal 2026
** CMCX to maintain tight cost control while continuing to invest in operational efficiency and platform capability.
** Including session loss, stock has fallen 0.74% YTD
($1 = 0.7374 pounds)
(Reporting by Subiksha S in Bengaluru)
((Subiksha.S@thomsonreuters.com))