** Shares of Martin Sorrell's advertising group S4 Capital SFOR.L slump 8.5% to 16.9 pence, an all-time low
** Co cuts annual revenue forecast for the fourth time this year and warns on profit
** "Trading conditions for marketing services remain challenging, with high client caution on spend," say analysts at Peel Hunt
** SFOR expects 2025 like-for-like net revenue to fall about 10% vs an earlier forecast of upper single-digit decline
** Targets annual operational EBITDA of about 75 million pounds ($98.22 million), below company-compiled consensus of 81.6 million pounds
** Including session moves, SFOR down ~51% YTD
($1 = 0.7636 pounds)
(Reporting by Nithyashree R B in Bengaluru)
((NithyashreeRB@thomsonreuters.com))