BUZZ-AO World: profit warning sees shares slump by a quarter
** A profit warning puts online white goods retailer AO World on course for its biggest one-day pct drop in short history as listed co
** Stock dives 27 pct, wiping $495 mln off co's market value
** Now (NYSE: DNOW - news) trading about 28 pct below its 285p float price
** Co, which cuts FY earnings outlook, says apparent some of the revenue growth in H2 2014 going into FY15 down to extra publicity around its IPO
** IPO raised 423 mln pounds at the top of its price range, for a 1.2 bln pound market cap amid a rush by stocks to list which stirred memories of tech bubble
** Co had been richly valued compared to peers
** Most actively traded stock on the FTSE 250, with almost three times its 90-day daily avg having gone through (RM (LSE: RM.L - news) : tricia.wright1.thomsonreuters.com@reuters.net)