** Shares of online lending marketplace LendingTree TREE.O fall 27% to $39.47
** Stock set for biggest single-day percent drop in over 9 years, if losses hold
** Late on Thursday, co forecast Q2 sales between $241 mln and $248 mln; analysts were expecting sales of $248.5 mln - LSEG
** Co posts Q1 sales of $239.7 mln, below analysts' est of $244.9 mln - LSEG
** Brokerage Northland Securities said Q1 results and forecast were "disappointing" due to macro uncertainty and regulatory headwinds
** Co reports Q1 adj profit of 99 cents/share, compared with est profit of 65 cents/share - LSEG
** Including session's move, stock up 0.8% YTD
(Reporting by Kamal Choudhury in Bengaluru)
((Kamal.Choudhury@thomsonreuters.com;))