BUZZ-WPP: weakens on FY downgrade

** WPP (Frankfurt: A1J2BZ - news) , the world's biggest ad group, among top FTSE 100 losers, down 0.7% in volume

** Lowers FY organic net sales, profit margin expectations -- on the heels of co's August cut in its sales target, which hit its shares and sent shivers sector wide

** Co, battling a slowdown in client spending, says has suffered in N.America from two account losses, fall in spending from consumer groups

** Lowering of FY margin guidance unexpected surprise, Liberum writes, saying that it may signal that higher margin ad-hoc project work in Q4 might not be arising

** "Sentiment is likely to be subdued until WPP can stop the downgrade cycle," brokerage writes in a note

** Trading 20% lower since Aug warning & since then rivals Publicis (Paris: FR0000130577 - news) , Interpublic have also highlighted the challenging outlook