BUZZ-ASOS: CS cuts to "underperform"

** British online fashion retailer ASOS (LSE: ASC.L - news) 's shares down 4.5 pct; fall for fifth straight session

** Credit Suisse (IOB: 0QP5.IL - news) cuts to "underperform" from "neutral"

** Interim results this week and prelims in Oct (Shenzhen: 000069.SZ - news) highlight lack of operating leverage in the near term and lack of clarity on long-term margin potential relative to peers, brokerage says

** "Looking at the next six months to one year, we see many reasons to be cautious on the name," it adds

** Company upped its sales growth forecasts but left its profits-before-tax outlook unchanged on Tuesday

** Up to Wednesday's close, stock had risen 12 pct YTD