MercadoLibre falls as logistics costs weigh on margins, profit misses

** Shares of Uruguay-headquartered e-commerce firm MercadoLibre MELI.O fall 6.3% to $1631 premarket

** Posts Q3 net income of $448 mln, below analysts' estimates of $476 mln, according to data compiled by LSEG data

** Operating margin falls to 6.3% from nearly 10% a year earlier, below 7% expected per LSEG data

** Margins hurt by logistics expansion , free-shipping costs and higher marketing spending

** 20 of 24 brokerages rate the stock "buy" or higher and four "hold"; median PT is $2250 - LSEG

** As of last close, stock down 13.6% YTD