December E-mini S&Ps (ESZ14 -0.35%) this morning are down -0.33% and European stocks are down -0.44% as Amazon.com dropped 10% in pre-market trading after lowering Q4 revenue guidance .

Welcome to edition 210 of Insider Weekends. Insider buying decreased last week with insiders buying $29.36 million of stock compared to $59.95 million in the week prior.