Pre-Market Imbalance Update: Alibaba 160K Shares to Sell, BofA 121K to Sell, Chesapeake Energy 95K to Sell, Pfizer 84K to Sell, Colgate-Palmolive 75K to Sell, Wells Fargo 72K to Sell, Visa 51K to Sell, Mastercard 38K to Sell, Macy's 34K to Sell