Wal-Mart put out a profit warning that could impact its shares and that of other companies in the retailing sector today. Google has been trading slightly higher in overnight trading while Amazon sold off in early trading after missing on earnings. Wal-Mart issues profit warning, EPS to come in near or below bottom of previous $1.60-$1.70 guidance range. Google $12.01 vs street $12.24, announced stock split and division into voting/non-voting share structure, selling Motorola handset business to Lenovo, keeping patents Amazon $0.51 vs street $0.74, sales guidance $18.2-$19.9B vs street $19.6B