STLtoday.com | US stock indexes mostly flat in afternoon trading; oil slips U.S. News & World Report SLIPPING AND SLIDING: Shares in several oil exploration and production companies moved lower. QEP Resources fell $1.12, or 5.2 percent, to $20.47, while Murphy Oil slid $1.58, or 3.4 percent, to $45.06. National Oilwell Varco shed $2.04, or 3.8 percent ... Stocks mostly flat in midday trading; oil slips US Stock Indexes Are Mostly Flat in Midday Trade; Oil Slips |