A look at Nasdaq 10 most-active stocks at 1 p.m.:
Apple Inc. fell 1.5 percent to $434.65 with 11,462,000 shares traded.
Cisco Systems Inc. fell .2 percent to $20.81 with 13,472,500 shares traded.
Facebook Inc. rose 1.4 percent to $27.64 with 27,737,000 shares traded.
Groupon Inc. rose 10.2 percent to $4.99 with 34,747,000 shares traded.
Intel Corp. rose 1.1 percent to $21.12 with 30,015,500 shares traded.
Microsoft Corp. rose .4 percent to $27.93 with 17,196,000 shares traded.
Research in Motion Ltd. fell .1 percent to $13.34 with 27,273,400 shares traded.
Sirius XM Radio Inc. rose 1.3 percent to $3.15 with 41,456,600 shares traded.
Yahoo Inc. rose 3.2 percent to $21.99 with 23,417,500 shares traded.
Zynga Inc. rose 2.1 percent to $3.45 with 16,815,100 shares traded.
