Shares of some top oil companies are mixed at 10 a.m.:

BP PLC rose $.12 or .2 percent, to $51.09.

Chevron rose $.07 or .1 percent, to $132.65.

ConocoPhillips fell $.16 or .2 percent, to $85.86.

Exxon Mobil Corp. rose $.26 or .3 percent, to $103.80.

Marathon Oil Corp. rose $.22 or .5 percent, to $40.42.