Oil companies shares down at 1 p.m.

Shares of some top oil companies are down at 1 p.m.:

BP PLC fell $.43 or .8 percent, to $52.72.

Chevron fell $.95 or .7 percent, to $130.25.

ConocoPhillips fell $.29 or .3 percent, to $86.12.

Exxon Mobil Corp. fell $.39 or .4 percent, to $102.20.

Marathon Oil Corp. fell $.67 or 1.7 percent, to $39.65.