Midday Glance: Oil companies

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

Chevron fell $1.46 or 1.7 percent, to $84.63.

ConocoPhillips fell $1.03 or 1.6 percent, to $61.86.

Exxon Mobil fell $1.22 or 1.7 percent, to $70.61.

Marathon Oil fell $.59 or 1.7 percent, to $33.55.