Markets Sales drop at Marathon OilUS OIL firm Marathon today posted a rise in third-quarter pre-tax profits to £812million, compared to £644million a year earlier. November 1st 2011, 1:31 pm 1 min read Facebook An icon of a facebook f logo. LinkedIn An icon of the LinkedIn logo. Twitter An icon of the Twitter logo. US OIL firm Marathon today posted a rise in third-quarter pre-tax profits to £812million, compared to £644million a year earlier.