According to a legally required lobbying registration obtained by FuelFix, the effort is being funded by 14 independent oil companies that produce crude but do not refine it: Anadarko Petroleum, Chesapeake Energy, Concho Resources, ConocoPhillips, Continental Resources, Devon Energy, Encana Oil and Gas, EOG Resources, Hess, Laredo Petroleum, Marathon Oil, Noble Energy, Occidental Petroleum and Pioneer Natural Resources.