** Shares of U.S. energy companies gain premarket, tracking rise in oil prices
** Brent crude futures LCOc1 up 2.6% at $111.05/barrel; U.S. West Texas Intermediate CLc1 rises 3% to $99.28/barrel
** Crude prices gain as attempts to resolve Iran war seemed to have stalled, with Strait of Hormuz waterway remaining largely closed, depriving markets of essential energy supplies from Middle East
** Energy majors Exxon XOM.N and Chevron CVX.N up 1.5% and 1.2%, respectively
** Oil and gas producers Occidental Petroleum OXY.N up 1.6%, ConocoPhillips gains 1% and APA Corp APA.O rises 2.2%
** Oilfield services companies Baker Hughes BKR.O up 2%, and Halliburton HAL.N gains 1.1%
** Refiners Marathon Petroleum MPC.N gains 1.5% and Phillips 66 PSX.N up 1.7%
(Reporting by Pranav Mathur in Bengaluru)
((Pranav.Mathur@thomsonreuters.com;))