** U.S.-listed shares of oil firms gain premarket, tracking rise is oil prices O/R

** Brent crude futures LCOc1 up 3.2% at $64.77/barrel; while U.S. West Texas Intermediate crude CLc1 rise 3.4% to $62.85/barrel

** Crude prices rise after producer group OPEC+ decided to increase output in July by the same amount as it did in each of the prior two months

** Energy majors Chevron CVX.N and Exxon XOM.N both up marginally

** Devon Energy DVN.N, Diamondback Energy FANG.O, EOG ResourcesEOG.N, APA Corp APA.O and ConocoPhillips COP.N rise between 1% and 1.6%

** Oilfield services companies Halliburton HAL.N rise 1.4% and SLB SLB.N up 1.1%

** Refiners Marathon Petroleum MPC.N and Phillips 66 PSX.N both up marginally

(Reporting by Sumit Saha in Bengaluru)

((Sumit.Saha@thomsonreuters.com;))