** S&P 500 Energy .SPNY index down 1.2%, tracking declines in the broader S&P 500 index .SPX

** Halliburton HAL.N , APA Corp APA.O, Marathon Petroleum MPC.N and Occidental Petroleum OXY.N fall between 2.8% and 4.4%; among the top percentage losers on the energy index

** Energy majors Chevron CVX.N down 1.6% and Exxon XOM.N falls 1.3%

** Oilfield services company Baker Hughes BKR.O fall 1.3% and SLB SLB.N down 2.8%

** Refiners Phillips 66 PSX.N and HF Sinclair DINO.N down 1.9% and 2.6% respectively

** Wall Street fell marginally as investors ran into President Donald Trump's latest tariff threats against the EU and Mexico, starting a week loaded with economic data and major second-quarter earnings .N

** Also pressuring shares of oil companies are crude prices which were down marginally O/R

(Reporting by Sumit Saha in Bengaluru)

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