US energy stocks gain as oil tops $100 on supply fears

** S&P 500 energy index .SPNY up 1.8%, tracking higher oil prices O/R

** Brent crude futures up 2.9% at $109.02 a barrel, after hitting its highest since September 14

** US West Texas Intermediate crude rise 2.6% to $100.52 a barrel, crossing $100 for the first time since September 21

** Prices gain more than 3%, heading for weekly gains on continued uncertainty over Middle East supplies, and as investors kept assessing how much diesel Russia could supply to the global markets

** Energy majors ExxonMobil XOM.N up 1.9% and Chevron CVX.N gains 2.2%

** EOG Resources EOG.N, Diamondback Energy FANG.O, ConocoPhillips COP.N and EQT Corp EQT.N up between 3.3% and 3.7%, among the top percentage gainers on the energy index

** Oilfield services companies Baker Hughes BKR.O up 2.5% and SLB SLB.N gains 2.6%

** Refiner Phillips 66 PSX.N up 1.4%