BUZZ-US energy firms rise on supply worries after Trump's tariffs

S&P 500 Energy index .SPNY rises 0.2% as oil prices extend gains O/R

Brent crude futures LCOc1 up 1.2% at $76.75/barrel and U.S. West Texas Intermediate crude futures CLc1 up 1.1% at $73.16/barrel

Both contracts registered gains of close to 2% in the previous session after three consecutive weekly losses

Oil prices rose amid concerns over Russian and Iranian oil supplies and sanctions threats, despite worries that escalating trade restrictions could dampen global economic growth

Shipping of Russian oil to leading importers China and India has been disrupted by U.S. sanctions targeting tankers, producers and insurers

Adding to supply concerns are U.S. sanctions on Iranian oil shipping networks to China after President Donald Trump restored his "maximum pressure" on Iranian oil exports last week

Shares of oil and gas major rise; Exxon Mobil XOM.N up marginally and Chevron CVX.N gains 1%

Devon Energy DVN.N, Diamondback Energy FANG.O, APA Corp APA.O and Phillips 66 PSX.N rise between 1.1% and 3.7%; among top percentage gainers on the energy index

Oilfield services firms Halliburton HAL.N and Patterson-UTI Energy PTEN.O up 1.1% and 1.7%, respectively