(Reuters) -Futures tracking the Dow and the S&P 500 were higher on Friday, underpinned by expectations of an interest rate cut in September, while UnitedHealth surged after Berkshire Hathaway raised its stake in the health insurer.

UnitedHealth Group gained more than 12% in premarket trading after Warren Buffett’s company revealed a new investment in the health insurer, while a securities filing also showed Michael Burry’s Scion Asset Management included bullish positions in the company.

Rising costs in the broader healthcare sector and an about 46% slump in heavyweight UnitedHealth’s shares this year have left the blue-chip Dow lagging its Wall Street peers on the road to record highs.

This week however, the healthcare sector is the top performer on the benchmark S&P 500 and is on trac

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