U.S. stock futures largely pointed to gains early Friday ahead of a summit between President Donald Trump and Russia's leader Vladimir Putin. Dow Jones Industrial Average futures were up 321 points, or 0.7% S&P 500 futures were climbing 0.3% and Nasdaq 100 futures were broadly flat. The Dow’s outperformance is likely to be partly driven by component UnitedHealth, which was up 11% in after-hours trading Thursday following the disclosure that Warren Buffett’s Berkshire Hathaway had bought a stake in the health insurer.
