Shares of some of UnitedHealth’s peers got a bump in the wake of Berkshire’s investment in the healthcare giant, and they all look cheaper based on price relative to expected earnings.

Shares of UnitedHealth Group surged nearly 14% on Friday after billionaire Warren Buffett's Berkshire Hathaway bought 5 million shares of the company, providing a shot in the arm for investors who think the health conglomerate will turn around under its new CEO.

The company may be under criminal investigation for alleged irregularities in its Medicare business—but it's been touched by the Warren Buffett effect.

The market is closed for the week. Let's just call it one strange week. President Donald Trump just landed in Alaska, where he's expected to meet with Russian President Vladimir Putin. Long-foreshadowed,

The blue-chip Dow was on track to open at a record high on Friday, underpinned by expectations of an interest rate cut in September and gains in UnitedHealth's shares after Berkshire Hathaway raised its stake in the health insurer.