Nvidia and AMD extend gains after the chip makers sign deals with Saudi Arabia, shares of Super Micro Computer surge for a second day, and UnitedHealth claws back some losses from the previous session.

UnitedHealth Group shares rebounded modestly Wednesday following yesterday's crash, with analysts from UBS, Oppenheimer, and Morgan Stanley leaving their ratings unchanged after the health insurer pulled its outlook and announced its CEO had stepped down.

Even UnitedHealth will struggle to overcome parasitic medical costs that Warren Buffett once called a tapeworm eating away at U.S. economic competitiveness. The $300 billion healthcare conglomerate reinstalled Chairman Stephen Hemsley as CEO and yanked its financial guidance.

UnitedHealth Group Incorporated's stock faces a steep decline amid leadership turmoil, regulatory pressures, and rising costs. Click to read why UNH is a Hold.

UnitedHealth Group Inc.’s new Chief Executive Officer Stephen Hemsley will receive $1 million in annual base salary as well as a one-time $60 million equity award as he returns to helm the beleaguered insurer.

UnitedHealth Group CEO Stephen Hemsley, who replaced Andrew Witty, said he has the right strategy in place “for the era ahead.”

The White House unveiled what it says is $600bn worth of defence and artificial intelligence deals with Saudi Arabia, UnitedHealth Group shares sink to the lowest level in more than four years, and US inflation fell to 2.3 per cent in April. Plus, Nissan plans to axe 15 per cent of its global workforce and almost halve its number of plants.

UnitedHealth has been hammered in a number of ways: increased costs, political pressure over its size, and scrutiny by the Federal Trade Commission and Department of Justice. Cong

Stephen J. Hemsley returned as CEO after Andrew Witty's surprising decision to leave the insurance giant. UnitedHealth's stock fell 17% on Tuesday.

John Ransom, Raymond James director of healthcare research, joins 'Power Lunch' to discuss why Ransom has pause on shares of UnitedHealth, why the company withdrew its guidance, and much more.