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 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.

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.

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.

Andrew Witty is stepping down from his position as UnitedHealth's CEO for personal reasons, insurer says in surprise announcement.

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

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.