UnitedHealth’s stock is plunging on higher medical costs. That may mean trouble for more insurers

Republicans are voicing concerns about Musk’s downsizing efforts, which include closing some Social Security offices and curtailing telephone services.

Here’s what you should know about the impending trade penalties.

Nvidia shares plunged 17% on Monday, resulting in a market cap loss of close to $600 billion, the biggest drop ever for a U.S. company.