Elon Musk became the world's first trillionaire after shares of his rocket company SpaceX soared in Wall Street's biggest initial public offering of stock.
Wall Street keeps setting more records, and excitement about the artificial-intelligence industry keeps leading the way.
Berkshire Hathaway bought around 5 million shares of UnitedHealth last quarter, according to a regulatory filing. The stake was valued at about $1.57 billion.
Tesla is awarding CEO Elon Musk 96 million shares of restricted stock valued at approximately $29 billion, just six months after a judge ordered the company to revoke his massive pay package.
Stocks tumbled on Friday in response to the sweeping new levies.
U.S. stocks are climbing, and the price of oil is tumbling Monday on growing hopes that Iran will not disrupt the global flow of crude.