Yet as UnitedHealth's stock declined, Buffett's Berkshire Hathaway Inc. (BRK.B) (BRK.A) stepped in and bought 5.04 million shares, a stake valued at $1.57 billion as of June 30's close.

Presently, he has 30% of his portfolio invested in two brilliant artificial intelligence (AI) stocks: 9% is allocated to Amazon (NASDAQ: AMZN) and 21% is allocated to Uber Technologies (NYSE: UBER).

Although President Trump's tariff and trade policy is headline news, another factor is of far greater importance to the stock market.

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NEW YORK — U.S. stocks edged back from their record levels on Friday in a quiet finish to another winning week. The Standard ...

U.S. stocks edged back from their record levels on Friday in a quiet finish to another winning week.

U.S. stocks are hanging around their record levels as Wall Street heads toward the finish of another winning week.

NEW YORK (AP) — U.S. stocks edged back from their record levels on Friday in a quiet finish to another winning week.