S&P 500 investors are playing it safer in 2025 — so Warren Buffett's careful stock-picking is in style again.

The first high-flying AI stock Warren Buffett secretly owns is industry-leading networking-solutions provider Broadcom (NASDAQ: AVGO). New England Asset Management closed out the third quarter with 19,855 shares of Broadcom, which has a present-day value of nearly $4.5 million.

Warren Buffett is widely considered one of the greatest investors ever because he has delivered excellent returns for a long time. The Oracle of Omaha's investing strategy was effective 10 years ago.

In a famous Arthur Conan Doyle story, “The Adventure of Silver Blaze,” Sherlock Holmes draws the attention of Scotland Yard’s Inspector Gregory to the “curious incident of the dog in the night-time.” Gregory,

When I make reference to Buffett's favorite stock, I'm talking about none other than Berkshire Hathaway itself. Buffett has authorized the repurchase of $77.8 billion worth of Berkshire stock since 2018, which is more than twice the amount the conglomerate invested in Apple.

Warren Buffett stock American Express is flashing a bullish signal after breaking out, with earnings due next week. American Express stock wavered in buy range on Thursday. Also, American Express on Thursday announced it would pay a roughly $230 million settlement following a Department of Justice criminal wire fraud investigation.