Last year was a great one for stocks, with the S&P 500 confirming its presence in a bull market and soaring 23% for a second consecutive year of gains. Now, heading into 2025, that momentum could continue thanks to ongoing excitement about artificial intelligence (AI) stocks and the benefits of a lower interest rate environment.

Warren Buffett is known for his investing success, generating market-beating returns over the long run. As chairman, he's helped Berkshire Hathaway deliver a compounded annual gain of more than 19% over 58 years -- that's as the S&P 500 posted a compounded increase of about 10% during that period.

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,

Warren Buffett is a big fan of portfolio concentration and placing large wagers on his best ideas. Kicking off 2025, roughly 80% ($238 billion) of the $297 billion portfolio Buffett is overseeing at Berkshire is invested in just nine unstoppable stocks.

Warren Buffett's Berkshire Hathaway owns one of the world's most closely watched stock portfolios. It holds stakes in 46 stocks and exchange-traded funds that are worth $296.8 billion, or 30% of its entire market capitalization.

American Express is an iconic finance company. Chevron is an iconic energy company. American Express' stock price has roughly doubled since the end of 2023 while Chevron's stock has stagnated.  Chevron couldn't be more different.

Berkshire Hathaway chairperson Warren Buffett didn't earn his billions overnight -- he adopted an investing strategy that slowly and steadily built him a fortune. Find Out: 15 Investments