Each quarter, investors wait for Warren Buffett's company Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) to file its 13-F form with the Securities and Exchange Commission, disclosing what stocks the company owned at the end of each quarter.

AWS is still a minority of Amazon's total overall business. But due to AI demand, this segment is commanding more attention. In 2024, AWS generated nearly $108 billion in revenue, comprising around 17% of Amazon's total sales. That's up from $91 billion in revenue in 2023, which represented just 15.8% of Amazon's revenue that year.

Both stocks trade above their five-year median, likely due to recent guidance. American Express expects 8% to 10% revenue growth and 12% to 16% adjusted EPS growth for 2025, while Visa projects "low double-digit" revenue and "low teens" adjusted EPS growth for its fiscal 2025.

The latest 13F filings from Berkshire indicate some further net selling and possible motives. Read more to see my thoughts.

Based on the fourth-quarter 13F filing, Buffett's cash hoard is likely to have swelled even further when the company's annual report is revealed later this month. In addition to the two S&P 500 ETFs, Berkshire's notable sales in the fourth quarter included:

Warren Buffett is unquestionably the world's greatest investor. Since becoming CEO of Berkshire Hathaway (NYSE:BRK-A)(NYSE:BRK-B) in 1965, he has generated cumulative returns of 4.7 million percent. Yowser.