Almost 17% of Berkshire Hathaway's $328 Billion Portfolio Is Invested in 1 Top Stock That's Up 180% in 5 Years

Core Insights - American Express (NYSE: AXP) has shown significant stock performance, with a price increase of 180% over the past five years, and a total return of 198% when including dividends [1] - Berkshire Hathaway holds a 22.1% stake in American Express, which has increased to represent 16.5% of its overall portfolio due to the company's stock buyback strategy [3] Company Performance - American Express has a strong brand presence in the credit card industry, offering premium cards that appeal to affluent customers, which contributes to its financial success [5] - The company has demonstrated pricing power, with an average fee per card increasing by 75% from 2020 to 2025, and it maintains lower delinquency and charge-off rates compared to industry averages [6] - Revenue (net of interest expense) has grown by 120% over the past decade, while diluted earnings per share have increased by 205%, with long-term growth targets set at 10% for revenue and mid-teens for earnings [7]