According to The Kobeissi Letter, Berkshire Hathaway's latest disclosure shows that 71% of the aggregate fair value of their equity portfolio is concentrated in just five stocks: American Express, Apple, Bank of America, Coca-Cola, and Chevron (source: The Kobeissi Letter, May 3, 2025). This high concentration suggests that any significant price movement in these stocks could disproportionately impact Berkshire's overall portfolio performance, which is a critical factor for traders and investors monitoring portfolio risk and sector exposure.