According to the source, American Express has launched blockchain-based passport stamps on Base, enabling cardholders to mint, collect, and share travel memories as customizable NFT stamps. According to the source, the product is issued on Base, directly tying the experience to on-chain NFT activity on that network.

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.