Anthropic, the company behind the Claude AI, has chosen Nasdaq as the stage for what may become one of the most consequential public offerings in recent memory — a decision that carries implications not just for the company, but for the hundreds of millions of ordinary investors whose index funds could automatically absorb a piece of it. A rule adopted by Nasdaq in May 2025 allows sufficiently large newcomers to join the Nasdaq-100 within 15 trading days of listing, meaning the market's machinery, not individual choice, would deliver exposure to a company valued near $2 trillion. In this way,