A wave of mega-IPOs, including SpaceX, OpenAI, and Anthropic, is poised to hit U.S. markets, potentially raising hundreds of billions of dollars. SpaceX is expected to list in June, followed by OpenAI in September and Anthropic in October. Concerns are mounting that these offerings could drain liquidity from existing equities, particularly as index fund allocations and large-cap positions are already high. Despite fears of a liquidity squeeze, historical data suggests that issuance waves often coincide with strong stock market returns. Deutsche Bank's Parag Thatte notes that while increased supply can cause short-term volatility, it is not a primary cause of market downturns. The U.S. stock market typically experiences pullbacks of over 3% every one to two months, with IPOs being just one potential catalyst. Current demand remains robust, supported by high household cash balances, strong corporate profits, and ongoing buybacks.