The U.S. initial public offering (IPO) market appears to be entering one of its most consequential periods in years. After a long drought following the 2021 issuance boom, a healthier macro backdrop, improved risk appetite, and a long queue of mature private companies have reopened the new-issue window. The potential 2026 class is unusual not only because of the number of companies considering public listings, but because several would be large enough to matter for major equity indexes, passive fund flows, and the broader market narrative around artificial intelligence.