A Year of Big IPOs Will Change Markets
Takeaways:
Major AI and aerospace IPOs could reshape public markets in 2026
Nasdaq’s proposed “fast entry” rule may accelerate index inclusion for large new listings
Passive investors may face increased exposure to newly public companies with limited trading history
2026 is shaping up to be one of the most consequential years for IPOS in recent history. Artificial intelligence giants Anthropic and OpenAI are racing to go public by the end of the year, with valuations of $380 billion and almost $1 trillion respectively. Elon Musk’s SpaceX also plans to IPO at an $800 billion valuation. With an aggregate valuation of over two trillion dollars for just these three companies, and perhaps higher realized market capitalizations once trading begins, investors are excited to say the least. This excitement has caught the attention of Nasdaq, which has proposed new changes to their index qualifications.
Under current rules, a company can only be added to the Nasdaq 100 (NDX) if it has traded for a “seasoning period” of at least three months and wait until the annual reconstitution in December. This waiting period causes a disconnect between the index and the general market if a recent IPO exceeds current index constituents in market cap. The newly proposed rule would allow the addition of a company to the Nasdaq 100 after only 15 days. Additionally, new revisions to the weighting system would multiply the market value of the floating shares of a company to determine its weight in the index if its floating shares are a small percentage of all listed and unlisted shares. The importance of this matter lies in the demand created by higher weighted stocks. If the weighting rules are passed, index funds would have to purchase more shares of these companies, despite their actual market cap not warranting that high of a concentration in the fund.
2026 isn’t just unique because of the companies going public, new rules can potentially change the whole market’s infrastructure and dynamic. As these companies start going public, investors should reconsider the indexes they invest in and decide if they are comfortable with the weights given to large IPOs such as Anthropic, OpenAI, and SpaceX.