Mega-IPO 2026: How SpaceX, OpenAI, and Anthropic are Redesigning the Market
5 JUN, 2026
By Joanna Piwko from RankiaPro Europe
The record quotations of 2026 are not just an investment opportunity: they are a structural event that changes the composition of the indices, compresses software multiples and forces portfolio rotations. Three managers read the risks and opportunities.
The three largest IPOs in history are about to hit the public markets in a short span of time: SpaceX with an estimated issue around 75 billion dollars, OpenAI around 70 billion and Anthropic around 60 billion. In total, over 200 billion dollars of new capital will enter circulation in 2026, surpassing the 2021 record. But the size of the volumes is just the most visible data. Beneath the surface, the mega-IPOs 2026 are already rewriting the rules of index inclusion, redistributing available liquidity and creating asymmetric pressures on those already listed. For those managing portfolios today, the question is not whether to participate in the launch enthusiasm, but to understand what structural mechanisms are being activated and where the real opportunities lie.
How the index rules change with the mega-IPOs 2026
The underlying problem is that SpaceX, OpenAI and Anthropic would not have met the traditional requirements for index inclusion. Wolf von Rotberg, Equity Strategist at J. Safra Sarasin, explains it precisely: with a valuation up to 2,000 billion dollars, a free float of 75 billion would represent less than 4% of SpaceX's capitalization, well below the minimum threshold of 10% set by Nasdaq. To solve the problem, index providers have significantly modified their criteria.
Starting from May 1st, Nasdaq has eliminated the minimum free float requirement and introduced a "Fast Entry" mechanism that allows companies among the top 40 in terms of capitalization to be included after only 15 days of trading, against the previous 12 months. The new rules also introduce a multiplier: with a free float of 4%, SpaceX would receive a weighting in the index equal to 12% of its market capitalization. Von Rotberg warns that "this marks a departure from the market capitalization-based weighting methodology previously applied", with direct consequences on the structure of passive demand.
Forced passive purchases: the mechanism that amplifies post-IPO volatility
This imbalance is not theoretical. Passive funds replicating the Nasdaq will be forced to buy a very limited float in a compressed time frame, with a direct impact on prices. Richard Flax, Chief Investment Officer at Moneyfarm, recalls that indices do not include a company at the time of the IPO and therefore "do not participate in any strong initial increases following the listing", but at the same time "can avoid part of the corrections that often follow the initial phase of enthusiasm": a significant asymmetry for active managers.
Historical data confirm the risk. Von Rotberg (J. Safra Sarasin) highlights that the median return of the 50 largest US IPOs since 2010 has been 12.3% in the first month, but became negative within the first year. Larger IPOs, in particular, tend to record more modest initial gains and more marked corrections in the following months. "The criteria for earnings stability, price determination and free float criteria have been abandoned to allow rapid inclusion in the index. This weakens the quality of the index and could lead to greater volatility", concludes von Rotberg.
Mega-IPOs absorb liquidity and compress software multiples
The most immediate effect for those already invested does not come from new titles, but from the pressure that emissions exert on the existing allocation. Flax (Moneyfarm) observes that "a significant increase in IPOs could result in greater selling pressure on existing securities", because managers participating in new listings often have to free up liquidity by reducing positions already in the portfolio.
Nadège Dufossé, Global Head of Multi-Asset at Candriam, identifies precisely where this pressure is concentrated: "the IPOs of some large operators could channel several trillion dollars of capital in the second half of the year. Even if the emissions were distributed over time, they would still end up absorbing liquidity and intensifying competition for capital allocation, just as some areas of the software ecosystem are already undergoing a compression of multiples." The SaaS segment is the most exposed, because AI threatens both the power of price determination and long-term margins.
Where to find value in tech stocks today
Despite the structural pressure, the investment cycle in AI maintains an extraordinary demand visibility. Dufossé (Candriam) points out that with "over 700 billion dollars of investments expected from hyperscalers in AI infrastructure in 2026, the ecosystem continues to benefit from an exceptionally robust demand visibility", with sustained orders and earnings revisions that continue to improve in the Technology, Energy and Materials sectors.
Not all tech companies are equivalent under pressure, however. Dufossé (Candriam) clearly distinguishes: companies related to cybersecurity, data protection, storage and mission-critical infrastructures "appear structurally better positioned, as their products are less easily replaceable and can even become more important in a context more oriented towards AI." Flax (Moneyfarm) adds a fundamental macro reading: "the current trend of stock markets is mainly supported by the growth of corporate earnings rather than an excessive expansion of valuations", a sign of structurally healthier health compared to historical speculative cycles such as the Dot-Com between 1995 and 2001.
Conclusion
The mega-IPOs 2026 should be read as a systemic reallocation event, not as a simple favorable quotation cycle. They change the rules of the indices, force passive purchases on reduced floats, drain liquidity from existing securities and accelerate internal differentiation in the tech sector. The potentially high volatility in the post-launch period requires maintaining exposure within manageable levels, favoring companies with visible earnings and defensive positioning in the AI ecosystem. As von Rotberg (J. Safra Sarasin) summarizes, "the next three IPOs are different from any previous case": recognizing this discontinuity is the starting point for any rational portfolio decision in the second half of 2026.
Disclaimer: This article is for informational purposes only and does not constitute financial, tax or legal advice, nor an offer to buy or sell financial instruments. The opinions reflect the evaluations of the respective management companies at the date of publication and are subject to change without notice. Past performance is not a guarantee of future results. Emerging market debt involves specific risks: currency volatility, geopolitical risk, liquidity risk, sovereign and corporate credit risk.
