IPO of AI Giants: Open Window or Mirage for Startups?

What Happened?

SpaceX, OpenAI, and Anthropic are preparing to go public in 2026. SpaceX will list on June 4 at $135 per share, raising $75 billion and achieving a valuation of $1.77 trillion, the largest IPO in history. Anthropic filed a confidential application on June 1 with a valuation of $965 billion, and OpenAI did the same on June 8, aiming for a fall listing. After four years of venture capital liquidity drought, many interpret this as the reopening of the IPO window.

However, a closer analysis of sources reveals crucial nuances. According to Crunchbase News, SpaceX will sell 555.6 million shares at a fixed price of $135, representing the largest public offering ever. Anthropic, per Fortune, filed its confidential application on June 1 with a valuation of $965 billion, while OpenAI, per Reuters, did the same on June 8, targeting a fall listing. These figures are staggering, but they should not be taken as a sign of a broad IPO market.

Why Is It Important?

A deeper analysis reveals this is a concentration event, not a widespread revival. SpaceX's raise alone exceeds the $47.4 billion that the entire U.S. IPO market raised in 2025, according to EY data. Bloomberg reported that retail investors might have to sell Tesla or Bitcoin shares to fund their orders, and SpaceX is reserving up to 30% of the deal (about $22.5 billion) for that same high-risk audience. The crypto IPO pipeline itself has stalled this year, per CoinDesk, as capital rotates toward AI. These three companies could be virtually the entire IPO class of 2026. For early-stage startups, the IPO window remains out of reach.

The real shift is in acquisitions. By going public, SpaceX, OpenAI, and Anthropic become buyers with liquid shares and enormous resources. OpenAI has already closed half a dozen acquisitions this year, nearly matching its 2025 total. AI M&A activity increased 90% year-over-year in the first quarter, according to PitchBook data. Since most venture capital exits have always been through acquisitions, these IPOs deepen the buyer pool far more than they shorten the IPO queue.

What Will Be the Consequences?

For startup founders, the goal must be redefined: not to build for an IPO window that is open only for a few, but to be the company that a newly listed AI giant needs to acquire. Key areas include true ownership of a workflow, proprietary data that accumulates, testing and evaluation infrastructure, or a wedge into a market these platforms want to enter. At the seed stage, the exit math has always pointed toward a single meaningful acquisition.

Historically, large IPOs have not been precursors to a broad market opening. For example, Facebook's IPO in 2012 raised $16 billion, but the IPO market did not broadly revive until years later. Similarly, Alibaba's IPO in 2014, at $25 billion, was an isolated event. In both cases, early-stage startups did not benefit from a wider IPO window. The current situation is even more extreme: SpaceX, Anthropic, and OpenAI could capture over $1.5 trillion in combined valuation, leaving little room for other companies.

Moreover, the impact on retail investors is significant. Bloomberg noted that cash balances in brokerage accounts are low, so many investors will have to sell existing assets, such as Tesla or Bitcoin shares, to participate in SpaceX's IPO. This could put downward pressure on those assets, creating a ripple effect in markets. On the other hand, index funds will be forced to rebalance their portfolios to include SpaceX, potentially distorting indices.

For the venture capital market, these IPOs represent a paradigm shift. Over the past four years, the liquidity drought has forced startups to focus on profitability and smaller funding rounds. Now, with these giants listing, M&A dynamics will intensify. Startups that cannot achieve massive scale must position themselves as attractive acquisition targets. This is already happening: according to Crunchbase, acquisitions of AI startups by large tech companies increased 40% in 2025, and 2026 is expected to surpass that figure.

What Should Readers Know?

Do not be fooled by superficial optimism. The IPOs of SpaceX, OpenAI, and Anthropic are historic, but they are not a sign that the IPO market has opened for everyone. For most startups, the most realistic path to liquidity remains acquisition by these new tech giants. Build to be bought, not to go public.

In summary, we are facing an unprecedented capital concentration event. The IPO window is open only for a chosen few, and the rest of the ecosystem must adapt to a new reality where exits occur primarily through acquisitions. Smart founders are already adjusting their strategies: prioritizing proprietary data generation, developing deep integrations with AI platforms, and building teams that can quickly integrate into larger organizations. The future is not about massive IPOs, but about strategic acquisitions.