The private markets are running out of room. SpaceX, OpenAI, and Anthropic, the three companies most likely to define the next decade of technology, are each approaching valuations that used to be reserved for countries, not startups. Their combined implied market cap now sits at an estimated $3.7 trillion, roughly the GDP of Germany.

And all three are moving closer to going public.

The numbers behind the trillion-dollar club

SpaceX is targeting a market valuation of $1.5 trillion for its eventual IPO. That would make Elon Musk’s rocket company more valuable at listing than every publicly traded aerospace and defense firm in America combined. OpenAI, the company behind ChatGPT, is aiming for around $1 trillion. Anthropic, the safety-focused AI lab founded by former OpenAI researchers, has seen its pre-IPO valuation surge to approximately $1 trillion as well.

Anthropic’s trajectory is arguably the most staggering of the three. The company closed a $30 billion Series G round in February 2026 at a $380 billion valuation. In secondary markets, it’s now valued at nearly three times that amount. That’s a 733% increase since October 2025.

In English: investors who bought Anthropic shares less than a year ago have already seen their positions increase roughly eightfold on paper. The kind of return that venture capitalists used to wait a decade for is now happening in months.

Prediction markets currently assign a 59% probability to an Anthropic IPO occurring in 2026. Analysts project the broader wave of listings, spanning all three companies, to take place between late 2026 and 2027.

Why three simultaneous mega-IPOs matter

Here’s the thing. The public markets have never absorbed anything like this. Three private companies going public within roughly the same window, each demanding valuations north of $1 trillion, would require an extraordinary amount of capital to flow into new equity.

For context, the largest IPO in history was Saudi Aramco’s 2019 listing, which raised $25.6 billion. The combined capital demands of SpaceX, OpenAI, and Anthropic would dwarf that, even if each company only floats a small percentage of its shares.

This creates a genuine liquidity question. Institutional investors, the pension funds and sovereign wealth vehicles that anchor IPO books, have finite allocations for new positions. When three companies this large come to market in quick succession, something has to give. Either existing public equities get sold to free up capital, or the IPO pricing comes in lower than secondary market expectations suggest.

Neither outcome is particularly comfortable for the current market.

The situation also creates a concentration problem. Public equity markets are already heavily weighted toward a handful of mega-cap tech names. Adding three more trillion-dollar companies, two of which are pure-play AI, would further tilt the balance. Index funds that track the S&P 500 would eventually need to add these names, creating forced buying that could amplify already stretched valuations.

What separates these three from the last IPO wave

The 2021 IPO boom was defined by companies going public on promises. Revenue multiples were sky-high, profitability was optional, and SPACs were treated as a legitimate path to the public markets. Most of those stocks are now trading well below their listing prices.

SpaceX, OpenAI, and Anthropic are a different breed. SpaceX has an actual monopoly on reusable orbital launch, with both government and commercial contracts providing durable revenue. OpenAI has built what is arguably the most widely used consumer AI product on the planet. Anthropic has positioned itself as the enterprise-grade AI provider, with its Claude models gaining traction among businesses that care about safety and reliability.

That said, trillion-dollar valuations for companies that are still burning cash at significant rates, particularly in the case of OpenAI and Anthropic, require a very specific set of assumptions about future revenue growth. AI infrastructure costs remain enormous. The competitive moat in large language models is still being debated. And regulatory frameworks for AI are evolving in real time across multiple jurisdictions.

The companies are betting that their current market positions will translate into durable, high-margin businesses at scale. The public markets will get to decide whether that bet is worth a collective $3.7 trillion.

Look, for investors watching this unfold, the playbook isn’t straightforward. Early allocations in these IPOs will likely be reserved for the largest institutional players. Retail investors will mostly encounter these stocks after they’ve already priced in the initial enthusiasm. The more interesting question might be what happens to existing public AI companies, the Nvidias and Microsofts of the world, when three new trillion-dollar competitors start competing for the same investor dollars. Capital is not infinite, and every dollar allocated to a fresh Anthropic position is a dollar that isn’t going into an existing AI holding.

The secondary market premiums already being paid for Anthropic shares suggest that sophisticated investors believe the IPO pop will be significant. But secondary markets have been wrong before, particularly when the gap between private and public valuations gets this wide. The risk isn’t that these are bad companies. The risk is that even great companies can be bad investments at the wrong price.