In May 2026, a new wave of IPO activity swept the artificial intelligence sector. SpaceX (under Elon Musk and now including xAI) has formally filed IPO paperwork, OpenAI is preparing to submit an S-1 registration statement in the near term, and Anthropic also plans to complete an IPO within the year. The three leading AI companies moving almost simultaneously toward public markets marks the industry’s shift from cash-fueled expansion to capital realization and value testing.

According to multiple media reports, SpaceX secretly filed an S-1 with the U.S. Securities and Exchange Commission (SEC) in early April 2026, planning to list in June, with a potential valuation of $1.25 trillion to $1.75 trillion. If successful, it would be among the largest IPOs in history. The company has completed a merger with xAI, bringing its AI business into the listing entity.

OpenAI is also accelerating its IPO process. Reports say its banking team has prepared the prospectus and may file as soon as this week or in the near term, targeting a September 2026 or fourth-quarter listing, with a valuation goal close to $1 trillion.

Anthropic is likewise active. The company has hired law firms to prepare for an IPO, targeting as early as October 2026, and its valuation has approached or exceeded $900 billion.

Background and motivations for the three giants' IPOs

SpaceX (including xAI):

SpaceX has integrated xAI and combined rocket launches, Starlink satellite internet and AI compute into a "space + AI" narrative. Construction of the Colossus supercluster and AI infrastructure deployment are core growth stories. The IPO is not only about fundraising but also a strategic step by Musk to realize synergies between AI and aerospace.

OpenAI:

As the undisputed leader in AI, OpenAI delayed a listing amid complex equity ties with Microsoft and litigation involving Elon Musk. With those disputes settled and revenues growing rapidly (annualized revenues now in the tens of billions), the company is preparing for the public market. OpenAI hopes the IPO will help attract talent, expand influence and fund continued heavy compute investments.

Anthropic:

Anthropic is known for safety alignment and enterprise applications, with the Claude series performing strongly in coding and agent tasks. The company has maintained deep collaborations with Amazon and Google and achieved robust revenue growth. Its IPO plan signals a shift from a research-first, safety-oriented company to a mature commercial AI leader.

Industry signals behind the IPO wave

1. An exit window for AI capital opens

The year 2026 has been called the "AI IPO year." The three giants' combined valuations could exceed $3 trillion. If all list successfully, they would inject significant liquidity into Silicon Valley and global capital markets and provide major exits for early investors.

2. Compute and commercialization as core competitive advantages

All three companies are heavily investing in compute infrastructure. SpaceX's Colossus cluster, OpenAI's deep ties with Microsoft, and Anthropic's multi-cloud strategy reflect the industry consensus that "compute is the moat." Post-IPO, they will have more capital for next-generation model training and global expansion.

3. Regulatory and governance tests

AI companies going public will face heightened regulatory scrutiny, including data privacy, model safety, intellectual property and valuation rationality. Although litigation involving OpenAI and Musk has been resolved, similar governance issues may be amplified in the public market.

4. Pressure on small and mid-size AI firms

Headliners listing will further widen the gap with mid-tier companies. Capital will concentrate among a few players,