SpaceX opened the door. Now the rest of the line is forming behind it.
Less than two weeks after SpaceX made history with the largest IPO ever recorded – raising $75 billion at a $1.77 trillion valuation and closing its first trading day up nearly 19% at $161 – both OpenAI and Anthropic have filed confidential S-1s with the SEC. The AI IPO window isn’t just open. It’s wide open, and the capital being drawn into this market is unlike anything since the dot-com era.
Two Companies. Two Very Different Stories.
Anthropic moved first. The Claude maker filed its draft S-1 on June 1, 2026, with a valuation that has ballooned to roughly $965 billion following a $65 billion Series H-1 round in May. It projects breaking even by 2028 – two years ahead of OpenAI’s 2030 target – a distinction institutional investors are likely to price as a meaningful premium. Amazon and Alphabet have combined committed capital exceeding $70 billion across equity stakes and infrastructure obligations. That kind of backing provides a floor most pre-revenue tech companies can only dream about.
OpenAI filed its own confidential S-1 on June 8, just one week after Anthropic. The company, last valued at $852 billion post-money, hasn’t picked a listing date yet. And there are real questions underneath the headline number – its CFO has reportedly flagged concerns over whether the company can sustain its massive data center spending pace, and it’s disclosed missing its own user and revenue targets per recent reporting.
Why This Matters Beyond the Hype
Here’s what the market is really pricing: two companies with fundamentally different revenue profiles, both racing to claim the narrative of being the defining AI infrastructure platform of the decade. Anthropic led global LLM revenue share in Q1 2026 at 31.4%, narrowly ahead of OpenAI at 29% – a statistic that, a year ago, would have seemed impossible.
The part people keep glossing over is portfolio displacement. To make room for SpaceX, OpenAI, and Anthropic, fund managers may have to sell existing tech holdings – semiconductors, cloud, AI infrastructure names. That rotation risk is real and is already showing up in the tape.
The 2026 IPO pipeline is shaping up to raise more capital than all U.S. listings combined since 2022. Whether the market can absorb it cleanly – or whether the weight of it causes disruptions in global capital markets – is the question no one has a clean answer to yet.
One thing is clear: the window is open. Whether it stays open long enough for all three companies to walk through it on their own terms is the real story to watch.
For informational purposes only.
