San Francisco, California.
For the first time in Silicon Valley, the two most valuable private AI companies quietly asked regulators for permission to go public in the same month. Just seven days apart, both filed the paperwork that begins the process for a stock market debut, but neither has said when trading will actually start.
This is the story behind the OpenAI S-1 filing and the Anthropic S-1 confidential submission. Two events that arrived within a week of each other in June 2026 and quickly became the main focus of this year’s AI IPO 2026 cycle. Anthropic filed first, submitting its draft registration to the SEC on June 1. OpenAI followed on June 8, confirming the news in a blog post before reporters could break it themselves. Investors searching for “OpenAI Anthropic both filed confidential S-1 IPO June 2026 what investors need to know” are really asking a single question: which of these two giants get to Wall Street first, and does it matter which one wins that race?
Two Filings, Two Very Different Postures
Anthropic’s filing came five days after it closed a $65 billion Series H round, a raise that pushed the company’s valuation to roughly $965 billion. The Anthropic $965 billion valuation of IPO narrative has become shorthand across trading desks for a company that, according to reporting cited by Fortune, is closing in on its first quarterly profit. That detail is important more than it might seem. Confidential S-1 filings do not disclose financials publicly, but the private fundraising math around Anthropic has consistently pointed toward a business burning less cash relative to revenue than its chief rival.
OpenAI is taking a different approach. The company was last valued at $852 billion in March 2026, but CEO Sam Altman reportedly set his sights well above that figure before ringing the opening bell. The OpenAI $1 trillion IPO target is not a rumor plucked from thin air; it reflects Altman’s stated preference to list only when the company can command a valuation north of $1 trillion, according to people familiar with internal discussions, as reported by Bloomberg. OpenAI’s announcement made the uncertainty clear: “We have not decided on timing yet,” the company said, noting that some strategies are easier to carry out as a private company.
Why the Delay Talk Started
A June 26 Bloomberg report changed how analysts perceive the timing. Advisors close to OpenAI are encouraging the company to wait until 2027 to go public rather than in late 2026. Their reasoning is based on what happened with SpaceX: after its IPO at $135 a share on June 11, the stock soared to $225, then lost about a third of its gains as excitement faded. For OpenAI’s board, this kind of volatility is a real example of how quickly market mood can shift when a major tech company starts trading.
That is the context behind the OpenAI IPO 2027 to delay conversation now circulating among bankers. Anthropic, on the other hand, has not shown the same hesitation. Its confidential filing started a regulatory review that, for a company of this scale, typically runs three to six months, putting a public prospectus release around September 2026 and a first trade date potentially in October. Anyone tracking the phrase “OpenAI IPO delayed 2027 Anthropic IPO timeline what retail investors need to prepare for” is watching two clocks that no longer run at the same speed. Anthropic also overcame a political hurdle in mid-June when the Trump administration said it no longer considers the company a national security concern, removing a regulatory barrier.
The AI Company IPO Pipeline Gets Crowded
Anthropic and OpenAI are not filing into an empty market. SpaceX’s own S-1 landed just weeks earlier and set the mood for the entire AI company IPO pipeline heading into the back half of 2026. When a company worth close to $2 trillion opens its doors to public markets, every other name in the hallway feels pressure to move through them while capital and attention are still available. Investment bankers describe the current moment as the most consequential stretch of technology listings since the dot-com era, with Goldman Sachs and Morgan Stanley advising both OpenAI and Anthropic on their respective processes.
There is more at stake than just being first. The company that lists first sets the valuation standard the other will have to match or beat. Some analysts think that if Anthropic goes public before OpenAI, it could reduce investor interest in OpenAI, especially since their profitability paths differ. Others believe a strong Anthropic debut could actually help OpenAI by proving that frontier AI is a solid investment, making its own IPO easier to price.
The IP Question Neither Company Can Avoid
Another issue has made both companies’ filings more complicated than investors expected. On June 10, Anthropic sent a letter to the Senate Banking Committee accusing people linked to Alibaba’s Qwen AI lab of carrying out the largest known distillation attack on its models. They claimed about 28.8 million exchanges with Claude happened through nearly 25,000 fake accounts between April 22 and June 5. Distillation means training a weaker model using the outputs of a stronger one, copying its abilities without copying its code. Two days after the letter, the Commerce Department restricted global access to Anthropic’s newest models, Fable 5 and Mythos 5, because of national security concerns. The company had to disable them worldwide, but restored access at the start of July.
The episode illustrates a risk factor that any S-1 from a frontier AI lab now has to address directly: how durable is the underlying model IP once it becomes a company’s primary balance sheet asset? Public market investors evaluating either the OpenAI S-1 filing or the Anthropic S-1 confidential draft will want clear answers on how each company defends its model weights and training data against extraction attempts, and how much that defense costs on an ongoing basis. It is no longer a footnote. It is a line item.
What Retail Investors Can Do Right Now
Neither company has declared a ticker, exchange, or price range yet, since confidential filings stay private until closer to the IPO. This means retail investors have few direct options right now, but there are still things to watch. How SpaceX’s stock performs in the coming weeks can preview how the market might treat new tech IPOs once early volatility passes. Looking at each company’s public comments on profitability—especially since Anthropic has shared more about its path to positive earnings than OpenAI—can help investors judge which company’s finances are stronger. It’s also important to follow the distillation dispute and related legislation, as new laws could change how AI intellectual property is protected and affect company valuations.
The two filings came just a week apart, but the companies are now on different paths. One is moving quickly toward an October debut with a strong story about profitability. The other is deciding if it should wait for a higher valuation. Retail investors don’t have to choose sides yet. They should keep an eye on the calendar, since the next update—a public prospectus, a roadshow date, or a price range—could come from either company at any time.
