Anthropic IPO Filing Hands Amazon and Google a Quiet Windfall

Anthropic, the maker of the Claude family of artificial intelligence models, confidentially filed a draft S-1 registration statement (the document a company files with regulators before selling shares to the public) with the U.S. Securities and Exchange Commission on Monday, the first formal step toward an Anthropic IPO that could value the company near $965 billion. The company disclosed the move under a narrow publicity rule and said the number of shares and the offering price have not been set.

Two of Anthropic’s largest backers, Amazon and Google, have a more direct interest in how this listing prices than the announcement lets on. Both have booked billions of dollars in paper gains on their stakes, and a public market would finally put a tradable number on holdings that have so far lived only on private term sheets.

What Anthropic Filed With the SEC, and the Timing Behind It

The announcement was made under Rule 135 of the Securities Act, which lets a company confirm it has begun the registration process without marketing the deal. A confidential submission means Anthropic can trade comments with the Securities and Exchange Commission (SEC, the federal markets regulator) in private before any financials become public. The company said the filing gives it the option to go public once the SEC finishes its review, subject to market conditions.

The timing is not random. The draft landed days after Anthropic closed its Series H round, raising $65 billion at the $965 billion post-money mark that pushed it past OpenAI for the first time. That round, led by Altimeter Capital, Dragoneer, Greenoaks and Sequoia Capital, is widely treated as the company’s last private raise before a listing.

Behind the valuation sits a revenue curve that explains the urgency. Anthropic’s annualized run-rate crossed $47 billion earlier in May, up from a roughly $30 billion run-rate at the start of the year and about $10 billion in annual revenue the year before. Enterprise demand for Claude in coding and agentic workflows is driving the climb, and the company has been pairing fresh capital with multi-gigawatt compute deals from Amazon, Google and Broadcom.

The path to this filing runs through three fast steps:

1. February 12, 2026: Anthropic closes its Series G at a $380 billion post-money valuation, raising $30 billion led by GIC and Coatue.
2. Late May 2026: The Series H raise of $65 billion lifts the valuation to $965 billion, eclipsing OpenAI’s $852 billion mark from March.
3. June 1, 2026: Anthropic confirms it has confidentially submitted its draft S-1, opening the door to a listing as soon as this fall.

You can read the full terms in the announcement of Anthropic’s $65 billion Series H round, and Budgy App covered how Anthropic’s valuation overtook OpenAI when the round priced.

The Two Backers Sitting on the Biggest Paper Gains

Amazon and Google are not named in most coverage of the filing, yet they are the investors with the most exposure to the outcome. Amazon committed up to $8 billion across multiple rounds and is the single largest outside investor, while Alphabet, Google’s parent, built a stake estimated near 14 percent before pledging a further $40 billion. Neither holds the kind of control that the dollar figures might imply.

The structure matters for how a listing plays out. Both companies are passive holders by design, which kept regulators comfortable as the checks grew. It also means their upside is purely financial: when Anthropic’s value rises, their balance sheets move, even though neither runs the company or sells a single share.

How Anthropic Markups Propped Up Big Tech Profits

The clearest sign of the stakes showed up in first-quarter earnings. Amazon reported that its net income included pre-tax gains of $16.8 billion in non-operating income from its Anthropic investments, a markup tied to the higher valuation rather than to anything sold. Amazon’s original commitment, carried at roughly **$74.2 billion** as of March 31, has become one of the most valuable positions on its books.

Alphabet’s quarter told a similar story. Across both companies, analysts estimated that roughly half of the standout AI-linked profit in the period came from Anthropic stake markups rather than from their core advertising and cloud operations. The accounting trigger was the Series G close in February, which reset the valuation and forced an upward revaluation under fair-value rules.

Here is what that dependence looks like in numbers:

• $16.8 billion in pre-tax Anthropic gains flowed through Amazon’s non-operating income in the first quarter.
• $74.2 billion is the reported value of Amazon’s stake, against a commitment of up to about $8 billion.
• Roughly half of the two firms’ headline AI profit for the quarter traced back to Anthropic rather than operations.

None of those gains are cash. They are mark-to-market entries that rise or fall with each new valuation, which is exactly why a public price tag changes the picture. Until now, the number behind these gains came from private rounds the backers helped set. A listing replaces that with a price the open market decides every trading day.

The Three-Way Race to a Wall Street Debut

Anthropic is not filing into an empty calendar. Elon Musk’s SpaceX submitted financial information in late May toward its own listing, and OpenAI, the maker of ChatGPT, has been widely reported to be planning one as well. Analysts at Wedbush Securities cast the cluster as a turning point for a market that had gone quiet.

We believe this represents an opening of the floodgates for the IPO market, which has been relatively dormant for a few years, with these three major conglomerates set to go public later this year, but this has turned into a race to reach public markets over the coming months.

That note, from Wedbush Securities after Anthropic’s announcement, frames the wider bet. Taken together, the three companies could carry close to $3 trillion in combined market value onto public exchanges within months of one another.

The lineup, by current standing, breaks down like this:

• Anthropic: confidential S-1 filed, valued near $965 billion after its Series H raise.
• OpenAI: reported to be preparing a listing, last valued at $852 billion after a $122 billion round in March.
• SpaceX: filed financial information in late May, blending rocketry and AI exposure.

What Public Price Discovery Could Expose

A listing cuts both ways for the backers. The same mechanism that has lifted Amazon and Alphabet earnings on the way up can reverse on the way down, and a public stock reprices in real time rather than once every funding round. Lockup rules would also keep large holders from selling immediately, so the paper gains stay paper for a while even after the bell rings.

The financials a prospectus eventually reveals will get harder scrutiny than a private deck. Anthropic is spending heavily on compute and data centers, and the company’s costs have been climbing alongside its revenue. Investors who only saw the valuation headlines will, for the first time, see the losses, the customer concentration and the compute commitments laid out in full.

There is a mood problem too. The filing arrives during a stretch of intense enthusiasm for anything tied to AI infrastructure, with chip and supply-chain stocks running hot, even as public polls show many Americans uneasy about how the technology affects daily life. That gap between investor appetite and public sentiment is the kind of tension a debut can test quickly. For more on Anthropic’s frontier work, Budgy App reported on how Anthropic plans to brief regulators on cyber findings from its latest Claude model.

Primary numbers behind the backers can be tracked through Amazon’s quarterly earnings releases and Alphabet’s investor relations filings, where the Anthropic mark appears as a separate line.

Frequently Asked Questions

Can Retail Investors Buy Anthropic Stock Right Now?

No. Anthropic has only submitted a confidential draft S-1, which is an early step, not a live offering. Shares are not trading on any exchange, no price has been set, and the company has not said when, or whether, the IPO will proceed.

When Could the Anthropic IPO Happen?

Reports point to a possible listing as soon as this fall, but Anthropic has stressed that any offering depends on market conditions and the completion of the SEC review. A confidential filing can sit for months before a company moves to a public registration.

How Much Is Anthropic Worth?

Anthropic was valued at $965 billion post-money after its Series H round raised $65 billion in late May, surpassing OpenAI’s $852 billion valuation from March and making it the most valuable AI startup.

Who Are Anthropic’s Biggest Investors?

Amazon is the largest outside backer, with commitments of up to roughly $8 billion, while Alphabet holds a stake estimated near 14 percent and has pledged a further $40 billion. Venture firms including Altimeter Capital, Sequoia Capital, GIC and Coatue have also led recent rounds.

Do Amazon or Google Control Anthropic?

No. Despite the size of their investments, both are passive holders. Amazon has no controlling stake and Google holds no voting rights, no board seats and no board observer rights, an arrangement designed to limit regulatory concern.

Disclaimer: This article is for informational purposes only and is not investment advice. Securities and pre-IPO investments carry significant risk, including the loss of capital, and private valuations may differ sharply from public-market prices. Readers should consult a qualified financial professional before making investment decisions. Figures are accurate as of publication.