On June 1, a company almost nobody outside enterprise software circles had heard of three years ago quietly submitted paperwork that could reshape the entire public market for artificial intelligence.

Anthropic filed a confidential S-1 with the SEC.

Let that settle for a second. A company that did not exist before 2021 is now knocking on the door of a public listing at nearly a trillion dollars in valuation. Not billion. Trillion.

What Actually Happened

Here is the sequence of events, compressed: Anthropic raised $65 billion in a Series H round at a $965 billion post-money valuation in late May 2026. Days later, it submitted its confidential S-1 to the SEC on June 1, 2026, becoming the first major frontier AI lab to formally begin the IPO process. No share price, no share count, no listing date has been set. The timing and structure of any offering remains dependent on market conditions and SEC review.

But the intent is clear. And the race is officially on.

OpenAI confidentially filed around May 22 and is targeting a potential September 2026 debut at a $1 trillion-plus valuation. SpaceX already went public on June 12, raising $75 billion at $135 per share on the Nasdaq under ticker SPCX – the largest IPO in stock market history – and closing its first day up roughly 19% at $161. Goldman Sachs projects 2026 could set a new record for total U.S. IPO proceeds, potentially reaching $160 billion.

Three companies. Combined implied valuation somewhere north of $3.7 trillion. All going public within roughly six months of each other.

The Business Behind the Filing

Anthropic builds and operates the Claude family of large language models. The core monetization engine is API usage and enterprise subscriptions, with Claude increasingly adopted for coding and agentic workflows. That is not a minor market. Revenue run-rate crossed $47 billion annualized in May 2026, up from roughly $9 billion at the end of 2025. That is a pace Anthropic’s own CEO Dario Amodei said outstripped internal forecasts by a factor of eight.

The quarterly picture is just as striking. Anthropic posted $4.8 billion in Q1 2026 revenue. It projected $10.9 billion for Q2 2026 – a 130% sequential jump. For context, that single quarter would exceed Anthropic’s entire 2025 annual revenue. OpenAI, with a four-year head start and the most recognized consumer AI brand on the planet, posted roughly $5.7 billion in Q1 2026 revenue by comparison.

At $965 billion against roughly $47 billion in run-rate revenue, Anthropic is trading at approximately 20x forward revenue on private market terms. That relative discount to OpenAI’s implied multiple is probably the most interesting number in the entire AI IPO wave right now.

The Part People Keep Skipping

Here is where it gets interesting. Anthropic is actually projecting its first-ever quarterly operating profit in Q2 2026 – roughly $559 million on $10.9 billion in revenue. That would make it the first frontier AI lab to post a quarterly operating profit. The company spent 71 cents on compute for every dollar of revenue in Q1. That ratio is expected to drop to 56 cents in Q2.

But Anthropic has been explicit about the caveat: this may not hold. Planned data center spending ramps sharply in the second half of 2026. The company has committed to spend approximately $80 billion on cloud infrastructure through 2029 alone, a figure that does not include inference compute costs, which scale directly with usage. Longer-term projections shared with investors point to $70 billion in revenue and $17 billion in cash flow by 2028, though none of those figures have been audited or publicly confirmed.

There is also a structural wrinkle. Anthropic is a Public Benefit Corporation, meaning its corporate charter legally incorporates obligations beyond shareholder returns. How a public company balances that with quarterly earnings pressure is an open question that will likely dominate the roadshow conversation.

And one more thing worth watching carefully. In February 2026, the U.S. Department of Defense designated Anthropic a supply chain risk and ordered federal contractors to stop using Claude – after Anthropic refused to grant the Pentagon unrestricted access to its models for autonomous weapons and mass domestic surveillance. The dispute spawned two simultaneous lawsuits. A California federal judge granted Anthropic a preliminary injunction in March, temporarily blocking enforcement. The D.C. Circuit denied a parallel motion. As of now, Anthropic remains excluded from DOD contracts while litigation plays out, though President Trump told CNBC in April that a deal is “possible.” The situation is active, not resolved, and investors going into the IPO will need to price it accordingly.

The Capital Flow Problem Nobody Is Talking About

Here is what most retail investors are missing entirely. Money rotating into SpaceX, OpenAI, and Anthropic has to come from somewhere. The most likely source is existing large-cap tech positions. Even investors who never touch a single IPO share could feel this as a headwind in positions they already hold, particularly the hyperscalers and semiconductor names that have dominated portfolios for the past three years.

This is not theoretical. It is math. Some analysts now estimate total 2026 IPO volume at $225 billion or more, with expiring insider lockups adding further selling pressure. The second-order effects on existing large-cap tech valuations deserve more attention than they are currently getting.

Bull, Base, Bear

Bull: Anthropic’s revenue continues compounding at or near its current pace. Gross margins expand as compute costs deflate. The enterprise software moat widens as Claude Code adoption accelerates across Fortune 500 companies. Analysts at Wedbush have called the $965 billion valuation “just the tip of the spear” for the broader AI investment cycle. A public listing above $1 trillion on day one is the scenario they are underwriting.

Base: Growth remains strong but decelerates as competition from OpenAI, Google DeepMind, and open-source models intensifies. The stock prices at valuation but does not compound meaningfully from it for 12 to 18 months post-listing. The first post-IPO profitable full year remains uncertain given planned compute spending increases in H2 2026.

Bear: SEC review forces a gross-to-net revenue restatement. Anthropic reports revenue from cloud resellers like AWS and Google on a gross basis, counting total end-customer spend as revenue and booking partner payouts as expenses. Per multiple analyst estimates, if that accounting gets unwound, headline annualized revenue could drop meaningfully in a single disclosure, and the multiple math that institutions are currently carrying breaks apart. The DOW dispute escalates and commercial clients begin pulling back. Both risks are real and embedded in the confidential filing process.

What You Can Actually Do Right Now

Most retail investors cannot access this before the listing. Pre-IPO exposure is largely limited to accredited investors via secondary markets, employee tender offers, or late-stage venture funds with high minimums and limited liquidity.

What you can do is map the beneficiaries. Amazon and Alphabet are both strategic investors and primary compute providers for Anthropic. Multi-gigawatt cloud agreements with both companies mean any Anthropic revenue growth translates directly into cloud consumption on AWS and Google Cloud. That is a less obvious, more liquid way to express a view on Anthropic’s trajectory right now.

The public S-1, when it comes, will be the most important financial disclosure document in the AI industry’s history. It will contain audited financials, gross margins, retention data, and compute cost structures that nobody outside Anthropic and its investors has ever seen publicly. When that lands, the conversation around AI valuations across the entire sector will shift. In one direction or another.

Worth watching closely.

For informational purposes only.