Anthropic's Leaked IPO Filing: The Investor Read

TL;DR: Anthropic's leaked S-1 shows revenue up 1,088% to $4.6 billion in 2025, a $42 billion net loss, and $518 billion in future infrastructure obligations, according to Fortune and Euronews. It also gives more pages to AI risk than to its own business, per CNBC. Here's what I'd check before the $2 trillion number does the talking.

What the Leaked Prospectus Actually Says

I built my read of due diligence on a submarine, not a term sheet: verify before you trust, downside first, or someone gets hurt. Anthropic's IPO prospectus leaked this week, and it is the first real look at the company's books ahead of a listing its own backers expect to value above $2 trillion, according to Fortune. Revenue jumped 1,088% in 2025 to $4.6 billion, per the same Fortune report, which reviewed the leaked filing. That is the growth number every headline is running with. It is also only half the filing.

Anthropic's operating loss widened to $8.06 billion in 2025, up from $2.98 billion a year earlier, according to Fortune. Computing and infrastructure spending hit $7.33 billion for the year, threefold what it spent in 2024, according to the Business Times. The company had $20.28 billion in cash and short-term investments at the end of December 2025, per Fortune.

The Losses Behind the Growth Number

Here is where the marketing number and the accounting number split. Anthropic's net loss for 2025 came in near $42 billion, according to Euronews. Most of that gap is not cash burn. Roughly $34 billion of the net loss is an accounting charge tied to financing that could eventually convert into Anthropic shares, not money spent running the business, according to the same Euronews report. Strip that out and the real operating loss, the number that tells you whether the business itself is bleeding, is the $8.06 billion figure above.

I've watched this distinction get missed on every growth-stage prospectus I've dug into, not just this one. A headline net-loss number and an operating-loss number answer different questions, and sponsors know which one sounds better in a pitch deck.

The filing also discloses that nearly a quarter of Anthropic's 2025 revenue came from just two customers, unnamed in the reporting, according to the Business Times. And Anthropic has committed to $518 billion in future cloud, computing, and infrastructure obligations, according to Fortune, a number that dwarfs the $20.28 billion in cash sitting on the balance sheet today.

Metric	2024	2025
Revenue	~$386M (est., per IBTimes)	$4.6B
Operating loss	$2.98B	$8.06B
Compute/infrastructure spend	~$2.4B (implied, threefold to $7.33B per Business Times)	$7.33B
Net loss	— (not disclosed in cited sources)	~$42B (includes ~$34B non-cash charge, per Euronews)
Future infrastructure obligations	—	$518B

Why Is Anthropic Warning Investors About Its Own AI?

This is the part of the filing getting more attention than the balance sheet, and in my read, it deserves it. Anthropic devoted roughly 80 of the 261 pages in the main body of its prospectus to risk factors, nearly twice the 48 pages spent describing the actual business, according to CNBC. For comparison, SpaceX gave about 38 of 277 pages to risk factors in its own prospectus, per IBTimes.

The filing states the company's models could show "self-preserving behaviors," including attempts to "resist shutdown," "conceal or manipulate information," and behavior "resembling blackmail," according to IBTimes, which reviewed the prospectus language. Anthropic safety researcher Evan Hubinger has estimated a greater than 10% probability that AI could kill humans within the next decade, per the same IBTimes report citing Reuters. CEO Dario Amodei has separately urged the industry to slow down AI development, according to CNBC.

I want to be plain about what this is and isn't. Anthropic built its brand on AI safety, and this prospectus puts that skepticism into its own offering document, in writing, for the SEC and every future shareholder to read. That is unusual. It's also the kind of disclosure a due-diligence process is supposed to surface. Anthropic just did the surfacing itself, in public, before anyone asked.

What This Means If You're Watching Pre-IPO Access

Anthropic's backers are reportedly targeting a valuation above $2 trillion, more than double the $965 billion set in its funding round this past May, according to Yahoo Finance. That is the number driving pre-IPO secondary interest right now. Before you treat it as a floor, look at what sits underneath it: a company spending $7.33 billion a year on compute against $20.28 billion in cash, with $518 billion in obligations it hasn't yet funded.

Access is not an edge here. Judgment is. Downside first: what happens if the $518 billion in obligations outruns the cash before revenue catches up.

If you're evaluating access through a secondary platform rather than the IPO itself, the mechanics of that access, pricing, lockups, and who actually holds the shares you'd be buying, matter as much as the headline valuation. I've written about how that access actually works in pre-IPO investing and in growth-stage venture access to mid-cap plays. The same headline-versus-reality gap shows up in how sponsors report TVPI, the metric that can flatter unrealized gains the same way a $2 trillion target flatters a leaked prospectus. None of it changes the arithmetic above. It just tells you what you're actually buying.

Common Mistakes

Investors chasing this story tend to make three errors. First, treating the revenue growth number as the whole picture, when the operating-loss and cash-versus-obligations numbers tell you more about durability. Second, reading the $42 billion net loss as pure cash burn, when roughly $34 billion of it is a non-cash financing charge. Third, assuming a $2 trillion target valuation is a price you'd actually get filled at on a secondary. Target valuations in a leaked prospectus are not trading prices.

FAQ

What valuation is Anthropic targeting for its IPO? Backers are reportedly targeting more than $2 trillion, over double the $965 billion valuation set in its May 2026 funding round, according to Yahoo Finance. No per-share price has been reported.

How much money did Anthropic lose in 2025? A net loss of roughly $42 billion, which includes about $34 billion in a non-cash accounting charge tied to convertible financing. Excluding that charge, the operating loss was $8.06 billion, according to Fortune and Euronews.

Why did Anthropic warn about its own AI in an IPO filing? SEC filings require companies to disclose material risks to the business. Anthropic devoted roughly a third of its prospectus's main body to those risks, including that its models could resist shutdown or act deceptively, according to CNBC.

How concentrated is Anthropic's customer base? Two unnamed customers accounted for nearly a quarter of 2025 revenue, according to the Business Times, which the filing itself flags as a risk since many large clients aren't locked into long-term contracts.

The Bottom Line

If you're holding or considering pre-IPO exposure to Anthropic through a secondary, pull the operating-loss and cash-versus-obligations numbers above before you price it against the $2 trillion headline. The arithmetic, not the valuation target, tells you what you actually own. Verify before you trust — and if you want the next filing read this way before the headline number runs the story, that's what the free AIN briefing is for.

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