Anthropic’s IPO Could Be the Biggest EVER… Here’s What You NEED to Know

Hey, Ross here:

Anthropic's IPO is shaping up to be the biggest the stock market has ever seen, and the $42 billion loss number everyone is fixating on is almost meaningless.

On September 28, Reuters obtained the secret Anthropic IPO filing. Within hours, that $42 billion figure was everywhere. The company behind Claude AI lost that much last year on just $4.6 billion in revenue.

But the headline number hides a far more important story, and you should see the rest of it before deciding whether to buy this IPO on day one.

On October 14, Anthropic is set to meet with investors to start building the case for an IPO that could value the company at $2 trillion. That would make it the largest IPO in history.

So if you're thinking about buying shares here, or you already own AI stocks and want to know how this affects the sector, there are a few numbers the viral headlines left out.

Anthropic IPO: Is the Company Going Public?

The filing is real. The prospectus isn't out yet.

Yes. Reuters obtained Anthropic's IPO filing on September 28, and the company is scheduled to meet with investors on October 14 to start pitching a public offering that could value it at $2 trillion.

That target would make this the largest IPO in history. But before a single share trades publicly, Anthropic still has to publish a full prospectus with verified financial figures. Most of what's circulating right now is data shared privately with investors, not an official public filing.

What Does Anthropic's $42 Billion Loss Really Mean?

The $42 billion loss is real. It's also the least important figure in the entire filing. About $34 billion of it is not cash Anthropic spent. It's an accounting charge tied to how the company financed past funding rounds.

The mechanics are simple. When Anthropic raised money in earlier rounds, some of that capital came in as financing that could later convert into equity shares. Then the valuation exploded, from $61.5 billion at the start of 2025 to $965 billion by May, and it's now tracking toward $2 trillion by year end. As the valuation climbed, the shares owed to those early investors became far more valuable, and accounting rules force Anthropic to record that increase as a loss on paper.

Think of it like lending money to a friend. Instead of cash, he promises to repay you in shares of his business. The business takes off, and your note is suddenly worth a fortune. On his books, that shows up as a loss, even though not a single dollar left his account.

The more successful Anthropic became, the bigger this "loss" grew. It's a strange side effect of winning, not a sign of trouble.

Strip the $34 billion out and there's still a real number underneath. Anthropic spent $12.65 billion to generate $4.6 billion in revenue last year. That's roughly $8 billion in actual operating losses. Of that spending, $7.33 billion went to computing power alone, the chips running in the data centers where Claude works. That single bill was about one and a half times larger than the company's entire revenue for the year.

On the surface, that looks like a company burning cash with no end in sight. That picture is already a year out of date.

The Number the Viral Posts Missed

The figures everyone is quoting end on December 31. The business has changed dramatically since then. In the first three months of this year, Anthropic earned $4.73 billion, more than it made in all of 2025, in a single quarter.

From April through June, revenue topped $11.5 billion, according to figures Anthropic shared with investors and reported by Bloomberg and the Financial Times. That same quarter a year earlier, revenue was just $787 million. A 14-fold increase in twelve months. And the company turned a profit that quarter too, roughly $559 million. Not massive, but real.

What changed? Companies started paying for AI that does real work: writing code, completing tasks, replacing things humans used to do manually. By April, more than 1,000 customers were each spending over $1 million a year with Anthropic. By the end of July, the annualized revenue run rate hit $65 billion.

A $42 billion loss paired with a $2 trillion ask sounds insane until you realize most of that loss is a paper charge, and sales grew from under $1 billion a quarter to $11.5 billion a quarter in a single year.

That's the context the viral headlines skipped.

What Is the $518 Billion Bill Underneath the Anthropic IPO?

The number that actually worries me isn't $42 billion. It's $518 billion, the amount Anthropic has committed to spending on cloud computing and infrastructure in the coming years.

That's not income. That's their bill.

These numbers start losing their meaning, so here's a frame of reference. $518 billion is enough to hand $1,500 to every man, woman, and child in the United States. A family of four walks away with $6,000. Out of one company's account.

Based on reports, roughly $200 billion of that total falls on Google and Broadcom over five years, and more than $100 billion falls on Amazon over ten years. Two caveats come attached:

• Two customers account for about a quarter of all 2025 sales. That's a concentrated revenue base.
• Many of Anthropic's largest customers aren't tied to long-term contracts. They can cut spending or leave.

So the bills are fixed for years. A meaningful chunk of the income backing those bills is not.

If demand keeps growing the way it did this past year, $518 billion in computing power is exactly how you sustain it. If demand stops, that's half a trillion dollars in commitments with nothing to cover them. Anthropic has told investors directly that it may not remain profitable as costs keep rising.

There's also a feedback loop worth watching. Every dollar of that $518 billion is someone else's income. Google and Amazon are cashing those checks, and both are also investors in Anthropic. Company A invests in Company B, and Company B spends that money buying from Company A. That's the cyclical dynamic everyone in this sector keeps pointing to, and Anthropic's contracts are a textbook example.

Let's Talk About Price

Anthropic's valuation path has been steep and fast: $61.5 billion at the start of 2025, $965 billion by May, and now a $2 trillion IPO target by year end. The same funding rounds that drove that climb are what created the convertible-share accounting charge baked into the $42 billion loss.

Here's the math on the target. At a $65 billion annualized run rate, a $2 trillion valuation means you're paying about 30 times this year's sales. Bankers justify that multiple with Anthropic's own forecast of $190 to $200 billion in revenue by 2028. Maybe they get there. At the rate this company has grown, I wouldn't bet against it.

But we've already watched this movie play out once this year.

Is It a Good Time to Go Public?

The hottest IPO of the year does not have to be bought on day one. SpaceX already proved that. SpaceX went public in June at a $1.77 trillion valuation, briefly crossed the $2 trillion mark, and then the shares fell by half.

Comparing the two gets complicated fast. Based on today's sales, Anthropic is actually cheaper than SpaceX was. Based on last year's figures, it's four times more expensive. That's why real value here is so hard to pin down. Growth rates in this sector are so enormous that the slightest error in projecting forward swings the estimate by hundreds of billions of dollars. In the early stages, it all comes down to supply, demand, and how good the story is.

A Direct Update on My SpaceX Call

I covered SpaceX in detail in May and June. I said the stock was oversubscribed, that it would likely hit $200, and that a significant correction would follow. That happened. The price dropped to almost $100. I then called fair value around $60 a share, and that was my buy point.

So far I've been completely wrong. It didn't happen. Despite a wave of share unlocks already hitting the market, the price hasn't collapsed. The big unlock is still ahead in November, and two more came in October, so there's still a meaningful amount of stock that could reach the market in the final quarter of this year.

So yes, sometimes I'm wrong. Tell me "I told you so," that's fine. I still think the stock is a bit overvalued at current levels and I still expect it to fall lower. But I wanted to state that plainly rather than pretend the call played out perfectly.

What Is the One Thing to Watch Before the Anthropic IPO?

Before Anthropic sells a single share to the public, it has to publish its prospectus. That document needs verified figures for this year, not the private data circulating among investors. You can track official filings directly through the SEC's EDGAR database.

Here's the test I'm running the moment it drops:

• If revenue keeps growing past $11.5 billion per quarter and Anthropic has held onto a profit despite rising costs, the $42 billion headline was noise and this is real growth.
• If sales have stalled, or profits have turned back into large losses, then $2 trillion is an inflated price for a company whose growth is already slowing.

That single document will tell you more than any headline number has so far.

Final Thoughts on the Anthropic IPO

Right now the internet is arguing about a company that lost $42 billion. That argument won't last long.

The real story is a company whose sales grew 14-fold in a year, on pace to a $65 billion run rate, with $518 billion in infrastructure commitments riding on whether that growth continues.

The $42 billion loss is mostly paper. The $518 billion bill is not. That's the number that decides whether this IPO is a generational opportunity or an overpriced bet on growth that has to keep accelerating just to cover the tab already signed.

This will be the largest and most closely watched IPO in stock market history. Whether the Anthropic IPO is worth buying on day one depends entirely on what shows up in that prospectus, and I'll be reading it line by line.