Anthropic IPO Prospectus Reveals 1088% Revenue Surge and $42 Billion Net Loss in 2025

Anthropic has filed for an initial public offering, with its prospectus leaked to Reuters revealing dramatic growth alongside staggering costs. The Claude maker generated $4.59 billion in revenue for fiscal year 2025, up 1,088% from $386 million a year earlier, while its operating loss widened to $8.06 billion from $2.98 billion in 2024.

The headline GAAP net loss of $41.97 billion, compared with $8.31 billion in 2024, requires context: roughly $34 billion of that figure stems from an accounting charge tied to the rising value of financing instruments that could convert into Anthropic shares, rather than cash burned running the business. Even so, the underlying operating losses remain substantial.

Compute and infrastructure spending reached $7.33 billion in 2025, up 190% year over year and nearly three times the prior year's level, representing 58% of the company's total operating expenses of $12.65 billion and roughly 1.6 times its entire annual revenue. The prospectus outlines approximately $518 billion in forward cloud, compute and infrastructure obligations, signaling that costs are expected to keep climbing. Anthropic ended 2025 with $20.28 billion in cash, equivalents and short-term investments.

Customer concentration is a notable risk: its two largest direct customers each accounted for 12% of revenue, meaning just two buyers represented 24% of total 2025 sales, and the filing warns that many of its largest clients are not locked into long-term contracts. Amazon and Google are both major strategic investors and primary cloud infrastructure suppliers. The IPO could value Anthropic above $2 trillion and is expected to be timed after the November U.S. midterm elections, which would give public-market investors one of their first pure-play opportunities to price a frontier AI laboratory.