Anthropic's IPO filing reveals explosive growth, massive losses, and key risks

Anthropic filed to go public on the US stock market, revealing explosive revenue growth alongside massive losses and extensive business risks in its first audited financial disclosure. The S-1 filing, released Monday, details the AI lab's financials and over 90 pages of potential threats. The company reported $16.3 billion in revenue and an $80 billion loss in the first half of 2026, largely due to a $72.4 billion one-off charge. Computing costs dominate expenses, with nearly $9 billion spent on AI infrastructure in that period. Top five customers account for 25% of business, creating concentration risk. Anthropic acknowledges its AI safeguards are incomplete, noting models could assist malicious actors in developing dangerous weapons. The filing also cites risks from regulatory changes, data center moratoriums, immigration policies, and potential liability from AI-related catastrophic events.