Anthropic Files for IPO After Surpassing OpenAI's $965B Valuation

The IPO Race Heats Up

Anthropic filed a confidential S-1 form with the US Securities and Exchange Commission on June 2, 2026, launching the formal process toward a public offering. According to The Register, this move positions Anthropic to become the first of the leading AI firms to pursue public markets at scale—a strategic maneuver timed to capitalize on its newly crowned status as the sector’s most valuable pre-IPO company.

The filing comes days after Anthropic announced the completion of a $65 billion Series H funding round on May 27, 2026, lifting its post-money valuation to $965 billion. According to The Register, this figure exceeds OpenAI’s most recently reported valuation of $852 billion—the previous record for any pre-IPO technology company. The company stated in its IPO announcement that “the proposed initial public offering will depend on market conditions and other factors,” adding that share count and pricing remain undetermined.

Valuation Momentum and Competitive Context

Anthropic’s path to the top has hinged on product differentiation and revenue concentration. The Register notes that Claude Code has enhanced the company’s reputation as a more pragmatic alternative to competitors’ offerings, and Anthropic reportedly generates higher revenue per user than OpenAI despite commanding a smaller customer base. This revenue density—rather than user scale—appears to have been a lever in the Series H fundraising round led by a consortium of institutional investors.

However, The Register also surfaces a critical caveat: valuation leadership does not guarantee financial stability. According to the Wall Street Journal, cited by The Register, Anthropic is approaching its first quarter of operating profit—a claim made by anonymous company sources. The publication notes that private companies face no mandatory disclosure standards, allowing valuations and profitability claims to rest on unverified foundations. The Register’s commentary suggests such figures warrant skepticism until the public S-1 filing reveals audited financials.

Why This Matters

The IPO race between Anthropic and OpenAI will test investor appetite for AI firms trading on growth and moat narratives rather than established profitability. If Anthropic’s public filing reveals financials comparable to historical precedent—such as SpaceX’s IPO prospectus, which showcased high valuations alongside substantial operating losses—the disclosure could deflate sentiment across the sector and reshape how institutional investors price AI startups. Teams evaluating vendor lock-in and financial stability will have their first credible window into the cash economics and path to positive unit economics at scale.