Anthropic Files Confidential S-1 for 2026 IPO

Anthropic confidentially filed its S-1 on June 1, targeting an October debut after closing a $65 billion Series H at a $965 billion post-money valuation days earlier.

Anthropic submitted a draft Form S-1 to the SEC on June 1, 2026, fewer than seven days after closing its $65 billion Series H round.
The $965 billion post-money valuation surpasses OpenAI's $852 billion mark; Anthropic targets a $1.75–1.8 trillion public listing price.
The company projects Q2 2026 revenue of $10.9 billion and a 2028 breakeven, two years ahead of OpenAI's 2030 target.

Lead

San Francisco — Anthropic confidentially submitted a draft registration statement on Form S-1 to the U.S. Securities and Exchange Commission on June 1, 2026, fewer than seven days after closing a $65 billion Series H that valued the AI safety company at $965 billion post-money. The filing opens the formal path toward a public listing the company is targeting as early as October 2026, at a valuation of $1.75 to $1.8 trillion — positioning what could become the largest technology initial public offering in history.

What Happened

Anthropic published the submission notice under Rule 135 of the Securities Act of 1933. The number of shares to be offered and the price range remain undetermined; final terms are subject to SEC review and market conditions.

The Series H, which closed May 28, was led by Altimeter Capital, Dragoneer Investment Group, Greenoaks Capital, and Sequoia Capital. Co-investors included Capital Group, Coatue Management, D1 Capital Partners, Singapore's GIC, ICONIQ Growth, Blackstone, Fidelity Management & Research, Baillie Gifford, T. Rowe Price, Temasek, DST Global, General Catalyst, and Lightspeed Venture Partners. Amazon, Anthropic's largest strategic partner, contributed $5 billion to the round, bringing its cumulative commitment to $8 billion since 2023.

Anthropic has retained Wilson Sonsini — the law firm that advised Google on its landmark 2004 IPO — to lead public-market readiness work. Goldman Sachs, JPMorgan Chase, and Morgan Stanley are under consideration for lead underwriting roles.

Financial Performance

Anthropic's annualized revenue run rate crossed $47 billion in May 2026. The company reported $4.8 billion in first-quarter revenue and projects $10.9 billion for the second quarter — more than a doubling quarter-over-quarter — driven by enterprise adoption of its Claude model family across healthcare, legal, financial services, and software development sectors.

Second-quarter operating profit is projected at approximately $559 million, a roughly 5% margin. The figure reflects continued heavy investment in compute infrastructure but signals meaningful operating leverage as gross margins trend toward 77% by 2028 — up from roughly 50% in 2025. Anthropic projects reaching breakeven in 2028, two years ahead of rival OpenAI's 2030 target, a distinction it is expected to emphasize prominently in the prospectus.

The OpenAI IPO Race

The Anthropic IPO filing places the company ahead of OpenAI in the race to become the first publicly traded frontier AI laboratory. The OpenAI IPO — widely anticipated for 2027 — has not yet reached the confidential filing stage with the SEC. OpenAI's most recent private-market valuation stands at approximately $852 billion, below Anthropic's $965 billion post-Series H mark.

Together with SpaceX, the three companies represent an estimated $3 trillion in enterprise value preparing to enter public markets in close sequence — an unprecedented concentration of late-stage private technology capital seeking liquidity. Institutional investors who have been unable to access AI's growth through listed equities are expected to drive significant demand for any Anthropic offering.

Strategic Context

Anthropic's "Constitutional AI" methodology and safety-first positioning are expected to anchor the IPO narrative, differentiating the company from peers at a time of intensifying regulatory attention on large language models in both Washington and Brussels. The company has expanded its San Francisco footprint to more than 900,000 square feet and is slated to move into a new 25-story headquarters at 300 Howard Street in 2027.

The current administration's deregulatory approach toward artificial intelligence has reduced near-term compliance uncertainty and improved the backdrop for technology listings broadly. The SEC review period typically runs 30 to 60 days, placing a potential public S-1 filing in late summer ahead of any October roadshow.

Outlook

Anthropic's confidential S-1 submission marks the moment frontier AI development begins its formal transition from private laboratory to public company. The $965 billion Series H valuation establishes a floor for institutional pricing expectations; how underwriters translate that private-market figure into a public multiple will set a benchmark for the entire sector. Any premium or discount at the Anthropic IPO opening will directly shape investor appetite for an eventual OpenAI IPO — and define the terms on which the AI industry meets public-market accountability for years to come.

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