Anthropic Confidentially Files for Initial Public Offering Anthropic’s quiet step toward the stock market has ignited a very public race among AI giants and a high‑stakes test of investor appetite for trillion‑dollar tech.

On June 1, Anthropic disclosed that it had confidentially submitted a draft S-1 registration statement to the U.S. Securities and Exchange Commission, giving the company “the option to go public after the SEC completes its review.” The AI lab stressed that the number of shares and price “have not yet been set” and framed the notice as a technical Rule 135 announcement rather than a sales pitch.

The filing capped a frenzied funding period. Less than a week earlier, Anthropic closed a $65 billion Series H round at a $965 billion valuation, the largest venture-style raise on record, leapfrogging OpenAI and setting up a potential IPO valuation above $1 trillion. Tech media quickly cast the move as the latest volley in a three‑way race with OpenAI and SpaceX to reach the public markets at or above the trillion‑dollar mark.

Coverage across outlets underscored both the scale and secrecy of the listing. TechCrunch noted that Anthropic “filed confidentially for an initial public offering,” allowing it to prepare away from “the critical eye of the public” until a full S‑1 is published. The Verge highlighted that the Claude maker is now being “called the world’s most valuable startup” at $965 billion, edging past OpenAI’s $852 billion valuation. Business Insider framed the S‑1 as a major step in a “race to IPO” that could see both Anthropic and OpenAI debut with valuations north of $1 trillion.

Wall Street and strategic investors are already tallying gains. Salesforce’s early bets, totaling around $50 million since 2023, have swelled into a roughly $5 billion stake—about two‑thirds of its entire strategic portfolio—after Anthropic’s latest round. Analysts see the IPO as a referendum on how markets value enterprise AI: EMARKETER’s Nate Elliott argues that while Claude lags in consumer adoption, it is “poised to win enterprise AI,” and that “how the markets value that will make or break Anthropic’s IPO.”

Industry rivals are watching closely but downplaying the stock‑market drama. OpenAI CEO Sam Altman called listing “a financing event,” insisting the real contest is “to deliver the best technology, build the best business,” and predicting the world will demand “multiple providers” of such critical infrastructure.

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