Anthropic Files Confidentially for IPO at $965 Billion Valuation

Anthropic Files Confidentially for IPO at $965 Billion Valuation

Anthropic, the artificial intelligence company behind the Claude chatbot, filed confidentially for an initial public offering on June 1, 2026, less than a week after raising $65 billion in funding that pushed its valuation to $965 billion. The San Francisco-based company submitted its paperwork to the Securities and Exchange Commission under the JOBS Act, which allows emerging growth companies to keep their IPO filings private until shortly before going public. The move positions Anthropic to become one of the most valuable technology companies ever to list on US markets.

The filing comes amid a wave of AI companies seeking public markets. SpaceX, Elon Musk's private rocket and AI company, is also preparing to go public. Several major stock market index providers have recently changed rules to allow unprofitable companies to be included in their indexes more quickly. This shift could mean that millions of Americans invested in retirement funds through index funds will soon own shares of SpaceX and potentially Anthropic, whether they actively choose to or not. The change has sparked debate about whether passive investors should be exposed to such volatile, unproven companies.

Anthropic's valuation has skyrocketed in recent months. The company was valued at $180 billion in early 2025, meaning its valuation has grown more than fivefold in just over a year. The $65 billion funding round was led by a consortium of sovereign wealth funds and venture capital firms, including existing investors Lightspeed Venture Partners and General Catalyst. Anthropic has positioned itself as a safety-focused alternative to OpenAI, emphasizing its "Constitutional AI" approach that aims to align AI systems with human values. Whether that positioning justifies a nearly trillion-dollar valuation remains a subject of intense debate.

Bernie Sanders Proposes 50% AI Wealth Tax

The IPO filing coincided with a provocative legislative proposal from Senator Bernie Sanders. On June 1, 2026, Sanders announced a bill that would impose a one-time, 50% tax on the stock of OpenAI, Anthropic, and other major AI companies. The proceeds would fund a sovereign wealth fund that gives the American public a direct ownership stake in AI technology. In a New York Times op-ed, Sanders argued that the fund would "give the public a direct role in determining the future of this technology and guarantee that the trillions of dollars potentially generated by AI are used to improve the lives of all of us."

The Sanders proposal has sent shockwaves through Silicon Valley. Venture capitalists and tech executives have condemned the bill as confiscatory and unconstitutional. According to Dr. Erik Brynjolfsson, a professor at Stanford University's Institute for Human-Centered AI, "A 50% wealth tax would destroy the incentive to build AI companies in the United States. Founders would simply move to jurisdictions with friendlier tax regimes." The bill faces virtually no chance of passing the current Republican-controlled Congress, but it has shifted the Overton window on AI policy debate.

Anthropic's IPO plans also face regulatory scrutiny. The company has been criticized for the safety of its Claude chatbot, particularly regarding its use by children. Florida became the first state to sue OpenAI and CEO Sam Altman on June 1, alleging that ChatGPT is not safe for minors. Florida Attorney General James Uthmeier stated, "We're here to announce that we recently filed a monumental civil lawsuit against Sam Altman and ChatGPT for endangering our kids and deceiving parents into believing that this application is safe for use." Anthropic could face similar litigation as a public company with deeper pockets.

Background & Context

Anthropic was founded in 2021 by siblings Dario and Daniela Amodi, who previously led research at OpenAI. The company has distinguished itself through its focus on AI safety and its refusal to release products without extensive testing. Claude, the company's flagship chatbot, was launched in 2023 and has gained a reputation for being more cautious and less prone to hallucination than competing products. According to a 2025 report from the AI Index at Stanford University, Anthropic publishes more safety research than any other major AI lab.

The AI IPO market is heating up. In 2025, only three AI companies went public, raising a combined $8 billion. In 2026, that figure could exceed $50 billion if Anthropic, SpaceX, and several smaller companies complete their planned listings. According to data from Renaissance Capital, the average first-day pop for AI IPOs in 2025 was 42%, compared to 18% for the broader tech sector. Investors are hungry for AI exposure, and Anthropic's listing will test whether that appetite extends to nearly trillion-dollar valuations.

Frequently Asked Questions

What happened?

Anthropic filed confidentially for an IPO on June 1, 2026, after a $65 billion funding round valued the company at $965 billion.

Why does this matter?

The IPO would be one of the largest in history and tests whether AI valuations are sustainable in public markets.

Who is affected?

Anthropic employees and investors, index fund holders who may own Anthropic shares passively, and rival AI companies watching the listing.

What happens next?

Anthropic will likely go public within 3–4 months, but Sanders' tax proposal and Florida's lawsuit against OpenAI create regulatory headwinds.