Anthropic's Founders Pledge 80% of Stakes — Near $80 Billion

Seven cofounders of Anthropic have pledged to give away 80% of their personal equity in the AI company — a commitment worth roughly $79.4 billion at the latest private funding-round price.

CEO Dario Amodei first laid out the pledge in a January essay warning about AI's risks, arguing that people who get rich from the technology bear responsibility for its economic consequences. Anthropic reaffirmed the commitment in its IPO filing, made public Monday morning, stating that its cofounders "have each pledged to dedicate 80% of their personal equity in Anthropic to philanthropic causes."

The seven founders — Dario Amodei, Daniela Amodei, Tom Brown, Jack Clark, Jared Kaplan, Sam McCandlish, and Chris Olah — collectively hold roughly 1.69 billion shares. A Fortune analysis of the share counts and the latest private funding-round price puts their combined holdings at approximately $99.3 billion. Eighty percent of that comes to about $79.4 billion, or roughly $11 billion per founder on average.

One catch: the S-1 leaves the offering price and the number of shares each founder will sell blank, so nobody can yet value what remains in their hands after the offering.

How big is the business behind the pledge?

Very big, and accelerating fast. Anthropic generated $16.3 billion in revenue in the first half of 2026, according to the S-1 — up from $1.2 billion in the same period a year earlier. That's a more than thirteenfold jump in twelve months.

The IPO itself could raise as much as $100 billion. Anthropic plans to trade on the Nasdaq under the ticker "ANT," with a debut expected around Thanksgiving that could value the company at $1.5 trillion to $2 trillion.

In plain words: the pledge's eventual size depends heavily on where that valuation lands.

Where would the money go?

The filing describes the pledges as voluntary and revocable — not legally binding — and leaves the timing and recipients of donations uncertain. The founders could fulfill their promises through charities, private foundations, donor-advised funds, or other philanthropic vehicles.

Giving away most of their stakes doesn't mean giving up control. Under the planned governance structure, the seven founders would collectively hold 50.1% of the voting power on matters put to shareholders generally, through a special share held by their Founder LLC.

The threshold for staying in that LLC is low: a cofounder keeps their seat as long as they retain at least 2% of the Class A shares they held at the IPO. In practice, a founder could give away 98% of their stake and still help decide how the controlling share votes. A separate Long-Term Benefit Trust, however, holds the authority to appoint a majority of the board.

The founders' personal promises sit apart from Anthropic's Public Benefit Fund, whose shares would be worth approximately $50 billion at the same private-funding benchmark. Anthropic says the fund could support nonprofits or distribute money directly to specific populations, including efforts to address AI's impact on workers.

For Amodei, the math points to a societal risk, not a tax problem. "The thing to worry about is a level of wealth concentration that will break society," he wrote in his January essay.

That line now sits at the center of the largest philanthropic pledge ever attached to a tech IPO filing — and the Thanksgiving debut will set the number the founders are actually promising away.