Anthropic founders could see wealth double in upcoming IPO

The scale of founder wealth

Anthropic recently filed its S-1 registration statement with the Securities and Exchange Commission to prepare for an initial public offering. The paperwork reveals that the company's seven co-founders hold almost identical stakes in the firm. Each founder owns about 240 million shares, which represents roughly 10% of the company's total ownership.

As reported by Fortune, these stakes are currently valued between $13.7 billion and $14.4 billion based on the company's most recent private funding round. If the company reaches the $2 trillion valuation estimated by Wall Street, those personal fortunes could jump to between $27 billion and $29 billion each. This wealth is concentrated among the original group that left OpenAI in early 2021 to start the venture.

The group includes high-level executives such as CEO Dario Amodei and President Daniela Amodei. Other key figures include chief science officer Jared Kaplan and chief architect Sam McCandlish. While the filing lists these individuals as selling stockholders, it does not yet specify exactly how many shares each person intends to sell during the offering.

How the ownership math works

The valuation of these shares is tied to a recent funding round where Anthropic issued 77.6 million units of Series H-1 preferred stock. These units were sold at a price that, after a 10-for-1 stock split in September, equates to $58.90 per common share. This price serves as the baseline for the current estimates of the founders' net worth.

To estimate the total number of shares, the filing notes that the company put 846.8 million shares into a new Public Benefit Fund. This amount is stated to equal 5% of the company's fully diluted shares, implying a total of about 16.9 billion shares. Based on this math, each co-founder owns approximately 1.4% of the company's total equity.

The filing does not yet include a final price range or a final share count for the IPO. These details will be updated in an amended filing before the company begins marketing the stock to the public. Until then, the current figures remain based on private funding data and external market predictions rather than confirmed public offering terms.

Philanthropy and voting power

Each of the seven co-founders has promised to donate 80% of their personal Anthropic equity to charitable causes. However, the filing clarifies that these promises are voluntary and revocable expressions of intent rather than legally binding obligations. The founders have not yet decided on the specific timing, amounts, or recipients for these donations.

The company uses a unique share structure to ensure the founders keep their influence even as they give away money. A single share of Class F stock, held by an LLC owned by the founders, carries 50.1% of the company's voting power but no economic rights. This means a founder could donate nearly all of their stake and still help decide how the company is run.

The filing acknowledges that this structure creates a potential conflict of interest. It notes that as founders donate stock, their personal economic interests will shrink while their voting control remains the same. This could cause their interests to diverge from those of other stockholders who do not have the same voting privileges.

Other major stakeholders

While the founders hold a significant portion of the company, other major players are involved in the ownership structure. Amazon and Google are expected to hold nonvoting Class N stock after the offering. Because these holdings are capped at 12% and 14.99% respectively, their specific share counts are not disclosed in the ownership table.

The Anthropic Public Benefit Fund is another massive holder, currently owning 846.8 million shares. At the current private price, this block is worth about $49.9 billion, which is more than three of the co-founders' stakes combined. One of the fund's first managers is expected to be co-founder Jack Clark.

In contrast, the executive team's direct pay remains relatively modest compared to their equity. For example, CEO Dario Amodei received $17.96 million in total compensation for 2025, which included a salary of $654,167. CFO Krishna Rao earned $720,250 last year, though he holds a stake worth about $559 million before exercise costs.

What comes next for the IPO

The next step for Anthropic is to finalize the details of its public listing. The company must provide a specific price range and the number of shares to be sold in the offering. These figures will be included in an amended S-1 filing before the company begins its official marketing efforts to investors.

The founders are currently subject to a standard 180-day lockup period, which prevents them from selling their shares immediately after the IPO. However, the lead underwriters, Goldman Sachs and Morgan Stanley, have the authority to waive this period early. The timing of any potential sales will depend on these negotiations and market conditions.

Investors will be watching to see if the final valuation matches the $2 trillion estimate reported in the press. Because the filing does not use that specific number, the actual price per share could vary significantly once the company provides its final calculations. The outcome will determine the final distribution of wealth and the level of influence the founders retain over the AI giant.