Anthropic co-founders set to become billionaires in upcoming IPO

Four researchers, a former journalist, a public policymaker, and an engineer founded Anthropic in 2021. Six years later, the artificial intelligence firm is preparing to go public, with trading expected to begin on Nov. 19. The upcoming initial public offering is projected to be one of the largest on record.

The seven co-founders collectively own about 10% of the company. Each holds roughly 240,000,000 class A shares, representing a 1.4% stake. Based on Anthropic’s most recent funding round, which valued shares at $58.90 each, those individual holdings were worth approximately $14 billion. If the public listing achieves its target price range of $70 to $78 per share, reaching a market valuation of nearly $1.4 trillion, individual stakes would rise to between $17 billion and $18 billion.

The split from OpenAI over safety

At the end of 2020, siblings Dario Amodei and Daniela Amodei held vice president roles at OpenAI. They grew concerned over the company’s approach to artificial intelligence safety, worried that model capabilities were advancing faster than human understanding of the technology. Fearing that OpenAI was prioritizing commercialization over safety, they left to launch Anthropic early in 2021.

Five OpenAI colleagues joined them to form the founding team: Tom Brown, Jack Clark, Jared Kaplan, Sam McCandlish, and Chris Olah. The team sought to build a company focused on responsible development rather than pure commercial expansion.

Backgrounds of the executive team

Chief Executive Officer Dario Amodei, who holds the largest share count at 245,259,100 shares including voting proxies, earned a doctorate in computational neuroscience from Princeton University in 2011. Before joining OpenAI in 2016, he conducted speech recognition research at Baidu and worked on neural networks at Google Brain. While at OpenAI, he co-invented reinforcement learning from human feedback, a method used to align AI responses with human safety requirements.

Daniela Amodei serves as president and board chair. After earning a degree in English literature and politics, she worked in congressional politics before managing risk at financial technology firm Stripe for five years.

Chief Compute Officer Tom Brown previously co-founded two startups, including MoPub, which was acquired by Twitter. At OpenAI, he led research engineering for the GPT-3 model, expanding parameter scale from 1.5 billion to 175 billion, and co-invented alignment techniques alongside Dario Amodei.

Jack Clark, who leads public benefit efforts and heads the Anthropic Institute think tank, was previously a technology journalist at Bloomberg before joining OpenAI in 2016. Chief Science Officer Jared Kaplan maintains a role as an associate professor of physics and astronomy at Johns Hopkins University after receiving a doctorate in physics from Harvard University.

Why it matters for builders and investors

The impending public listing demonstrates the immense commercial value created in the generative AI market over a short timeframe. For founders and technical talent, the event illustrates how safety-focused spin-offs can compete directly with dominant market pioneers while securing massive private and public valuations.

For investors, the listing will test public market appetite for frontier AI developers operating at valuations near $1.4 trillion. It also highlights potential governance dynamics, as early technical founders retain significant financial stakes and internal control while navigating the financial incentives of public equity markets.

What to watch next

Market observers will track whether Anthropic hits its target price range of $70 to $78 per share when public trading opens on Nov. 19. Post-listing performance will show how public investors weigh the company’s dual mission of commercial expansion and safety research against its massive equity valuation.