Anthropic's Seven Co-Founders: Who They Are and What They Do Now

Anthropic was founded in 2021 by seven people who had all worked at OpenAI: Dario Amodei, Daniela Amodei, Tom Brown, Jack Clark, Jared Kaplan, Sam McCandlish and Christopher Olah. As of November 12, 2026, all seven still hold senior roles at the company. Together they control 50.1% of the stockholder vote through a single Class F share held by their Founder LLC.

The details below come mainly from the amended S-1 Anthropic filed with the SEC on November 10, 2026, which gives each co-founder's title, background and share count. Anthropic has applied to list on Nasdaq, and MEXC's explainer on the ANT stock ticker covers the symbol itself.

Key Takeaways

• Anthropic has seven co-founders, all former OpenAI staff, and all seven still hold senior roles at the company.
• Together they owned 1,697,109,240 shares as of September 30, 2026, about 13% of the shares expected after the IPO.
• Each co-founder plans to sell 3,378,378 shares in the IPO, about 1.4% of each holding.
• Each has pledged 80% of their personal Anthropic equity to philanthropy.
• Their single Class F share, held through a Founder LLC, carries 50.1% of the stockholder vote.

Who Founded Anthropic?

Anthropic was founded by seven former OpenAI employees, and the filing says all seven remain active leaders. Two are executive officers and directors. The other five run research, compute, architecture and public benefit work.

• Dario Amodei: Chief Executive Officer and director
• Daniela Amodei: President and chairperson of the board
• Jared Kaplan: Chief Science Officer
• Christopher Olah: leads interpretability research
• Jack Clark: leads the Anthropic Institute
• Tom Brown: Chief Compute Officer
• Sam McCandlish: Chief Architect

The stakes are close to equal. Each co-founder beneficially owned between 240.6 million and 244.2 million shares as of September 30, 2026, for a combined 1,697,109,240 shares.

Who Is Dario Amodei?

Dario Amodei is Anthropic's Chief Executive Officer, a co-founder and a director. He is 43. He was VP of Research at OpenAI from July 2016 to December 2020, and a Senior Research Scientist at Google Brain before that. He holds a Ph.D. in biophysics from Princeton and a B.S. in physics from Stanford, and completed a postdoctoral fellowship at Stanford University School of Medicine. He beneficially owns 240,637,980 shares. Outside the company, he is known for long public essays on where AI is heading.

Who Is Daniela Amodei?

Daniela Amodei is Anthropic's President, a co-founder and the chairperson of its board. She is 39 and is Dario Amodei's sister. At OpenAI, from October 2018 to December 2020, her roles included VP of Safety and Policy, VP of People, and Engineering Manager. Before that she was a Risk Manager at Stripe from May 2013 to July 2018. She holds a B.A. in English Literature from UC Santa Cruz and beneficially owns 241,408,940 shares.

Who Is Jared Kaplan?

Jared Kaplan is Anthropic's Chief Science Officer and one of its seven co-founders. He is a physicist by training, with a Ph.D. in physics from Harvard and a bachelor's degree in physics and mathematics from Stanford. Before Anthropic he was a researcher at OpenAI and an associate professor of physics at Johns Hopkins University.

Kaplan is the first-listed author of Scaling Laws for Neural Language Models, a January 2020 paper on how language models improve as their size, training data and computing power grow. Three other future Anthropic co-founders are on the author list: Sam McCandlish, Tom Brown and Dario Amodei.

That idea still runs through the company. The prospectus has a section titled Scaling Laws and the Predictability of Progress, language that echoes the research Kaplan published.

Jared Kaplan beneficially owns 242,351,170 Anthropic shares.

Who Is Christopher Olah?

Christopher Olah is the Anthropic co-founder who leads the company's interpretability research. Before Anthropic he led interpretability research at OpenAI, and before that he was a research scientist at Google Brain.

Interpretability is the study of what happens inside a neural network. Researchers in the field try to work out which internal parts of a model respond to which ideas, and why the model gives the answer it does. The aim is to make AI systems easier to inspect before they are trusted with more.

Olah also edited a research journal. Distill, an online machine learning journal that ran from 2016 to 2021, lists him as one of its two editors.

His field sits close to Anthropic's safety pitch. In a January 2026 essay on AI risk, Dario Amodei named interpretability research among the ways to reduce the danger of AI systems acting on their own.

Christopher Olah beneficially owns 242,882,420 Anthropic shares.

Who Is Jack Clark?

Jack Clark is the Anthropic co-founder who leads the Anthropic Institute. Before Anthropic he was Policy Director at OpenAI, and before that he worked as a technology journalist. He is the only one of the seven whom the filing describes as a former journalist.

The institute is new. Anthropic announced it on March 11, 2026 as an effort to study the challenges powerful AI will pose to society, and said Clark would lead it in a new role as Head of Public Benefit.

Clark also writes Import AI. The newsletter's about page describes it as a weekly publication on AI built on close reading of new research, and notes that he once covered neural networks as a reporter at Bloomberg.

He has a governance role as well. Clark, Dario Amodei and Daniela Amodei are the initial managers of the Anthropic Public Benefit Fund, a subsidiary that holds 846,840,960 non-voting shares.

Jack Clark beneficially owns 242,271,840 Anthropic shares.

Who Is Tom Brown?

Tom Brown is Anthropic's Chief Compute Officer and one of its seven co-founders. At OpenAI he led the engineering of GPT-3, the language model the lab released in 2020. He holds an M.Eng. in computer science from MIT.

Brown is the first-listed author of Language Models are Few-Shot Learners, the May 2020 paper that introduced GPT-3. Its author list also includes Jared Kaplan, Jack Clark, Sam McCandlish and Dario Amodei, so five of Anthropic's seven co-founders share a credit on it.

His title reflects how much of an AI company's work is about computing power. The prospectus lists Anthropic's approach to compute as one of its core advantages, and Brown is the co-founder responsible for it.

Tom Brown beneficially owns 244,173,040 Anthropic shares, the most of the seven.

Who Is Sam McCandlish?

Sam McCandlish is Anthropic's Chief Architect and one of its seven co-founders. Before Anthropic he worked on AI safety research at OpenAI. He holds a Ph.D. in physics from Stanford and a bachelor's degree in mathematics and physics from Brandeis.

McCandlish followed the same route as Jared Kaplan: physics first, then OpenAI, then Anthropic. He is the second-listed author of the 2020 scaling laws paper, right after Kaplan, and a co-author of the GPT-3 paper.

The filing sums up his current job in a single title, Chief Architect, and gives no further detail on the role.

Sam McCandlish beneficially owns 243,383,850 Anthropic shares, the second-largest holding among the co-founders.

Why Did They Leave OpenAI to Start Anthropic?

The filing gives the short version of why the seven co-founders left OpenAI. It says Anthropic was formed in 2021 by researchers who had contributed to major advances in AI, and who believed a technology this powerful calls for a high degree of responsibility.

Dario Amodei has added detail in interviews. He spoke about it in a Fortune interview at the Brainstorm Tech conference in July 2023. A group inside OpenAI, he said, shared two beliefs. One was that models keep getting better as more computing power is added. The other was that making them safe takes separate work on top of that. He said the group trusted each other and wanted to work together.

He returned to the subject in late 2024. In a podcast interview reported by Inc. on November 13, 2024, he said arguing for his own vision inside someone else's company was not worth it, and he called the claim that the group left over OpenAI's deal with Microsoft false.

These are one founder's accounts, and the other six have said less in public. How the two companies now compare as IPO candidates is covered in MEXC's guide to the Anthropic and OpenAI IPO plans.

How Much Control Do the Co-Founders Keep After the IPO?

The co-founders keep majority voting control after the IPO. Their Founder LLC holds the single share of Class F stock, which carries 50.1% of the vote on matters put to stockholders in general. That share has no economic rights, so it is about control and not about money.

Readers who know crypto can think of a governance token, which gives its holder a vote without being the main economic asset. The difference is scale: this one share outvotes all Class A shares combined.

Anthropic will have four classes of stock that matter here:

• Class F: one share, held by the Founder LLC, with 50.1% of the general vote
• Class A: the shares sold in the IPO, one vote each, at most 49.9% of the vote in total
• Class T: held by the Long-Term Benefit Trust, which elects a majority of the board
• Class N: non-voting shares, the class that holds the Amazon and Google stakes

The trust is separate from the founders. The filing describes it as an independent body of five financially disinterested trustees. It chooses most of the directors but does not make day-to-day decisions.

Anthropic is also a public benefit corporation, so its directors must weigh the public benefit in its charter next to stockholders' financial interests. MEXC's walkthrough of what the Anthropic IPO prospectus reveals goes through the share classes in more detail.

What Happens to the Founders' Shares in the IPO?

Each of the seven co-founders is selling 3,378,378 shares in the IPO, about 1.4% of what each one holds. Together that is 23,648,646 shares, which is every share being sold by existing stockholders. The rest of the 825,000,000-share offering comes from the company.

The shares are offered at $70 to $78 each, a range explained in MEXC's guide to the Anthropic IPO price per share. At the $74 midpoint, each founder's sale would be worth about $250 million.

Based on 13,086,672,593 shares outstanding after the offering, the range would give Anthropic a market cap of about $916.1 billion to $1.02 trillion.

The shares they keep are locked up. The co-founders' lock-up period runs for up to 365 days after the prospectus date, and the filing describes a partial early release of up to 29% of each founder's locked shares from about the 180-day mark.

The longer-term plan is to give most of it away. The filing says each co-founder has pledged 80% of their personal Anthropic equity to philanthropic causes.

Founder stakes are one part of the ownership picture. MEXC's guide to Anthropic's valuation and who owns what covers the large outside holders.

The pricing date and first trading day have not been announced, and media reports pointing to the week of November 16 are unconfirmed. MEXC's page on the Anthropic IPO date and status tracks what is official. New filings are logged in MEXC's Anthropic IPO news tracker.

Follow the Anthropic Pre-IPO Countdown on MEXC

MEXC View: What Stands Out About Anthropic's Founder Group?

Our view is that three facts in the filing set Anthropic's founders apart.

First, the team is intact. All seven co-founders still hold senior roles almost six years after starting the company, and the filing states it directly.

Second, no one founder dominates. Their stakes sit within about 1.5% of each other, and control runs through one shared Class F share instead of any individual's holding.

Third, they are not using the IPO to cash out. Each is selling about 1.4% of his or her shares and has pledged 80% of the rest to philanthropy.

The trade-off is real, and we think readers should see it plainly. A group holding 50.1% of the vote can protect a long-term mission. It also means Class A holders cannot outvote the founders on general matters.

The date we would mark is the partial lock-up release around day 180, the first point at which more founder shares could be sold. None of this is a view on the stock's price.

Frequently Asked Questions About Anthropic's Co-Founders

Who is the CEO of Anthropic?

Dario Amodei is Anthropic's Chief Executive Officer and has held the role since the company was co-founded in January 2021.

Are Dario and Daniela Amodei related?

Yes, Dario and Daniela Amodei are brother and sister, and they serve as Anthropic's CEO and President.

Did all of Anthropic's founders work at OpenAI?

Yes, all seven co-founders worked at OpenAI before starting Anthropic in 2021.

Which co-founder owns the most Anthropic shares?

Tom Brown holds the most with 244,173,040 shares, though all seven holdings fall within about 1.5% of each other.

What is Jack Clark's Import AI?

Import AI is a weekly newsletter about artificial intelligence research that Jack Clark writes.

Conclusion

Anthropic's seven co-founders left the same employer, started one company and, nearly six years later, still run it together. The filing shows equal-sized stakes, a shared 50.1% vote and a shared pledge to give most of the equity away. The final prospectus at pricing will confirm the share counts.

More Anthropic Guides

• When Is the Anthropic IPO? Anthropic IPO Date, Plans and Status for 2026
• Is Anthropic Stock Public Yet? Does Anthropic Have a Stock, Ticker ANT and How to Buy
• Where Is Anthropic's S-1? Inside the Anthropic IPO Filing and Its November 2026 Amendment
• Anthropic IPO Prospectus Explained: What the S-1 Reveals About Revenue, Losses, Control and Risks
• Anthropic IPO News 2026: Latest on the S-1 Amendment, Ticker ANT and Listing Date
• Anthropic Q3 2026 Results: $16.96 Billion in Revenue, a $567 Million Operating Loss, and What It Means for the IPO
• Is Anthropic Profitable? Annual Revenue, Q3 2026 Losses and Cash Burn Explained
• Anthropic IPO Valuation: From $965 Billion to a Reported $1.5 Trillion, Every Round and Who Owns What
• Can You Buy Anthropic Stock Before the IPO? Three Routes Compared
• Can You Get Anthropic Shares at the IPO Price? How to Buy the Anthropic IPO From Anywhere
• When Will Anthropic List? What the Polymarket Anthropic IPO Odds Say Now
• Anthropic vs OpenAI IPO: Anthropic Lists First — What's Confirmed and What's Still Rumor
• Can You Still Get In Early? SpaceX, OpenAI, Anthropic and Databricks IPO Plans 2026
• ANT Stock: Anthropic's Ticker, IPO Date and How to Buy It (Not Ant Group)
• Anthropic IPO Price Per Share: How to Estimate It Before the Price Range Is Set
• What Is Anthropic Tokenized Stock? How It Works Before and After the ANT IPO
• Can You Short Anthropic Stock? How Shorting ANT Works Before and After the IPO
• Anthropic IPO Roadshow: When It Starts, Who Runs It and What Happens Next
• Will Anthropic Join the Nasdaq-100 or the S&P 500? How Index Inclusion Works for ANT

Disclaimer: This article is for informational purposes only and does not constitute investment, legal or tax advice. IPO timing, pricing and allocations can change. Share counts are from Anthropic's SEC filings and may change at pricing.

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