Each of Anthropic’s seven co-founders keeps a vote in the LLC that casts its fixed 50.1% of the stockholder vote as long as they hold at least 2% of the Class A shares they own when the IPO closes, its amended S-1 says. From the ownership table, that floor is about 4.7 million to 4.8 million shares each, 33.5 million in all, by our arithmetic. The other 98%, about 1.64 billion shares, is worth about $121.4 billion at the $74.00 midpoint of the price range.
If all seven sold down to the floor and the share count stayed the same, they would own 0.26% of Anthropic’s stock and still cast about 50.3% of the vote, by our arithmetic. At the IPO it is 12.8% of the stock and 61.3% of the vote, 4.8 points of vote per point of equity, as we reported.
Business Pill · Concentration Explained
A short explainer on concentration. It teaches the general idea only and does not discuss Anthropic or its co-founders.
The key insight: Each Anthropic co-founder keeps a vote in the LLC behind the fixed 50.1% while holding at least 2% of their IPO-day Class A stake, the S-1/A says: about 4.7 million to 4.8 million shares each, by our arithmetic. The other 98%, about $121.4 billion at the $74.00 midpoint, can be sold without touching the 50.1%.
The Class F share goes to an LLC whose seven initial members are the co-founders, and each member has one vote on how it is cast, the filing says. A member is removed on resignation, death or incapacity, removal for cause or an approved leave of absence. Each original co-founder is also removed on ceasing to hold Class A shares “equal to at least 2% of the shares of Class A common stock held by such original co-founder and their related holders as of the completion of this offering” on the record date of a stockholder vote.
Shares subject to options, RSUs and other convertible securities count toward the 2%, the filing says. The removal is not automatic: “Removals due to incapacity, cause, or the failure to maintain the minimum ownership threshold require prior written notice from the Founder LLC by action of a majority of the other Continuing Founders”.
The seven co-founders’ share of Anthropic’s stock and of the general stockholder vote after the IPO, and if each kept only the 2% floor with the share count unchanged. The 61.3% vote and share counts are from Anthropic’s S-1/A of 10 November 2026; the other figures are our arithmetic.
What 2% Is in Shares
After each sells 3,378,378 shares in the offering, the seven will hold between 237,259,602 and 240,794,662 Class A shares each, 1,673,460,594 in all, as we reported from the ownership table. Two percent is 4,745,192 shares for Dario Amodei, the smallest holding, up to 4,815,893 for Tom Brown, the largest, by our arithmetic: about $351 million to $356 million each at $74.00.
Above the floor sit about 232.5 million to 236.0 million shares each, or $17.2 billion to $17.5 billion at the midpoint, and about $121.4 billion for the seven, by our arithmetic. These are values at the midpoint, not trading prices. The co-founders’ shares are locked up for “up to 365 days after the date of this prospectus”, the filing says; our IPO calendar has the earlier release dates.
The Vote at the Floor
The voting power of the trust and the Founder LLC is “not derived from or proportionate to economic interests in our company”, the filing says. The Class F share carries 50.1% of the general vote and all Class A shares together carry 49.9%.
At the floor, the seven’s 33.5 million shares would be 0.45% of the 7,427,991,791 Class A shares, worth about 0.22% of the vote. Added to the Class F share, that is about 50.3% of the vote on 0.26% of the 13,086,672,591 Class A and Class N shares: about 197 points of vote per point of equity, by our arithmetic.
Inside the LLC a majority decides, four of seven by our arithmetic. If a majority of the Continuing Founders cannot agree, the Class F share is generally voted in proportion to the Class A votes cast, the filing says.
Top: the seven co-founders’ Class A shares after the IPO, split at the 2% floor; values at the $74.00 midpoint are our arithmetic. Bottom: the shortest path from the trigger to the redemption of the Class F share, 90 plus 450 days. Rules and share counts from Anthropic’s S-1/A of 10 November 2026.
What Ends the 50.1%
The Class F share is redeemed “for no consideration” when a 450-day transition period is completed, the filing says. That period starts after there have been fewer than three Continuing Founders for 90 consecutive calendar days. A supermajority of the Continuing Founders can also agree to redeem it, or the LLC can be dissolved.
From the trigger, the shortest path to the end of the 50.1% is 540 days, about 18 months, by our arithmetic, and five of the seven would have to leave first. A successor can take the place of a co-founder who dies or becomes incapacitated, and count toward the three, “until the tenth anniversary of the completion of this offering”, the filing says.
In our comparison of five founder-controlled listings, Snap’s Class C converted once a founder’s Class C fell below 30% of what he held at the IPO. Anthropic’s 2% floor is set per co-founder and governs a seat in the LLC rather than the votes of any share. How the directors must balance stockholders and the company’s purpose is in our explainer on the public benefit duty.
The Structural Read
As we read the removal list, the 2% floor ties each co-founder’s seat in the LLC to keeping a stake, but a small one, and the size of the vote does not move with it: the Class F share carries 50.1% whatever the seven hold.
As we read the sunset table, the 50.1% ends through who remains in the LLC, not through how many shares the group sells: the trigger is fewer than three Continuing Founders for 90 days, then 450 more days.
Anthropic S-1/A, 10 Nov 2026
“The Class F Sunset Time, once triggered, is not subject to extension, delay, or waiver”
Three Implications
FOR ANTHROPIC IPO BUYERS Class A carries 49.9% of the general vote in total, and the Class F share’s 50.1% does not shrink as the co-founders sell, the filing says.
FOR THE CO-FOUNDERS Each must keep at least 2% of their IPO-day Class A stake to remain a Continuing Founder, and a removal for falling below it needs notice from a majority of the other members, the filing says.
FOR GOVERNANCE WATCHERS The figures to track are the number of Continuing Founders, any notice of removal, and filings that report co-founder sales after the lock-up.
The framework reads: “It is where decisions are made about who gets access to frontier intelligence, under what conditions, and for which purposes.”
As we read it, the Founder LLC is where those decisions meet the share register: seven people, one vote each, cast a fixed 50.1% of the general vote, and each keeps that seat while holding about 4.7 million to 4.8 million shares, by our arithmetic. The framework predates the filing and does not discuss it.
What Is Not Established
Anthropic has not priced its IPO, and the co-founders are expected to sign the Founder LLC Agreement shortly before the registration statement becomes effective, the filing says. The floor figures are our arithmetic from beneficial ownership, which counts options exercisable within 60 days, so they are approximate. The sell-down is a hypothetical used to size the rule, not a plan any co-founder has stated. This is not investment advice.
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Each Anthropic co-founder stays in the LLC that casts a fixed 50.1% of the vote while holding at least 2% of their IPO-day Class A stake, the filing says: about 4.7 million to 4.8 million shares each. The other 98% is worth about $121.4 billion at the $74.00 midpoint, by our arithmetic. The 50.1% ends 450 days after fewer than three continuing founders have remained for 90 days, or by redemption or dissolution.
A note on sourcing. All Anthropic figures and quotations are from its Form S-1/A (Amendment No. 2) filed with the SEC on 10 November 2026, read in its prospectus summary, risk factors, Our Governance Structure and Its Goals, Principal and Selling Stockholders and Description of Capital Stock (Sunset Provisions) sections. The 2% floors, the value above them, the vote and equity shares at the floor, the multiple and the 540-day sum are our arithmetic. We did not contact Anthropic for this piece.
Gennaro Cuofano is a CRO and tech executive who has worked in AI since late 2015, starting with bringing NLP, natural-language generation, voice and chatbot products to the marketing industry. His background is in law and finance: he holds a Master's degree in Law and an International MBA with an emphasis on corporate finance (LUISS Business School and the University of San Diego, 2012), and worked as a financial analyst at a real-estate investment firm in San Diego and as an assistant controller. His work focuses on business model strategy, business engineering and, more broadly, structural analysis: how companies make money, read from their own filings. He created FourWeekMBA and leads research there and at The Business Engineer, his newsletter on AI and business strategy, with over 95,000 subscribers and more than 1,000 published analyses. His writing has also appeared on Entrepreneur (for example, How to Digitize a Family Business in Europe) and HackerNoon. Find him on LinkedIn and Substack. See how we source.
