“Anthropic's seven co-founders will be the 'sole members' of a new entity called 'Founder LLC' that will hold 50.1% of the voting power of the company's outstanding shares in its IPO structure.”

The filing itself states the arrangement in close to the words the post uses. The S-1 says that immediately prior to the completion of the offering Anthropic will issue a single share of Class F common stock to a limited liability company organized by its co-founders, the "Founder LLC," and that Dario Amodei, Daniela Amodei and the five other co-founders "will initially be the sole members of the Founder LLC." The same passage states that the Class F share "will be entitled to an aggregate number of votes that equals 50.1% of the total voting power of our outstanding shares of capital stock with respect to matters submitted to stockholders generally, including the election of our directors other than the Class T directors," and that the Class F stock "will not have any economic rights." An earlier confidential draft names the seven people: "our seven co-founders, Dario Amodei, Daniela Amodei, Tom Brown, Jack Clark, Jared Kaplan, Sam McCandlish, and Christopher Olah," who will initially be the sole members of the Founder LLC, with a successor member admitted for a specified period on the incapacity or death of any co-founder. The quoted sentence used in the post also appears in the filing's risk factors: the company says it expects that the LTBT and the Founder LLC will collectively have the ability to elect all members of its board, "and the Founder LLC will have the ability to determine the outcome of all matters submitted to a vote of our stockholders generally for the foreseeable future." The filing also sets out limits the one-sentence claim does not carry. The Class F share is voted by the Founder LLC as determined by a majority of its members, with each Continuing Founder entitled to one vote, and a Continuing Founder is removed on resignation, death or incapacity, or on falling below a share-ownership threshold. If the Continuing Founders cannot agree, the Class F share is generally voted proportionately with the votes of Class A common stock cast on the matter. Separately, through Class T common stock the Long-Term Benefit Trust generally has authority to elect and remove the Class T directors, who together will constitute a majority of the authorized members of the board. The structure also has an end condition: a "Class F Sunset Event" is defined as the first time the company has fewer than three Qualifying Members for ninety consecutive calendar days, followed by a 450-day Class F Transition Period. On the "seven" count, the filing addresses an eighth person commonly described as a founder: it states that Benjamin Mann "has been an integral part of Anthropic since its founding in January 2021 and, given his role in establishing Anthropic, is often referred to as a co-founder." Reporting on the filing quotes it as saying Mann "is not a member of the Founder LLC nor a Continuing Founder upon the completion of this offering, and accordingly will not participate in determining how our Class F common stock is voted."