Senator Elizabeth Warren has written to Anthropic's chief executive, Dario Amodei, demanding answers by November 3 about what the company's own stock-market filing says its technology could do. In the letter, dated October 27 and released by the Senate Banking Committee on Wednesday, Warren — the committee's ranking Democrat — points to the risk disclosures in Anthropic's IPO registration statement, which warn that sufficiently advanced AI models could pose "catastrophic or existential risks to humanity," particularly if such systems were misused, weaponised or left to operate with a high degree of autonomy. Her release says she drew on some 90 pages of risks detailed in the filing.
Warren's letter, four pages of questions as reported by the Wall Street Journal, asks whether Amodei believes his company's models pose an existential threat to humanity, what safeguards are in place against losing control of the systems, autonomous cyberattacks, biological-weapons development and economic disruption, what the company's relationships with Amazon and Broadcom mean for conflicts of interest, and how a valuation approaching $2 trillion is justified. She also asks how Anthropic can act consistently with its stated public benefit and its fiduciary duties under Delaware law without mitigating the risks it disclosed.
Her sharpest warning is aimed at ordinary savers. Index providers this year scrapped the waiting periods that used to keep newly listed stocks out of major indexes, so, in her words, index funds investing Americans' retirement savings will be "forced to buy" Anthropic shares even if the stock is volatile or overvalued — and a listing of this size, she argues, could inject extreme volatility into the markets from day one and into the retirement accounts that track them. She adds that the fact the company is "burning through cash" is not a reason to expose everyday Americans to its risks.
Anthropic did not immediately respond to a request for comment on the letter, and no on-the-record response from the company had appeared in the coverage checked. The company's own answer sits inside its filing, where the founders write that building AI means harnessing cognition itself, which can be used for ill as well as good, and present full disclosure as the point of the exercise. Analyst Brian Mulberry of Zacks makes the same structural point: an IPO must show investors very clearly what risks they face, because full disclosure is a condition of listing on a U.S. exchange. One reading of the filing also cuts against the "burning through cash" line: on ALFW's analysis, Anthropic posted its first operating profit in the second quarter of 2026 — $974 million of operating income on $11.56 billion of revenue — though operating income is not the same as cash flow. Warren is not the first official to press the pause button: New York City Comptroller Mark Levine, whose pension funds hold a small Anthropic stake, wrote to Amodei on October 14 urging the company to delay the IPO until it transparently addresses its safety and governance risks. The company filed anyway.
For citizens, Warren's argument is that this decision is no longer one investors get to make for themselves. Because index funds must buy what the index holds, millions of Americans saving for retirement through workplace plans and index funds will own a piece of Anthropic once it lists — whether or not they would ever have chosen a stock whose own filing warns of catastrophic risk and whose price could swing violently. That is why the answers she is demanding by November 3 matter beyond Wall Street: they are the public record on which ordinary savers' money is about to ride.
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