US Treasury meets bank CEOs over Anthropic’s Mythos cybersecurity risks

US Treasury Secretary convened major bank CEOs to address cybersecurity risks from Anthropic’s Mythos. The Polymarket contract for Anthropic’s IPO market cap landing between $100B and $200B by December 31, 2027 sits at 0.6% YES.

Market reaction

The Anthropic IPO market dropped from 1% yesterday to 0.6% YES. The decline coincides with concerns that regulatory scrutiny or negative sentiment around Mythos could weigh on Anthropic’s valuation at IPO.

Liquidity is thin: only $6 in USDC trades daily, and $45 is enough to shift the odds by 5 points. The market is vulnerable to swings on small volumes. Regulatory hurdles or a security incident involving Mythos could push IPO expectations lower still.

Why it matters

The Treasury-level meeting signals that Mythos’s capabilities have drawn direct government attention, which creates concrete regulatory risk for Anthropic ahead of any IPO. At 0.6¢, a YES share pays $1 if Anthropic’s market cap lands in the $100B–$200B range on IPO day, a 167x return. That payout requires Anthropic to both go public and clear the regulatory and reputational risks now accumulating around Mythos.

What to watch

Follow-up statements from the Treasury or SEC on AI regulation would be the most direct catalyst. Any cybersecurity initiatives announced by major banks in response to Mythos could also move sentiment on this contract.

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