If the Clay Mathematics Institute officially announces the award of a Millennium Prize for any unsolved Millennium Prize Problem before Jan 1, 2027, then the market resolves to Yes. The Clay Mathematics Institute must officially announce that a Millennium Prize has been awarded for the complete solution of the specified problem. The solution must be a positive proof as originally stated, not a counterexample or disproof (unless the market specifically includes counterexamples). Announcements of submitted solutions, peer-reviewed publications without CMI verification, or partial solutions do not qualify. If a mathematician solves a problem but declines the monetary prize, the market still resolves to Yes if CMI officially announces the prize award. The Poincaré Conjecture has already been solved by Grigori Perelman. This market will close and expire early if the Clay Mathematics Institute announces a Millennium Prize award.