If the Nasdaq 100 index value on Dec 31, 2026 at 4pm EST is between 25500 and 25999.99, then the market resolves to Yes. The market will close on December 31, 2026. The market will expire at the sooner of the first release of the data, or one week after December 31, 2026. Pursuant to the Kalshi Rulebook, the Exchange has modified the Source Agency and Underlying for indices markets. See the rules for more information.