If Sia has a #1 song on the Billboard Hot 100 (including features), by the Billboard issue for the week of Dec 26, 2026, then the market resolves to Yes. **This market and these products have not been endorsed by Billboard. Any references to "Billboard", the "Hot 100," or any other associated marks are descriptive only, and do not indicate an endorsement of this product or any affiliation between Billboard and Kalshi.** For the purposes of this market, the last Billboard chart that will be included is the one published for Dec 26, 2026. If this event occurs, the market will close the following 10:00 AM ET.