Exhibit 99.1 RUSH STREET INTERACTIVE ANNOUNCES FOURTH QUARTER AND FULL YEAR 2023 RESULTS - Fourth Quarter Revenue of $194 Million, up 17% Year-over-Year - - Full Year 2023 Revenue of $691 Million, up 17% - - Fourth Quarter and Full Year Net Loss of $5.5 Million and $60.1 Million, respectively - - Fourth Quarter and Full Year Adjusted EBITDA of $11.5 Million and $8.2 Million, respectively - - Strong Fourth Quarter 2023 Momentum Reflected in Full Year 2024 Revenue Guidance of Between $770 and $830 Million - - ...