Exhibit 99.1 RUSH STREET INTERACTIVE ANNOUNCES FIRST QUARTER 2024 RESULTS AND RAISES FULL YEAR GUIDANCE - First Quarter Revenue of $217 Million, up 34% Year-over-Year - - First Quarter Net Loss of $2 Million - - Strong Operating Momentum Drives First Quarter Adjusted EBITDA of $17 Million - - Raising Full Year 2024 Adjusted EBITDA Guidance 38% at the Midpoint with a Revised Range of Between $50 and $60 Million - CHICAGO – May 1, 2024 – Rush Street Interactive, Inc. (NYSE: RSI) (“RSI”), a leading online casi ...