Washington, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACTOF 1934 For the quarterly period ended June30, 2026OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACTOF 1934 For the transition period from_______to_______Commission file number: 001-39232 Rush Street Interactive, Inc. (Exact name of registrant as specified in its charter) Delaware 84-3626708 (State or other jurisdiction ofincorporation or organization) (I.R.S. EmployerIdentification No.) Securities registered pursuant to Section 12(b) of the Act: Title of each class Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Actof 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject tosuch filing requirements for the past 90 days. YesNo Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). YesNo Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reportingcompany, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and“emerging growth company” in Rule 12b-2 of the Exchange Act. If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying withany new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐ Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes☐No Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date. As of July29, 2026, there were 115,626,347 shares outstanding of the registrant’s Class A common stock, $0.0001 par value per share, and116,147,011 shares outstanding of the registrant’s Class V common stock, $0.0001 par value per share. TABLE OF CONTENTSRush Street Interactive, Inc. Cautionary Note Regarding Forward-Looking StatementsiPART I. FINANCIAL INFORMATIONItem 1.Financial StatementsF-1Item 2.Management’s Discussion and Analysis of Financial Condition and Results of Operations20Item 3.Quantitative and Qualitative Disclosures about Market Risk33Item 4.Controls and Procedures34PART II. OTHER INFORMATIONItem 1.Legal Proceedings35Item 1A.Risk Factors35Item 2.Unregistered Sales of Equity Securities and Use of Proceeds35Item 5.Other Information36Item 6.Exhibits37SIGNATURE38 Cautionary Note Regarding Forward-Looking Statements This Quarterly Report on Form 10-Q (this “Report”) contains forward-looking statements within the meaning of the “safe harbor”provisions of the Private Securities Litigation Reform Act of 1995, as amended, that reflect future plans, estimates, beliefs andexpected performance. The forward-looking statements depend upon events, risks and uncertainties that may be outside of our control.Thewords“anticipate,”“believe,”“continue,”“could,”“estimate,”“expect,”“intends,”“may,”“might,”“plan,”“possible,”“potential,” “predict,” “project,” “should,” “would” and similar expressions may identify forward-looking statements, but the absenceof these words does not mean that a statement is not forward-looking. Any statements contained herein that are not statements ofhistorical fact may be forward-looking statements. Our projections, including for revenues, market share, expenses and profitability, are subject to significant risks, assumptions,estimates and uncertainties. You are cautioned that our business and operations are subject to a variety of risks and uncertainties, manyof which are beyond our control, and, consequently, our actual results may differ materially from those projected. Factors that could cause or contribute to such differences include, but are not limited to, the following: •competition in the online casino, online sports betting and retail sports betting (i.e., such as within a bricks-and-mortarcasino) industries is intense; we face competition from many discretionary leisure and entertainment providers, includingfrom prediction markets operators, and, as a result, we may fail to attract and/or retain customers, which may negativelyimpact our operations, growth prospects and financial condition;•economic downturns, such as recessions, inflation, and political and market conditions beyond our control, including areduction in consumer discretionary spending, tariffs and trade wars, and sports leagues shortening, delaying orcancelling parts of their seasons or certain events due to external fac