Rush Street Interactive, Inc. 8-KCurrent Reports (8-K / ad hoc)

Changes / Accountants

Item 9.01 Financial Statements and Exhibits. (d) Exhibits Exhibit No. Description 99.1 Press Release, dated July 29 , 2026, reporting financial results for the second quarter ended June 3 0 , 2026. 104 Cover Page Interactive Data File (embedded within the Inline XBRL document). SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. RUSH STREET INTERACTIVE, INC. By: /s/ Kyle Sauers Name: Kyle Sauers Title: President and Chief Financial Officer Dated: July 29, 2026