Rush Street Interactive, Inc. — Director's Dealing 2025

Jul 9, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Rush Street Interactive, Inc. (RSI)
CIK: 0001793659
Period of Report: 2025-07-03

Reporting Person: de Masi Niccolo (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-07-03	Class A Common Stock	S	111478	$15.1033	Disposed	780710	Indirect
2025-07-07	Class A Common Stock	S	276163	$15.1481	Disposed	504547	Indirect
2025-07-08	Class A Common Stock	S	58453	$15.2783	Disposed	446094	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Class A Common Stock	15203	Direct

Footnotes

F1: Shares were sold pursuant to a 10b5-1 Plan dated March 14, 2025.

F2: The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $15.00 to $15.24 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F3: These shares are held directly by Isalea Investments LP, of which the Reporting Person is the Managing Member. The Reporting Person may be deemed to have beneficial ownership of the shares held directly by Isalea Investments LP. The Reporting Person disclaims beneficial ownership of such shares, and this Form 4 shall not be deemed an admission that the Reporting Person is the beneficial owner of the shares for purposes of Section 16 or for any other purpose.

F4: The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $15.00 to $15.28 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

F5: The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $15.10 to $15.40 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.