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

May 30, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Rush Street Interactive, Inc. (RSI)
CIK: 0001793659
Period of Report: 2025-05-29

Reporting Person: de Masi Niccolo (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-05-29	Class A Common Stock	A	10958	—	Acquired	15203	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Class A Common Stock	1784375	Indirect

Footnotes

F1: On May 29, 2025, the Reporting Person was awarded 10,958 restricted stock units (the "RSUs") under the Rush Street Interactive, Inc. 2020 Omnibus Equity Incentive Plan, as amended. The RSUs vest as of the Issuer's next annual meeting of stockholders to be held in calendar year 2026.

F2: 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.