# EDGAR Filing Document

**Accession Number:** 0001793659
**File Stem:** 0001793659-26-000039
**Filing Date:** 2026-5
**Character Count:** 3744
**Document Hash:** eafaac8835974eaeebc1e02c0634e216
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001793659-26-000039.hdr.sgml**: 20260508

**ACCESSION NUMBER**: 0001793659-26-000039

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260508

**DATE AS OF CHANGE**: 20260508

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Rush Street Interactive, Inc.
- **CENTRAL INDEX KEY:** 0001793659
- **STANDARD INDUSTRIAL CLASSIFICATION:** SERVICES-MISCELLANEOUS AMUSEMENT & RECREATION [7990]
- **ORGANIZATION NAME:** 07 Trade & Services
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-39232
- **FILM NUMBER:** 26959545

**BUSINESS ADDRESS:**
- **STREET 1:** 900 N. MICHIGAN AVENUE, SUITE 950
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60611
- **BUSINESS PHONE:** 773-893-5855

**MAIL ADDRESS:**
- **STREET 1:** 900 N. MICHIGAN AVENUE, SUITE 950
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60611

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** dMY Technology Group, Inc.
- **DATE OF NAME CHANGE:** 20191108

**UNITED STATES** 

**SECURITIES AND EXCHANGE COMMISSION** 

**Washington, D.C. 20549** 

**SCHEDULE 14A** 

**Proxy Statement Pursuant to Section 14(a) of the** 

**Securities Exchange Act of 1934 (Amendment No. __)** 

Filed by the Registrant ☒&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

Filed by a Party other than the Registrant ☐

Check the appropriate box:

☐ Preliminary Proxy Statement

☐ **Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))**

☐ Definitive Proxy Statement

☒ Definitive Additional Materials

☐ Soliciting Material under §240.14a-12

**Rush Street Interactive, Inc.** 

**(Name of Registrant as Specified In Its Charter)** 

**(Name of Person(s) Filing Proxy Statement, if other than the Registrant)** 

Payment of Filing Fee (Check all boxes that apply):

☒ No fee required

☐ Fee paid previously with preliminary materials

☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

------

![rsia.jpg](rsia.jpg)

**RUSH STREET INTERACTIVE, INC.** 

**900 N. Michigan Avenue, Suite 950** 

**Chicago, Illinois 60611**

SUPPLEMENT TO DEFINITIVE PROXY STATEMENT DATED APRIL 24, 2026

FOR THE 2026 ANNUAL MEETING OF STOCKHOLDERS

TO BE HELD ON WEDNESDAY, JUNE 3, 2026

This supplement (the "Supplement") amends and supplements the Notice of 2026 Annual Meeting of Stockholders and Proxy Statement of Rush Street Interactive, Inc. (the "Company"), dated April 24, 2026 (the "Proxy Statement"), provided to stockholders in connection with the Company's 2026 Annual Meeting of Shareholders to be held on June 3, 2026. This Supplement is being filed with the Securities and Exchange Commission and is being made available to shareholders on or about May 8, 2026.

This Supplement updates the disclosure in the Proxy Statement (pages 4 and 40) relating to the effect of "broker non-votes" on Proposal No. 3 - Amendments to the Charter. The voting options for this proposal are "FOR", "AGAINST" or "ABSTAIN". "Broker non-votes," if any, will count as votes "AGAINST" this proposal.

Except as specifically supplemented by the information in this Supplement, all information set forth in the Proxy Statement remains unchanged. From and after the date of this Supplement, all references to the "Proxy Statement" are to the Proxy Statement as supplemented hereby. The Proxy Statement contains important information, and this Supplement should be read in conjunction with the Proxy Statement.

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