Company: RSI
Filing Date: 2025-04-14
Form Type: DEF 14A
Source: 0001793659-25-000098
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Company: Rush Street Interactive, Inc.
Filing Date: 2025-04-14
Form: DEF 14A
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<div align='center'>F</div>

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### SCHEDULE 14A

#### Proxy Statement Pursuant to Section 14(a) of the
<div align='center'>Securities Exchange Act of 1934 (Amendment No. __)</div>

Filed by the Registrant ☒

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.
<div align='center'>(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)</div>

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 |

#### RUSH STREET INTERACTIVE, INC.

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

#### Chicago, Illinois 60611
April 14, 2025

Dear Stockholders of Rush Street Interactive, Inc.:

On behalf of the Board of Directors, you are cordially invited to attend the 2025 annual meeting of stockholders of Rush Street Interactive, Inc., a Delaware corporation (“RSI”, the “Company,” “we,” “us,” or “our”), which will be held on May 29, 2025, at 9:00 a.m., Central Time (10:00 a.m., Eastern time).

After careful consideration we have determined that the annual meeting will be a virtual meeting conducted exclusively via live webcast in order to facilitate stockholder attendance. You or your proxyholder will be able to attend and submit questions and vote at the annual meeting by visiting https://www.cstproxy.com/rushstreetinteractive/2025 and using a control number assigned by Continental Stock