Company: SLDE
Filing Date: 2025-06-17
Form Type: 8-A12B
Source: 0001193125-25-141981
Chunk: 1

Company: Slide Insurance Holdings, Inc.
Filing Date: 2025-06-17
Form: 8-A12B
Chunk 1
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 with the Securities and Exchange Commission pursuant to Rule 424(b) under
the Securities Act of 1933, as amended, shall be incorporated by reference herein.

Item 2: Exhibits

Pursuant to the “Instructions as to Exhibits” with respect to Form 8-A, no exhibits are
required to be filed because no other securities of the Registrant are registered on The Nasdaq Stock Market LLC and the securities registered hereby are not being registered pursuant to Section 12(g) of the Securities Exchange Act of 1934, as
amended.

SIGNATURE Pursuant to the requirements of Section 12 of the Securities Exchange Act of 1934, the Registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereto duly authorized.

| Slide Insurance Holdings, Inc. |     |                  |     |                         |
| By:                            |     | /s/ Jesse Schalk |     |                         |
|                                |     | Name:            |     | Jesse Schalk            |
|                                |     | Title:           |     | Chief Financial Officer |

Date: June 17, 2025