Company: SLDE
Filing Date: 2025-06-20
Form Type: S-8
Source: 0001193125-25-143281
Chunk: 0

Company: Slide Insurance Holdings, Inc.
Filing Date: 2025-06-20
Form: S-8
Chunk 0
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As filed with the Securities and Exchange Commission on June 20, 2025 Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Slide Insurance Holdings, Inc. (Exact Name of Registrant as Specified in Its Charter)

| Delaware                        |     |                       871554861 |
| (State or Other Jurisdiction of 
 Incorporation or Organization)  |     | -I.R.S. Employer Identification 
                             No. |

4221 W. Boy Scout Blvd., Suite 200 Tampa, Florida 33607 (Address of Principal Executive Offices) (Zip Code) Slide Insurance Holdings, Inc. 2025 Omnibus Incentive Plan Slide Holdings, Inc. 2021 Equity Compensation Plan (Full Title of the Plans) Bruce Lucas Chief Executive Officer Slide Insurance Holdings, Inc. 4221 W. Boy Scout Blvd., Suite 200 Tampa, FL, 33607 (Name and Address of Agent For Service) (713) 927-4538 (Telephone Number, Including Area Code, of Agent for Service) Copies to: Richard D. Truesdell, Jr. Adam Kaminsky Joseph S. Payne Davis Polk & Wardwell LLP 450 Lexington Avenue New York, New York 10017 (212) 450-4000 Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-acceleratedfiler, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2of the Exchange Act.

| Large accelerated filer |     | ☐                                               |     | Accelerated filer         |     | ☐ |
| Non-accelerated filer   |     | ☒ (Do not check if a smaller reporting company) |     | Smaller reporting company |     | ☐ |
|                         |     |                                                 |     | Emerging growth company   |     | ☒ |

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ☐

PART I

INFORMATION REQUIRED IN THE SECTION