Company: SLDE
Filing Date: 2025-05-23
Form Type: S-1
Source: 0001193125-25-125836
Chunk: 22

Company: Slide Insurance Holdings, Inc.
Filing Date: 2025-05-23
Form: S-1
Chunk 22
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 for future issuance under our 2021 Equity Compensation Plan 
 (the “Prior Plan”); and                                                                     |

| • |     | shares of common stock issuable upon the vesting and settlement of restricted stock units 
 under our 2021 Equity Compensation Plan.                                                  |

Unless we specifically state otherwise, all information in this prospectus assumes:

| • |     | the automatic conversion of all outstanding shares of our Series A preferred stock, $0.01 par value per share                                                                   
 (the “Series A preferred stock”) into     shares of our common stock, which will occur immediately after the Stock Split and immediately prior to the closing of this offering; |

| • |     | except in the case of the audited consolidated financial statements and unaudited consolidated financial 
 statements and related notes to those statements included elsewhere in this prospectus, the Stock Split, |

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| which will occur after the effectiveness of the registration statement of which this prospectus forms a part and immediately prior to the automatic conversion of certain shares of common stock 
 described in the previous bullet;                                                                                                                                                                |

| • |     | no exercise of the option to purchase additional shares of common stock by the underwriters; and |

| • |     | the filing of our amended and restated certificate of incorporation and the adoption of our amended and restated 
 bylaws immediately prior to the closing of this offering.                                                        |

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SUMMARY CONSOLIDATED FINANCIAL AND OTHER DATA The following tables present summary historical consolidated financial and other data of Slide Insurance Holdings, Inc., along with their wholly owned subsidiaries. The summary historical consolidated financial and other data presented below do not purport to be indicative of the results that can be expected for any future period and should be read together with “Capitalization,” “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our consolidated financial statements and the related notes included elsewhere in this prospectus.

|                                                    |     |                   Three Months Ended 
                            March 31, 
                                 2025 |         |   |     | 2024 |         |   |     |         Year Ended 
       December 31, 
               2024 |           |   |     | 2023 |          |   |
|:---------------------------------------------------|:----|-------------------------------------:|--------:|:--|:----|-----:|--------:|:--|:----|-------------------:|----------:|:--|:----|-----:|---------:|: