Company: SLDE
Filing Date: 2025-06-18
Form Type: 424B4
Source: 0001193125-25-142810
Chunk: 21

Company: Slide Insurance Holdings, Inc.
Filing Date: 2025-06-18
Form: 424B4
Chunk 21
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 prior to the closing of this offering into 51,374,125 shares of our common stock, which will occur upon the closing of this offering, but excludes:

| • |     | 14,093,750 shares of common stock issuable upon the exercise of options outstanding as of March 31, 2025 at 
 a weighted average exercise price of $0.84 per share (after giving effect to the Stock Split);              |

| • |     | 12,000,000 shares of common stock reserved for future issuance under our 2025 Omnibus Incentive Plan (the 
 “2025 Plan”);                                                                                             |

| • |     | 87,940 shares of common stock reserved for future issuance under our 2021 Equity Compensation Plan (the 
 “Prior Plan”); and                                                                                      |

| • |     | 2,120,729 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:

| • |     | reflects the initial public offering price of $17.00 per share; |

| • |     | gives effect to 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 51,374,125 shares of our common stock, which will occur upon the closing of this offering; |

| • |     | gives effect to, 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                           |

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| prospectus, the Stock Split, which will occur after the effectiveness of the registration statement of which this prospectus forms a part; |

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

| • |     | gives effect to 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 its 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