Company: SLDE
Filing Date: 2025-06-09
Form Type: S-1/A
Source: 0001193125-25-137410
Chunk: 23

Company: Slide Insurance Holdings, Inc.
Filing Date: 2025-06-09
Form: S-1/A
Chunk 23
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 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.                                                                        |

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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 51,374,125 shares of our common stock, which will occur upon 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, which will occur after the effectiveness of the registration statement of which this prospectus forms a part; |

| • |     | 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 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 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 |