SCHEDULE 13G 0002008627 XXXXXXXX LIVE Class A common shares, $0.0000011951862 par value per share 09/30/2025 0001997350 Accelerant Holdings G00894108 Unit 106, Windward 3 Regatta Office Park, West Bay Road Grand Cayman E9 KY1-1108 Rule 13d-1(d) Lee-Smith Christopher X0 20386940 0 20386940 0 20386940 N 17.4 IN Notwithstanding the percentage reported in row 11, and excluding the Class A common shares underlying the Reporting Person's options, which are not exercisable within 60 days but have been included in the Reporting Person's beneficial ownership as reported herein out of abundance of caution, the Reporting Person owns approximately 8.0% of the aggregate Class A common shares and Class B common shares outstanding, and the Reporting Person's voting power represents approximately 1.5% of the aggregate voting power of the Issuer. Accelerant Holdings Unit 106, Windward 3, Regatta Office Park, West Bay Road, Grand Cayman, Cayman Islands, KY1-1108 Christopher Lee-Smith (the "Reporting Person") Unit 106, Windward 3, Regatta Office Park, West Bay Road, Grand Cayman, Cayman Islands, KY1-1108 United Kingdom Y As of September 30, 2025, the Reporting Person may be deemed the beneficial owner of 20,386,940 Class A common shares. This amount includes 17,640,679 Class A common shares and 2,746,261 Class A common shares the Reporting Person has the right to acquire upon exercise of options. The Issuer has two classes of Common Stock: Class A common shares and Class B common shares. Each Class A common share is entitled to one vote per share, and each Class B common share is entitled to ten votes per share. As of September 30, 2025, the Reporting Person may be deemed the beneficial owner of approximately 17.4% of the Class A common shares outstanding or, excluding the Class A common shares underlying the Reporting Person's options, which are not exercisable within 60 days but have been included in the Reporting Person's beneficial ownership as reported herein out of an abundance of caution, approximately 8.0% of the aggregate Class A common shares and Class B common shares outstanding. The Reporting Person's aggregate voting power represents approximately 1.5% of the voting power of the Issuer. The beneficial ownership percentage of the Class A common shares set forth herein is calculated based on the sum of (i) 114,578,616 Class A common shares outstanding as of September 30, 2025, as reported in the Issuer's quarterly report on Form 10-Q filed with the Securities and Exchange Commission on November 12, 2025, and (ii) 2,746,261 Class A common shares the Reporting Person has the right to acquire upon exercise of options, which Class A common shares have been added to the quantity of Class A common shares outstanding in accordance with Rule 13d-3(d)(1)(i) under the Securities Exchange Act of 1934, as amended. The aggregate percentage ownership of the Class A common shares and Class B common shares, and the Reporting Person's aggregate voting power set forth herein, are also based on 107,241,428 Class B common shares outstanding as of September 30, 2025, as reported in the Issuer's quarterly report on Form 10-Q filed with the Securities and Exchange Commission on November 12, 2025. 20,386,940 0 20,386,940 0 Y Y Y Y Y Y Exhibit 1: Power of Attorney, dated September 19, 2025 Lee-Smith Christopher /s/ David Pelsue 11/14/2025