ARX

SEC source: 0000905148-25-002639 · form4.xml · derivative · entry 15

Schwartz Keoni Andrew · CIK 0002009246 · Director · 10% owner

ACP Accelerant Holdings, L.P. · CIK 0002078270 · 10% owner

ACP Insurance Management, LLC · CIK 0002078277 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Class B Common Shares · 5,427,970 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F6 · derivative.exercise_price: In connection with the Issuer's IPO, these shares of the Issuer's Preference Shares automatically converted into Class B Common Shares of the Issuer at a 1-for-1 conversion rate.

F6 · derivative.exercise_date: In connection with the Issuer's IPO, these shares of the Issuer's Preference Shares automatically converted into Class B Common Shares of the Issuer at a 1-for-1 conversion rate.

F6 · derivative.expiration_date: In connection with the Issuer's IPO, these shares of the Issuer's Preference Shares automatically converted into Class B Common Shares of the Issuer at a 1-for-1 conversion rate.

F7 · ownership.nature: These securities are held directly by ACP Accelerant Co-Invest, LLC. Each of (i) ACP Insurance Management, LLC, as the managing member of ACP Accelerant Co-Invest, LLC, and (ii) Mr. Schwartz, as the sole owner and managing member of ACP Insurance Management, LLC, may be deemed to have voting and dispositive power over these securities, but disclaim beneficial ownership over these securities except to the extent of their respective pecuniary interest therein, if any.

SEC source: 0000905148-25-002639 · form4.xml · derivative · entry 14

Schwartz Keoni Andrew · CIK 0002009246 · Director · 10% owner

ACP Accelerant Holdings, L.P. · CIK 0002078270 · 10% owner

ACP Insurance Management, LLC · CIK 0002078277 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Class A Common Shares · 2,670,456 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each holder of Class B Common Shares has the right to convert their Class B Common Shares into Class A Common Shares on a 1-for-1 basis at any time and at their option. Additionally, Class B Common Shares will automatically convert into Class A Common Shares, on a 1-for-1 basis, immediately following a transfer to any non-permitted holder of Class B Common Shares, and all outstanding Class B Common Shares will automatically convert into Class A Common Shares, on a 1-for-1 basis, on the earlier of: (i) if at any time following the consummation of the IPO, the holders of the Class B Common Shares immediately prior to the consummation of the IPO hold less than 50% of the total Class B Common Shares then in issue, and (ii) the third anniversary of the consummation of the Issuer's IPO.

F4 · kind: These Class B Common Shares converted into Class A Common Shares on a 1-for-1 basis and then were sold pursuant to an underwriting agreement dated as of July 23, 2025, by and among the Issuer, the selling stockholders, and the underwriters named therein in connection with the Issuer's IPO.

F4 · price: These Class B Common Shares converted into Class A Common Shares on a 1-for-1 basis and then were sold pursuant to an underwriting agreement dated as of July 23, 2025, by and among the Issuer, the selling stockholders, and the underwriters named therein in connection with the Issuer's IPO.

F3 · derivative.exercise_date: Each holder of Class B Common Shares has the right to convert their Class B Common Shares into Class A Common Shares on a 1-for-1 basis at any time and at their option. Additionally, Class B Common Shares will automatically convert into Class A Common Shares, on a 1-for-1 basis, immediately following a transfer to any non-permitted holder of Class B Common Shares, and all outstanding Class B Common Shares will automatically convert into Class A Common Shares, on a 1-for-1 basis, on the earlier of: (i) if at any time following the consummation of the IPO, the holders of the Class B Common Shares immediately prior to the consummation of the IPO hold less than 50% of the total Class B Common Shares then in issue, and (ii) the third anniversary of the consummation of the Issuer's IPO.

F3 · derivative.expiration_date: Each holder of Class B Common Shares has the right to convert their Class B Common Shares into Class A Common Shares on a 1-for-1 basis at any time and at their option. Additionally, Class B Common Shares will automatically convert into Class A Common Shares, on a 1-for-1 basis, immediately following a transfer to any non-permitted holder of Class B Common Shares, and all outstanding Class B Common Shares will automatically convert into Class A Common Shares, on a 1-for-1 basis, on the earlier of: (i) if at any time following the consummation of the IPO, the holders of the Class B Common Shares immediately prior to the consummation of the IPO hold less than 50% of the total Class B Common Shares then in issue, and (ii) the third anniversary of the consummation of the Issuer's IPO.

F5 · ownership.nature: These securities are held directly by ACP Accelerant Investment Holding Company, Ltd. ACP Accelerant Holdings, L.P. is the sole owner of ACP Accelerant Investment Holding Company, Ltd. Each of (i) ACP Insurance Management, LLC, as the general partner of ACP Accelerant Holdings, L.P., and (ii) Mr. Schwartz, as the sole owner and managing member of ACP Insurance Management, LLC, may be deemed to have voting and dispositive power over these securities, but disclaim beneficial ownership over these securities except to the extent of their respective pecuniary interest therein, if any.

SEC source: 0000905148-25-002639 · form4.xml · derivative · entry 13

Schwartz Keoni Andrew · CIK 0002009246 · Director · 10% owner

ACP Accelerant Holdings, L.P. · CIK 0002078270 · 10% owner

ACP Insurance Management, LLC · CIK 0002078277 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 2,670,456

Underlying: Class A Common Shares · 2,670,456 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each holder of Class B Common Shares has the right to convert their Class B Common Shares into Class A Common Shares on a 1-for-1 basis at any time and at their option. Additionally, Class B Common Shares will automatically convert into Class A Common Shares, on a 1-for-1 basis, immediately following a transfer to any non-permitted holder of Class B Common Shares, and all outstanding Class B Common Shares will automatically convert into Class A Common Shares, on a 1-for-1 basis, on the earlier of: (i) if at any time following the consummation of the IPO, the holders of the Class B Common Shares immediately prior to the consummation of the IPO hold less than 50% of the total Class B Common Shares then in issue, and (ii) the third anniversary of the consummation of the Issuer's IPO.

F1 · price: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class B Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F3 · derivative.exercise_date: Each holder of Class B Common Shares has the right to convert their Class B Common Shares into Class A Common Shares on a 1-for-1 basis at any time and at their option. Additionally, Class B Common Shares will automatically convert into Class A Common Shares, on a 1-for-1 basis, immediately following a transfer to any non-permitted holder of Class B Common Shares, and all outstanding Class B Common Shares will automatically convert into Class A Common Shares, on a 1-for-1 basis, on the earlier of: (i) if at any time following the consummation of the IPO, the holders of the Class B Common Shares immediately prior to the consummation of the IPO hold less than 50% of the total Class B Common Shares then in issue, and (ii) the third anniversary of the consummation of the Issuer's IPO.

F3 · derivative.expiration_date: Each holder of Class B Common Shares has the right to convert their Class B Common Shares into Class A Common Shares on a 1-for-1 basis at any time and at their option. Additionally, Class B Common Shares will automatically convert into Class A Common Shares, on a 1-for-1 basis, immediately following a transfer to any non-permitted holder of Class B Common Shares, and all outstanding Class B Common Shares will automatically convert into Class A Common Shares, on a 1-for-1 basis, on the earlier of: (i) if at any time following the consummation of the IPO, the holders of the Class B Common Shares immediately prior to the consummation of the IPO hold less than 50% of the total Class B Common Shares then in issue, and (ii) the third anniversary of the consummation of the Issuer's IPO.

F5 · ownership.nature: These securities are held directly by ACP Accelerant Investment Holding Company, Ltd. ACP Accelerant Holdings, L.P. is the sole owner of ACP Accelerant Investment Holding Company, Ltd. Each of (i) ACP Insurance Management, LLC, as the general partner of ACP Accelerant Holdings, L.P., and (ii) Mr. Schwartz, as the sole owner and managing member of ACP Insurance Management, LLC, may be deemed to have voting and dispositive power over these securities, but disclaim beneficial ownership over these securities except to the extent of their respective pecuniary interest therein, if any.

SEC source: 0000905148-25-002639 · form4.xml · derivative · entry 12

Schwartz Keoni Andrew · CIK 0002009246 · Director · 10% owner

ACP Accelerant Holdings, L.P. · CIK 0002078270 · 10% owner

ACP Insurance Management, LLC · CIK 0002078277 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Class B Common Shares · 2,670,456 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class B Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F1 · derivative.exercise_date: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class B Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F1 · derivative.expiration_date: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class B Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F5 · ownership.nature: These securities are held directly by ACP Accelerant Investment Holding Company, Ltd. ACP Accelerant Holdings, L.P. is the sole owner of ACP Accelerant Investment Holding Company, Ltd. Each of (i) ACP Insurance Management, LLC, as the general partner of ACP Accelerant Holdings, L.P., and (ii) Mr. Schwartz, as the sole owner and managing member of ACP Insurance Management, LLC, may be deemed to have voting and dispositive power over these securities, but disclaim beneficial ownership over these securities except to the extent of their respective pecuniary interest therein, if any.

SEC source: 0000905148-25-002639 · form4.xml · derivative · entry 11

Schwartz Keoni Andrew · CIK 0002009246 · Director · 10% owner

ACP Accelerant Holdings, L.P. · CIK 0002078270 · 10% owner

ACP Insurance Management, LLC · CIK 0002078277 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 82,085,342

Underlying: Class A Common Shares · 8,111,253 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each holder of Class B Common Shares has the right to convert their Class B Common Shares into Class A Common Shares on a 1-for-1 basis at any time and at their option. Additionally, Class B Common Shares will automatically convert into Class A Common Shares, on a 1-for-1 basis, immediately following a transfer to any non-permitted holder of Class B Common Shares, and all outstanding Class B Common Shares will automatically convert into Class A Common Shares, on a 1-for-1 basis, on the earlier of: (i) if at any time following the consummation of the IPO, the holders of the Class B Common Shares immediately prior to the consummation of the IPO hold less than 50% of the total Class B Common Shares then in issue, and (ii) the third anniversary of the consummation of the Issuer's IPO.

F4 · kind: These Class B Common Shares converted into Class A Common Shares on a 1-for-1 basis and then were sold pursuant to an underwriting agreement dated as of July 23, 2025, by and among the Issuer, the selling stockholders, and the underwriters named therein in connection with the Issuer's IPO.

F4 · price: These Class B Common Shares converted into Class A Common Shares on a 1-for-1 basis and then were sold pursuant to an underwriting agreement dated as of July 23, 2025, by and among the Issuer, the selling stockholders, and the underwriters named therein in connection with the Issuer's IPO.

F3 · derivative.exercise_date: Each holder of Class B Common Shares has the right to convert their Class B Common Shares into Class A Common Shares on a 1-for-1 basis at any time and at their option. Additionally, Class B Common Shares will automatically convert into Class A Common Shares, on a 1-for-1 basis, immediately following a transfer to any non-permitted holder of Class B Common Shares, and all outstanding Class B Common Shares will automatically convert into Class A Common Shares, on a 1-for-1 basis, on the earlier of: (i) if at any time following the consummation of the IPO, the holders of the Class B Common Shares immediately prior to the consummation of the IPO hold less than 50% of the total Class B Common Shares then in issue, and (ii) the third anniversary of the consummation of the Issuer's IPO.

F3 · derivative.expiration_date: Each holder of Class B Common Shares has the right to convert their Class B Common Shares into Class A Common Shares on a 1-for-1 basis at any time and at their option. Additionally, Class B Common Shares will automatically convert into Class A Common Shares, on a 1-for-1 basis, immediately following a transfer to any non-permitted holder of Class B Common Shares, and all outstanding Class B Common Shares will automatically convert into Class A Common Shares, on a 1-for-1 basis, on the earlier of: (i) if at any time following the consummation of the IPO, the holders of the Class B Common Shares immediately prior to the consummation of the IPO hold less than 50% of the total Class B Common Shares then in issue, and (ii) the third anniversary of the consummation of the Issuer's IPO.

F2 · ownership.nature: These securities are held directly by ACP Accelerant Holdings, L.P. Each of (i) ACP Insurance Management, LLC, as the general partner of ACP Accelerant Holdings, L.P., and (ii) Keoni Schwartz ("Mr. Schwartz"), as the sole owner and managing member of ACP Insurance Management, LLC, may be deemed to have voting and dispositive power over these securities, but disclaim beneficial ownership over these securities except to the extent of their respective pecuniary interest therein, if any.

SEC source: 0000905148-25-002639 · form4.xml · derivative · entry 10

Schwartz Keoni Andrew · CIK 0002009246 · Director · 10% owner

ACP Accelerant Holdings, L.P. · CIK 0002078270 · 10% owner

ACP Insurance Management, LLC · CIK 0002078277 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 90,196,595

Underlying: Class A Common Shares · 90,196,595 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each holder of Class B Common Shares has the right to convert their Class B Common Shares into Class A Common Shares on a 1-for-1 basis at any time and at their option. Additionally, Class B Common Shares will automatically convert into Class A Common Shares, on a 1-for-1 basis, immediately following a transfer to any non-permitted holder of Class B Common Shares, and all outstanding Class B Common Shares will automatically convert into Class A Common Shares, on a 1-for-1 basis, on the earlier of: (i) if at any time following the consummation of the IPO, the holders of the Class B Common Shares immediately prior to the consummation of the IPO hold less than 50% of the total Class B Common Shares then in issue, and (ii) the third anniversary of the consummation of the Issuer's IPO.

F1 · price: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class B Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F3 · derivative.exercise_date: Each holder of Class B Common Shares has the right to convert their Class B Common Shares into Class A Common Shares on a 1-for-1 basis at any time and at their option. Additionally, Class B Common Shares will automatically convert into Class A Common Shares, on a 1-for-1 basis, immediately following a transfer to any non-permitted holder of Class B Common Shares, and all outstanding Class B Common Shares will automatically convert into Class A Common Shares, on a 1-for-1 basis, on the earlier of: (i) if at any time following the consummation of the IPO, the holders of the Class B Common Shares immediately prior to the consummation of the IPO hold less than 50% of the total Class B Common Shares then in issue, and (ii) the third anniversary of the consummation of the Issuer's IPO.

F3 · derivative.expiration_date: Each holder of Class B Common Shares has the right to convert their Class B Common Shares into Class A Common Shares on a 1-for-1 basis at any time and at their option. Additionally, Class B Common Shares will automatically convert into Class A Common Shares, on a 1-for-1 basis, immediately following a transfer to any non-permitted holder of Class B Common Shares, and all outstanding Class B Common Shares will automatically convert into Class A Common Shares, on a 1-for-1 basis, on the earlier of: (i) if at any time following the consummation of the IPO, the holders of the Class B Common Shares immediately prior to the consummation of the IPO hold less than 50% of the total Class B Common Shares then in issue, and (ii) the third anniversary of the consummation of the Issuer's IPO.

F2 · ownership.nature: These securities are held directly by ACP Accelerant Holdings, L.P. Each of (i) ACP Insurance Management, LLC, as the general partner of ACP Accelerant Holdings, L.P., and (ii) Keoni Schwartz ("Mr. Schwartz"), as the sole owner and managing member of ACP Insurance Management, LLC, may be deemed to have voting and dispositive power over these securities, but disclaim beneficial ownership over these securities except to the extent of their respective pecuniary interest therein, if any.

SEC source: 0000905148-25-002639 · form4.xml · derivative · entry 9

Schwartz Keoni Andrew · CIK 0002009246 · Director · 10% owner

ACP Accelerant Holdings, L.P. · CIK 0002078270 · 10% owner

ACP Insurance Management, LLC · CIK 0002078277 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Class B Common Shares · 90,196,595 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class B Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F1 · derivative.exercise_date: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class B Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F1 · derivative.expiration_date: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class B Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F2 · ownership.nature: These securities are held directly by ACP Accelerant Holdings, L.P. Each of (i) ACP Insurance Management, LLC, as the general partner of ACP Accelerant Holdings, L.P., and (ii) Keoni Schwartz ("Mr. Schwartz"), as the sole owner and managing member of ACP Insurance Management, LLC, may be deemed to have voting and dispositive power over these securities, but disclaim beneficial ownership over these securities except to the extent of their respective pecuniary interest therein, if any.

SEC source: 0000905148-25-002639 · form4.xml · nonDerivative · entry 8

Schwartz Keoni Andrew · CIK 0002009246 · Director · 10% owner

ACP Accelerant Holdings, L.P. · CIK 0002078270 · 10% owner

ACP Insurance Management, LLC · CIK 0002078277 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 0

F4 · kind: These Class B Common Shares converted into Class A Common Shares on a 1-for-1 basis and then were sold pursuant to an underwriting agreement dated as of July 23, 2025, by and among the Issuer, the selling stockholders, and the underwriters named therein in connection with the Issuer's IPO.

F8 · ownership.nature: These securities are held directly by ACP Accelerant Investment Holding Company II, Ltd. ACP Accelerant Holdings, L.P. is the sole owner of ACP Accelerant Investment Holding Company II, Ltd. Each of (i) ACP Insurance Management, LLC, as the general partner of ACP Accelerant Holdings, L.P., and (ii) Mr. Schwartz, as the sole owner and managing member of ACP Insurance Management, LLC, may be deemed to have voting and dispositive power over these securities, but disclaim beneficial ownership over these securities except to the extent of their respective pecuniary interest therein, if any.

SEC source: 0000905148-25-002639 · form4.xml · nonDerivative · entry 7

Schwartz Keoni Andrew · CIK 0002009246 · Director · 10% owner

ACP Accelerant Holdings, L.P. · CIK 0002078270 · 10% owner

ACP Insurance Management, LLC · CIK 0002078277 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 326,312

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · kind: These Class B Common Shares converted into Class A Common Shares on a 1-for-1 basis and then were sold pursuant to an underwriting agreement dated as of July 23, 2025, by and among the Issuer, the selling stockholders, and the underwriters named therein in connection with the Issuer's IPO.

F4 · price: These Class B Common Shares converted into Class A Common Shares on a 1-for-1 basis and then were sold pursuant to an underwriting agreement dated as of July 23, 2025, by and among the Issuer, the selling stockholders, and the underwriters named therein in connection with the Issuer's IPO.

F8 · ownership.nature: These securities are held directly by ACP Accelerant Investment Holding Company II, Ltd. ACP Accelerant Holdings, L.P. is the sole owner of ACP Accelerant Investment Holding Company II, Ltd. Each of (i) ACP Insurance Management, LLC, as the general partner of ACP Accelerant Holdings, L.P., and (ii) Mr. Schwartz, as the sole owner and managing member of ACP Insurance Management, LLC, may be deemed to have voting and dispositive power over these securities, but disclaim beneficial ownership over these securities except to the extent of their respective pecuniary interest therein, if any.

SEC source: 0000905148-25-002639 · form4.xml · nonDerivative · entry 6

Schwartz Keoni Andrew · CIK 0002009246 · Director · 10% owner

ACP Accelerant Holdings, L.P. · CIK 0002078270 · 10% owner

ACP Insurance Management, LLC · CIK 0002078277 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 0

F4 · kind: These Class B Common Shares converted into Class A Common Shares on a 1-for-1 basis and then were sold pursuant to an underwriting agreement dated as of July 23, 2025, by and among the Issuer, the selling stockholders, and the underwriters named therein in connection with the Issuer's IPO.

F7 · ownership.nature: These securities are held directly by ACP Accelerant Co-Invest, LLC. Each of (i) ACP Insurance Management, LLC, as the managing member of ACP Accelerant Co-Invest, LLC, and (ii) Mr. Schwartz, as the sole owner and managing member of ACP Insurance Management, LLC, may be deemed to have voting and dispositive power over these securities, but disclaim beneficial ownership over these securities except to the extent of their respective pecuniary interest therein, if any.

SEC source: 0000905148-25-002639 · form4.xml · nonDerivative · entry 5

Schwartz Keoni Andrew · CIK 0002009246 · Director · 10% owner

ACP Accelerant Holdings, L.P. · CIK 0002078270 · 10% owner

ACP Insurance Management, LLC · CIK 0002078277 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 488,131

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · kind: These Class B Common Shares converted into Class A Common Shares on a 1-for-1 basis and then were sold pursuant to an underwriting agreement dated as of July 23, 2025, by and among the Issuer, the selling stockholders, and the underwriters named therein in connection with the Issuer's IPO.

F4 · price: These Class B Common Shares converted into Class A Common Shares on a 1-for-1 basis and then were sold pursuant to an underwriting agreement dated as of July 23, 2025, by and among the Issuer, the selling stockholders, and the underwriters named therein in connection with the Issuer's IPO.

F7 · ownership.nature: These securities are held directly by ACP Accelerant Co-Invest, LLC. Each of (i) ACP Insurance Management, LLC, as the managing member of ACP Accelerant Co-Invest, LLC, and (ii) Mr. Schwartz, as the sole owner and managing member of ACP Insurance Management, LLC, may be deemed to have voting and dispositive power over these securities, but disclaim beneficial ownership over these securities except to the extent of their respective pecuniary interest therein, if any.

SEC source: 0000905148-25-002639 · form4.xml · nonDerivative · entry 4

Schwartz Keoni Andrew · CIK 0002009246 · Director · 10% owner

ACP Accelerant Holdings, L.P. · CIK 0002078270 · 10% owner

ACP Insurance Management, LLC · CIK 0002078277 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 0

F4 · kind: These Class B Common Shares converted into Class A Common Shares on a 1-for-1 basis and then were sold pursuant to an underwriting agreement dated as of July 23, 2025, by and among the Issuer, the selling stockholders, and the underwriters named therein in connection with the Issuer's IPO.

F5 · ownership.nature: These securities are held directly by ACP Accelerant Investment Holding Company, Ltd. ACP Accelerant Holdings, L.P. is the sole owner of ACP Accelerant Investment Holding Company, Ltd. Each of (i) ACP Insurance Management, LLC, as the general partner of ACP Accelerant Holdings, L.P., and (ii) Mr. Schwartz, as the sole owner and managing member of ACP Insurance Management, LLC, may be deemed to have voting and dispositive power over these securities, but disclaim beneficial ownership over these securities except to the extent of their respective pecuniary interest therein, if any.

SEC source: 0000905148-25-002639 · form4.xml · nonDerivative · entry 3

Schwartz Keoni Andrew · CIK 0002009246 · Director · 10% owner

ACP Accelerant Holdings, L.P. · CIK 0002078270 · 10% owner

ACP Insurance Management, LLC · CIK 0002078277 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 2,670,456

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · kind: These Class B Common Shares converted into Class A Common Shares on a 1-for-1 basis and then were sold pursuant to an underwriting agreement dated as of July 23, 2025, by and among the Issuer, the selling stockholders, and the underwriters named therein in connection with the Issuer's IPO.

F4 · price: These Class B Common Shares converted into Class A Common Shares on a 1-for-1 basis and then were sold pursuant to an underwriting agreement dated as of July 23, 2025, by and among the Issuer, the selling stockholders, and the underwriters named therein in connection with the Issuer's IPO.

F5 · ownership.nature: These securities are held directly by ACP Accelerant Investment Holding Company, Ltd. ACP Accelerant Holdings, L.P. is the sole owner of ACP Accelerant Investment Holding Company, Ltd. Each of (i) ACP Insurance Management, LLC, as the general partner of ACP Accelerant Holdings, L.P., and (ii) Mr. Schwartz, as the sole owner and managing member of ACP Insurance Management, LLC, may be deemed to have voting and dispositive power over these securities, but disclaim beneficial ownership over these securities except to the extent of their respective pecuniary interest therein, if any.

SEC source: 0000905148-25-002639 · form4.xml · nonDerivative · entry 2

Schwartz Keoni Andrew · CIK 0002009246 · Director · 10% owner

ACP Accelerant Holdings, L.P. · CIK 0002078270 · 10% owner

ACP Insurance Management, LLC · CIK 0002078277 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 0

F4 · kind: These Class B Common Shares converted into Class A Common Shares on a 1-for-1 basis and then were sold pursuant to an underwriting agreement dated as of July 23, 2025, by and among the Issuer, the selling stockholders, and the underwriters named therein in connection with the Issuer's IPO.

F2 · ownership.nature: These securities are held directly by ACP Accelerant Holdings, L.P. Each of (i) ACP Insurance Management, LLC, as the general partner of ACP Accelerant Holdings, L.P., and (ii) Keoni Schwartz ("Mr. Schwartz"), as the sole owner and managing member of ACP Insurance Management, LLC, may be deemed to have voting and dispositive power over these securities, but disclaim beneficial ownership over these securities except to the extent of their respective pecuniary interest therein, if any.

SEC source: 0000905148-25-002639 · form4.xml · nonDerivative · entry 1

Schwartz Keoni Andrew · CIK 0002009246 · Director · 10% owner

ACP Accelerant Holdings, L.P. · CIK 0002078270 · 10% owner

ACP Insurance Management, LLC · CIK 0002078277 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 8,111,253

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · kind: These Class B Common Shares converted into Class A Common Shares on a 1-for-1 basis and then were sold pursuant to an underwriting agreement dated as of July 23, 2025, by and among the Issuer, the selling stockholders, and the underwriters named therein in connection with the Issuer's IPO.

F4 · price: These Class B Common Shares converted into Class A Common Shares on a 1-for-1 basis and then were sold pursuant to an underwriting agreement dated as of July 23, 2025, by and among the Issuer, the selling stockholders, and the underwriters named therein in connection with the Issuer's IPO.

F2 · ownership.nature: These securities are held directly by ACP Accelerant Holdings, L.P. Each of (i) ACP Insurance Management, LLC, as the general partner of ACP Accelerant Holdings, L.P., and (ii) Keoni Schwartz ("Mr. Schwartz"), as the sole owner and managing member of ACP Insurance Management, LLC, may be deemed to have voting and dispositive power over these securities, but disclaim beneficial ownership over these securities except to the extent of their respective pecuniary interest therein, if any.

SEC source: 0000905148-25-002640 · form4.xml · nonDerivative · entry 1

Sternberg Matthew David · CIK 0002008628 · COO, Risk Exchange

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 152,264

F1 · shares: Represents Restricted Stock Units ("RSUs"), each one of which represents the contingent right to receive one Class A Common Share.

F1 · balance_after: Represents Restricted Stock Units ("RSUs"), each one of which represents the contingent right to receive one Class A Common Share.

SEC source: 0000905148-25-002638 · form4.xml · derivative · entry 6

RADKE JEFFREY L · CIK 0001241965 · Director · Co-Founder, CEO · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · By Trust

Disclosed balance after: 0

Underlying: Class A Common Shares · 249,828 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the Issuer's initial public offering, these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F1 · derivative.exercise_date: In connection with the Issuer's initial public offering, these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F1 · derivative.expiration_date: In connection with the Issuer's initial public offering, these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F3 · ownership.nature: These securities are held in trust for the benefit of the Reporting Person's spousal equivalent, who is the trustee of the trust. The Reporting Person disclaims beneficial ownership over these securities, except to the extent of his pecuniary interest therein.

SEC source: 0000905148-25-002638 · form4.xml · derivative · entry 5

RADKE JEFFREY L · CIK 0001241965 · Director · Co-Founder, CEO · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · By LLC

Disclosed balance after: 0

Underlying: Class A Common Shares · 27,945,395 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the Issuer's initial public offering, these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F1 · derivative.exercise_date: In connection with the Issuer's initial public offering, these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F1 · derivative.expiration_date: In connection with the Issuer's initial public offering, these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F2 · ownership.nature: These securities are held directly by Badly Bent LLC. The Reporting Person is the manager of the sole member of Badly Bent LLC. The Reporting Person disclaims beneficial ownership over these securities, except to the extent of his pecuniary interest therein.

SEC source: 0000905148-25-002638 · form4.xml · derivative · entry 4

RADKE JEFFREY L · CIK 0001241965 · Director · Co-Founder, CEO · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Shares · 33,464 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the Issuer's initial public offering, these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F1 · derivative.exercise_date: In connection with the Issuer's initial public offering, these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F1 · derivative.expiration_date: In connection with the Issuer's initial public offering, these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

SEC source: 0000905148-25-002638 · form4.xml · nonDerivative · entry 3

RADKE JEFFREY L · CIK 0001241965 · Director · Co-Founder, CEO · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · By Trust

Disclosed balance after: 249,828

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: In connection with the Issuer's initial public offering, these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F3 · ownership.nature: These securities are held in trust for the benefit of the Reporting Person's spousal equivalent, who is the trustee of the trust. The Reporting Person disclaims beneficial ownership over these securities, except to the extent of his pecuniary interest therein.

SEC source: 0000905148-25-002638 · form4.xml · nonDerivative · entry 2

RADKE JEFFREY L · CIK 0001241965 · Director · Co-Founder, CEO · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · By LLC

Disclosed balance after: 27,945,395

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: In connection with the Issuer's initial public offering, these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F2 · ownership.nature: These securities are held directly by Badly Bent LLC. The Reporting Person is the manager of the sole member of Badly Bent LLC. The Reporting Person disclaims beneficial ownership over these securities, except to the extent of his pecuniary interest therein.

SEC source: 0000905148-25-002638 · form4.xml · nonDerivative · entry 1

RADKE JEFFREY L · CIK 0001241965 · Director · Co-Founder, CEO · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,464

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: In connection with the Issuer's initial public offering, these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

SEC source: 0000905148-25-002637 · form4.xml · derivative · entry 5

ONeill Francis James · CIK 0002008632 · Co-Founder, Chief U/W Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Shares · 22,190 shares

Expires not disclosed

F3 · derivative.exercise_price: In connection with the Issuer's IPO, these Redeemable Preference Shares were redeemed by the Issuer at a redemption price of $31.55 per share.

F3 · kind: In connection with the Issuer's IPO, these Redeemable Preference Shares were redeemed by the Issuer at a redemption price of $31.55 per share.

F3 · derivative.exercise_date: In connection with the Issuer's IPO, these Redeemable Preference Shares were redeemed by the Issuer at a redemption price of $31.55 per share.

F3 · derivative.expiration_date: In connection with the Issuer's IPO, these Redeemable Preference Shares were redeemed by the Issuer at a redemption price of $31.55 per share.

SEC source: 0000905148-25-002637 · form4.xml · derivative · entry 4

ONeill Francis James · CIK 0002008632 · Co-Founder, Chief U/W Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Shares · 7,975 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: In connection with the Issuer's IPO, these shares of the Issuer's Preference Shares automatically converted into Class A Common Shares of the Issuer at a 1-for-1 conversion rate.

F2 · derivative.exercise_date: In connection with the Issuer's IPO, these shares of the Issuer's Preference Shares automatically converted into Class A Common Shares of the Issuer at a 1-for-1 conversion rate.

F2 · derivative.expiration_date: In connection with the Issuer's IPO, these shares of the Issuer's Preference Shares automatically converted into Class A Common Shares of the Issuer at a 1-for-1 conversion rate.

SEC source: 0000905148-25-002637 · form4.xml · derivative · entry 3

ONeill Francis James · CIK 0002008632 · Co-Founder, Chief U/W Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Shares · 7,136,705 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F1 · derivative.exercise_date: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F1 · derivative.expiration_date: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

SEC source: 0000905148-25-002637 · form4.xml · nonDerivative · entry 2

ONeill Francis James · CIK 0002008632 · Co-Founder, Chief U/W Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,144,680

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · price: In connection with the Issuer's IPO, these shares of the Issuer's Preference Shares automatically converted into Class A Common Shares of the Issuer at a 1-for-1 conversion rate.

SEC source: 0000905148-25-002637 · form4.xml · nonDerivative · entry 1

ONeill Francis James · CIK 0002008632 · Co-Founder, Chief U/W Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,136,705

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

SEC source: 0000905148-25-002636 · form4.xml · nonDerivative · entry 1

Meriwether Karen Sue · CIK 0002009232 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,210

F1 · shares: Represents Restricted Stock Units ("RSUs"), each one of which represents the contingent right to receive one Class A Common Share.

F1 · balance_after: Represents Restricted Stock Units ("RSUs"), each one of which represents the contingent right to receive one Class A Common Share.

SEC source: 0000905148-25-002635 · form4.xml · nonDerivative · entry 1

Little Paul Christopher · CIK 0002009244 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,210

F1 · shares: Represents Restricted Stock Units ("RSUs"), each one of which represents the contingent right to receive one Class A Common Share.

F1 · balance_after: Represents Restricted Stock Units ("RSUs"), each one of which represents the contingent right to receive one Class A Common Share.

SEC source: 0000905148-25-002634 · form4.xml · derivative · entry 3

Lee-Smith Christopher · CIK 0002008627 · Director · Co-Founder, Head of Distrib.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Shares · 62,132 shares

Expires not disclosed

F2 · derivative.exercise_price: In connection with the Issuer's IPO, these Redeemable Preference Shares were redeemed by the Issuer at a redemption price of $31.55 per share.

F2 · kind: In connection with the Issuer's IPO, these Redeemable Preference Shares were redeemed by the Issuer at a redemption price of $31.55 per share.

F2 · derivative.exercise_date: In connection with the Issuer's IPO, these Redeemable Preference Shares were redeemed by the Issuer at a redemption price of $31.55 per share.

F2 · derivative.expiration_date: In connection with the Issuer's IPO, these Redeemable Preference Shares were redeemed by the Issuer at a redemption price of $31.55 per share.

SEC source: 0000905148-25-002634 · form4.xml · derivative · entry 2

Lee-Smith Christopher · CIK 0002008627 · Director · Co-Founder, Head of Distrib.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Shares · 17,509,884 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F1 · derivative.exercise_date: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F1 · derivative.expiration_date: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

SEC source: 0000905148-25-002634 · form4.xml · nonDerivative · entry 1

Lee-Smith Christopher · CIK 0002008627 · Director · Co-Founder, Head of Distrib.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,509,884

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

SEC source: 0000905148-25-002633 · form4.xml · derivative · entry 8

Hasley Nancy · CIK 0002012400 · Director · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Shares · 22,190 shares

Expires not disclosed

F4 · derivative.exercise_price: In connection with the Issuer's IPO, these Redeemable Preference Shares were redeemed by the Issuer at a redemption price of $31.55 per share.

F4 · kind: In connection with the Issuer's IPO, these Redeemable Preference Shares were redeemed by the Issuer at a redemption price of $31.55 per share.

F4 · derivative.exercise_date: In connection with the Issuer's IPO, these Redeemable Preference Shares were redeemed by the Issuer at a redemption price of $31.55 per share.

F4 · derivative.expiration_date: In connection with the Issuer's IPO, these Redeemable Preference Shares were redeemed by the Issuer at a redemption price of $31.55 per share.

SEC source: 0000905148-25-002633 · form4.xml · derivative · entry 7

Hasley Nancy · CIK 0002012400 · Director · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Shares · 17,025 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: In connection with the Issuer's IPO, these shares of the Issuer's Preference Shares automatically converted into Class A Common Shares of the Issuer at a 1-for-1 conversion rate.

F2 · derivative.exercise_date: In connection with the Issuer's IPO, these shares of the Issuer's Preference Shares automatically converted into Class A Common Shares of the Issuer at a 1-for-1 conversion rate.

F2 · derivative.expiration_date: In connection with the Issuer's IPO, these shares of the Issuer's Preference Shares automatically converted into Class A Common Shares of the Issuer at a 1-for-1 conversion rate.

SEC source: 0000905148-25-002633 · form4.xml · derivative · entry 6

Hasley Nancy · CIK 0002012400 · Director · General Counsel

10b5-1 filing: No plan indicated

Ownership: Indirect · By Trust

Disclosed balance after: 0

Underlying: Class A Common Shares · 512,531 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F1 · derivative.exercise_date: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F1 · derivative.expiration_date: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F5 · ownership.nature: These securities are held in an irrevocable trust over which the Reporting Person exercises investment discretion, and for which the Reporting Person's children are beneficiaries. The Reporting Person disclaims beneficial ownership over these securities, except to the extent of her pecuniary interest therein.

SEC source: 0000905148-25-002633 · form4.xml · derivative · entry 5

Hasley Nancy · CIK 0002012400 · Director · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Shares · 1,368,640 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F1 · derivative.exercise_date: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F1 · derivative.expiration_date: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

SEC source: 0000905148-25-002633 · form4.xml · nonDerivative · entry 4

Hasley Nancy · CIK 0002012400 · Director · General Counsel

10b5-1 filing: No plan indicated

Ownership: Indirect · By Spouse

Disclosed balance after: 500

F3 · kind: These Class A Common Shares were purchased by the Reporting Person's spouse through a directed share program in connection with the Issuer's IPO.

SEC source: 0000905148-25-002633 · form4.xml · nonDerivative · entry 3

Hasley Nancy · CIK 0002012400 · Director · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,385,665

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · price: In connection with the Issuer's IPO, these shares of the Issuer's Preference Shares automatically converted into Class A Common Shares of the Issuer at a 1-for-1 conversion rate.

SEC source: 0000905148-25-002633 · form4.xml · nonDerivative · entry 2

Hasley Nancy · CIK 0002012400 · Director · General Counsel

10b5-1 filing: No plan indicated

Ownership: Indirect · By Trust

Disclosed balance after: 512,531

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F5 · ownership.nature: These securities are held in an irrevocable trust over which the Reporting Person exercises investment discretion, and for which the Reporting Person's children are beneficiaries. The Reporting Person disclaims beneficial ownership over these securities, except to the extent of her pecuniary interest therein.

SEC source: 0000905148-25-002633 · form4.xml · nonDerivative · entry 1

Hasley Nancy · CIK 0002012400 · Director · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,368,640

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

SEC source: 0000905148-25-002632 · form4.xml · derivative · entry 5

Harrington Wendy Liisa · CIK 0002009240 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Shares · 6,297 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: In connection with the Issuer's IPO, these shares of the Issuer's Preference Shares automatically converted into Class A Common Shares of the Issuer at a 1-for-1 conversion rate.

F3 · derivative.exercise_date: In connection with the Issuer's IPO, these shares of the Issuer's Preference Shares automatically converted into Class A Common Shares of the Issuer at a 1-for-1 conversion rate.

F3 · derivative.expiration_date: In connection with the Issuer's IPO, these shares of the Issuer's Preference Shares automatically converted into Class A Common Shares of the Issuer at a 1-for-1 conversion rate.

SEC source: 0000905148-25-002632 · form4.xml · derivative · entry 4

Harrington Wendy Liisa · CIK 0002009240 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Shares · 7,808 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F2 · derivative.exercise_date: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

F2 · derivative.expiration_date: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

SEC source: 0000905148-25-002632 · form4.xml · nonDerivative · entry 3

Harrington Wendy Liisa · CIK 0002009240 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,315

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · price: In connection with the Issuer's IPO, these shares of the Issuer's Preference Shares automatically converted into Class A Common Shares of the Issuer at a 1-for-1 conversion rate.

SEC source: 0000905148-25-002632 · form4.xml · nonDerivative · entry 2

Harrington Wendy Liisa · CIK 0002009240 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,018

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · price: In connection with the Issuer's initial public offering ("IPO"), these limited partnership interests of Accelerant Holdings LP were exchanged for Class A Common Shares of the Issuer in proportion to the economic interests represented by the limited partnership interests.

SEC source: 0000905148-25-002632 · form4.xml · nonDerivative · entry 1

Harrington Wendy Liisa · CIK 0002009240 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,210

F1 · shares: Represents Restricted Stock Units ("RSUs"), each one of which represents the contingent right to receive one Class A Common Share.

F1 · balance_after: Represents Restricted Stock Units ("RSUs"), each one of which represents the contingent right to receive one Class A Common Share.

SEC source: 0000905148-25-002631 · form4.xml · derivative · entry 2

Green Jay Michael · CIK 0002008767 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Shares · 1,087,948 shares

Expires 2033-09-01

F4 · derivative.exercise_price: The Form 3 reflected an incorrect exercise price for this option of $19.30. The actual exercise price for this option is $19.31.

F2 · kind: In connection with the Issuer's initial public offering, the Reporting Person received RSUs in replacement of his existing stock options.

F2 · price: In connection with the Issuer's initial public offering, the Reporting Person received RSUs in replacement of his existing stock options.

F3 · derivative.exercise_date: Fifty percent (50%) of the Class A Common Shares subject to the option vested on each of the first two anniversaries of October 1, 2022, in each case subject to the Reporting Person's continuous employment.

SEC source: 0000905148-25-002631 · form4.xml · nonDerivative · entry 1

Green Jay Michael · CIK 0002008767 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,454,851

F1 · shares: Represents Restricted Stock Units ("RSUs"), each one of which represents the contingent right to receive one Class A Common Share.

F2 · price: In connection with the Issuer's initial public offering, the Reporting Person received RSUs in replacement of his existing stock options.

F1 · balance_after: Represents Restricted Stock Units ("RSUs"), each one of which represents the contingent right to receive one Class A Common Share.

SEC source: 0000905148-25-002561 · form4.xml · derivative · entry 1

RADKE JEFFREY L · CIK 0001241965 · Director · Co-Founder, CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,279,552

Underlying: Class A Common Shares · 8,279,552 shares

Expires 2035-07-23

F1 · derivative.exercise_date: Twenty-five percent (25%) of the Class A Common Shares subject to the option vest on July 23, 2026 (the one-year anniversary of the grant date), and the remaining Class A Common Shares subject to the option vest in 6.25% quarterly installments through July 23, 2029 (the four-year anniversary of the grant date), in each case subject to the Reporting Person's continuous service.

SEC source: 0000905148-25-002560 · form4.xml · derivative · entry 1

ONeill Francis James · CIK 0002008632 · Co-Founder, Chief U/W Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 882,611

Underlying: Class A Common Shares · 882,611 shares

Expires 2035-07-23

F1 · derivative.exercise_date: Twenty-five percent (25%) of the Class A Common Shares subject to the option vest on July 23, 2026 (the one-year anniversary of the grant date), and the remaining Class A Common Shares subject to the option vest in 6.25% quarterly installments through July 23, 2029 (the four-year anniversary of the grant date), in each case subject to the Reporting Person's continuous service.

SEC source: 0000905148-25-002559 · form4.xml · derivative · entry 1

Lee-Smith Christopher · CIK 0002008627 · Director · Co-Founder, Head of Distrib.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,746,261

Underlying: Class A Common Shares · 2,746,261 shares

Expires 2035-07-23

F1 · derivative.exercise_date: Twenty-five percent (25%) of the Class A Common Shares subject to the option vest on July 23, 2026 (the one-year anniversary of the grant date), and the remaining Class A Common Shares subject to the option vest in 6.25% quarterly installments through July 23, 2029 (the four-year anniversary of the grant date), in each case subject to the Reporting Person's continuous service.