Sec Form 4 Filing - ONeill Francis James @ Accelerant Holdings - 2025-07-25

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person ONeill Francis James 2. Issuer Name and Ticker or Trading Symbol Accelerant Holdings [ ARX] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Co-Founder, Chief U/W Officer (Last) (First) (Middle) UNIT 106, WINDWARD 3, REGATTA OFFICE PARK, WEST BAY ROAD 3. Date of Earliest Transaction (MM/DD/YY) 07/25/2025 (Street) GRAND CAYMAN, E9KY1-1108 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class A Common Shares 07/25/2025 C 7,136,705 A 7,136,705 D Class A Common Shares 07/25/2025 C 7,975 A 7,144,680 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares LP Interests of Accelerant Holdings LP ( 1 ) 07/25/2025 C 163,616,981 ( 1 ) ( 1 ) Class A Common Shares 7,136,705 $ 0 0 D Convertible Preference Shares ( 2 ) 07/25/2025 C 7,975 ( 2 ) ( 2 ) Class A Common Shares 7,975 $ 0 0 D Redeemable Preference Shares ( 3 ) 07/25/2025 D( 3 ) 22,190 ( 3 ) ( 3 ) Common Shares 22,190 $ 31.55 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other ONeill Francis James UNIT 106, WINDWARD 3 REGATTA OFFICE PARK, WEST BAY ROAD GRAND CAYMAN, E9KY1-1108 Co-Founder, Chief U/W Officer Signatures /s/ Robert Hardy, Attorney-in-Fact 07/29/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )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. ( 2 )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. ( 3 )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.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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