Accelerant (ARX) co-founder awarded 128,644 restricted stock units

Rhea-AI Filing Summary

ONeill Francis James reported acquisition or exercise transactions in this Form 4 filing.

Accelerant Holdings reported that co-founder and Chief Underwriting Officer Francis James O’Neill received an award of 128,644 Class A Common Share restricted stock units on March 18, 2026, as equity compensation. The units carry no purchase price and increase his direct holdings to 7,363,769 shares after the grant.

The award vests over time. According to the terms, 25% of the restricted stock units vest on the one-year anniversary of the March 18, 2026 grant date, with an additional 6.25% vesting on the first day of each of the twelve calendar quarters that follow that anniversary. This creates a four-year vesting schedule tied to his ongoing service.

SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

ONeill Francis James

(Last) (First) (Middle)

UNIT 106, WINDWARD 3

REGATTA OFFICE PARK, WEST BAY ROAD

(Street)

GRAND CAYMAN KY1-1108

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/18/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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	03/18/2026		A		128,644(1)	A	$0	7,363,769	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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (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: 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

Explanation of Responses:

1. Represents an award of Restricted Stock Units granted on March 18, 2026. The RSUs are scheduled to vest as to twenty-five percent (25%) of the RSUs on the one-year anniversary of the Grant Date and as to six and one-quarter percent (6-1/4%) of the RSUs on the first day of each of the twelve (12) calendar quarters beginning after such anniversary.

Remarks:

	/s/ David Pelsue, Attorney-in-Fact	03/20/2026
	** Signature of Reporting Person	Date
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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Accelerant Holdings (ARX) disclose for Francis James O’Neill?

Accelerant Holdings disclosed that co-founder and Chief Underwriting Officer Francis James O’Neill received a grant of 128,644 Class A Common Share restricted stock units on March 18, 2026, as equity compensation, with no cash paid per share for this award.

How many shares does Francis James O’Neill hold after this Form 4 transaction at Accelerant (ARX)?

After receiving 128,644 restricted stock units, Francis James O’Neill’s direct holdings increased to 7,363,769 Class A Common Shares. This total reflects his position immediately following the grant reported in the Form 4 insider transaction filing.

Is the Accelerant (ARX) Form 4 transaction a market purchase or sale of shares?

The Form 4 transaction is not a market purchase or sale. It represents a grant of restricted stock units at a price of $0.0000 per share, indicating stock-based compensation rather than an open-market trade involving cash consideration.

What is the vesting schedule for Francis O’Neill’s 128,644 RSUs at Accelerant (ARX)?

The 128,644 restricted stock units vest 25% on the one-year anniversary of the March 18, 2026 grant date. The remaining units vest 6.25% on the first day of each of twelve calendar quarters that begin after that anniversary date.

What role does Francis James O’Neill hold at Accelerant Holdings (ARX) in this Form 4?

In this Form 4, Francis James O’Neill is identified as Co-Founder and Chief Underwriting Officer of Accelerant Holdings. The restricted stock unit grant aligns his compensation more closely with shareholder interests through additional equity exposure in the company.