Accelerant Holdings (ARX) co-founder reports 152,835-share Rule 10b5-1 stock sale

Rhea-AI Filing Summary

Accelerant Holdings officer Francis James O’Neill, Co-Founder and Chief U/W Officer, reported two indirect sales of Class A Common Shares held by Famed Ventures Limited. On August 10, 2026, 63,616 shares were sold at a weighted average of $12.0672 (range $11.89–$12.3450), and on August 11, 2026, 89,219 shares were sold at a weighted average of $12.4101 (range $12.055–$12.570). In total, 152,835 shares were sold under a Rule 10b5-1 trading plan adopted on March 23, 2026. O’Neill also reports 166,644 Class A Common Shares held directly after these transactions.

Insider Trade Summary 10b5-1

Net Seller: 152,835 shares

Net Sell 3 txns

Insider ONeill Francis James

Role Co-Founder, Chief U/W Officer

Sold 152,835 shs ($1.87M)

Type	Security	Shares	Price	Value
Sale	Class A Common Shares F1, F3	89,219	$12.4101	$1.11M
Sale	Class A Common Shares F1, F2	63,616	$12.0672	$768K
holding	Class A Common Shares	--	--	--

Holdings After Transaction: Class A Common Shares — 6,369,290 shares (Indirect, By Famed Ventures Limited); Class A Common Shares — 166,644 shares (Direct)

Footnotes (3)

1. F1. The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 23, 2026.
2. F2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $11.89 to $12.3450, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.
3. F3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $12.055 to $12.570, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Key Figures

Shares sold August 10, 2026: 63,616 Class A Common Shares Shares sold August 11, 2026: 89,219 Class A Common Shares Total shares sold: 152,835 Class A Common Shares +3 more

6 metrics

Shares sold August 10, 2026 63,616 Class A Common Shares Indirect sale by Famed Ventures Limited at $12.0672 weighted average price

Shares sold August 11, 2026 89,219 Class A Common Shares Indirect sale by Famed Ventures Limited at $12.4101 weighted average price

Total shares sold 152,835 Class A Common Shares Aggregate of reported indirect sales, net-sell direction

Direct holdings after transaction 166,644 Class A Common Shares Directly held by Francis James O’Neill after reported sales

Price range August 10 trades $11.89–$12.3450 per share Multiple trades; weighted average price $12.0672

Price range August 11 trades $12.055–$12.570 per share Multiple trades; weighted average price $12.4101

Key Terms

Rule 10b5-1 trading plan, weighted average price, Class A Common Shares, indirect ownership

4 terms

Rule 10b5-1 trading plan regulatory

"The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

weighted average price financial

"The price reported in Column 4 is a weighted average price. These shares were sold"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

Class A Common Shares financial

"security_title: Class A Common Shares, transaction_date: 2026-08-11"

A Class A common share is a specific type of ordinary company share that represents an ownership stake and usually carries particular voting rights or payout priorities compared with other share classes. For investors it matters because those differences affect how much influence you have over company decisions, how dividends or liquidation proceeds might be distributed, and how easily the shares trade — like choosing between car models where one has extra features (more control) and another focuses on price or availability (liquidity).

indirect ownership financial

"direct_or_indirect: I, ownership_type: indirect, nature_of_ownership: By Famed Ventures Limited"

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/12/2026 - 04:32 PM Accepted by SEC EDGAR 08/12/2026 - 04:31 PM Learn about SEC filing dates

FAQ

What insider transactions did ARX’s Francis James O’Neill report?

Francis James O’Neill reported two indirect sales of Accelerant Holdings Class A Common Shares totaling 152,835 shares on August 10–11, 2026, executed through Famed Ventures Limited at weighted average prices around $12 per share.

How many ARX shares did Famed Ventures Limited sell in this Form 4?

Entities associated with O’Neill, through Famed Ventures Limited, sold an aggregate of 152,835 Class A Common Shares of Accelerant Holdings in two transactions on August 10 and 11, 2026 under a pre-arranged Rule 10b5-1 trading plan.

At what prices were the ARX shares sold in O’Neill’s Form 4?

The reported weighted average prices were $12.0672 on August 10, 2026 and $12.4101 on August 11, 2026. Footnotes state the actual sale prices ranged from $11.89–$12.3450 and $12.055–$12.570, respectively, across multiple trade executions.

Were O’Neill’s ARX share sales made under a Rule 10b5-1 plan?

Yes. The Form 4 states the sales were effected under a Rule 10b5-1 trading plan adopted by the reporting person on March 23, 2026. Such plans pre-arrange trades, reducing the informational value of the exact timing of these sales.

How many ARX shares does O’Neill hold directly after these transactions?

After the reported transactions, Francis James O’Neill reports 166,644 Class A Common Shares held directly. The Form 4 does not specify remaining indirect holdings for Famed Ventures Limited but clearly discloses this direct post-transaction position.

Are the ARX share sales attributed directly to O’Neill or to an entity?

The sales are reported as indirect ownership transactions, with the shares held and sold by Famed Ventures Limited. O’Neill files as the reporting person, but the Form 4 specifies this entity as the holder of the sold shares.

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

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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

X

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)

CAYMAN ISLANDS

(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)
08/10/2026

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	08/10/2026		S		63,616(1)	D	$12.0672(2)	6,458,509	I	By Famed Ventures Limited
Class A Common Shares	08/11/2026		S		89,219(1)	D	$12.4101(3)	6,369,290	I	By Famed Ventures Limited
Class A Common Shares								166,644	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. The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 23, 2026.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $11.89 to $12.3450, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $12.055 to $12.570, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Remarks:

	/s/ Robert L. Villasenor, attorney-in-fact for Francis James O'Neill	08/12/2026
	** 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)