Accelerant Holdings (NYSE: ARX) co-founder sells 215,114 shares via 10b5-1 plan

Rhea-AI Filing Summary

Accelerant Holdings Co-Founder and Chief U/W Officer Francis James O’Neill, through Famed Ventures Limited, sold a total of 215,114 Class A Common Shares on July 27–28, 2026 at weighted average prices of $14.6308 and $14.5580 per share under a Rule 10b5-1 trading plan adopted on March 23, 2026. He continues to hold 166,644 Class A Common Shares directly as of July 27, 2026.

Insider Trade Summary 10b5-1

Net Seller: 215,114 shares

Net Sell 3 txns

Insider ONeill Francis James

Role Co-Founder, Chief U/W Officer

Sold 215,114 shs ($3.14M)

Type	Security	Shares	Price	Value
Sale	Class A Common Shares F1, F3	104,647	$14.558	$1.52M
Sale	Class A Common Shares F1, F2	110,467	$14.6308	$1.62M
holding	Class A Common Shares	--	--	--

Holdings After Transaction: Class A Common Shares — 6,522,125 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 $14.38 to $14.83, 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 $14.15 to $14.95, 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

Total shares sold: 215,114 Class A Common Shares Shares sold on 2026-07-27: 110,467 Class A Common Shares Shares sold on 2026-07-28: 104,647 Class A Common Shares +4 more

7 metrics

Total shares sold 215,114 Class A Common Shares Two indirect sales by Famed Ventures Limited on 2026-07-27 and 2026-07-28

Shares sold on 2026-07-27 110,467 Class A Common Shares Open-market or private sale by Famed Ventures Limited at weighted average price $14.6308

Shares sold on 2026-07-28 104,647 Class A Common Shares Open-market or private sale by Famed Ventures Limited at weighted average price $14.5580

Price range 2026-07-27 $14.38–$14.83 per share Footnote describes multiple transactions contributing to weighted average $14.6308

Price range 2026-07-28 $14.15–$14.95 per share Footnote describes multiple transactions contributing to weighted average $14.5580

Direct holdings after transactions 166,644 Class A Common Shares Directly held by Francis James O’Neill as of 2026-07-27

Rule 10b5-1 plan adoption date March 23, 2026 Date reporting person adopted the trading plan used for these sales

Key Terms

Rule 10b5-1 trading plan, weighted average price, open market or private transaction, Class A Common Shares

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 adopted..."

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 in multiple transactions..."

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.

open market or private transaction financial

"transaction_code_description: Sale in open market or private transaction"

Class A Common Shares financial

"security_title: Class A Common Shares"

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).

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 07/29/2026 - 06:26 PM Accepted by SEC EDGAR 07/29/2026 - 06:25 PM Learn about SEC filing dates

FAQ

What insider share sales did Accelerant Holdings (ARX) report for Francis James O’Neill?

Accelerant Holdings reported that Co-Founder Francis James O’Neill, via Famed Ventures Limited, sold 215,114 Class A Common Shares on July 27–28, 2026. The sales were executed as two open-market or private transactions disclosed in this Form 4 filing.

At what prices were the ARX insider sales by Famed Ventures Limited executed?

The reported weighted average sale prices were $14.6308 per share for 110,467 shares sold on July 27, 2026 and $14.5580 per share for 104,647 shares sold on July 28, 2026, with individual trades spanning specified price ranges.

Were the Accelerant Holdings (ARX) insider sales made under a Rule 10b5-1 plan?

Yes. The filing states the sales were effected under a Rule 10b5-1 trading plan adopted by the reporting person on March 23, 2026. Such pre-arranged plans can make the timing of trades less informative about short-term views.

How many Accelerant Holdings (ARX) shares does Francis James O’Neill still hold directly?

After the reported transactions, Francis James O’Neill is shown as holding 166,644 Class A Common Shares directly as of July 27, 2026. This holding entry is separate from the indirect shares sold by Famed Ventures Limited.

Who actually sold the Accelerant Holdings (ARX) shares reported in this Form 4?

The shares were sold indirectly by Famed Ventures Limited, identified as the nature of ownership for the transactions. Famed Ventures Limited sold 110,467 shares on July 27, 2026 and 104,647 shares on July 28, 2026, totaling 215,114 shares.

What total volume of Accelerant Holdings (ARX) shares was sold in these insider transactions?

Across the two reported sales, Famed Ventures Limited disposed of 215,114 Class A Common Shares. This comprises 110,467 shares sold on July 27, 2026 and 104,647 shares sold on July 28, 2026, according to the Form 4 transaction summary.

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)
07/27/2026

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	07/27/2026		S		110,467(1)	D	$14.6308(2)	6,626,772	I	By Famed Ventures Limited
Class A Common Shares	07/28/2026		S		104,647(1)	D	$14.558(3)	6,522,125	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 $14.38 to $14.83, 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 $14.15 to $14.95, 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	07/29/2026
	** 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)