[Form 4] Arch Capital Group Ltd Insider Trading Activity

Rhea-AI Filing Summary

Rajeh Maamoun, President and Director of Arch Capital Group Ltd. (ACGL), reported a sale of 10,000 common shares on 08/22/2025 at a weighted average price of $94.1464. After the transaction he beneficially owns 433,589 shares. The filing notes that the sale prices ranged from $94.07 to $94.19 and that 248 shares were added to his holdings on 05/31/2025 under the company Employee Share Purchase Plan. The Form 4 was signed on 08/25/2025.

Positive

• Continued substantial ownership: Retains 433,589 shares after the sale, indicating ongoing alignment with shareholders.
• Transparent pricing disclosure: Weighted average sale price and range ($94.07–$94.19) are disclosed, with offer to provide detailed breakdown upon request.

Negative

• Insider sale reported: Disposition of 10,000 shares on 08/22/2025 which reduces insider holdings.
• Limited context: Filing does not state whether sale was pursuant to a pre-arranged plan, so motive and broader trading program are not clarified.

Insights

Financial Analyst

TL;DR: Routine insider sale; holding remains large at 433,589 shares.

The reported sale of 10,000 shares at a weighted average of $94.1464 appears to be a routine disposition rather than an indicator of a change in control or a significant reduction in exposure. The filer retains a substantial position of 433,589 shares, and the filing discloses the weighted average sale price range ($94.07–$94.19) and a recent small ESPP acquisition of 248 shares on 05/31/2025. For investors, this is a standard Section 16 disclosure documenting an insider sale and continuing ownership.

Corporate Governance Expert

TL;DR: Disclosure meets Section 16 requirements; no governance red flags in this filing.

The Form 4 clearly identifies the reporting person as President and Director and reports the single non-derivative sale with pricing detail and post-transaction beneficial ownership. The explanation footnote appropriately notes the weighted average sale price and an ESPP purchase. There is no indication of atypical trading patterns, omissions, or corrective amendments in the provided content.

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).

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^*

Rajeh Maamoun

(Last) (First) (Middle)

C/O ARCH CAPITAL GROUP LTD

100 PITTS BAY ROAD, WATERLOO HOUSE

(Street)

PEMBROKE D0 HM 08

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
ARCH CAPITAL GROUP LTD. [ ACGL ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	PRESIDENT, ARCH CAPITAL GROUP

3. Date of Earliest Transaction (Month/Day/Year)
08/22/2025

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

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

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

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
Common Shares, $.0011 par value per share	08/22/2025		S		10,000	D	$94.1464(1)	433,589(2)	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 a weighted average sale price; the sales prices range from $94.07 to $94.19. Upon request, the full information regarding the number of shares sold at each separate price within the range will be provided to the issuer, any security holder of the issuer or the staff of the Securities Exchange Commission

2. Amount includes 248 common shares acquired on May 31, 2025 under the Arch Capital Group Ltd. Employee Share Purchase Plan.

	/s/ Maamoun Rajeh	08/25/2025
	** 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.

FAQ

What transaction did ACGL insider Rajeh Maamoun report on Form 4?

The filing reports a sale of 10,000 common shares on 08/22/2025 at a weighted average price of $94.1464.

How many ACGL shares does Rajeh Maamoun own after the reported sale?

After the sale, he beneficially owns 433,589 shares according to the Form 4.

Did the filing disclose purchases as well as sales for Rajeh Maamoun?

The Form 4 notes a prior acquisition of 248 shares on 05/31/2025 under the company Employee Share Purchase Plan.

What price range was disclosed for the sold ACGL shares?

The filing states the sale prices ranged from $94.07 to $94.19 and gives a weighted average of $94.1464.

When was the Form 4 signed by the reporting person?

The Form 4 bears the reporting person's signature dated 08/25/2025.