Arch Capital director sells 3,000 depositary shares

Arch Capital Group Ltd. director Brian S. Posner reported an open-market sale of 3,000 Depositary Shares, Series G, on March 11, 2026, at a weighted average price of $17.115 per share.

Rhea-AI Filing Summary

Arch Capital Group Ltd. director Brian S. Posner reported an open-market sale of 3,000 Depositary Shares, Series G, on March 11, 2026, at a weighted average price of $17.115 per share. Each Depositary Share represents a 1/1,000th interest in a Series G Non-Cumulative Preferred Share.

After the sale, Posner directly holds 2,000 Depositary Shares, Series G, 3,000 Depositary Shares, Series F (each representing a 1/1,000th interest in a Series F Non-Cumulative Preferred Share), and 120,104 Common Shares.

Insider Trade Summary

Net Seller: 3,000 shares

Net Sell 3 txns

Insider Posner Brian S

Role Director

Sold 3,000 shs ($51K)

Type	Security	Shares	Price	Value
Sale	Depositary Shares, Series G	3,000	$17.115	$51K
holding	Common Shares, $.0011 par value per share	--	--	--
holding	Depositary Shares, Series F	--	--	--

Holdings After Transaction: Depositary Shares, Series G — 2,000 shares (Direct); Common Shares, $.0011 par value per share — 120,104 shares (Direct); Depositary Shares, Series F — 3,000 shares (Direct)

Footnotes (3)

1. F1. Each Depositary Share Represents 1/1,000th interest in a Series G Non-Cumulative Preferred Share.
2. F2. The price reported is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $17.1149 to $17.1150. 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.
3. F3. Each Depositary Share Represents 1/1,000th interest in a Series F Non-Cumulative Preferred Share.

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Accepted by SEC EDGAR 03/12/2026 - 04:29 PM EDT Learn about SEC filing dates

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^*

Posner Brian S

(Last) (First) (Middle)

WATERLOO HOUSE, GROUND FLOOR

100 PITTS BAY ROAD

(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)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
03/11/2026

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
Depositary Shares, Series G(1)	03/11/2026		S		3,000	D	$17.115(2)	2,000	D
Common Shares, $.0011 par value per share								120,104	D
Depositary Shares, Series F(3)								3,000	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. Each Depositary Share Represents 1/1,000th interest in a Series G Non-Cumulative Preferred Share.

2. The price reported is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $17.1149 to $17.1150. 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.

3. Each Depositary Share Represents 1/1,000th interest in a Series F Non-Cumulative Preferred Share.

Remarks:

	/s/ Brian S. Posner	03/12/2026
	** 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.