Petrillo Louis T. - 03 Mar 2026 Form 4 Insider Report for ARCH CAPITAL GROUP LTD. (ACGL)

Role: Officer of Subsidiary
Signature: /s/ Louis Petrillo
Issuer symbol: ACGL
Transactions as of: 03 Mar 2026
Net transactions value: $0
Form type: 4
Filing time: 05 Mar 2026, 16:19:04 UTC
Previous filing: 02 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
PETRILLO LOUIS T	Officer of Subsidiary	ARCH CAPITAL SERVICES LLC, 360 HAMILTON AVENUE, SUITE 600, WHITE PLAINS	/s/ Louis Petrillo	05 Mar 2026	0001227095

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ACGL	Common Shares, $.0011 par value per share	Award		+2,889	+1.8%	$0.000000^*	159,520	03 Mar 2026	Direct
transaction	ACGL	Common Shares, $.0011 par value per share	Tax liability		-8,030	-5%	$98.42^*	151,490	04 Mar 2026	Direct
holding	ACGL	Common Shares, $.0011 par value per share						100	03 Mar 2026	By Household	F1

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	ACGL	Stock Option (Right to Buy)	Award		+10,331		$0.000000^*	10,331	03 Mar 2026	Common Shares, $.0011 par value per share	10,331	$100.48	Direct	F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	These shares are owned by the reporting person's step sons, who share the reporting person's household.
F2	This stock option is exercisable in three equal annual installments commencing March 3, 2027, and the next two installments on March 3, 2028 and March 3, 2029, subject to the applicable award agreement.