Arch Capital Group (ACGL) officer granted 10,331 options, 8,030 shares withheld for taxes

Rhea-AI Filing Summary

ARCH CAPITAL GROUP LTD. officer of subsidiary Louis T. Petrillo reported multiple equity transactions. On March 3, 2026, he acquired 2,889 Common Shares, $.0011 par value per share, as a grant/award, bringing his directly held common shares to 159,520.

On the same date he received a grant of 10,331 Stock Options (Right to Buy), with 10,331 options outstanding after the grant. According to a footnote, this stock option becomes exercisable in three equal annual installments beginning March 3, 2027, with the next two installments on March 3, 2028 and March 3, 2029, subject to the applicable award agreement.

On March 4, 2026, 8,030 Common Shares were disposed of in a tax-withholding disposition at a price of $98.4200 per share, reducing his directly held common shares to 151,490. Separately, 100 Common Shares are reported as held indirectly "By Household" by his step sons, who share his household.

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
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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^*

PETRILLO LOUIS T

(Last) (First) (Middle)

ARCH CAPITAL SERVICES LLC

360 HAMILTON AVENUE, SUITE 600

(Street)

WHITE PLAINS NY 10601

(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)
	Officer of Subsidiary

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

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
Common Shares, $.0011 par value per share	03/03/2026		A		2,889	A	$0	159,520	D
Common Shares, $.0011 par value per share	03/04/2026		F		8,030	D	$98.42	151,490	D
Common Shares, $.0011 par value per share								100	I	By Household(1)

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
Stock Option (Right to Buy)	$100.48	03/03/2026		A		10,331		(2)	03/03/2036	Common Shares, $.0011 par value per share	10,331	$0	10,331	D

Explanation of Responses:

1. These shares are owned by the reporting person's step sons, who share the reporting person's household.

2. 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.

Remarks:

	/s/ Louis Petrillo	03/05/2026
	** 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.

FAQ

What insider transactions did ACGL officer Louis T. Petrillo report?

Louis T. Petrillo reported equity grants and a tax-related share disposition. He received 2,889 Common Shares and 10,331 Stock Options as awards, and 8,030 Common Shares were used in a tax-withholding disposition at $98.4200 per share.

How many Arch Capital Group (ACGL) shares does Louis T. Petrillo hold after these transactions?

After the reported transactions, Louis T. Petrillo directly holds 151,490 Common Shares, $.0011 par value per share, and indirectly reports 100 Common Shares held "By Household" through his step sons, who share his household, as of the stated transaction dates.

What stock option grant did ACGL’s Louis T. Petrillo receive in this Form 4?

He received a grant of 10,331 Stock Options (Right to Buy), with 10,331 options outstanding after the grant. A footnote states the option vests in three equal annual installments starting March 3, 2027, then on March 3, 2028 and March 3, 2029.

When do Louis T. Petrillo’s newly granted ACGL stock options become exercisable?

The stock option becomes exercisable in three equal annual installments. Vesting starts on March 3, 2027, with additional installments on March 3, 2028 and March 3, 2029, all subject to the applicable award agreement described in the filing footnote.

What was the nature of the 8,030 ACGL shares disposed of by Louis T. Petrillo?

The 8,030 Common Shares were disposed of as a tax-withholding disposition, not an open-market sale. They were used for payment of exercise price or tax liability at $98.4200 per share, as indicated by transaction code F and its description.

How many Arch Capital Group shares does Louis T. Petrillo report as indirectly owned?

He reports 100 Common Shares as indirectly owned "By Household." A footnote explains these shares are owned by his step sons, who share his household, and are therefore reported as indirect beneficial ownership in the Form 4.