Arch Capital (NASDAQ: ACGL) officer logs tax-withholding share disposition

Rhea-AI Filing Summary

ARCH CAPITAL GROUP LTD. officer of a subsidiary, Louis T. Petrillo, reported a tax-withholding disposition of 312 common shares on February 27, 2026 at $100.15 per share. After this, he directly held 156,631 common shares and indirectly held 100 shares attributed to step sons in 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

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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)
02/27/2026

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	02/27/2026		F		312	D	$100.15	156,631	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

Explanation of Responses:

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

Remarks:

	/s/ Louis Petrillo	03/02/2026
	** 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 transaction did ACGL officer Louis T. Petrillo report?

Louis T. Petrillo reported a tax-withholding disposition of 312 Arch Capital common shares. The transaction occurred on February 27, 2026, and used shares to satisfy an exercise price or tax liability instead of an open-market sale.

At what price were the ACGL shares used for Petrillo’s tax withholding?

The shares used for Louis T. Petrillo’s tax-withholding disposition were valued at $100.15 per Arch Capital common share. This per-share price comes directly from the reported transaction details in the insider filing for February 27, 2026.

How many Arch Capital shares does Louis T. Petrillo hold after the transaction?

After the reported tax-withholding disposition, Louis T. Petrillo directly held 156,631 Arch Capital common shares. The filing also shows an additional 100 common shares held indirectly, attributed to step sons who share his household.

What does the tax-withholding disposition code F mean in the ACGL filing?

Code F indicates a tax-withholding disposition, where shares are delivered to cover an exercise price or tax liability. It differs from an open-market sale, as the transaction is for tax or exercise settlement rather than discretionary selling.

How are the indirectly held ACGL shares by Petrillo classified?

The filing classifies 100 Arch Capital common shares as indirectly owned by Louis T. Petrillo, with ownership described as “By Household.” A footnote explains these shares are owned by his step sons, who share his household.

Does the ACGL Form 4 show any open-market buying or selling by Petrillo?

The Form 4 does not show open-market buying or selling by Louis T. Petrillo. It reports a tax-withholding disposition under code F and a separate indirect household holding, rather than discretionary market purchases or sales.