What does the 412-share tax-withholding disposition mean in the ACGL Form 4?

The 412-share tax-withholding disposition represents shares delivered to cover tax liabilities on the equity award. Labeled with transaction code F, it indicates payment of tax obligations using shares, rather than a discretionary open-market sale by the officer.

Arch Capital officer granted 17,136 shares

ARCH CAPITAL GROUP LTD. officer of a subsidiary Louis T. Petrillo reported mixed equity movements in company common shares.

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Form Type

Rhea-AI Filing Summary

ARCH CAPITAL GROUP LTD. officer of a subsidiary Louis T. Petrillo reported mixed equity movements in company common shares. On 2026-02-24, he received a grant of 17,136 common shares at $0.0000 per share, increasing his direct holdings to 156,943 shares.

On the same date, 412 shares were disposed of at $99.18 per share as a tax-withholding disposition, a transaction used to cover tax liabilities rather than an open-market sale. Separately, 100 shares are reported as indirectly owned by his household and are held by his step sons.

Insider Trade Summary

3 transactions reported

Mixed 3 txns

Insider PETRILLO LOUIS T

Role Officer of Subsidiary

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Shares, $.0011 par value per share	412	$99.18	$41K
Grant/Award	Common Shares, $.0011 par value per share	17,136	$0.00	$0.00
holding	Common Shares, $.0011 par value per share	--	--	--

Holdings After Transaction: Common Shares, $.0011 par value per share — 156,943 shares (Direct); Common Shares, $.0011 par value per share — 100 shares (Indirect, By Household)

Footnotes (2)

F1. Amount includes 248 Common Shares acquired on May 30, 2025 under the Arch Capital Group Ltd. Employee Share Purchase Plan.
F2. These shares are owned by the reporting person's step sons, who share the reporting person's household.

FAQ

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What insider activity did Louis T. Petrillo report for ARCH CAPITAL GROUP LTD. (ACGL)?

Louis T. Petrillo reported a grant of common shares and a related tax-withholding disposition. He received 17,136 common shares and 412 shares were withheld and disposed of to satisfy tax obligations linked to the equity award.

How many ARCH CAPITAL GROUP LTD. (ACGL) shares were granted to the officer?

He was granted 17,136 common shares at a stated price of $0.0000 per share. This grant increased his directly held position and reflects an equity award, not an open-market purchase of ARCH CAPITAL GROUP LTD. stock.

How many ARCH CAPITAL GROUP LTD. shares does Louis T. Petrillo hold after these transactions?

After the reported transactions, he directly holds 156,943 common shares. An additional 100 common shares are reported as indirectly owned by his household, held by his step sons who share his household, according to the filing footnotes.

What indirect ARCH CAPITAL GROUP LTD. (ACGL) holdings are reported for Louis T. Petrillo?

The filing reports 100 common shares as indirectly owned "By Household." Footnotes state these shares are owned by his step sons, who share his household, indicating the holdings are associated with household members rather than solely the officer.

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Accepted by SEC EDGAR 02/26/2026 - 04:18 PM EST

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^*

PETRILLO LOUIS T

(Last)

(First)

(Middle)

ARCH CAPITAL SERVICES LLC

360 HAMILTON AVENUE, SUITE 600

(Street)

WHITE PLAINS

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)
02/24/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Shares, $.0011 par value per share	02/24/2026		F		412	D	$99.18	139,807⁽¹⁾	D
Common Shares, $.0011 par value per share	02/24/2026		A		17,136	A	$0	156,943	D
Common Shares, $.0011 par value per share								100	I	By Household⁽²⁾

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. Amount includes 248 Common Shares acquired on May 30, 2025 under the Arch Capital Group Ltd. Employee Share Purchase Plan.

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

Remarks:

	/s/ Louis Petrillo	02/26/2026
	** 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.

Source: View Original Filing on SEC EDGAR