Director at Arch Capital (ACGL) awarded 2,071 restricted shares

Rhea-AI Filing Summary

Posner Brian S reported acquisition or exercise transactions in this Form 4 filing.

Arch Capital Group Ltd. director Brian S. Posner received a grant of 2,071 restricted common shares. The award carried a price of $0.00 per share, indicating it was compensation rather than an open-market purchase.

According to the grant terms, these restricted shares will vest on the earlier of one year after the grant date or Arch Capital Group Ltd.'s next Annual General Meeting of Shareholders. Following this award, Posner directly owns 122,175 common shares of the company.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Posner Brian S

Role null

Type	Security	Shares	Price	Value
Grant/Award	Common Shares, $.0011 par value per share	2,071	$0.00	--

Holdings After Transaction: Common Shares, $.0011 par value per share — 122,175 shares (Direct, null)

Footnotes (1)

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Key Figures

Restricted share grant: 2,071 shares Grant price: $0.00 per share Shares owned after grant: 122,175 shares

3 metrics

Restricted share grant 2,071 shares Equity award to director Brian S. Posner

Grant price $0.00 per share Compensation grant, not open-market purchase

Shares owned after grant 122,175 shares Direct common share holdings after transaction

Key Terms

restricted shares, grant date, Annual General Meeting of Shareholders

3 terms

restricted shares financial

"represents restricted shares that will become vested on the date that is the earlier"

Restricted shares are company stock that cannot be sold or transferred immediately because they are subject to legal or contractual limits, such as a required holding period or performance conditions. They matter to investors because these locked-up shares can affect a company’s available stock for trading, future dilution, and insider incentives—imagine a gift that can’t be cashed until certain conditions are met, which changes when and how much supply can suddenly enter the market.

grant date financial

"vested on the date that is the earlier of 1) one year following the grant date"

The grant date is the day a company formally gives an employee or contractor the right to receive stock-based compensation, such as stock options or restricted shares. It matters to investors because it fixes key terms—like the price, the start of the ownership clock, and when the award will affect the company’s financial statements and share count—so it can influence dilution, reported expenses, and potential future selling pressure.

Annual General Meeting of Shareholders financial

"or 2) Arch Capital Group Ltd.'s next Annual General Meeting of Shareholders"

Form 4 Insider Transactions: What Each Field Means →

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 HM 08

(City) (State) (Zip)

BERMUDA

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/05/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	05/05/2026		A		2,071	A	(1)	122,175	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. Subject to the terms of the restricted share agreement, represents restricted shares that will become vested on the date that is the earlier of 1) one year following the grant date or 2) Arch Capital Group Ltd.'s next Annual General Meeting of Shareholders.

Remarks:

	/s/ Brian S. Posner	05/07/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Brian S. Posner report at ACGL?

Brian S. Posner reported receiving a grant of 2,071 restricted common shares of Arch Capital Group Ltd. This was a compensation-related award at no purchase price, increasing his direct ownership to 122,175 common shares after the transaction.

How many Arch Capital (ACGL) shares were granted to Brian S. Posner?

Brian S. Posner was granted 2,071 restricted common shares of Arch Capital Group Ltd. These shares were awarded at a reported price of $0.00 per share, reflecting an equity compensation grant rather than a market purchase of stock.

What are the vesting terms of Brian S. Posner’s restricted shares in ACGL?

The 2,071 restricted shares granted to Brian S. Posner will vest on the earlier of one year after the grant date or Arch Capital Group Ltd.'s next Annual General Meeting of Shareholders, aligning the award’s timing with the company’s governance calendar.

Is Brian S. Posner’s ACGL share grant an open-market stock purchase?

No, Brian S. Posner’s transaction is a grant of 2,071 restricted common shares at $0.00 per share. It represents equity compensation rather than an open-market stock purchase, and therefore does not reflect a discretionary buy in the public market.

How many Arch Capital (ACGL) shares does Brian S. Posner own after this grant?

After receiving the grant of 2,071 restricted shares, Brian S. Posner directly owns 122,175 common shares of Arch Capital Group Ltd. This total includes the newly awarded restricted shares, subject to their vesting conditions described in the grant terms.