SEC FORM 3

SEC FORM 3SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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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1. Name and Address of Reporting Person^*

Schmeiser Robert Michael

(Last)

(First)

(Middle)

WATERLOO HOUSE, GROUND FLOOR

100 PITTS BAY ROAD

(Street)

PEMBROKE

HM 08

(City)

(State)

(Zip)

BERMUDA

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
09/03/2026

3. Issuer Name and Ticker or Trading Symbol
ARCH CAPITAL GROUP LTD. [ ACGL ]

3a. Foreign Trading Symbol

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

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	CEO, Arch Global Mortgage Grp.

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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Shares, $.0011 par value per share	44,856	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
Stock Option (Right to Buy)	⁽¹⁾	02/27/2030	Common Shares, $.0011 par value per share	4,904	$37.42	D
Stock Option (Right to Buy)	⁽²⁾	02/26/2031	Common Shares, $.0011 par value per share	8,685	$30.82	D
Stock Option (Right to Buy)	⁽³⁾	02/25/2032	Common Shares, $.0011 par value per share	9,139	$42.54	D
Stock Option (Right to Buy)	⁽⁴⁾	02/24/2033	Common Shares, $.0011 par value per share	5,539	$64.17	D
Stock Option (Right to Buy)	⁽⁵⁾	03/06/2033	Common Shares, $.0011 par value per share	650	$66.7	D
Stock Option (Right to Buy)	⁽⁶⁾	02/27/2034	Common Shares, $.0011 par value per share	4,232	$82.22	D
Stock Option (Right to Buy)	⁽⁷⁾	03/04/2035	Common Shares, $.0011 par value per share	7,148	$91.87	D
Stock Option (Right to Buy)	05/02/2028	05/02/2035	Common Shares, $.0011 par value per share	3,841	$92.48	D
Stock Option (Right to Buy)	⁽⁸⁾	03/03/2036	Common Shares, $.0011 par value per share	6,834	$100.48	D

Explanation of Responses:

1. This stock option is exercisable in three equal annual installments commencing February 27, 2021, and the next two installments on February 27, 2022 and February 27, 2023, subject to the applicable award agreement.

2. This stock option is exercisable in three equal annual installments commencing February 26, 2022, and the next two installments on February 26, 2023 and February 26, 2024, subject to the applicable award agreement.

3. This stock option is exercisable in three equal annual installments commencing February 25, 2023, and the next two installments on February 25, 2024 and February 25, 2025, subject to the applicable award agreement.

4. This stock option is exercisable in three equal annual installments commencing February 24, 2024, and the next two installments on February 24, 2025 and February 24, 2026, subject to the applicable award agreement.

5. This stock option is exercisable in three equal annual installments commencing March 6, 2024, and the next two installments on March 6, 2025 and March 6, 2026, subject to the applicable award agreement.

6. The stock option is exercisable in three equal annual installments commencing February 27, 2025, and the next two installments on February 27, 2026 and February 27, 2027, subject to the applicable award agreement

7. The stock option is exercisable in three equal annual installments commencing March 4, 2026, and the next two installments on March 4, 2027 and March 4, 2028, subject to the applicable award agreement.

8. 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/ Robert Michael Schmeiser	09/14/2026
	** 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 5 (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 3: SEC 1473 (03-26)