FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * IORDANOU CONSTANTINE   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 __X__ Officer (give title below) _____ Other (specify below) Chairman, President & CEO (Last) (First) (Middle) WESSEX HOUSE, 5TH FLOOR, 45 REID STREET 3. Date of Earliest Transaction (Month/Day/Year) 12/03/2012 (Street) HAMILTON, D0 HM 12 4. If Amendment, Date 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 (City) (State) (Zip) 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, $.0033 par value per share 11/21/2012   J V 14,000 D $ 0 (1) 250,000 I By Limited Liability Company (1) Common Shares, $.0033 par value per share               636,062 (2) D   Common Shares, $.0033 par value per share 12/03/2012   S(5)   100,468 (5) D $ 44.6625 (3) 535,594 D   Common Shares, $.0033 par value per share 12/03/2012   S(5)   500 (5) D $ 45.129 (4) 535,094 D   Common Shares, $.0033 par value per share               379,314 I By 2005 GRAT Common Shares, $.0033 par value per share               116,613 I By Limited Liability Company Common Shares, $.0033 par value per share               11,616 I By child

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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 Underlying Securities (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 of Derivative Security: 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

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
IORDANOU CONSTANTINE WESSEX HOUSE, 5TH FLOOR 45 REID STREET HAMILTON, D0 HM 12	X		Chairman, President & CEO

Signatures

/s/ Louis T. Petrillo, Attorney in fact		12/03/2012
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	The common shares were distributed from Protaras LLC, a limited liability company ("Protaras LLC") to the reporting person. The reporting person owns all of the membership interests in Protaras LLC and serves as its sole managing member. The distribution resulted in the common shares being changed from indirect ownership by the reporting person to direct ownership by the reporting person. See FN2.
(2)	On November 21, 2012, 14,000 common shares were distributed from Protaras LLC to the reporting person. The distribution resulted in the common shares being changed from indirect ownership by the reporting person to direct ownership by the reporting person. See FN1.
(3)	Represents a weighted average sales price; the sales prices range from $44.52 to $44.87. Upon request, the full sale information regarding the number of shares sold at each price increment will be provided to the Commission or to a security hoder of the issuer.
(4)	Represents a weighted average sales price; the sales prices range from 45.125 to $45.13. Upon request, the full sale information regarding the number of shares sold at each price increment will be provided to the Commission or to a security hoder of the issuer.
(5)	The shares were sold in order to satisfy state and federal income tax obligations.

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