Ownership Submission
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, 4TH FLOOR, 45 REID STREET		 3. Date of Earliest Transaction (Month/Day/Year)
11/17/2009
(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
Series B Non-Cumulative Preferred Shares (non-convertible) 11/17/2009   P   4,301.3862 (1) A $ 22.1933 67,273.3862 D  
Series A Non-Cumulative Preferred Shares (non-convertible) 11/17/2009   P   703.4855 (1) A $ 21.0533 11,224.4855 D  
Common Shares, $.01 par value per share 05/14/2010   G V 1,350 D $ 0 202,760 D  
Series B Non-Cumulative Preferred Shares (non-convertible)               67,273.3862 (2) I By GRAT (2)
Series A Non-Cumulative Preferred Shares (non-convertible)               11,224.485 (2) I BY GRAT (2)
Common Shares, $.01 par value per share               129,415 I By Limited Liability Company (3)
Series B Non-Cumulative Preferred Shares (non-convertible)               1,400 I By spouse
Common Shares, $.01 par value per share               7,744 I By children

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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
Stock Option (right to buy) $ 56.27               (4) 02/23/2016 Common Shares, $.01 par value per share 150,000 (2)   150,000 (2) I By GRAT
Share Appreciation Right $ 71.12               (5) 05/11/2017 Common Shares, $.01 par value per share 45,000 (2)   45,000 (2) I By GRAT
Share Appreciation Right $ 69.3               (6) 05/09/2018 Common Shares, $.01 par value per share 45,000 (2)   45,000 (2) I By GRAT
Share Appreciation Right $ 57.88               (7) 05/06/2019 Common Shares, $.01 par value per share 38,250 (2)   38,250 (2) I By GRAT
Share Appreciation Right $ 74             02/25/2010 02/25/2020 Common Shares, $.01 par value per share 70,751 (2)   70,751 (2) I By GRAT
Share Appreciation Right $ 75.03               (8) 05/05/2020 Common Shares, $01 par value per share 42,000 (2)   42,000 (2) I By GRAT

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
IORDANOU CONSTANTINE
WESSEX HOUSE, 4TH FLOOR
45 REID STREET
HAMILTON, D0 HM 12		   X     Chairman, President & CEO  

Signatures

 /s/ Louis T. Petrillo, Attorney in fact   06/16/2010
**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 preferred shares were acquired through a broker-sponsored dividend reinvestment program.
(2) The preferred shares, stock options and share appreciation rights were previously reported as directly beneficially owned but were contributed to a grantor retained annuity trust on June 8, 2010.
(3) The shares are owned by Mathiatis LLC, a limited liability company. The reporting person owns all of the membership interests in Mathiatis LLC and serves as its sole managing member.
(4) The stock option became exercisable in three equal annual installments with the first installment being exercisable on February 23, 2007 and the second and third installments being exercisable on February 23, 2008 and February 23, 2009.
(5) The share appreciation right became exercisable in three equal annual installments with the first installment being exercisable on May 11, 2008 and the second and third installments being exercisable on May 11, 2009 and May 11, 2010.
(6) The share appreciation right becomes exercisable in three equal annual installments with the first installment being exercisable on May 9, 2009 and the second and third installments being exercisable on May 9, 2010 and May 9, 2011.
(7) The share appreciation right becomes exercisable in three equal annual installments with the first installment being exercisable on May 6, 2010 and the second and third installments being exercisable on May 6, 2011 and May 6, 2012.
(8) The share appreciation right becomes exercisable in three equal annual installments with the first installment being exercisable on May 5, 2011 and the second and third installments being exercisable on May 5, 2012 and May 5, 2013.

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