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, 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 *   Rajeh Maamoun 2. Date of Event Requiring Statement (Month/Day/Year) 10/01/2017 3. Issuer Name and Ticker or Trading Symbol ARCH CAPITAL GROUP LTD. [ACGL] (Last) (First) (Middle) C/O ARCH CAPITAL GROUP LTD, 100 PITTS BAY ROAD, WATERLOO HOUSE 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Chairman & CEO Arch Re Group 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) PEMBROKE, D0 HM 08 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 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, $0.33 par value per share 115,060 D Â

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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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 of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Share Appreciation Right	  (1)	05/06/2021	Common Shares, $.0033 par value per share	8,850	$ 33.913	D	Â
Share Appreciation Right	  (2)	05/09/2022	Common Shares, $.0033 par value per share	8,250	$ 38.58	D	Â
Share Appreciation Right	  (3)	07/01/2022	Common Shares, $.0033 par value per share	19,071	$ 39.69	D	Â
Share Appreciation Right	11/12/2017	11/12/2022	Common Shares, $.0033 par value per share	16,130	$ 42.65	D	Â
Share Appreciation Right	  (4)	05/09/2023	Common Shares, $.0033 par value per share	6,600	$ 53.53	D	Â
Share Appreciation Right	  (5)	05/13/2024	Common Shares, $.0033 par value per share	6,500	$ 57.27	D	Â
Share Appreciation Right	  (6)	07/01/2024	Common Shares, $.0033 par value per share	10,762	$ 58	D	Â
Stock Option (right to buy)	  (7)	05/13/2025	Common Shares, $.0033 par value per share	6,680	$ 62.505	D	Â
Stock Option (right to buy)	  (8)	05/13/2026	Common Shares, $.0033 par value per share	5,300	$ 71.7	D	Â
Stock Option (right to buy)	  (9)	05/08/2027	Common Shares, $.0033 par value per share	5,310	$ 96.26	D	Â
Stock Option (right to buy)	  (10)	09/19/2027	Common Shares, $.0033 par value per share	10,500	$ 96.39	D	Â

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Rajeh Maamoun C/O ARCH CAPITAL GROUP LTD 100 PITTS BAY ROAD, WATERLOO HOUSE PEMBROKE, D0 HM 08	Â	Â	  Chairman & CEO Arch Re Group	Â

Signatures

/s/ Maamoun Rajeh		10/06/2017
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	The Share Appreciation Right became exercisable in three equal annual installments, with the first installment becoming exercisable on May 6, 2012 and the next two installments on May 6, 2013 and May 6, 2014, subject to the applicable award agreement.
(2)	The Share Appreciation Right became exercisable in three equal annual installments, with the first installment becoming exercisable on May 9, 2013 and the next two installments on May 9, 2014 and May 9, 2015, subject to the applicable award agreement.
(3)	The Share Appreciation Right became exercisable in three equal annual installments, with the first installment becoming exercisable on July 1, 2013 and the next two installments on July 1, 2014 and July 1, 2015, subject to the applicable award agreement.
(4)	The Share Appreciation Right became exercisable in three equal annual installments, with the first installment becoming exercisable on May 9, 2014 and the next two installments on May 9, 2015 and May 9, 2016, subject to the applicable award agreement.
(5)	The Share Appreciation Right became exercisable in three equal annual installments, with the first installment becoming exercisable on May 13, 2015 and the next two installments on May 13, 2016 and May 13, 2017, subject to the applicable award agreement.
(6)	The Share Appreciation Right became exercisable in three equal annual installments, with the first installment becoming exercisable on July 1, 2015 and the next two installments on July 1, 2016 and July 1, 2017, subject to the applicable award agreement.
(7)	The Stock Option is exercisable in three equal annual installments, with the first installment becoming exercisable on May 13, 2016 and the next two installments on May 13, 2017 and May 13, 2018, subject to the applicable award agreement.
(8)	The Stock Option is exercisable in three equal annual installments, with the first installment becoming exercisable on May 13, 2017 and the next two installments on May 13, 2018 and May 13, 2019, subject to the applicable award agreement.
(9)	The Stock Option is exercisable in three equal annual installments, with the first installment becoming exercisable on May 8, 2018 and the next two installments on May 8, 2019 and May 8, 2020, subject to the applicable award agreement.
(10)	The Stock Option is exercisable in three equal annual installments, with the first installment becoming exercisable on September 19, 2018 and the next two installments on September 19, 2019 and September 19, 2020, subject to the applicable award agreement.

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