Exhibit 21

SUBSIDIARIES OF REGISTRANT

Name	Jurisdiction of Incorporation
Alternative Re Holdings Limited	Bermuda
Alternative Re Limited	Bermuda
Alternative Underwriting Services, Ltd.	Bermuda
Alwyn Insurance Company Limited	Gibraltar
Arch Capital Group (U.S.) Inc.	Delaware
Arch Capital Holdings Ltd.	Bermuda
Arch Capital Services Inc.	Delaware
Arch Europe Insurance Services Ltd	United Kingdom
Arch Excess & Surplus Insurance Company	Missouri
Arch Financial Holdings B.V.	Netherlands
Arch Financial Holdings Europe I Limited	Ireland
Arch Financial Holdings Europe II Limited	Ireland
Arch Financial Holdings Europe III Limited	Ireland
Arch Fulfillment Operations Inc.	Delaware
Arch Indemnity Insurance Company	Missouri
Arch Insurance Canada Ltd.	Canada
Arch Insurance Company	Missouri
Arch Insurance Company (Europe) Limited	United Kingdom
Arch Insurance Group Inc.	Delaware
Arch Insurance Solutions Inc.	Delaware
Arch International Services Inc.	Delaware
Arch Investments I LLC	Delaware
Arch Investment Holdings I Ltd.	Bermuda
Arch Investment Holdings II Ltd.	Bermuda
Arch Investment Holdings III Ltd.	Bermuda
Arch Investment Holdings IV Ltd.	Bermuda

Arch Investment Management Ltd.	Bermuda
Arch LMI Pty Ltd	Australia
Arch Mortgage Assurance Company	Wisconsin
Arch Mortgage Insurance Limited	Ireland
Arch Mortgage Guaranty Company	Wisconsin
Arch Mortgage Insurance Company	Wisconsin
Arch Mortgage Reinsurance Company	Wisconsin
Arch Re Accident & Health ApS	Denmark
Arch Re Facultative Underwriters Inc.	Delaware
Arch Reinsurance Company	Delaware
Arch Reinsurance Europe Underwriting Limited	Ireland
Arch Reinsurance Ltd.	Bermuda
Arch Risk Partners Ltd.	United Kingdom
Arch Risk Transfer Services Ltd.	Bermuda
Arch Specialty Insurance Agency Inc.	Missouri
Arch Specialty Insurance Company	Missouri
Arch Syndicate Investments Ltd	United Kingdom
Arch Underwriters Ltd.	Bermuda
Arch Underwriters Europe Limited	Ireland
Arch Underwriting Agency LLC	Delaware
Arch Underwriting at Lloyd’s Ltd	United Kingdom
Arch Underwriting at Lloyd’s (Australia) Pty Ltd	Australia
Arch Underwriting Managers at Lloyd’s (South Africa) (Pty) Limited	Republic of South Africa
Arch U.S. MI Holdings Inc.	Delaware
Arch U.S. MI Services Inc.	Delaware
First American Services Corporation	Missouri
Insurance Technology Services Inc.	Philippines
Resource Underwriting Pacific Pty Ltd	Australia