Exhibit 21

SUBSIDIARIES OF ALLEGHANY

Alleghany Capital Corporation (Delaware)

Alleghany Consulting, Inc. (Delaware)

Alleghany Funding Corporation (Delaware)

Alleghany Properties Holdings LLC (Delaware)

Alleghany Properties LLC (Delaware)

Bibb Steel and Supply Company (Delaware)

MSL Property Holdings, Inc. (Delaware)

MSL Capital Recovery Corp. (Delaware)

J & E Corporation (Tennessee)

Alleghany Insurance Holdings LLC (Delaware)

AIHL Re LLC (Vermont)

Capitol Transamerica Corporation (Wisconsin)

Capitol Facilities Corporation (Wisconsin)

Capitol Indemnity Corporation (Wisconsin)

Capitol Specialty Insurance Corporation (Wisconsin)

Darwin Professional Underwriters, Inc. (Delaware—55%)

Darwin Group, Inc. (Delaware)

Darwin National Assurance Company (Delaware)

Darwin Select Insurance Company (Arkansas)

Platte River Insurance Company (Nebraska)

RSUI Group, Inc. (Delaware)

Resurgens Specialty Underwriting, Inc. (Georgia)

RSA Surplus Lines Insurance Services, Inc. (Delaware)

RSUI Indemnity Company (New Hampshire)

Landmark American Insurance Company (Oklahoma)