Schedule IV - Reinsurance

12 Months Ended

Dec. 31, 2020

SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract]

SCHEDULE IV

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

REINSURANCE

(U.S. dollars in thousands)


	Gross Amount		Ceded to Other Companies (1)		Assumed From Other Companies (1)		Net Amount		Percentage of Amount Assumed to Net
Year Ended December 31, 2020
Premiums Written:
Insurance	$	4,659,416	$	(1,525,655)	$	29,146	$	3,162,907	0.9	%
Reinsurance	305,435		(1,014,716)		3,166,651		2,457,370		128.9	%
Mortgage	1,192,316		(194,149)		281,683		1,279,850		22.0	%
Other	396,743		(190,957)		331,803		537,589		61.7	%
Total	$	6,553,910	$	(2,650,352)	$	3,534,158	$	7,437,716	47.5	%
Year Ended December 31, 2019
Premiums Written:
Insurance	$	3,879,752	$	(1,266,267)	$	28,241	$	2,641,726	1.1	%
Reinsurance	238,229		(720,500)		2,084,994		1,602,723		130.1	%
Mortgage	1,224,373		(204,509)		241,892		1,261,756		19.2	%
Other	339,169		(222,019)		415,712		532,862		78.0	%
Total	$	5,681,523	$	(2,099,893)	$	2,457,437	$	6,039,067	40.7	%
Year Ended December 31, 2018
Premiums Written:
Insurance	$	3,232,234	$	(1,050,207)	$	30,098	$	2,212,125	1.4	%
Reinsurance	213,809		(539,950)		1,698,713		1,372,572		123.8	%
Mortgage	1,139,099		(202,833)		221,609		1,157,875		19.1	%
Other	253,760		(130,840)		481,255		604,175		79.7	%
Total	$	4,838,902	$	(1,614,257)	$	2,122,102	$	5,346,747	39.7	%

(1) Certain amounts included in the gross premiums written of each segment are related to intersegment transactions and are included in the gross premiums written of each segment. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.