Mitsui Sumitomo Insurance Co Ltd

10% Owner

4 companies

Insider Signal Score

Weak

Trades Analyzed

12M Win Rate

Avg 3M Return

-5.2%

Avg 12M Return

Mitsui Sumitomo Insurance Co Ltd is a 10% Owner at BERKLEY W R CORP with holdings across 4 companies. Recent SEC Form 4 filings include 46 buys and 0 sells.

Estimated insider holdings value: $6638.7M based on current market prices.

Holdings by Company

WRB-PFFeb 18, 2026

Current Shares57.16M

Value$1.07B

Net Activity+2.12M

Bought: 2.12MSold: 0

WRB-PHFeb 13, 2026

Current Shares56.60M

Value$865.36M

Net Activity+40.0K

Bought: 40.0KSold: 0

WRB-PEJan 23, 2026

Current Shares54.42M

Value$1.16B

Net Activity+1.86M

Bought: 1.86MSold: 0

WRBJan 14, 2026

Current Shares52.73M

Value$3.54B

Net Activity+4.12M

Bought: 4.12MSold: 0

Transaction History

Showing 10 filings

Date	Ticker	Role	Type	Shares	Price	Value	Chg%	3M	12M
Feb 18, 2026	WRB-PF Berkley W R Corp	10% Owner	Buy	566,386	$70.92	$40,166,492.29	+0.3%	-	-
Feb 13, 2026	WRB-PH Berkley W R Corp	10% Owner	Buy	40,000	$70.93	$2,837,252.14	-	-	-
Feb 6, 2026	WRB-PF Berkley W R Corp	10% Owner	Buy	40,000	$70.88	$2,835,251.26	-	-	-
Jan 30, 2026	WRB-PF Berkley W R Corp	10% Owner	Buy	485,000	$68.22	$33,087,352.65	+0.3%	-	-
Jan 28, 2026	WRB-PF Berkley W R Corp	10% Owner	Buy	1,028,931	$67.35	$69,297,689.81	+0.2%	-	-
Jan 23, 2026	WRB-PE Berkley W R Corp	10% Owner	Buy	698,000	$67.19	$46,898,491.76	+0.4%	-	-
Jan 21, 2026	WRB-PE Berkley W R Corp	10% Owner	Buy	630,000	$67.64	$42,612,018.34	+0.3%	-	-
Jan 16, 2026	WRB-PE Berkley W R Corp	10% Owner	Buy	535,000	$68.49	$36,644,800.51	+0.3%	-	-
Jan 14, 2026	WRB Berkley W R Corp	10% Owner	Buy	811,041	$68.58	$55,622,806.93	+0.3%	-5.0%	-
Jan 9, 2026	WRB Berkley W R Corp	10% Owner	Buy	470,000	$69.45	$32,640,884.11	+0.2%	-1.8%	-

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