ML
Insider
Mitsui Sumitomo Insurance Co Ltd
10% ownerMitsui Sumitomo Insurance Co Ltd (10% owner) filed 20 Form 4 reports as a reporting entity in the trailing twelve months (20 purchases, 0 sales, 1 filed past the two-business-day deadline), most often in W. R. Berkley Corporation (WRB). Across 20 priced purchase filings, the average 21-session return was -1.0% from execution and -1.3% from disclosure (delay-adjusted; derived). The largest single filing was $69.2M of WRB (1,028,131 sh across 8 lots, as filed), executed Jan 26.
Add to watchlistReturn, ttmiAverage return per filing, trailing twelve months
-1.0%
avg across 20 priced filings
Delay-adjustediThe same average, entered at disclosure dates
-1.3%
same 20 filings, from disclosure
Filings, ttm
20
20 buys · 0 sells · 1 late
Median delay
1d
execution → disclosure
Volume, ttmiDollar value disclosed in the trailing twelve months
$705.4M
shares × price, as filed
Last traded
Mar 3
Filed Mar 3
Median ADV $162.5M across their filed names
Impact on $10,000 · 12M
$9,590 (-4.1%)
S&P 500 $11,725 (+17.2%) · 21.3 pts behind
Mitsui Sumitomo Insurance Co Ltd
S&P 500
Compounded across filings from disclosure dates · past 12 months
Open performance→Volume by month
Buys $705.4M
Sells $0
Shares × price, as filed · by filing month · past 24 months
Sectors filed on
Financial Services
20 filings
Sector per market data · by filing · past 12 months
Most traded names
WRBRecent filings
WRBPURCHASE
W. R. Berkley Corporation
View filing →
$47.4M681,218 sh across 7 lots
Exec Jan 5
Filed Jan 7 · 7:30 PM ET WRBPURCHASE W. R. Berkley Corporation View filing → $47.2M
672,734 sh across 3 lots
Exec Dec 30 2025
Filed Jan 2 · 7:00 PM ET WRBPURCHASE W. R. Berkley Corporation View filing → $62.0M
879,573 sh across 5 lots
Exec Dec 23 2025
Filed Dec 29 2025 · 7:00 PM ET † WRBPURCHASE W. R. Berkley Corporation View filing → $42.5M
610,350 sh across 4 lots
Exec Dec 18 2025
Filed Dec 22 2025 · 8:45 PM ET