Insider · CIK 0001142206
Mitsui Sumitomo Insurance Co Ltd
Files at WRB (BERKLEY W R CORP). First filing Dec 22, 2025, latest Mar 3, 2026.
In brief
Mitsui Sumitomo Insurance Co Ltd files SEC Form 4 as 10% owner at WRB (BERKLEY W R CORP). Since Dec 22, 2025, Mitsui Sumitomo Insurance Co Ltd has reported 20 open-market buys worth $705M and 0 open-market sells worth $0, the latest filed on Mar 3, 2026.
A track record needs three past buys with six months of prices behind them; Mitsui Sumitomo Insurance Co Ltd has 0, so none is measured yet.
The newest scored trade: bought $19M of WRB on Mar 2, 2026, filed Mar 3, 2026, scored 17 (weak), under a 10b5-1 plan. In the last 12 months: 20 buys worth $705M and 0 sells worth $0.
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
WRB: BERKLEY W R CORP
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 17Weak | BERKLEY W R CORP | $19M 258,176 shares | +0% | +22% from low-5% from high | |
| 17Weak | BERKLEY W R CORP | $21M 300,000 shares | +1% | +20% from low-7% from high | |
| 17Weak | BERKLEY W R CORP | $39M 553,654 shares | +1% | +19% from low-8% from high | |
| 17Weak | BERKLEY W R CORP | $36M 505,582 shares | +1% | +20% from low-9% from high | |
| 22Weak | BERKLEY W R CORP | $40M 566,386 shares | +1% | +21% from low-8% from high | |
| 17Weak | BERKLEY W R CORP | $2.8M 40,000 shares | +0% | +22% from low-7% from high | |
| 17Weak | BERKLEY W R CORP | $6.8M 97,996 shares | +0% | +18% from low-10% from high | |
| 17Weak | BERKLEY W R CORP | $2.8M 40,000 shares | +0% | +21% from low-8% from high | |
| 17Weak | BERKLEY W R CORP | $21M 315,221 shares | +1% | +17% from low-12% from high | |
| 17Weak | BERKLEY W R CORP | $33M 485,000 shares | +1% | +19% from low-12% from high | |
| 22Weak | BERKLEY W R CORP | $69M 1,028,931 shares | +2% | +17% from low-13% from high | |
| 22Weak | BERKLEY W R CORP | $47M 698,000 shares | +1% | +22% from low-13% from high | |
| 22Weak | BERKLEY W R CORP | $43M 630,000 shares | +1% | +22% from low-12% from high | |
| 22Weak | BERKLEY W R CORP | $37M 535,000 shares | +1% | +24% from low-11% from high | |
| 22Weak | BERKLEY W R CORP | $56M 811,041 shares | +2% | +24% from low-11% from high | |
| 17Weak | BERKLEY W R CORP | $33M 470,000 shares | +1% | +27% from low-9% from high | |
| 22Weak | BERKLEY W R CORP | $47M 681,218 shares | +1% | +28% from low-8% from high | |
| 22Weak | BERKLEY W R CORP | $47M 672,734 shares | +1% | +28% from low-8% from high | |
| 22Weak | BERKLEY W R CORP | $62M 879,573 shares | +2% | +27% from low-9% from high | |
| 17Weak | BERKLEY W R CORP | $43M 610,350 shares | +1% | +26% from low-10% from high |
Transactions
The newest 50 of 94 rows this insider has filed.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Mar 2, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +45,103 | $72.29 | $3.3M | 58,567,377 | Mar 3, 2026 |
| Mar 2, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +100,897 | $73.20 | $7.4M | 58,668,274 | Mar 3, 2026 |
| Mar 3, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +38,991 | $71.60 | $2.8M | 58,707,265 | Mar 3, 2026 |
| Mar 3, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +73,185 | $72.52 | $5.3M | 58,780,450 | Mar 3, 2026 |
| Feb 26, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +145,491 | $71.65 | $10M | 58,367,765 | Feb 27, 2026 |
| Feb 26, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +7,509 | $72.11 | $542k | 58,375,274 | Feb 27, 2026 |
| Feb 27, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +147,000 | $71.63 | $11M | 58,522,274 | Feb 27, 2026 |
| Feb 23, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +203,590 | $71.09 | $14M | 57,872,210 | Feb 25, 2026 |
| Feb 23, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +16,410 | $71.80 | $1.2M | 57,888,620 | Feb 25, 2026 |
| Feb 24, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +103,192 | $70.52 | $7.3M | 57,991,812 | Feb 25, 2026 |
| Feb 24, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +61,594 | $71.28 | $4.4M | 58,053,406 | Feb 25, 2026 |
| Feb 25, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +154,512 | $71.39 | $11M | 58,207,918 | Feb 25, 2026 |
| Feb 25, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +14,356 | $71.77 | $1.0M | 58,222,274 | Feb 25, 2026 |
| Feb 19, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +300,986 | $70.53 | $21M | 57,464,024 | Feb 20, 2026 |
| Feb 19, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +44,014 | $71.50 | $3.1M | 57,508,038 | Feb 20, 2026 |
| Feb 20, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +160,582 | $70.80 | $11M | 57,668,620 | Feb 20, 2026 |
| Feb 17, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +281,386 | $71.19 | $20M | 56,878,038 | Feb 18, 2026 |
| Feb 18, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +239,750 | $70.58 | $17M | 57,117,788 | Feb 18, 2026 |
| Feb 18, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +45,250 | $70.96 | $3.2M | 57,163,038 | Feb 18, 2026 |
| Feb 12, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +17,599 | $71.88 | $1.3M | 56,574,251 | Feb 13, 2026 |
| Feb 12, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +2,401 | $72.76 | $175k | 56,576,652 | Feb 13, 2026 |
| Feb 13, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +15,406 | $69.73 | $1.1M | 56,592,058 | Feb 13, 2026 |
| Feb 13, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +4,314 | $70.30 | $303k | 56,596,372 | Feb 13, 2026 |
| Feb 13, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +280 | $71.18 | $20k | 56,596,652 | Feb 13, 2026 |
| Feb 9, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +35,952 | $69.27 | $2.5M | 56,494,608 | Feb 11, 2026 |
| Feb 9, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +4,048 | $70.32 | $285k | 56,498,656 | Feb 11, 2026 |
| Feb 10, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +21,884 | $69.09 | $1.5M | 56,520,540 | Feb 11, 2026 |
| Feb 10, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +12,082 | $69.92 | $845k | 56,532,622 | Feb 11, 2026 |
| Feb 11, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +9,289 | $69.59 | $646k | 56,541,911 | Feb 11, 2026 |
| Feb 11, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +3,578 | $70.50 | $252k | 56,545,489 | Feb 11, 2026 |
| Feb 11, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +11,163 | $71.45 | $798k | 56,556,652 | Feb 11, 2026 |
| Feb 5, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +6,528 | $70.79 | $462k | 56,425,184 | Feb 6, 2026 |
| Feb 5, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +13,472 | $71.25 | $960k | 56,438,656 | Feb 6, 2026 |
| Feb 6, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +15,694 | $70.46 | $1.1M | 56,454,350 | Feb 6, 2026 |
| Feb 6, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +4,306 | $71.39 | $307k | 56,458,656 | Feb 6, 2026 |
| Feb 2, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +237,062 | $67.71 | $16M | 56,340,497 | Feb 4, 2026 |
| Feb 2, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +13,159 | $68.42 | $900k | 56,353,656 | Feb 4, 2026 |
| Feb 3, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +8,347 | $67.75 | $565k | 56,362,003 | Feb 4, 2026 |
| Feb 3, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +31,653 | $68.87 | $2.2M | 56,393,656 | Feb 4, 2026 |
| Feb 4, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +2,585 | $69.77 | $180k | 56,396,241 | Feb 4, 2026 |
| Feb 4, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +22,415 | $70.25 | $1.6M | 56,418,656 | Feb 4, 2026 |
| Jan 29, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +262,282 | $68.08 | $18M | 55,880,717 | Jan 30, 2026 |
| Jan 29, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +27,718 | $68.56 | $1.9M | 55,908,435 | Jan 30, 2026 |
| Jan 30, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +195,000 | $68.36 | $13M | 56,103,435 | Jan 30, 2026 |
| Jan 26, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +293,611 | $66.86 | $20M | 54,883,115 | Jan 28, 2026 |
| Jan 26, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +76,389 | $67.88 | $5.2M | 54,959,504 | Jan 28, 2026 |
| Jan 27, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +800 | $65.86 | $53k | 54,960,304 | Jan 28, 2026 |
| Jan 27, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +11,987 | $66.87 | $802k | 54,972,291 | Jan 28, 2026 |
| Jan 27, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +325,960 | $67.40 | $22M | 55,298,251 | Jan 28, 2026 |
| Jan 27, 2026 | WRB BERKLEY W R CORP | POpen-market purchase Common Stock10b5-1 | +8,582 | $68.56 | $588k | 55,306,833 | Jan 28, 2026 |
Questions about Mitsui Sumitomo Insurance Co Ltd
Answered from the filings on this page, as of the latest one.
Is Mitsui Sumitomo Insurance Co Ltd buying or selling?
In the last 12 months Mitsui Sumitomo Insurance Co Ltd reported 20 open-market buys worth $705M and 0 open-market sells worth $0 on SEC Form 4; the latest was bought $19M of WRB on Mar 2, 2026. Grants, option exercises and tax withholding are not counted.
How did Mitsui Sumitomo Insurance Co Ltd's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and Mitsui Sumitomo Insurance Co Ltd has 0.
Where does Mitsui Sumitomo Insurance Co Ltd file Form 4?
Mitsui Sumitomo Insurance Co Ltd has filed Form 4 at WRB (BERKLEY W R CORP). A Form 4 is required of officers, directors and holders of more than 10% of a share class within two business days of a trade.
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.