MITSUI SUMITOMO INSURANCE CO LTD
10% Owner · BERKLEY W R CORP
Every open-market stock purchase MITSUI SUMITOMO INSURANCE CO LTD has reported to the SEC on Form 4 that met our signal bar, parsed straight from the filings. Insiders sell for many reasons, but they buy with their own money for one — this page tracks where those buys landed inside insider clusters and how the prices paid compare to where the stock trades now.
Where the buys stand today
- WRB+1.6% vs price paidBERKLEY W R CORP
42 purchases totalling $332.7M at an average of $69.79 per share; the stock last traded at $70.92. See all insider buying in WRB →
Avg price paid$69.79Latest price$70.92Market cap$27.6B
Cluster participation
Buys that landed within days of other insiders buying the same stock — the pattern this site exists to catch.
All reported buys
| Date | Ticker | Shares | Price | Value | Filing |
|---|---|---|---|---|---|
| Mar 3, 2026 | WRBcluster | 38,991 | $71.60 | $2.8M | SEC ↗ |
| Mar 3, 2026 | WRBcluster | 73,185 | $72.52 | $5.3M | SEC ↗ |
| Mar 2, 2026 | WRBcluster | 45,103 | $72.29 | $3.3M | SEC ↗ |
| Mar 2, 2026 | WRBcluster | 100,897 | $73.20 | $7.4M | SEC ↗ |
| Feb 27, 2026 | WRBcluster | 147,000 | $71.63 | $10.5M | SEC ↗ |
| Feb 26, 2026 | WRBcluster | 7,509 | $72.11 | $541.5K | SEC ↗ |
| Feb 26, 2026 | WRBcluster | 145,491 | $71.65 | $10.4M | SEC ↗ |
| Feb 18, 2026 | WRBcluster | 45,250 | $70.96 | $3.2M | SEC ↗ |
| Feb 18, 2026 | WRBcluster | 239,750 | $70.58 | $16.9M | SEC ↗ |
| Feb 17, 2026 | WRBcluster | 281,386 | $71.19 | $20.0M | SEC ↗ |
| Feb 4, 2026 | WRBcluster | 22,415 | $70.25 | $1.6M | SEC ↗ |
| Feb 4, 2026 | WRBcluster | 2,585 | $69.77 | $180.4K | SEC ↗ |
| Feb 3, 2026 | WRBcluster | 31,653 | $68.87 | $2.2M | SEC ↗ |
| Feb 3, 2026 | WRBcluster | 8,347 | $67.75 | $565.5K | SEC ↗ |
| Feb 2, 2026 | WRBcluster | 237,062 | $67.71 | $16.1M | SEC ↗ |
| Feb 2, 2026 | WRBcluster | 13,159 | $68.42 | $900.3K | SEC ↗ |
| Jan 30, 2026 | WRBcluster | 195,000 | $68.36 | $13.3M | SEC ↗ |
| Jan 29, 2026 | WRBcluster | 262,282 | $68.08 | $17.9M | SEC ↗ |
| Jan 29, 2026 | WRBcluster | 27,718 | $68.56 | $1.9M | SEC ↗ |
| Jan 14, 2026 | WRBcluster | 208,272 | $69.23 | $14.4M | SEC ↗ |
| Jan 14, 2026 | WRBcluster | 21,728 | $68.80 | $1.5M | SEC ↗ |
| Jan 13, 2026 | WRBcluster | 206,499 | $68.15 | $14.1M | SEC ↗ |
| Jan 13, 2026 | WRBcluster | 118,501 | $67.82 | $8.0M | SEC ↗ |
| Jan 12, 2026 | WRBcluster | 256,041 | $68.73 | $17.6M | SEC ↗ |
| Jan 9, 2026 | WRBcluster | 105,674 | $69.56 | $7.4M | SEC ↗ |
| Jan 9, 2026 | WRBcluster | 8,150 | $70.12 | $571.5K | SEC ↗ |
| Jan 9, 2026 | WRBcluster | 161,176 | $68.48 | $11.0M | SEC ↗ |
| Jan 8, 2026 | WRBcluster | 39,302 | $69.69 | $2.7M | SEC ↗ |
| Jan 8, 2026 | WRBcluster | 4,187 | $68.79 | $288.0K | SEC ↗ |
| Jan 8, 2026 | WRBcluster | 151,511 | $70.32 | $10.7M | SEC ↗ |
| Jan 7, 2026 | WRBcluster | 10,378 | $69.20 | $718.2K | SEC ↗ |
| Jan 7, 2026 | WRBcluster | 254,622 | $68.47 | $17.4M | SEC ↗ |
| Jan 6, 2026 | WRBcluster | 92,357 | $70.21 | $6.5M | SEC ↗ |
| Jan 6, 2026 | WRBcluster | 122,931 | $69.93 | $8.6M | SEC ↗ |
| Jan 5, 2026 | WRBcluster | 35,894 | $70.23 | $2.5M | SEC ↗ |
| Jan 5, 2026 | WRBcluster | 153,686 | $70.78 | $10.9M | SEC ↗ |
| Jan 5, 2026 | WRBcluster | 11,350 | $69.20 | $785.4K | SEC ↗ |
| Dec 29, 2025 | WRBcluster | 205,000 | $70.77 | $14.5M | SEC ↗ |
| Dec 26, 2025 | WRBcluster | 220,000 | $70.56 | $15.5M | SEC ↗ |
| Dec 24, 2025 | WRBcluster | 220,000 | $70.51 | $15.5M | SEC ↗ |
| Dec 23, 2025 | WRBcluster | 232,546 | $70.31 | $16.4M | SEC ↗ |
| Dec 23, 2025 | WRBcluster | 2,027 | $71.15 | $144.2K | SEC ↗ |
Get alerted the next time MITSUI SUMITOMO INSURANCE CO LTD — or any insider — buys
We watch every Form 4 as it hits SEC EDGAR and alert you when insiders cluster into the same stock.
About this data
Figures are parsed from MITSUI SUMITOMO INSURANCE CO LTD's Form 4 filings on SEC EDGAR (CIK 1142206) and cover open-market purchases (transaction code P) — grants, option exercises, and sales are excluded, which is why totals here can differ from raw filing counts. Every row links to its source document.
This page is informational and reflects public filing data. It is not investment advice.