SEC Form 4 reporting owner
Mitsui Sumitomo Insurance Co LTD
Mitsui Sumitomo Insurance Co LTD has filed 94 Form 4 transactions reported between December 18, 2025 and March 3, 2026, as a reporting owner of BERKLEY W R CORP.
Name as filed: MITSUI SUMITOMO INSURANCE CO LTD
Open-market buys, 24 mo
$705.5M
94 lines
Open-market sales, 24 mo
None
reported
Companies
1
with Form 4 filings
Latest transaction
Mar 3, 2026
transaction date
Roles and reported holdings
Transaction history
All 94 reported transactions, newest first. Every row links to the Form 4 on SEC EDGAR.
| Date | Company | Type | Shares | Price | Value | Owned after | Filing |
|---|---|---|---|---|---|---|---|
| Mar 3, 2026 | WRB | Open-market purchaseCode P · direct | 73,185 | $72.52 | $5.3M@ $72.52 | 58,780,450 | Form 4 |
| Mar 3, 2026 | WRB | Open-market purchaseCode P · direct | 38,991 | $71.60 | $2.8M@ $71.60 | 58,707,265 | Form 4 |
| Mar 2, 2026 | WRB | Open-market purchaseCode P · direct | 100,897 | $73.20 | $7.4M@ $73.20 | 58,668,274 | Form 4 |
| Mar 2, 2026 | WRB | Open-market purchaseCode P · direct | 45,103 | $72.29 | $3.3M@ $72.29 | 58,567,377 | Form 4 |
| Feb 27, 2026 | WRB | Open-market purchaseCode P · direct | 147,000 | $71.63 | $10.5M@ $71.63 | 58,522,274 | Form 4 |
| Feb 26, 2026 | WRB | Open-market purchaseCode P · direct | 7,509 | $72.11 | $542K@ $72.11 | 58,375,274 | Form 4 |
| Feb 26, 2026 | WRB | Open-market purchaseCode P · direct | 145,491 | $71.65 | $10.4M@ $71.65 | 58,367,765 | Form 4 |
| Feb 25, 2026 | WRB | Open-market purchaseCode P · direct | 14,356 | $71.77 | $1.0M@ $71.77 | 58,222,274 | Form 4 |
| Feb 25, 2026 | WRB | Open-market purchaseCode P · direct | 154,512 | $71.39 | $11.0M@ $71.39 | 58,207,918 | Form 4 |
| Feb 24, 2026 | WRB | Open-market purchaseCode P · direct | 61,594 | $71.28 | $4.4M@ $71.28 | 58,053,406 | Form 4 |
| Feb 24, 2026 | WRB | Open-market purchaseCode P · direct | 103,192 | $70.52 | $7.3M@ $70.52 | 57,991,812 | Form 4 |
| Feb 23, 2026 | WRB | Open-market purchaseCode P · direct | 16,410 | $71.80 | $1.2M@ $71.80 | 57,888,620 | Form 4 |
| Feb 23, 2026 | WRB | Open-market purchaseCode P · direct | 203,590 | $71.09 | $14.5M@ $71.09 | 57,872,210 | Form 4 |
| Feb 20, 2026 | WRB | Open-market purchaseCode P · direct | 160,582 | $70.80 | $11.4M@ $70.80 | 57,668,620 | Form 4 |
| Feb 19, 2026 | WRB | Open-market purchaseCode P · direct | 44,014 | $71.50 | $3.1M@ $71.50 | 57,508,038 | Form 4 |
| Feb 19, 2026 | WRB | Open-market purchaseCode P · direct | 300,986 | $70.53 | $21.2M@ $70.53 | 57,464,024 | Form 4 |
| Feb 18, 2026 | WRB | Open-market purchaseCode P · direct | 45,250 | $70.96 | $3.2M@ $70.96 | 57,163,038 | Form 4 |
| Feb 18, 2026 | WRB | Open-market purchaseCode P · direct | 239,750 | $70.58 | $16.9M@ $70.58 | 57,117,788 | Form 4 |
| Feb 17, 2026 | WRB | Open-market purchaseCode P · direct | 281,386 | $71.19 | $20.0M@ $71.19 | 56,878,038 | Form 4 |
| Feb 13, 2026 | WRB | Open-market purchaseCode P · direct | 280 | $71.18 | $20K@ $71.18 | 56,596,652 | Form 4 |
| Feb 13, 2026 | WRB | Open-market purchaseCode P · direct | 4,314 | $70.30 | $303K@ $70.30 | 56,596,372 | Form 4 |
| Feb 13, 2026 | WRB | Open-market purchaseCode P · direct | 15,406 | $69.73 | $1.1M@ $69.73 | 56,592,058 | Form 4 |
| Feb 12, 2026 | WRB | Open-market purchaseCode P · direct | 2,401 | $72.76 | $175K@ $72.76 | 56,576,652 | Form 4 |
| Feb 12, 2026 | WRB | Open-market purchaseCode P · direct | 17,599 | $71.88 | $1.3M@ $71.88 | 56,574,251 | Form 4 |
| Feb 11, 2026 | WRB | Open-market purchaseCode P · direct | 11,163 | $71.45 | $798K@ $71.45 | 56,556,652 | Form 4 |
| Feb 11, 2026 | WRB | Open-market purchaseCode P · direct | 3,578 | $70.50 | $252K@ $70.50 | 56,545,489 | Form 4 |
| Feb 11, 2026 | WRB | Open-market purchaseCode P · direct | 9,289 | $69.59 | $646K@ $69.59 | 56,541,911 | Form 4 |
| Feb 10, 2026 | WRB | Open-market purchaseCode P · direct | 12,082 | $69.92 | $845K@ $69.92 | 56,532,622 | Form 4 |
| Feb 10, 2026 | WRB | Open-market purchaseCode P · direct | 21,884 | $69.09 | $1.5M@ $69.09 | 56,520,540 | Form 4 |
| Feb 9, 2026 | WRB | Open-market purchaseCode P · direct | 4,048 | $70.32 | $285K@ $70.32 | 56,498,656 | Form 4 |
| Feb 9, 2026 | WRB | Open-market purchaseCode P · direct | 35,952 | $69.27 | $2.5M@ $69.27 | 56,494,608 | Form 4 |
| Feb 6, 2026 | WRB | Open-market purchaseCode P · direct | 4,306 | $71.39 | $307K@ $71.39 | 56,458,656 | Form 4 |
| Feb 6, 2026 | WRB | Open-market purchaseCode P · direct | 15,694 | $70.46 | $1.1M@ $70.46 | 56,454,350 | Form 4 |
| Feb 5, 2026 | WRB | Open-market purchaseCode P · direct | 13,472 | $71.25 | $960K@ $71.25 | 56,438,656 | Form 4 |
| Feb 5, 2026 | WRB | Open-market purchaseCode P · direct | 6,528 | $70.79 | $462K@ $70.79 | 56,425,184 | Form 4 |
| Feb 4, 2026 | WRB | Open-market purchaseCode P · direct | 22,415 | $70.25 | $1.6M@ $70.25 | 56,418,656 | Form 4 |
| Feb 4, 2026 | WRB | Open-market purchaseCode P · direct | 2,585 | $69.77 | $180K@ $69.77 | 56,396,241 | Form 4 |
| Feb 3, 2026 | WRB | Open-market purchaseCode P · direct | 31,653 | $68.87 | $2.2M@ $68.87 | 56,393,656 | Form 4 |
| Feb 3, 2026 | WRB | Open-market purchaseCode P · direct | 8,347 | $67.75 | $565K@ $67.75 | 56,362,003 | Form 4 |
| Feb 2, 2026 | WRB | Open-market purchaseCode P · direct | 13,159 | $68.42 | $900K@ $68.42 | 56,353,656 | Form 4 |
| Feb 2, 2026 | WRB | Open-market purchaseCode P · direct | 237,062 | $67.71 | $16.1M@ $67.71 | 56,340,497 | Form 4 |
| Jan 30, 2026 | WRB | Open-market purchaseCode P · direct | 195,000 | $68.36 | $13.3M@ $68.36 | 56,103,435 | Form 4 |
| Jan 29, 2026 | WRB | Open-market purchaseCode P · direct | 27,718 | $68.56 | $1.9M@ $68.56 | 55,908,435 | Form 4 |
| Jan 29, 2026 | WRB | Open-market purchaseCode P · direct | 262,282 | $68.08 | $17.9M@ $68.08 | 55,880,717 | Form 4 |
| Jan 28, 2026 | WRB | Open-market purchaseCode P · direct | 28,577 | $67.89 | $1.9M@ $67.89 | 55,618,435 | Form 4 |
| Jan 28, 2026 | WRB | Open-market purchaseCode P · direct | 280,354 | $67.58 | $18.9M@ $67.58 | 55,589,858 | Form 4 |
| Jan 27, 2026 | WRB | Open-market purchaseCode P · direct | 2,671 | $69.04 | $184K@ $69.04 | 55,309,504 | Form 4 |
| Jan 27, 2026 | WRB | Open-market purchaseCode P · direct | 8,582 | $68.56 | $588K@ $68.56 | 55,306,833 | Form 4 |
| Jan 27, 2026 | WRB | Open-market purchaseCode P · direct | 325,960 | $67.40 | $22.0M@ $67.40 | 55,298,251 | Form 4 |
| Jan 27, 2026 | WRB | Open-market purchaseCode P · direct | 11,987 | $66.87 | $802K@ $66.87 | 54,972,291 | Form 4 |
| Jan 27, 2026 | WRB | Open-market purchaseCode P · direct | 800 | $65.86 | $53K@ $65.86 | 54,960,304 | Form 4 |
| Jan 26, 2026 | WRB | Open-market purchaseCode P · direct | 76,389 | $67.88 | $5.2M@ $67.88 | 54,959,504 | Form 4 |
| Jan 26, 2026 | WRB | Open-market purchaseCode P · direct | 293,611 | $66.86 | $19.6M@ $66.86 | 54,883,115 | Form 4 |
| Jan 23, 2026 | WRB | Open-market purchaseCode P · direct | 166,919 | $67.18 | $11.2M@ $67.18 | 54,589,504 | Form 4 |
| Jan 23, 2026 | WRB | Open-market purchaseCode P · direct | 201,081 | $66.77 | $13.4M@ $66.77 | 54,422,585 | Form 4 |
| Jan 22, 2026 | WRB | Open-market purchaseCode P · direct | 330,000 | $67.45 | $22.3M@ $67.45 | 54,221,504 | Form 4 |
| Jan 21, 2026 | WRB | Open-market purchaseCode P · direct | 260,998 | $67.60 | $17.6M@ $67.60 | 53,891,504 | Form 4 |
| Jan 21, 2026 | WRB | Open-market purchaseCode P · direct | 59,002 | $66.95 | $4.0M@ $66.95 | 53,630,506 | Form 4 |
| Jan 20, 2026 | WRB | Open-market purchaseCode P · direct | 44,994 | $68.08 | $3.1M@ $68.08 | 53,571,504 | Form 4 |
| Jan 20, 2026 | WRB | Open-market purchaseCode P · direct | 265,006 | $67.75 | $18.0M@ $67.75 | 53,526,510 | Form 4 |
| Jan 16, 2026 | WRB | Open-market purchaseCode P · direct | 58,691 | $68.79 | $4.0M@ $68.79 | 53,261,504 | Form 4 |
| Jan 16, 2026 | WRB | Open-market purchaseCode P · direct | 241,309 | $68.03 | $16.4M@ $68.03 | 53,202,813 | Form 4 |
| Jan 15, 2026 | WRB | Open-market purchaseCode P · direct | 68,093 | $69.45 | $4.7M@ $69.45 | 52,961,504 | Form 4 |
| Jan 15, 2026 | WRB | Open-market purchaseCode P · direct | 166,907 | $68.67 | $11.5M@ $68.67 | 52,893,411 | Form 4 |
| Jan 14, 2026 | WRB | Open-market purchaseCode P · direct | 208,272 | $69.23 | $14.4M@ $69.23 | 52,726,504 | Form 4 |
| Jan 14, 2026 | WRB | Open-market purchaseCode P · direct | 21,728 | $68.80 | $1.5M@ $68.80 | 52,518,232 | Form 4 |
| Jan 13, 2026 | WRB | Open-market purchaseCode P · direct | 206,499 | $68.15 | $14.1M@ $68.15 | 52,496,504 | Form 4 |
| Jan 13, 2026 | WRB | Open-market purchaseCode P · direct | 118,501 | $67.82 | $8.0M@ $67.82 | 52,290,005 | Form 4 |
| Jan 12, 2026 | WRB | Open-market purchaseCode P · direct | 256,041 | $68.73 | $17.6M@ $68.73 | 52,171,504 | Form 4 |
| Jan 9, 2026 | WRB | Open-market purchaseCode P · direct | 8,150 | $70.12 | $571K@ $70.12 | 51,915,463 | Form 4 |
| Jan 9, 2026 | WRB | Open-market purchaseCode P · direct | 105,674 | $69.56 | $7.4M@ $69.56 | 51,907,313 | Form 4 |
| Jan 9, 2026 | WRB | Open-market purchaseCode P · direct | 161,176 | $68.48 | $11.0M@ $68.48 | 51,801,639 | Form 4 |
| Jan 8, 2026 | WRB | Open-market purchaseCode P · direct | 151,511 | $70.32 | $10.7M@ $70.32 | 51,640,463 | Form 4 |
| Jan 8, 2026 | WRB | Open-market purchaseCode P · direct | 39,302 | $69.69 | $2.7M@ $69.69 | 51,488,952 | Form 4 |
| Jan 8, 2026 | WRB | Open-market purchaseCode P · direct | 4,187 | $68.79 | $288K@ $68.79 | 51,449,650 | Form 4 |
| Jan 7, 2026 | WRB | Open-market purchaseCode P · direct | 10,378 | $69.20 | $718K@ $69.20 | 51,445,463 | Form 4 |
| Jan 7, 2026 | WRB | Open-market purchaseCode P · direct | 254,622 | $68.47 | $17.4M@ $68.47 | 51,435,085 | Form 4 |
| Jan 6, 2026 | WRB | Open-market purchaseCode P · direct | 92,357 | $70.21 | $6.5M@ $70.21 | 51,180,463 | Form 4 |
| Jan 6, 2026 | WRB | Open-market purchaseCode P · direct | 122,931 | $69.93 | $8.6M@ $69.93 | 51,088,106 | Form 4 |
| Jan 5, 2026 | WRB | Open-market purchaseCode P · direct | 153,686 | $70.78 | $10.9M@ $70.78 | 50,965,175 | Form 4 |
| Jan 5, 2026 | WRB | Open-market purchaseCode P · direct | 35,894 | $70.23 | $2.5M@ $70.23 | 50,811,489 | Form 4 |
| Jan 5, 2026 | WRB | Open-market purchaseCode P · direct | 11,350 | $69.20 | $785K@ $69.20 | 50,775,595 | Form 4 |
| Jan 2, 2026 | WRB | Open-market purchaseCode P · direct | 237,734 | $69.35 | $16.5M@ $69.35 | 50,764,245 | Form 4 |
| Dec 31, 2025 | WRB | Open-market purchaseCode P · direct | 230,000 | $70.27 | $16.2M@ $70.27 | 50,526,511 | Form 4 |
| Dec 30, 2025 | WRB | Open-market purchaseCode P · direct | 205,000 | $70.83 | $14.5M@ $70.83 | 50,296,511 | Form 4 |
| Dec 29, 2025 | WRB | Open-market purchaseCode P · direct | 205,000 | $70.77 | $14.5M@ $70.77 | 50,091,511 | Form 4 |
| Dec 26, 2025 | WRB | Open-market purchaseCode P · direct | 220,000 | $70.56 | $15.5M@ $70.56 | 49,886,511 | Form 4 |
| Dec 24, 2025 | WRB | Open-market purchaseCode P · direct | 220,000 | $70.51 | $15.5M@ $70.51 | 49,666,511 | Form 4 |
| Dec 23, 2025 | WRB | Open-market purchaseCode P · direct | 2,027 | $71.15 | $144K@ $71.15 | 49,446,511 | Form 4 |
| Dec 23, 2025 | WRB | Open-market purchaseCode P · direct | 232,546 | $70.31 | $16.4M@ $70.31 | 49,444,484 | Form 4 |
| Dec 22, 2025 | WRB | Open-market purchaseCode P · direct | 162,060 | $70.33 | $11.4M@ $70.33 | 49,211,938 | Form 4 |
| Dec 22, 2025 | WRB | Open-market purchaseCode P · direct | 39,940 | $69.97 | $2.8M@ $69.97 | 49,049,878 | Form 4 |
| Dec 19, 2025 | WRB | Open-market purchaseCode P · direct | 204,000 | $69.50 | $14.2M@ $69.50 | 49,009,938 | Form 4 |
| Dec 18, 2025 | WRB | Open-market purchaseCode P · direct | 204,350 | $69.38 | $14.2M@ $69.38 | 48,805,938 | Form 4 |
How this page is built
Every row comes from a Form 4 filed with the SEC, which officers, directors and holders of more than 10% of a company’s stock must file within two business days of a trade. Transactions are grouped by the reporting owner’s name as filed (spacing, capitals and punctuation ignored); two different people filing under an identical name would appear together, and one person filing under two spellings appears on two pages.
Open-market totals count code P purchases and code S sales over the last 24 months. The same trade reported on more than one filing is counted once; when another owner (for example a fund and its general partner) reports the identical trade, they are listed beside it. Holdings are the shares owned after the latest purchase, sale, gift or tax-withholding line, shown separately for direct and indirect ownership; an indirect figure is one holding line, not a total across every trust or entity.
This page describes what was filed with the SEC; it is not investment advice or a recommendation to buy or sell any security.