Mitsui Sumitomo Insurance Co. Ltd. is 10% Owner at BERKLEY W R CORP (WRB). They have made 15 open-market trades across 1 company since 2025, most recently 2026-03-03.
CIK 0001142206
15 open-market purchases totalling $579.9M since 2025, never a sale. Across 15 scored buys the stock is down 4.9% at ninety days, and 9.3 points behind the S&P over the same stretch.
15 scored purchases · one row per filing · discretionary only
| Ticker | Shares | Value |
|---|---|---|
| WRB | 58,707,265 | $4.4B |
Shares reported on the most recent Form 4, priced at the 2026-03-03 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 47% | 40% | 7% |
| Avg Move | -0.5% | -1.8% | -4.9% |
| Alpha | -0.0% | +0.7% | -9.3% |
| Scored | 15 | 15 | 15 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| WRB | BUY | 2026-03-02 | 2026-03-03 | $72.61 | $18.7M | -5.3% | -9.2% | -11.4% |
| WRB | BUY | 2026-02-26 | 2026-02-27 | $71.65 | $21.5M | -5.1% | -7.4% | -10.1% |
| WRB | BUY | 2026-02-23 | 2026-02-25 | $71.13 | $39.4M | -5.3% | -10.2% | -6.6% |
| WRB | BUY | 2026-02-17 | 2026-02-18 | $70.92 | $40.2M | +2.5% | -8.0% | -4.1% |
| WRB | BUY | 2026-02-12 | 2026-02-13 | $70.93 | $2.8M | +1.3% | -3.0% | -6.5% |
| WRB | BUY | 2026-02-09 | 2026-02-11 | $69.68 | $6.8M | -0.2% | -4.2% | -7.3% |
| WRB | BUY | 2026-02-05 | 2026-02-06 | $70.88 | $2.8M | -0.2% | -3.2% | -5.6% |
| WRB | BUY | 2026-02-02 | 2026-02-04 | $68.05 | $21.5M | +0.6% | -0.9% | -5.8% |
| WRB | BUY | 2026-01-29 | 2026-01-30 | $68.22 | $33.1M | +4.4% | +6.9% | -2.4% |
| WRB | BUY | 2026-01-26 | 2026-01-28 | $67.35 | $69.3M | +1.6% | +5.2% | -1.6% |
| WRB | BUY | 2026-01-22 | 2026-01-23 | $67.19 | $46.9M | +3.7% | +4.9% | +1.2% |
| WRB | BUY | 2026-01-12 | 2026-01-14 | $68.58 | $55.6M | -2.8% | +0.7% | -4.7% |
| WRB | BUY | 2026-01-08 | 2026-01-09 | $69.45 | $32.6M | -1.6% | +0.9% | -2.1% |
| WRB | BUY | 2026-01-05 | 2026-01-07 | $69.61 | $47.4M | -1.6% | +2.3% | -3.1% |
| WRB | BUY | 2025-12-30 | 2026-01-02 | $70.11 | $47.2M | +0.5% | -1.5% | -4.1% |
| WRB | BUY | 2025-12-23 | 2025-12-29 | $70.49 | $94.0M | -3.3% | -4.4% | -6.4% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.