W. R. Berkley Corporation (WRB) ownership: Top institutional holder: Mitsui Sumitomo Insurance Co Ltd ($3.90B). Insider activity: Net Seller (0 buys, 8 sells). 10 recent congressional STOCK Act disclosures. SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| Mitsui Sumitomo Insurance Co Ltd | 58780450.00 | $3.90B | 2026-03-31 |
| VANGUARD GROUP INC | 37033581.00 | $2.60B | 2025-12-31 |
| BlackRock, Inc. | 23280608.00 | $1.54B | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 18925841.00 | $1.25B | 2026-03-31 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 14750233.00 | $977.65M | 2026-03-31 |
| STATE STREET CORP | 14405410.00 | $954.79M | 2026-03-31 |
| MORGAN STANLEY | 10412465.00 | $690.14M | 2026-03-31 |
| GEODE CAPITAL MANAGEMENT, LLC | 8229654.00 | $549.20M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-08-03 | |
| Sell | null | 2026-08-03 | |
| Sell | null | 2026-08-03 | |
| Sell | null | 2026-08-03 | |
| Sell | null | 2026-08-03 | |
| Sell | null | 2026-08-03 | |
| Sell | null | 2026-08-03 | |
| Sell | null | 2026-08-03 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.