Quick Takeaways
- MITSUI SUMITOMO INSURANCE CO LTD filed SCHEDULE 13D/A for W. R. BERKLEY CORPORATION Common Stock, par value $0.20 per share (WRB).
- Disclosed ownership: 16%.
- Date of event: 04 Mar 2026.
MITSUI SUMITOMO INSURANCE CO LTD - 04 Mar 2026 SCHEDULE 13D/A Report for W. R. BERKLEY CORPORATION Common Stock, par value $0.20 per share (WRB)
- Filing Manager
- MITSUI SUMITOMO INSURANCE CO LTD
- Reporting Manager
- Mitsui Sumitomo Insurance Co., Ltd.
- Symbol
- WRB
- Shares outstanding
- 374,397,771 shares
- Disclosed Ownership
- 58,780,450 shares
- Ownership
- 16%
- Form type
- SCHEDULE 13D/A
- Filing time
- 05 Mar 2026, 07:00:04 UTC
- Date of event
- 04 Mar 2026
- Previous filing
- 06 Feb 2026
- SEC
- View on sec.gov
Quoteable Key Fact
"MITSUI SUMITOMO INSURANCE CO LTD disclosed 16% ownership in W. R. BERKLEY CORPORATION Common Stock, par value $0.20 per share (WRB) on 04 Mar 2026."
What Changed
- Previous schedule filing date: 06 Feb 2026.
- Current filing was accepted on 05 Mar 2026, 07:00.
Why This Matters
- This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
- You can verify ownership claims directly against the original SEC filing.
Source Evidence
Backed by Schedule 13D/13G
See Original Filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting Managers (2)
| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Mitsui Sumitomo Insurance Co., Ltd. | 16% | 58,780,450 | 58,780,450 | 0 | /s/ Hironori Morimoto | Hironori Morimoto/Authorized Signatory | 0001142206 |
| MS&AD Insurance Group Holdings, Inc. | 16% | 58,780,450 | 0 | 58,780,450 | /s/ Hironori Morimoto | Hironori Morimoto/Authorized Signatory | 0001431048 |