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: 14%.
- Date of event: 13 Jan 2026.
MITSUI SUMITOMO INSURANCE CO LTD - 13 Jan 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
- 379,327,367 shares
- Disclosed Ownership
- 52,726,504 shares
- Ownership
- 14%
- Form type
- SCHEDULE 13D/A
- Filing time
- 14 Jan 2026, 21:51:38 UTC
- Date of event
- 13 Jan 2026
- Previous filing
- 11 Dec 2025
- Next filing
- 06 Feb 2026
- SEC
- View on sec.gov
Quoteable Key Fact
"MITSUI SUMITOMO INSURANCE CO LTD disclosed 14% ownership in W. R. BERKLEY CORPORATION Common Stock, par value $0.20 per share (WRB) on 13 Jan 2026."
What Changed
- Previous schedule filing date: 11 Dec 2025.
- Current filing was accepted on 14 Jan 2026, 21:51.
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.
Official SEC Source
Backed by Schedule 13D/13G
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
See Original FilingReporting Managers (2)
| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Mitsui Sumitomo Insurance Co., Ltd. | 14% | 52,726,504 | 52,726,504 | 0 | /s/ Hironori Morimoto | Hironori Morimoto/Authorized Signatory | 0001142206 |
| MS&AD Insurance Group Holdings, Inc. | 14% | 52,726,504 | 0 | 52,726,504 | /s/ Hironori Morimoto | Hironori Morimoto/Authorized Signatory | 0001431048 |