Sec Form 13D Filing - Mitsui Sumitomo Insurance Co., Ltd. filing for - 2026-03-05

Insider filing report for Changes in Beneficial Ownership

  • Schedule 13G & 13D forms are used to report a party's ownership of stock which exceeds 5% of a company's total stock issue.
  • Schedule 13G is a shorter version of Schedule 13D with fewer reporting requirements.
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If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box. Checkbox not checked

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).






SCHEDULE 13D



Comment for Type of Reporting Person:
The aggregate amount in row (11) does not reflect shares of common stock, par value $0.20 per share (the "Common Stock"), of W. R. Berkley Corporation (the "Issuer") held by WR Berkley & Others LLC ("Family Holdings"), as further described in Items 5(a) and 6. Percentages are based on 374,490,856 shares of Common Stock outstanding as of February 23, 2026, as reported in the Issuer's Form 10-K filed with the Securities and Exchange Commission on February 27, 2026.


SCHEDULE 13D



Comment for Type of Reporting Person:
The aggregate amount in row (11) does not reflect shares of Common Stock held by Family Holdings, as further described in Items 5(a) and 6. Percentages are based on 374,490,856 shares of Common Stock outstanding as of February 23, 2026, as reported in the Issuer's Form 10-K filed with the Securities and Exchange Commission on February 27, 2026.


SCHEDULE 13D

 
Mitsui Sumitomo Insurance Co., Ltd.
 
Signature:/s/ Hironori Morimoto
Name/Title:Hironori Morimoto/Authorized Signatory
Date:03/05/2026
 
MS&AD Insurance Group Holdings, Inc.
 
Signature:/s/ Hironori Morimoto
Name/Title:Hironori Morimoto/Authorized Signatory
Date:03/05/2026
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