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[Form 4] BERKLEY W R CORP Insider Trading Activity

Filing Impact
(Very High)
Filing Sentiment
(Very Positive)
Form Type
4

Rhea-AI Filing Summary

Mitsui Sumitomo Insurance Co., Ltd., a 10% owner of W. R. Berkley Corporation, reported open-market purchases of the issuer’s common stock on January 8 and 9, 2026 under a Rule 10b5-1 purchase plan adopted on October 3, 2025. On those dates, Mitsui Sumitomo bought several blocks of shares at weighted average prices ranging from about $68.48 to $70.32 per share. Following the final reported trade, the filing shows 51,915,463 shares of W. R. Berkley common stock beneficially owned in direct form. Because Mitsui Sumitomo is a wholly owned subsidiary of MS&AD Insurance Group Holdings, Inc., MS&AD may be deemed to beneficially own these securities but expressly disclaims beneficial ownership except to the extent of its pecuniary interest.

Positive

  • None.

Negative

  • None.
Insider MITSUI SUMITOMO INSURANCE CO LTD, MS&AD Insurance Group Holdings, Inc.
Role 10% Owner | 10% Owner
Bought 470,000 shs ($32.64M)
Type Security Shares Price Value
Purchase Common Stock 161,176 $68.4816 $11.04M
Purchase Common Stock 105,674 $69.5648 $7.35M
Purchase Common Stock 8,150 $70.1162 $571K
Purchase Common Stock 4,187 $68.7913 $288K
Purchase Common Stock 39,302 $69.6902 $2.74M
Purchase Common Stock 151,511 $70.3161 $10.65M
Holdings After Transaction: Common Stock — 51,801,639 shares (Direct)
Footnotes (1)
  1. The purchases reported on this Form 4 were effected pursuant to a Rule 10b5-1 purchase plan, adopted October 3, 2025. The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $68.445 to $68.995. The Reporting Persons undertake to provide to W.R. Berkley Corporation (the "Issuer"), any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote and in footnotes 4, 5, 6, 7 and 8. The shares are held directly by Mitsui Sumitomo Insurance Co., Ltd. ("MSI"). Because MSI is a wholly-owned subsidiary of MS&AD Insurance Group Holdings, Inc. ("MS&AD"), MS&AD may be deemed to beneficially own the reported securities. MS&AD expressly disclaims beneficial ownership of the reported securities, except to the extent of its pecuniary interest therein. The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $69.0527 to $69.995. The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $70.00 to $70.555. The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $68.36 to $68.9975. The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $69.00 to $69.9974. The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $70.0011 to $70.4398.
Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number: 3235-0287
Estimated average burden
hours per response: 0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
X
 Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
MITSUI SUMITOMO INSURANCE CO LTD
(Last) (First) (Middle)
9, KANDA-SURUGADAI 3-CHOME, CHIYODA-KU
(Street)
TOKYO M0
(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
BERKLEY W R CORP [ WRB ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director X 10% Owner
Officer (give title below) Other (specify below)
3. Date of Earliest Transaction (Month/Day/Year)
01/08/2026
4. If Amendment, Date of Original Filed (Month/Day/Year)
 6. Individual or Joint/Group Filing (Check Applicable Line)
Form filed by One Reporting Person
X Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 01/08/2026 P(1) 4,187 A $68.7913(2) 51,449,650 D(3)
Common Stock 01/08/2026 P(1) 39,302 A $69.6902(4) 51,488,952 D(3)
Common Stock 01/08/2026 P(1) 151,511 A $70.3161(5) 51,640,463 D(3)
Common Stock 01/09/2026 P(1) 161,176 A $68.4816(6) 51,801,639 D(3)
Common Stock 01/09/2026 P(1) 105,674 A $69.5648(7) 51,907,313 D(3)
Common Stock 01/09/2026 P(1) 8,150 A $70.1162(8) 51,915,463 D(3)
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
1. Name and Address of Reporting Person*
MITSUI SUMITOMO INSURANCE CO LTD
(Last) (First) (Middle)
9, KANDA-SURUGADAI 3-CHOME, CHIYODA-KU
(Street)
TOKYO M0
(City) (State) (Zip)
Relationship of Reporting Person(s) to Issuer
Director X 10% Owner
Officer (give title below) Other (specify below)
1. Name and Address of Reporting Person*
MS&AD Insurance Group Holdings, Inc.
(Last) (First) (Middle)
TOKYO SUMITOMO TWIN BUILDING WEST TOWER,
27-2, SHINKAWA 2-CHOME, CHUO-KU,
(Street)
TOKYO M0
(City) (State) (Zip)
Relationship of Reporting Person(s) to Issuer
Director X 10% Owner
Officer (give title below) Other (specify below)
Explanation of Responses:
1. The purchases reported on this Form 4 were effected pursuant to a Rule 10b5-1 purchase plan, adopted October 3, 2025.
2. The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $68.445 to $68.995. The Reporting Persons undertake to provide to W.R. Berkley Corporation (the "Issuer"), any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote and in footnotes 4, 5, 6, 7 and 8.
3. The shares are held directly by Mitsui Sumitomo Insurance Co., Ltd. ("MSI"). Because MSI is a wholly-owned subsidiary of MS&AD Insurance Group Holdings, Inc. ("MS&AD"), MS&AD may be deemed to beneficially own the reported securities. MS&AD expressly disclaims beneficial ownership of the reported securities, except to the extent of its pecuniary interest therein.
4. The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $69.0527 to $69.995.
5. The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $70.00 to $70.555.
6. The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $68.36 to $68.9975.
7. The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $69.00 to $69.9974.
8. The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $70.0011 to $70.4398.
Remarks:
MSI, the Issuer and WR Berkley & Others LLC ("WRBO") are party to certain agreements described in, and filed as exhibits to, the Reporting Persons' Schedule 13D filed with the U.S. Securities and Exchange Commission on December 11, 2025. The Reporting Persons disclaim beneficial ownership of the securities of the Issuer owned by WRBO and disclaim that the Reporting Persons and WRBO constitute a "group" within the meaning of Rule 13d-5(b)(1) under the Securities Exchange Act of 1934, as amended.
MITSUI SUMITOMO INSURANCE CO., LTD., By: /s/ Hironori Morimoto, Name: Hironori Morimoto, Title: Authorized Signatory 01/09/2026
MS&AD INSURANCE GROUP HOLDINGS, INC., By: /s/ Hironori Morimoto, Name: Hironori Morimoto, Title: Authorized Signatory 01/09/2026
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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Source: View Original Filing on SEC EDGAR