W. R. Berkley (HYAC) discloses 8.4% ownership in Haymaker Acquisition Corp. 4

Rhea-AI Filing Summary

W. R. Berkley Corporation, through subsidiary Berkley Insurance Company, reports beneficial ownership of 1,964,207 Class A ordinary shares of Haymaker Acquisition Corp. 4, representing 8.4% of the class as of the stated event date.

The filing shows shared voting and dispositive power over all 1,964,207 shares and no sole voting or dispositive power. The certifying executive states the securities were acquired and are held in the ordinary course of business and not for the purpose of changing or influencing control of the issuer.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

HAYMAKER ACQUISITION CORP. 4

(Name of Issuer)

Class A Ordinary Shares, par value $0.0001 per share

(Title of Class of Securities)

G4375F108

(CUSIP Number)

12/31/2025

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No. G4375F108

1

Names of Reporting Persons

W. R. Berkley Corporation

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,964,207.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,964,207.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,964,207.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

8.4 %

12

Type of Reporting Person (See Instructions)

CO

SCHEDULE 13G

CUSIP No. G4375F108

1

Names of Reporting Persons

Berkley Insurance Company

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,964,207.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,964,207.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,964,207.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

8.4 %

12

Type of Reporting Person (See Instructions)

CO, IC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: HAYMAKER ACQUISITION CORP. 4
(b)	Address of issuer's principal executive offices: 501 MADISON AVENUE, FLOOR 5, New York, NY, 10022
Item 2.
(a)	Name of person filing: W. R. Berkley Corporation
(b)	Address or principal business office or, if none, residence: 475 Steamboat Road Greenwich, CT 06830
(c)	Citizenship: US
(d)	Title of class of securities: Class A Ordinary Shares, par value $0.0001 per share
(e)	CUSIP No.: G4375F108
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 1,964,207
(b)	Percent of class: 8.4 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 1,964,207
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 1,964,207
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See Exhibit 99.1
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

W. R. Berkley Corporation

Signature:	/s/ Richard M. Baio
Name/Title:	Richard M. Baio/Executive Vice President and Chief Financial Officer
Date:	02/10/2026

Berkley Insurance Company

Signature:	/s/ Richard M. Baio
Name/Title:	Richard M. Baio/Executive Vice President and Treasurer
Date:	02/10/2026

FAQ

What percentage of Haymaker Acquisition Corp. 4 (HYAC) does W. R. Berkley own?

W. R. Berkley Corporation reports beneficial ownership of 8.4% of Haymaker Acquisition Corp. 4’s Class A ordinary shares. This corresponds to 1,964,207 shares with shared voting and shared dispositive power over the entire reported position.

How many HYAC Class A shares does W. R. Berkley report on this Schedule 13G/A?

The filing reports beneficial ownership of 1,964,207 Class A ordinary shares of Haymaker Acquisition Corp. 4. All of these shares are reported with shared voting power and shared dispositive power, and no shares are held with sole voting or dispositive authority.

Which entities are the reporting persons for this HYAC Schedule 13G/A?

The reporting persons are W. R. Berkley Corporation and its subsidiary Berkley Insurance Company. Both entities report beneficial ownership of the same 1,964,207 Class A ordinary shares, representing 8.4% of Haymaker Acquisition Corp. 4’s outstanding class.

Does W. R. Berkley hold HYAC shares to influence control of the company?

The certification states the HYAC securities were acquired and are held in the ordinary course of business and not for the purpose of changing or influencing control, nor in connection with any transaction having that control-related purpose or effect.

What voting and dispositive powers are reported over HYAC shares in this filing?

The reporting persons disclose 0 shares with sole voting or sole dispositive power and 1,964,207 shares with shared voting power and shared dispositive power. This structure means decisions over these shares are made on a shared rather than individual basis.

Who signed the HYAC Schedule 13G/A on behalf of W. R. Berkley?

The filing is signed by Richard M. Baio, identified as Executive Vice President and Chief Financial Officer, and also as Executive Vice President and Treasurer, each signature dated 02/10/2026, certifying the accuracy of the ownership information provided.