W.R. Berkley reports 2.32M shares in Haymaker Acquisition Corp. 4 (HYAC)

Rhea-AI Filing Summary

W. R. Berkley Corporation reported beneficial ownership of 2,321,633 Class A ordinary shares of Haymaker Acquisition Corp. 4, representing 9.9% of the class as of 03/31/2026. The filing (Amendment No. 2) shows shared voting and shared dispositive power over these shares.

Insights

Institutional Ownership Analyst

Institution holds a sub-10% stake with shared control over 2.32M shares.

W. R. Berkley Corporation's Schedule 13G/A shows beneficial ownership of 2,321,633 shares, equating to 9.9% of the Class A ordinary shares as of 03/31/2026. The filing attributes shared voting and shared dispositive power to the filer, indicating control is exercised jointly with another listed entity.

This is a disclosure of passive/large-holder ownership; cash-flow treatment and selling intent are not stated in the excerpt. Subsequent filings would report changes to holdings or voting arrangements.

Key Figures

Beneficial ownership: 2,321,633 shares Percent of class: 9.9% Shared voting power: 2,321,633 shares +1 more

4 metrics

Beneficial ownership 2,321,633 shares Class A ordinary shares as of 03/31/2026

Percent of class 9.9% Percentage of Class A ordinary shares as reported

Shared voting power 2,321,633 shares Shared power to vote or direct the vote reported in Item 4

Shared dispositive power 2,321,633 shares Shared power to dispose or direct disposition reported in Item 4

Key Terms

Schedule 13G/A, beneficially owned, shared dispositive power

3 terms

Schedule 13G/A regulatory

"Item 1. (a) Name of issuer: HAYMAKER ACQUISITION CORP. 4"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

beneficially owned financial

"Item 4. (a) Amount beneficially owned: 2,321,633"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

shared dispositive power governance

"Item 4. (iv) Shared power to dispose or to direct the disposition of: 2,321,633"

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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 2)

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)

03/31/2026

(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)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 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 2,321,633.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,321,633.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,321,633.00

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)

9.9 %

12

Type of Reporting Person (See Instructions)

CO

SCHEDULE 13G

CUSIP Number(s): 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 2,321,633.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,321,633.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,321,633.00

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)

9.9 %

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: 324 Royal Palm Way, Suite 300-i, Palm Beach, Florida, 33480
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: 2,321,633
(b)	Percent of class: 9.9 %
(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: 2,321,633
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 2,321,633
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:	05/07/2026

Berkley Insurance Company

Signature:	/s/ Richard M. Baio
Name/Title:	Richard M. Baio/Executive Vice President and Treasurer
Date:	05/07/2026

FAQ

What stake does W.R. Berkley Corp. report in HYAC?

W.R. Berkley Corporation reports beneficial ownership of 2,321,633 shares. The filing states this equals 9.9% of Haymaker Acquisition Corp. 4's Class A shares as of 03/31/2026, with shared voting and dispositive power over the shares.

Does the Schedule 13G/A show who holds voting power for HYAC shares?

The filing shows shared voting power and shared dispositive power. Specifically, W.R. Berkley Corporation reports 0 sole voting power and 2,321,633 shared voting power for the Class A ordinary shares in the schedule.

Is W.R. Berkley the sole owner of the reported HYAC shares?

No — the filing indicates shared ownership control. The Schedule 13G/A lists shared voting and shared dispositive power of 2,321,633 shares, and records 0 sole voting or dispositive power for the filer.

What date is the ownership percentage in the HYAC filing based on?

The ownership figures are reported as of 03/31/2026. The Schedule 13G/A amendment cites that date alongside the share count of 2,321,633, which the filer states represents 9.9% of the class.

Who signed the Schedule 13G/A for W.R. Berkley on the HYAC filing?

The filing is signed by Richard M. Baio. The document shows two signatures listing Richard M. Baio as Executive Vice President and Chief Financial Officer and as Executive Vice President and Treasurer, each dated 05/07/2026.