W.R. Berkley (NYSE: WRB) discloses 997,282 shares (9.4%) in CAPN

Rhea-AI Filing Summary

CAYSON ACQUISITION CORP ownership disclosure: W.R. Berkley Corporation reports beneficial ownership of 997,282 ordinary shares, representing 9.4% of the class as of 03/31/2026, via shared voting and dispositive power. The filing is Amendment No. 1 and lists Berkley Insurance Company as the subsidiary holding the shares.

Insights

Corporate Governance Analyst

Non‑control stake disclosed: 9.4% ownership with shared voting power.

W.R. Berkley Corporation reports 997,282 shares (9.4%) with shared voting and shared dispositive power, indicating the position is held through an affiliated entity rather than sole control. The filing is an amended Schedule 13G, which is typically used for passive or qualifying owners.

Future filings could show changes if the holder increases above 10% or changes from passive to active status; timing and intent are not stated in the excerpt.

Investor Relations Specialist

Disclosure clarifies steady sizable stake but not an activating intent.

The Schedule 13G/A amendment identifies the subsidiary Berkley Insurance Company as the reporting holder and attributes shared powers of 997,282 shares. This documents ownership rather than announcing transactions or strategic plans.

Market impact depends on future disclosures; current filing provides a snapshot as of 03/31/2026.

Key Figures

Beneficial ownership: 997,282 shares Percent of class: 9.4% Shared voting power: 997,282 shares +1 more

4 metrics

Beneficial ownership 997,282 shares as of 03/31/2026

Percent of class 9.4% reported stake in Ordinary Shares

Shared voting power 997,282 shares number with shared voting rights

Shared dispositive power 997,282 shares number with shared dispositive rights

Key Terms

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

3 terms

Schedule 13G/A regulatory

"Amendment No. 1 schedule filing reporting beneficial ownership"

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 regulatory

"Amount beneficially owned: 997,282 (b) Percent of class: 9.4%"

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 regulatory

"Shared Dispositive Power 997,282.00"

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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

CAYSON ACQUISITION CORP

(Name of Issuer)

Ordinary Shares, par value $0.0001 per share

(Title of Class of Securities)

G1993W109

(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): G1993W109

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 997,282.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 997,282.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

997,282.00

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)

9.4 %

12

Type of Reporting Person (See Instructions)

CO

SCHEDULE 13G

CUSIP Number(s): G1993W109

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 997,282.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 997,282.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

997,282.00

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)

9.4 %

12

Type of Reporting Person (See Instructions)

CO, IC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: CAYSON ACQUISITION CORP
(b)	Address of issuer's principal executive offices: 205 W 37th St, New York, New York, 10018
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: Ordinary Shares, par value $0.0001 per share
(e)	CUSIP No.: G1993W109
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: 997,282
(b)	Percent of class: 9.4 %
(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: 997,282
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 997,282
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 Corporation disclose in CAYSON ACQUISITION CORP (CAPN)?

W.R. Berkley Corporation reports beneficial ownership of 997,282 ordinary shares, equal to 9.4% of the class as of 03/31/2026. The position is reported under an amended Schedule 13G.

Does the filing show W.R. Berkley has sole voting control of CAPN shares?

No. The filing shows 0 shares with sole voting power and 997,282 shares with shared voting power, indicating shared rather than sole control of voting rights.

Which subsidiary is identified as holding the CAPN shares?

The filing lists Berkley Insurance Company as the subsidiary associated with the reported holdings and attributes the shared voting and dispositive powers to that entity.

What does Amendment No. 1 indicate in this Schedule 13G/A?

Amendment No. 1 signals an update to a prior Schedule 13G filing; this amended filing restates ownership details, showing 997,282 shares and the classification of the holder as of 03/31/2026.

Is this filing an indication of an active acquisition or takeover attempt?

This filing discloses ownership only and does not state intent to influence control. It is a Schedule 13G/A disclosure reflecting a 9.4% passive/qualifying position as reported.