W.R. Berkley files 5.7% stake in LEGATO Merger III

Rhea-AI Filing Summary

LEGATO MERGER CORP. III reports that W. R. Berkley Corporation beneficially owns 1,466,215 ordinary shares, representing 5.7% of the class. The filing lists shared voting and shared dispositive power over the 1,466,215 shares.

The Schedule 13G identifies Berkley Insurance Company as holding the same 1,466,215 shares and is signed by Richard M. Baio on 05/07/2026.

Insights

Institutional Ownership Analyst

W.R. Berkley reports a 5.7% beneficial stake in LEGT.

The Schedule 13G shows 1,466,215 shares beneficially owned with shared voting and dispositive power. This is a passive reporting form typically used when an investor holds a non‑control stake and does not seek to influence governance.

Watch subsequent filings for any change in status or a switch to an active filing form; timing and cash‑flow treatment are not stated in the excerpt.

Corporate Governance Specialist

Shared power indicates ownership via affiliated entities rather than sole control.

The report attributes identical 1,466,215 shares to both W.R. Berkley Corporation and Berkley Insurance Company, listing shared voting/dispositive power. This pattern commonly reflects holdings routed through subsidiaries or pooled accounts.

Any governance implications depend on whether the position is passive; the Schedule 13G classification suggests passive intent in this filing.

Key Figures

Beneficial ownership: 1,466,215 shares Percent of class: 5.7% CUSIP: G5451A103 +1 more

4 metrics

Beneficial ownership 1,466,215 shares Amount beneficially owned as reported on the Schedule 13G

Percent of class 5.7% Percent of class corresponding to 1,466,215 shares

CUSIP G5451A103 CUSIP for LEGATO MERGER CORP. III ordinary shares

Signature date 05/07/2026 Filing signed by Richard M. Baio

Key Terms

Schedule 13G, Beneficially owned, Shared dispositive power

3 terms

Schedule 13G regulatory

"Item 1. (a) Name of issuer: LEGATO MERGER CORP. III"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

Beneficially owned financial

"Item 4. (a) Amount beneficially owned: 1,466,215"

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

"Item 4. (iv) Shared power to dispose or to direct the disposition of: 1,466,215"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What stake does W.R. Berkley hold in LEGATO MERGER CORP. III (LEGT)?

W.R. Berkley beneficially owns 1,466,215 shares, equal to 5.7% of the class. The Schedule 13G discloses shared voting and dispositive power over these shares, filed and signed on 05/07/2026.

Does the filing show who controls the voting of those LEGT shares?

The filing shows shared voting power of 1,466,215 shares and no sole voting power. This indicates voting authority is shared among the reporting entities rather than held solely by one party.

Which entities are named as beneficial owners of LEGT shares in this filing?

The Schedule 13G lists W. R. Berkley Corporation and Berkley Insurance Company with identical beneficial ownership of 1,466,215 shares and 5.7% of the class, per the provided excerpt.

What filing type was used to report the LEGT ownership and what does it signify?

The ownership is reported on a Schedule 13G, which typically signals a passive investor reporting beneficial ownership under applicable rules rather than an active acquisition or control intent.

When was the Schedule 13G for LEGT signed and by whom?

The excerpt shows signatures by Richard M. Baio in the capacities of Executive Vice President and Chief Financial Officer and Treasurer, dated 05/07/2026.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/08/2026 - 09:05 AM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

LEGATO MERGER CORP. III

(Name of Issuer)

Ordinary shares, par value $0.0001 per share

(Title of Class of Securities)

G5451A103

(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): G5451A103

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 1,466,215.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,466,215.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,466,215.00

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)

5.7 %

12

Type of Reporting Person (See Instructions)

CO

SCHEDULE 13G

CUSIP Number(s): G5451A103

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 1,466,215.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,466,215.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,466,215.00

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)

5.7 %

12

Type of Reporting Person (See Instructions)

CO, IC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: LEGATO MERGER CORP. III
(b)	Address of issuer's principal executive offices: 777 Third Avenue, 37th Floor, New York, New York, 10017
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 Number(s): G5451A103
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: 1,466,215
(b)	Percent of class: 5.7 %
(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: 1,466,215
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 1,466,215
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