Legato Merger Corp. IV Schedule 13G: Adage Capital Management, L.P. and affiliated reporting persons disclose beneficial ownership of 1,800,000 Ordinary Shares of Legato Merger Corp. IV, representing 5.76% of the class based on 31,266,667 Ordinary Shares outstanding as of February 26, 2026.
The filing states the shares are directly held by Adage Capital Partners, L.P. and that the Reporting Persons have shared voting power and shared dispositive power over the 1,800,000 shares. Signatures are dated 05/13/2026.
Positive
None.
Negative
None.
Insights
Filing documents a passive >5% beneficial stake held through fund structures.
The statement shows Adage Capital Management, L.P. and affiliated individuals reporting beneficial ownership of 1,800,000 shares, or 5.76%, calculated from an outstanding base of 31,266,667 Ordinary Shares as of February 26, 2026. The filing is a Schedule 13G disclosure, consistent with passive or qualifying institutional investor reporting.
Key dependencies are the reported outstanding share count and the fund relationship described; any change in classification or increased activity would require alternative reporting. Subsequent filings will show changes in ownership or voting authority.
Reports clarify who holds and controls the disclosed stake.
The filing attributes the shares to Adage Capital Partners, L.P. and names Robert Atchinson and Phillip Gross as related reporting persons with shared voting and dispositive power over the 1,800,000 shares. The percentage uses the Company’s reported outstanding share figure from the Form 10-Q.
For market participants, this establishes a visible institutional ownership slice; any material change in voting or disposition authority would be reflected in future Section 13 filings. Timing of changes is not specified in the excerpt.
Key Figures
Reported shares beneficially owned:1,800,000 sharesPercent of class:5.76%Shares outstanding used:31,266,667 Ordinary Shares+2 more
5 metrics
Reported shares beneficially owned1,800,000 sharesDirectly held by Adage Capital Partners, L.P.
Percent of class5.76%Calculated on 31,266,667 Ordinary Shares outstanding as of Feb 26, 2026
Shares outstanding used31,266,667 Ordinary SharesOutstanding as of <date>February 26, 2026</date> (source: company Form 10-Q)
Signature date05/13/2026Date the Schedule 13G was signed
CUSIPG7318R105Legato Merger Corp. IV Ordinary Shares
Key Terms
Schedule 13G, shared dispositive power, beneficial ownership, Form 10-Q reference
4 terms
Schedule 13Gregulatory
"Item 1. (a) Name of issuer: Legato Merger Corp. (b) ..."
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.
shared dispositive powerregulatory
"Shared Dispositive Power 1,800,000.00"
beneficial ownershipfinancial
"Amount beneficially owned: The information required by Item 4(a) is set forth in Row 9"
Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.
Form 10-Q referenceregulatory
"as reported in the Company's Quarterly Report on Form 10-Q for the quarterly period ended November 30, 2025"
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
Legato Merger Corp. IV
(Name of Issuer)
Ordinary shares, par value $0.0001 per share
(Title of Class of Securities)
G7318R105
(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):
G7318R105
1
Names of Reporting Persons
Adage Capital Management, L.P.
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
1,800,000.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
1,800,000.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,800,000.00
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)
5.76 %
12
Type of Reporting Person (See Instructions)
IA, PN
SCHEDULE 13G
CUSIP Number(s):
G7318R105
1
Names of Reporting Persons
Robert Atchinson
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
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
1,800,000.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
1,800,000.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,800,000.00
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)
5.76 %
12
Type of Reporting Person (See Instructions)
HC, IN
SCHEDULE 13G
CUSIP Number(s):
G7318R105
1
Names of Reporting Persons
Phillip Gross
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
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
1,800,000.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
1,800,000.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,800,000.00
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)
5.76 %
12
Type of Reporting Person (See Instructions)
HC, IN
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
Legato Merger Corp. IV
(b)
Address of issuer's principal executive offices:
777 Third Avenue, 37th Floor, New York, NY 10017
Item 2.
(a)
Name of person filing:
This statement is filed by:
(i) Adage Capital Management, L.P., a Delaware limited partnership ("ACM"), as the investment manager of Adage Capital Partners, L.P., a Delaware limited partnership ("ACP"), with respect to the ordinary shares, par value $0.0001 per share ("Ordinary Shares") of Legato Merger Corp. IV, a Cayman Islands exempted company (the "Company") directly held by ACP;
(ii) Robert Atchinson ("Mr. Atchinson"), as (1) managing member of Adage Capital Advisors, L.L.C., a limited liability company organized under the laws of the State of Delaware ("ACA"), managing member of Adage Capital Partners GP, L.L.C., a limited liability company organized under the laws of the State of Delaware ("ACPGP"), general partner of ACP, and (2) managing member of Adage Capital Partners, L.L.C., a Delaware limited liability company ("ACPLLC"), general partner of ACM, with respect to the Ordinary Shares directly held by ACP; and
(iii) Phillip Gross ("Mr. Gross"), as (1) managing member of ACA, managing member of ACPGP, and (2) managing member of ACPLLC, general partner of ACM, with respect to the Ordinary Shares directly held by ACP.
The foregoing persons are hereinafter sometimes collectively referred to as the "Reporting Persons." Any disclosures herein with respect to persons other than the Reporting Persons are made on information and belief after making inquiry to the appropriate party.
The filing of this statement should not be construed in and of itself as an admission by any Reporting Person as to beneficial ownership of the securities reported herein.
(b)
Address or principal business office or, if none, residence:
The address of the business office of each of the Reporting Persons is 200 Clarendon Street, 52nd Floor, Boston, Massachusetts 02116.
(c)
Citizenship:
ACM is a limited partnership organized under the laws of the State of Delaware. Messrs. Gross and Atchinson are citizens of the United States.
(d)
Title of class of securities:
Ordinary shares, par value $0.0001 per share
(e)
CUSIP Number(s):
G7318R105
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:
The information required by Item 4(a) is set forth in Row 9 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
The percentage set forth in this Schedule 13G is calculated based upon an aggregate of 31,266,667 Ordinary Shares outstanding as of February 26, 2026, as reported in the Company's Quarterly Report on Form 10-Q for the quarterly period ended November 30, 2025, filed with the Securities and Exchange Commission on February 26, 2026.
(b)
Percent of class:
5.76%
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
The information required by Item 4(c)(i) is set forth in Row 5 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
(ii) Shared power to vote or to direct the vote:
The information required by Item 4(c)(ii) is set forth in Row 6 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
(iii) Sole power to dispose or to direct the disposition of:
The information required by Item 4(c)(iii) is set forth in Row 7 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
(iv) Shared power to dispose or to direct the disposition of:
The information required by Item 4(c)(iv) is set forth in Row 8 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
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.
If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.
See Item 2(a).
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
Not Applicable
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.
Adage Capital Management, L.P.
Signature:
/s/ Robert Atchinson
Name/Title:
By: Adage Capital Partners, L.L.C., its General Partner, By: Robert Atchinson, its Managing Member
Adage reports beneficial ownership of 1,800,000 Ordinary Shares, equal to 5.76% of the class calculated on 31,266,667 Ordinary Shares outstanding as of February 26, 2026.
Who is the legal owner of the shares reported for LEGO?
Adage Capital Partners, L.P. is identified as the direct holder; Adage Capital Management, L.P., Robert Atchinson, and Phillip Gross file as Reporting Persons with shared powers over those shares.
What voting and disposition powers are disclosed in the LEGO filing?
The filing shows shared voting power and shared dispositive power of 1,800,000 shares among the Reporting Persons; sole voting or dispositive powers are reported as zero on the cover data.
Which outstanding share count does the LEGO percentage use?
The 5.76% figure is calculated using 31,266,667 Ordinary Shares outstanding as of February 26, 2026, cited from the company’s Form 10-Q for the period ended November 30, 2025.
When was the Schedule 13G for LEGO signed?
The signatures on the filing are dated 05/13/2026, and the ownership percentage references the outstanding share count as of February 26, 2026.
