Company: LEGT
Filing Date: 2025-11-12
Form Type: 425
Source: 0001829126-25-008967
Chunk: 0

Company: Legato Merger Corp. III
Filing Date: 2025-11-12
Form: 425
Chunk 0
---
<div align='center'>UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): November 12, 2025

Legato Merger Corp. III

(Exact Name of Registrant as Specified in Charter)</div>

| Cayman Islands               |     | 001-41945   |     | 98-1761148         |
| (State or Other Jurisdiction 
 of Incorporation)            |     | -Commission 
 File Number |     | -IRS Employer      
 Identification No. |

| 777 Third Avenue, 37th Floor, New York, New York |     |     10017 |
| (Address of Principal Executive Offices)         |     | -Zip Code |

<div align='center'>Registrant’s telephone number, including area code: (212) 319-7676

N/A

(Former Name or Former Address, if Changed Since Last Report)</div>

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

| ☒ | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425).                  |
| ☐ | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12).                 |
| ☐ | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)). |
| ☐ | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)). |

Securities registered pursuant to Section 12(b) of the Act:

| Title of each class                                                                           |     | Trading Symbol(s) |     | Name of each exchange on which registered |
| Units, each consisting of one ordinary share and one-half of one redeemable warrant           |     | LEGT U            |     | NYSE American                             |
| Ordinary shares, par value $0.0001 per share                                                  |     | LEGT              |     | NYSE American                             |
| Redeemable warrants,