Company: TACOW
Filing Date: 2025-10-29
Form Type: 425
Source: 0001829126-25-008501
Chunk: 0

Company: Berto Acquisition Corp.
Filing Date: 2025-10-29
Form: 425
Chunk 0
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<div align='center'>UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 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): October 29, 2025

BERTO ACQUISITION CORP.

(Exact name of registrant as specified in its charter)</div>

| Cayman Islands               |     | 001-42620   |     | 99-4250815         |
| (State or other jurisdiction 
 of incorporation)            |     | -Commission 
 File Number |     | -IRS Employer      
 Identification No. |

<div align='center'>1180 North Town Center Drive, Suite 100
Las Vegas, Nevada 89144

(Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code: (702) 781-4313

Not Applicable
(Former name or former address, if changed since last report)

Securities registered pursuant to Section 12(b) of the Act:</div>

| Title of each class                                                                                  |     | Trading Symbol(s) |     | Name of each exchange on which registered |
| Units, consisting of one  ordinary share, $0.0001 par value, and one-half of one  redeemable warrant |     | TACOU             |     | The Nasdaq Stock Market LLC               |
| Ordinary shares, par value $0.0001 per share                                                         |     | TACO              |     | The Nasdaq Stock Market LLC               |
| Warrants entitling the holder to purchase one  ordinary share, par value $0.0001 per share           |     | TACOW             |     | The Nasdaq Stock Market LLC               |

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:

| ☒ | 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)) |
|