Company: FGMCU
Filing Date: 2025-11-04
Form Type: 425
Source: 0001104659-25-105938
Chunk: 0

Company: FG Merger II Corp.
Filing Date: 2025-11-04
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): November 3, 2025

FG MERGER II CORP.

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

| Nevada                          |     | 001-42493               |     | 86-2579471            |
| (State or other jurisdiction of 
 incorporation)                  |     | -Commission File Number |     | -I.R.S. Employer      
 Identification Number |

<div align='center'>104 S. Walnut Street, Unit 1A

Itasca, IL60143

(Address of principal executive offices)

(847) 751-9017

(Registrant’s telephone number, including area code)

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:

| x | 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))                                  |

| Title of each class |     | Trading   
 Symbol(s) |     | Name of each exchange       
 on which registered         |
| Common Stock        |     | FGMC      |     | THE NASDAQ STOCK MARKET LLC |
| Rights              |     | FGMCR     |     | THE NASDAQ STOCK MARKET LLC |
| Units               |     | FGMCU     |     | THE NASDAQ STOCK MARKET LLC |

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule
12b-2 of the Securities