Company: FGMCU
Filing Date: 2025-08-22
Form Type: 425
Source: 0001104659-25-081879
Chunk: 0

Company: FG Merger II Corp.
Filing Date: 2025-08-22
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

August 22, 2025

Date of Report (Date of earliest event reported)

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 No. |

| 104 S. Walnut Street, Unit 1A,           
 Itasca, IL                               |     |     60143 |
| (Address of Principal Executive Offices) |     | -Zip Code |

<div align='center'>Registrant’s telephone number, including
area code: ( 847) 751-9017

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 |

| ¨ | Soliciting material pursuant to Rule 14a-12 under the Exchange Act |

| ¨ | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act |

| ¨ | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act |

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

| 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 (17 CFR §230.405) or Rule 12b-2 of the Securities
Exchange Act of 1934