Company: FGMCU
Filing Date: 2025-12-30
Form Type: S-4/A
Source: 0001104659-25-124947
Chunk: 737

Company: FG Merger II Corp.
Filing Date: 2025-12-30
Form: S-4/A
Chunk 737
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 Officer |

| ​ | FG MERGER SUB II INC. |                     |                         |
| ​ | ​                     |                     |                         |
| ​ | By:                   | /s/ Hassan R. Baqar |                         |
| ​ | ​                     | Name:               | Hassan R. Baqar         |
| ​ | ​                     | Title:              | Chief Executive Officer |

| ​ | BOXABL INC. |                      |                            |
| ​ | ​           |                      |                            |
| ​ | By:         | /s/ Galiano Tiramini |                            |
| ​ | ​           | Name:                | Galiano Tiramini           |
| ​ | ​           | Title:               | co-Chief Executive Officer |

[Signature Page to Agreement and Plan of Merger]

A-61

<div align='center'>Exhibit A-1

Form of Company Lock-Up Agreement

A-62</div>

#### Exhibit A-2​Form of Sponsor Lock-Up Agreement​

#### A-63
<div align='center'>FIRST AMENDMENT TO AGREEMENT AND PLAN OF MERGER</div>

THIS FIRST AMENDMENT TO THE AGREEMENT AND PLAN OF MERGER (this “Amendment”) is made and entered into as of November 3, 2025, by and amongFG MERGER II CORP.,a Nevada corporation (“Acquiror”),FG MERGER SUB II INC.,a Nevada corporation (“Merger Sub”), andBOXABL INC.,a Nevada corporation (the “Company”). Acquiror, Merger Sub and the Company are sometimes referred to collectively in this Amendment as the “Parties.”

<div align='center'>RECITALS</div>

A.The Parties entered into that certain Agreement and Plan of Merger, dated as of August 4, 2025 (the “Agreement”).

B.The Parties desire to modify the terms of the Agreement to revise the Agreement End Date, all upon and subject to the terms and conditions of this Amendment.

NOW, THEREFORE, for and in consideration of the mutual promises and covenants contained herein, and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Parties, intending to be legally bound hereby, agree as follows:

1.Capitalized Terms. All initially capitalized, undefined terms herein will have the meaning given such terms in the Agreement.

2.Amendment. The Agreement shall be amended as follows:

(a)The date set forth in the first sentence of Section 10.