Company: GIGGU
Filing Date: 2025-09-29
Form Type: 425
Source: 0001193125-25-221783
Chunk: 168

Company: GigCapital7 Corp.
Filing Date: 2025-09-29
Form: 425
Chunk 168
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 in .

“” means that certain Warrant Agreement, dated as of August 28, 2024, by and between the Purchaser
and Continental, as warrant agent.

[REMAINDER OF PAGE INTENTIONALLY LEFT BLANK; SIGNATURE PAGE FOLLOWS]

80

IN WITNESS WHEREOF, each Party hereto has caused this Business Combination Agreement to be signed and delivered as of the date first written above.

| THE PURCHASER:       |     |                         |
| GIGCAPITAL7 CORP.    |     |                         |
| By:                  |     | /s/ Dr. Avi Katz        |
| Name:                |     | Dr. Avi Katz            |
| Title:               |     | Chief Executive Officer |
| MERGER SUB:          |     |                         |
| MMR MERGER SUB, INC. |     |                         |
| By:                  |     | /s/ Dr. Raluca Dinu     |
| Name:                |     | Dr. Raluca Dinu         |
| Title:               |     | Chief Executive Officer |

{Signature Page to Business Combination Agreement}

IN WITNESS WHEREOF, each Party hereto has caused this Business Combination Agreement to be signed and delivered as of the date first written above.

| THE COMPANY:        |     |                   |
| HADRON ENERGY, INC. |     |                   |
| By:                 |     | /s/ Samuel Gibson |
| Name:               |     | Samuel Gibson     |
| Title:              |     | Founder & CEO     |

{Signature Page to Business Combination Agreement}

EXHIBIT A CERTIFICATE OF MERGER of MMR MERGER SUB, INC. a Delaware corporation with and into HADRON ENERGY, INC. a Delaware corporation Pursuant to Section 251 of the General Corporation Law of the State of Delaware, as amended (the “ DGCL”) and in lieu of filing the agreement of merger, Hadron Energy, Inc., a Delaware corporation (the “ Company”), in connection with the merger of MMR Merger Sub, Inc., a Delaware corporation (“ Merger Sub”), with and into the Company (the “ Merger”), hereby certifies as follows: FIRST: The names and states of incorporation of each of the constituent corporations to the Merger (the “ Constituent Corporations”) are:

| Name                 |     | State of Incorporation |
| Hadron Energy, Inc.  |     | Delaware               |
|