Company: GIGGU
Filing Date: 2025-09-29
Form Type: 425
Source: 0001193125-25-221783
Chunk: 24

Company: GigCapital7 Corp.
Filing Date: 2025-09-29
Form: 425
Chunk 24
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parts                   |     | 62 |
| Section 9.14          |     | Legal Representation           |     | 63 |
| Section 9.15          |     | Waiver of Claims Against Trust |     | 63 |
| Section 9.16          |     | Company Disclosure Letter      |     | 64 |
| Section 9.17          |     | Transferred Information        |     | 64 |
| Article X DEFINITIONS |     |                                |     | 65 |
| Section 10.01         |     | Certain Definitions            |     | 65 |

| Exhibits  |     |                                       |
| Exhibit A |     | Form of Certificate of Merger         |
| Exhibit B |     | Form of Transaction Support Agreement |
| Exhibit C |     | Form of Registration Rights Agreement |
| Exhibit D |     | Form of Lock-Up Agreement             |
| Exhibit E |     | Form of FIRPTA Certificate            |

(iv)

BUSINESS COMBINATION AGREEMENT

This Business Combination Agreement (this “”) is made and entered into as of September 27, 2025, by and among
(i) GigCapital7 Corp., a Cayman Islands exempted company (which shall transfer by way of continuation and domesticate as a Delaware corporation prior to Closing) (the “”), (ii) MMR Merger Sub, Inc., a Delaware
corporation and a direct wholly owned subsidiary of the Purchaser (“”), and (iii) Hadron Energy, Inc., a Delaware corporation (the “”). The Purchaser, Merger Sub and the Company are
sometimes referred to herein individually as a “” and, collectively, as the “.” Certain capitalized terms used in this Agreement have the meanings given to them in of this Agreement.

RECITALS:

WHEREAS, the Purchaser is a special purpose acquisition company incorporated as a Cayman Islands exempted company for the purpose of
effecting a merger, share exchange, asset acquisition, share purchase, reorganization or similar business combination with one or more businesses;

WHEREAS, Merger Sub is a newly incorporated Delaware corporation, wholly owned by the Purchaser, and was formed for the purpose of
effectuating the Merger (as defined below);

WHEREAS, at least two (2) Business Days prior to the Closing Date (as defined
below) and subject to the satisfaction or waiver of the conditions of this Agreement (other than those conditions that by their nature are to be satisfied at the Closing), the Purch