Company: GIGGU
Filing Date: 2025-09-29
Form Type: 425
Source: 0001193125-25-221783
Chunk: 208

Company: GigCapital7 Corp.
Filing Date: 2025-09-29
Form: 425
Chunk 208
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 this Agreement by, among other things, the mutual waivers and certifications in this
.

Section6.9 Specific Performance. Each party acknowledges and
agrees that the other parties hereto would be irreparably harmed and would not have any adequate remedy at law in the event that any of the provisions of this Agreement were not performed by such first party in accordance with their specific terms
or were otherwise breached by such first party. Accordingly, each party agrees that the other parties hereto shall be entitled to an injunction or injunctions to prevent breaches of this Agreement and to enforce specifically the terms and provisions
of this Agreement, this being in addition to any other remedy to which such parties are entitled at law or in equity.

[Signature Page
Follows.]

18

IN WITNESS WHEREOF, each of the parties has executed this Agreement as of the date first written above.

| COMPANY:                        |
| GIGCAPITAL7 CORP.               |
| By:                             |
| Name: Dr. Avi S. Katz           |
| Title: Chief Executive Officer  |
| Address for Notice:             |
| 1731 Embarcadero Rd., Suite 200 |
| Palo Alto, CA                   |

[Signature Page to Registration Rights Agreement]

IN WITNESS WHEREOF, each of the undersigned has executed this Agreement as of the date first written above.

| HOLDER:             |
| By:                 |
| Name:               |
| Title:              |
| Address for Notice: |
| Telephone No.:      |
| Email Address:      |

[Signature Page to Registration Rights Agreement]

SCHEDULE A Holders Receiving Shares Pursuant to the Business Combination

| 1. | Samuel Gibson |

| 2. | Mark Kress |

| 3. | Steven Birdsall |

| 4. | Shawn DeAngelo |

SCHEDULE B Other Holders Party to the Original RRA

| 1. | *** |

EXHIBIT D

FORM OF LOCK-UP AGREEMENT

This Lock-Up Agreement (this “”) is made and entered into as of
, 202[], by and among GigCapital7 Corp., a Cayman Islands exempted company (which shall transfer by way of continuation and domesticate as a Delaware corporation prior to Closing)
(“”), Hadron Energy, Inc., a Delaware corporation (the “”), and those equityholders of the Company listed on the signature pages hereto (each, a
“” and, collectively, the “”). Capitalized terms used but