Company: GIGGU
Filing Date: 2025-11-12
Form Type: S-4
Source: 0001193125-25-277896
Chunk: 844

Company: GigCapital7 Corp.
Filing Date: 2025-11-12
Form: S-4
Chunk 844
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 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] A-129

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] A-130

SCHEDULE A Holders Receiving Shares Pursuant to the Business Combination

| 1. | Samuel Gibson |

| 2. | Mark Kress |

| 3. | Steven Birdsall |

| 4. | Shawn DeAngelo |

A-131

SCHEDULE B Other Holders Party to the Original RRA

| 1. | *** |

A-132

<div align='center'>**EXHIBIT D

FORM OF LOCK-UP AGREEMENT**</div>

This Lock-Up Agreement (this “Agreement”) 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) (“GigCapital7”), Hadron Energy, Inc., a Delaware corporation (the “Company”), and those equityholders of the Company listed on the signature pages hereto (each, a “Lock-UpParty” and, collectively, the “Lock-UpParties”). Capitalized terms used but not otherwise defined herein shall have the respective meanings ascribed to such terms in the Business Combination Agreement (as defined below).

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

WHEREAS, on September 27, 2025, GigCapital7, MMR Merger Sub, Inc., a Delaware corporation and a wholly-owned direct subsidiary of GigCapital7 (“Merger Sub”), and the Company, entered into a Business Combination Agreement (the “Business Combination Agreement”), pursuant to which, among other things, Merger Sub will merge with and into the Company (the “Merger”), with the Company surviving the