Company: GIGGU
Filing Date: 2025-11-12
Form Type: S-4
Source: 0001193125-25-277896
Chunk: 954

Company: GigCapital7 Corp.
Filing Date: 2025-11-12
Form: S-4
Chunk 954
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 electronically or by facsimile shall be deemed to be original signatures.

20. Termination. This Agreement shall terminate upon the earliest of (a) the Closing of the Merger (provided, however, that upon such termination, Section7 shall survive in accordance with its terms), (b) the termination of the BCA in accordance with its terms, and (c) the time this Agreement is terminated upon the mutual written agreement of GigCapital7, the Company and the Sponsor.

<div align='center'>F-9</div>

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed (where applicable, by their respective officers or other authorized Persons thereunto duly authorized) as of the date first written above.

| GIGCAPITAL7:                   |     |                     |
| GIGCAPITAL7 CORP.              |     |                     |
| By:                            |     | /s/ Dr. Avi S. Katz |
| Name: Dr. Avi S. Katz          |     |                     |
| Title: Chief Executive Officer |     |                     |
| SPONSOR:                       |     |                     |
| GIGACQUISITIONS7 CORP.         |     |                     |
| By:                            |     | /s/ Dr. Avi S. Katz |
| Name: Dr. Avi S. Katz          |     |                     |
| Title: Chief Executive Officer |     |                     |

[Signature Page to Sponsor Support Agreement] F-10

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed (where applicable, by their respective officers or other authorized Persons thereunto duly authorized) as of the date first written above.

| THE COMPANY:                   |     |                   |
| HADRON ENERGY, INC.            |     |                   |
| By:                            |     | /s/ Samuel Gibson |
| Name: Samuel Gibson            |     |                   |
| Title: Chief Executive Officer |     |                   |

[Signature Page to Sponsor Support Agreement] F-11

**ANNEX G

Execution Version**

<div align='center'>**Transaction Support Agreement**</div>

TRANSACTION SUPPORT AGREEMENT, dated as of September 27, 2025 (this “Agreement”), 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”), and certain of the stockholders