Company: GIGGU
Filing Date: 2025-11-12
Form Type: S-4
Source: 0001193125-25-277896
Chunk: 1069

Company: GigCapital7 Corp.
Filing Date: 2025-11-12
Form: S-4
Chunk 1069
---
, the Co-Registranthas duly caused this Registration Statement on Form S-4to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Redwood City, State of California, on the 12th day of November, 2025.

| Hadron Energy, Inc. |     |                                     |
| By:                 |     | /s/ Samuel Gibson                   |
| Name:               |     | Samuel Gibson                       |
| Title:              |     | Founder and Chief Executive Officer |

POWER OF ATTORNEY KNOW ALL PERSONS BY THESE PRESENTS, that each of the undersigned constitutes and appoints Samuel Gibson, acting alone, his or her true and lawful attorney-in-factand agents, with full power of substitution and resubstitution, for such person and in his or her name, place and stead, in any and all capacities, to sign this Registration Statement on Form S-4(including all pre-effectiveand post-effective amendments and registration statements filed under the Securities Act of 1933), and to file the same, with all exhibits thereto, and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorney-in-factand agent, full power and authority to do and perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming that such attorney-in-factand agent, or his or her substitute or substitutes, may lawfully do or cause to be done by virtue hereof. Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated.