Company: GIGGU
Filing Date: 2025-09-29
Form Type: 425
Source: 0001193125-25-221783
Chunk: 180

Company: GigCapital7 Corp.
Filing Date: 2025-09-29
Form: 425
Chunk 180
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IVES TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW ANY
RIGHT HE, SHE OR IT MAY HAVE TO A TRIAL BY JURY WITH RESPECT TO ANY LITIGATION DIRECTLY OR INDIRECTLY ARISING OUT OF, UNDER OR IN CONNECTION WITH THIS AGREEMENT. EACH OF THE PARTIES HERETO (I) CERTIFIES THAT NO REPRESENTATIVE, AGENT OR ATTORNEY
OF ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THAT FOREGOING WAIVER AND (II) ACKNOWLEDGES THAT HE, SHE OR IT AND THE OTHER PARTIES HERETO HAVE BEEN
INDUCED TO ENTER INTO THIS AGREEMENT AND THE TRANSACTIONS CONTEMPLATED HEREBY, AS APPLICABLE, BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS .

[Signature Pages Follow]

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

| GIGCAPITAL7 CORP |     |                         |
| By:              |     |                         |
| Name:            |     | Dr. Avi S. Katz         |
| Title:           |     | Chief Executive Officer |

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

| By:                            |
| Name: Samuel Gibson            |
| Title: Chief Executive Officer |
| Address:                       |
| Email: ***                     |

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

| By:                            |
| Name: Mark Kress               |
| Title: Chief Financial Officer |
| Address:                       |
| Email: mkress@hadronenergy.com |

EXHIBIT A Stockholders of Record – Number of Shares

| Stockholder of Record |     | Number of Shares |         |
| Samuel Gibson         |     |                  | 900,000 |
| Mark Kress            |     |                  | 100,000 |

EXHIBIT B

Business Combination Agreement

See Attached

EXHIBIT C

JOINDER TO TRANSACTION SUPPORT AGREEMENT

This JOINDER TO TRANSACTION SUPPORT AGREEMENT (this “”) is made and entered into as of [•], by and among each
of the stockholders of Hadron Energy, Inc., a Delaware corporation (the “”), whose names appear on the signature pages of this