Company: GIGGU
Filing Date: 2025-09-29
Form Type: 425
Source: 0001193125-25-221783
Chunk: 1

Company: GigCapital7 Corp.
Filing Date: 2025-09-29
Form: 425
Chunk 1
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 is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2of the Securities Exchange Act of 1934 (§240.12b-2of this chapter). Emerging growth company ☒ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

| Item 1.01 | Entry into a Material Definitive Agreement. |

On September 27, 2025, GigCapital7 Corp., a Cayman Islands exempted company (which will transfer by way of continuation and domesticate as a Delaware corporation prior to the Closing (as defined below)) (“ GigCapital7”), entered into a Business Combination Agreement (the “ Business Combination Agreement”), dated as of September 27, 2025, by and among GigCapital7, MMR Merger Sub, Inc., a Delaware corporation and a direct wholly owned subsidiary of GigCapital7 (“ Merger Sub”), and Hadron Energy, Inc., a Delaware corporation (the “ Company”), pursuant to which, among other things and subject to the terms and conditions contained therein, Merger Sub will merge with and into the Company (the “ Merger”), with the Company continuing as the surviving company (the Company, in its capacity as the surviving corporation of the Merger, is sometimes referred to as the “ Surviving Company”). The transactions contemplated by the Business Combination Agreement are referred to herein as the “ Transactions.” The Company, Merger Sub, and GigCapital7 are referred to herein individually as a “ Party” and, collectively, as the “ Parties.” The combined company’s business will continue to operate through the Company. This Current Report on Form 8-K(this “ Current Report”) provides a summary of the Business Combination Agreement and the other agreements entered into (and certain agreements to be entered into) in connection with the Transactions. The descriptions of these agreements do not purport to be complete and are qualified in their entirety by the terms and conditions of such agreements or the forms of these agreements, as applicable, copies of which are filed as Exhibits 2.1, 10.1and 10.2to this Current Report and are incorporated by reference into this Current Report. The Business Combination Agreement and the Transactions were approved by the board of directors of GigCapital7 and the