Company: GIGGU
Filing Date: 2025-11-26
Form Type: 425
Source: 0001193125-25-298527
Chunk: 1

Company: GigCapital7 Corp.
Filing Date: 2025-11-26
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 8.01 | Other Events. |

As GigCapital7 Corp., a Cayman Islands exempted company (“ GigCapital7”), stated in its Current Report on Form 8-Kthat it filed with the U.S. Securities and Exchange Commission on October 15, 2025, GigCapital7 and Hadron Energy, Inc., a Delaware corporation (the “ Company”) will conduct meetings with members of the investment community in connection with certain financing activities in furtherance of their previously announced business combination. The Company is contemplating a private capital raise through the issuance of simple agreements for future equity (“ SAFEs”) in one or more private placements exempt from registration under the Securities Act of 1933, as amended (the “ Securities Act”). An updated copy of an investor presentation intended to be used in such meetings is furnished as Exhibit 99.1 to this Current Report on Form 8 K and incorporated herein by reference. In addition, from time to time, GigCapital7 and the Company may use the investor presentation in non-dealroadshow meetings and in connection with discussions regarding a potential private investment in public equity (“ PIPE”) financing for the post-closingcompany, subject to market conditions and other factors. The information in this Item 8.01 (including Exhibit 99.1) is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “ Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing. Additional Information and Where to Find It In connection with the proposed business combination between GigCapital7 and the Company (the “ Business Combination”), GigCapital7 and the Company has filed a registration statement on Form S-4,and intends to file amended registration statements on Form S-4/A(the initial