Company: GIGGU
Filing Date: 2025-11-04
Form Type: 425
Source: 0001193125-25-263626
Chunk: 0

Company: GigCapital7 Corp.
Filing Date: 2025-11-04
Form: 425
Chunk 0
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Filed by GigCapital7 Corp.

Pursuant to Rule 425 under the Securities Act of 1933

Commission File No.: 001-42262

Subject Company: GigCapital7 Corp.

Hadron Energy Advances its Regulatory Readiness Ahead of $1.2Bn Merger

New York, NY – November 4, 2025 – As Hadron Energy, Inc. (“Hadron”) approaches its $1.2Bn SPAC
merger with GigCapital7 Corp. (Nasdaq: GIG), the company showcases its proactive and foundational licensing approach with the U.S. Nuclear Regulatory Commission (NRC).

Hadron’s light-water design offers a clear advantage with the U.S. Nuclear Regulatory Commission (NRC), the nation’s regulator for civilian
nuclear power, which has decades of experience licensing this technology and currently oversees 94 operating light-water reactors in the United States. Building on that foundation, Hadron has executed a uniquely proactive approach to regulatory
readiness since its founding.

The company has sought engagement with the NRC as the commission forms policies with respect to the breakthrough advanced
nuclear reactor industry. In December 2024, Hadron attended its first Advanced Reactor Stakeholder Meeting, where it became an active contributor to policy development in the MMR space, and continued to attend NRC public meetings regularly as it
began to prepare its own regulatory strategy for the Hadron MMR. One critical meeting occurred on July 17-18, 2025, where Hadron Energy stood as the only company to publicly support a more restrictive safety
framework for microreactors and other low consequence reactors; it is a framework that Hadron has full confidence its Halo MMR will meet.

In April 2025, the company submitted a Letter of Intent and initial Regulatory Engagement Plan (REP), which
began the process of formal pre-application engagement with the NRC. Following its initial public meeting, Hadron also filed an updated REP aligned with the NRC’s latest guidance to streamline the
commercialization of its microreactor, and since that time, has continued to follow its REP, making quality submissions on time and informed by NRC feedback. Hadron has filed its Quality Assurance Program Description (QAPD) and will soon file its
Topical Report on Principal Design Criteria (PDC).

Hadron continues to pursue its regulatory goals despite the government shut-down, developing
comprehensive topical reports and hiring essential talent that will be foundational to the Halo M