Company: GIGGU
Filing Date: 2025-12-03
Form Type: 425
Source: 0001193125-25-305993
Chunk: 0

Company: GigCapital7 Corp.
Filing Date: 2025-12-03
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
Receives Nuclear Regulatory Commission Acceptance of Its Quality Assurance Program Description Topical Report

New York, NY – Hadron Energy, Inc. (“Hadron”) today announced that the U.S. Nuclear Regulatory Commission
(the “NRC”) has formally accepted for review the company’s Quality Assurance Program Description (“QAPD”) Topical Report, marking a critical regulatory milestone in Hadron’s licensing pathway for the Halo
Micro-Modular Reactor (“MMR”). The NRC’s acceptance for review follows its completeness determination of the submitted QAPD Topical Report and establishes the agency’s initial review schedule, key regulatory milestones, and
estimated staff-hour commitments.

The NRC’s completeness determination confirms that Hadron’s QAPD Topical Report, which contains information
covering the design, engineering, procurement, fabrication, construction, testing, and operations quality activities of the Halo MMR, contains the information required for formal docketing and detailed technical review. This milestone represents the
company’s first major licensing submission under its Quality Assurance framework and reinforces Hadron’s commitment to meeting the highest standards of nuclear safety, regulatory compliance, and operational excellence.

In its notification to Hadron, the NRC provided the expected schedule for Requests for Additional
Information (RAIs) and Regulatory Confirmatory Items (RCIs), based on an assumed 30-day response window. The agency also outlined anticipated review-hour allocations and noted that the schedule may adjust
based on the complexity of technical issues or other unanticipated factors during the review process.

“This acceptance for review by the NRC is a
critical step in our regulatory engagement strategy and highlights the quality and completeness of Hadron’s early licensing work,” said Samuel Gibson, Founder and Chief Executive Officer of Hadron Energy. “The QAPD is foundational
to any nuclear program. We appreciate the NRC staff’s professionalism and look forward to continuing constructive, timely engagement as we advance the Halo MMR toward licensing and deployment.”

Acceptance for review of the QAPD Topical Report follows a series of recent milestones for Hadron, including the company’s $1.2 billion definitive
business combination agreement with GigCapital7 Corp. (Nasdaq: GIG) and the designation of its public-company Board of Directors. As Hadron moves through the NRC review