Company: GIGGU
Filing Date: 2025-11-13
Form Type: 425
Source: 0001193125-25-279073
Chunk: 0

Company: GigCapital7 Corp.
Filing Date: 2025-11-13
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
and GigCapital7 Announce Filing of Registration Statement on Form S-4 in Connection with Proposed Business Combination

New York, NY– November13, 2025 — Hadron Energy, Inc.
(“Hadron”), an innovative developer of factory-fabricated, light-water micro-modular reactors (“MMRs”), and GigCapital7 Corp. (Nasdaq: GIG), today announced the filing of their joint registration statement on Form S-4 with the U.S. Securities and Exchange Commission (SEC) in connection with their previously announced $1.2 billion business combination agreement on September 29, 2025, targeting to close the merger
during the first half of Q1 2026.

The filing of the Form S-4 marks a major milestone in Hadron’s path
toward becoming the world’s first publicly traded light-water MMR company. The submission includes comprehensive information about the proposed transaction, corporate governance, financial statements, and details of Hadron’s Halo MMR, a 10 MWe light-water reactor designed for transportability, manufacturability, and long-duration operation.

“Filing the Form S-4 represents a significant step forward in our journey to bring the Halo microreactor to
market and to the public markets,” said Samuel Gibson, Founder and Chief Executive Officer of Hadron Energy. “This milestone reflects the tireless work of our team and partners as we move closer to commercial deployment and to building a
company that can deliver secure, zero-carbon power where it is needed most.”

Dr. Avi Katz, Founder and Chairman of GigCapital is thrilled to reach this critical milestone.
“The GigCapital Global franchise is humbled by the opportunity to partner with Hadron in taking the company public by combination with our seventh
Private-to-Public Equity (PPE) entity, GigCapital7 Corp. (Nasdaq: GIG). It’s a unique privilege to work with Mr. Gibson, an industrial visionary and an
upcoming recognized leader who assembled a world-class team to drive the first light-water MMR company to the public world in support of the U.S. administration’s national agenda. This is the foremost opportunity to bring value to Hadron as we
deploy our Mentor Investor methodology to bolster the successful future and be part of Hadron