Company: GIGGU
Filing Date: 2025-09-29
Form Type: 425
Source: 0001193125-25-221783
Chunk: 256

Company: GigCapital7 Corp.
Filing Date: 2025-09-29
Form: 425
Chunk 256
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shareholders of GIG and Hadron have committed to customary lock-ups.

The boards of directors of both Hadron and
GIG have unanimously approved the Business Combination. The Business Combination is expected to be completed in early 2026, subject to customary closing conditions, including regulatory and stockholder approvals.

Additional information about the proposed Business Combination, including a copy of the business combination agreement (the “Business Combination Agreement”), will be provided in a Current Report on Form 8-K to be filed by GIG with the U.S. Securities and Exchange Commission (“SEC”) and will be available at www.sec.gov. In
addition, Hadron and GIG intend to file relevant materials with the SEC, including a registration statement on Form S-4 (the “Registration Statement”), which will include a proxy
statement/prospectus of GIG, and will file other documents regarding the Business Combination with the SEC. This communication is not intended to be, and is not, a substitute for the proxy statement/prospectus or any other document that GIG has
filed or that GIG or Hadron may file with the SEC in connection with the Business Combination.

Advisors

Cohen & Company Capital Markets, a division of Cohen & Company Securities, Inc., is serving as the exclusive financial advisor and lead
capital markets advisor to Hadron.

Duane Morris LLP is serving as legal counsel for Hadron. DLA Piper LLP (US) is serving as legal counsel for
GIG.

The Blueshirt Group is serving as investor relations advisor for Hadron.

Aspectus Group is serving as strategic communications advisors for Hadron.

About Hadron Energy, Inc.

Hadron is a pioneer in
MMR technology. Designed to deliver 10 MW of power, Hadron’s MMR will be smaller, more cost-effective, and faster to deploy than other proposed MMR power solutions. The revolutionary design of Hadron’s MMR allows its reactor core and
containment shell to be transportable in a shipping container, providing a versatile deployment model for end users. Whether powering an artificial intelligence data center, remote community, or an industrial hub, Hadron’s MMR is expected to
provide a reliable, safe and scalable nuclear energy solution. For more information, please visit https://www.hadronenergy.com/.

About GigCapital7 Corp.

GIG is a special purpose acquisition company with a Mentor-Investor methodology
and a mission to partner with a high technology differentiating company to forge a successful path to the