Company: GIGGU
Filing Date: 2025-10-30
Form Type: 425
Source: 0001193125-25-257513
Chunk: 1

Company: GigCapital7 Corp.
Filing Date: 2025-10-30
Form: 425
Chunk 1
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 qualified and supported by a robust domestic supply chain.
Using LEU+ allows Hadron to achieve a 10-year fuel cycle while relying on a well-established, regulated fuel infrastructure rather than experimental materials or processes.

While some developers are pursuing sodium, gas, or molten-salt-cooled reactors, these approaches introduce significant new engineering and regulatory
challenges (3). Liquid sodium reacts violently with air and water, requiring complex containment systems and specialized facilities (3). Gas-cooled and molten-salt designs operate at extremely high
temperatures that

demand exotic materials and lengthy qualification testing (3). In contrast, light-water reactors like the Hadron Halo use ordinary water as both coolant and moderator, a technology the nuclear industry already understands deeply. This choice translates to proven operational safety, a well-established licensing framework, and compatibility with existing manufacturing and fuel supply infrastructure. Factory production further distinguishes the Hadron Halo from conventional gigawatt-scale reactors that can take a decade to construct (4). Each unit will be assembled and tested in under a year, shipped by truck or rail, and installed with minimal on-sitework. This approach allows communities, industrial sites, and data-center campuses to bring nuclear power online in months instead of years. By combining proven PWR safety with modern modular design, Hadron Energy hopes to redefine how nuclear power can be delivered: scalable, transportable, and ready to meet the growing demand for reliable, zero-carbonelectricity in the age of artificial intelligence and industrial electrification. Hadron’s technology development follows the recently announced $1.2Bn definitive business combination agreement with GigCapital7 Corp. (Nasdaq: GIG), which will make Hadron the first publicly traded light-water microreactor company in the world. This communication strengthens Hadron’s position as a leader in the emerging U.S. nuclear renaissance, helping deliver secure, zero-carbonenergy where it is needed most. Sources

| (1) | https://www.iaea.org/topics/water-cooled-reactors |

| (2) | https://www.cato.org/regulation/fall-2025/next-nuclear-renaissance#large-reactors |

| (3) | https://www.congress.gov/crs-product/R45706 |

| (4) | https://www.gao.gov/assets/gao-15-652.pdf?utm_source=chatgpt.com |

About Hadron Energy, Inc.

Hadron is a pioneer in MMR technology. Designed to deliver 10