Company: GIGGU
Filing Date: 2025-09-29
Form Type: 425
Source: 0001193125-25-221783
Chunk: 253

Company: GigCapital7 Corp.
Filing Date: 2025-09-29
Form: 425
Chunk 253
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 at approximately $1.2 billion prior to raising any public capital and excluding any non-redeemed cash from the GIG trust 
 account, providing an attractive entry point for GIG shareholders as Hadron scales rapidly to meet surging global energy demand.                                           |

| • |     | The business combination will provide approximately $200 million in net proceeds after                                                                         
 transaction expenses from the cash currently held in GIG’s trust account, assuming no redemptions. Proceeds will be used to accelerate product development and 
 commercial deployment of Hadron’s technology, as well as to pay transaction expenses.                                                                          |

| • |     | The business combination is expected to be completed during the first half of Q1 2026, subject                                                         
 to customary closing conditions and regulatory approvals, and the combined company is expected to be listed on a US national exchange under the symbol 
 “HDRN.” Upon closing of the transaction, Hadron would become the first publicly listed, light water micro modular reactor company.                     |

New York, NY– September 29, 2025– Hadron Energy, Inc. (“ Hadron”), a cutting-edge innovator in micro modular reactor (“ MMR”) technology, and GigCapital7 Corp. (“ GIG”), a Private-to-PublicEquity (PPE) ™company also known as special purpose acquisition company (SPAC) (NASDAQ: GIG), today announced that they have entered into a definitive business combination agreement. The proposed business combination (the “ Business Combination” or the “transaction”) would create a publicly traded light water MMR company. Upon closing of the transaction, the combined company is expected to be listed on a US national exchange under the symbol “HDRN.”

“With power demand continuing to increase rapidly, nuclear energy is
re-emerging as a compelling solution to today’s most pressing energy needs, with MMRs being central to this revolution,” said Samuel Gibson, founder and CEO at Hadron. “To tackle effectively
the growing energy demand, we need to move beyond legacy nuclear technology. A recent report from the International Energy Agency projects that electricity demand from artificial intelligence data centers alone will more than quadruple by 2030. With
Hadron’s MMR technology, we are unlocking a new era of clean nuclear energy in a safe, scalable, and versatile way. I am incredibly proud to announce our partnership with GigCapital7 and the start of our journey to the public markets.”

Hadron Background

Hadron is a leading innovator in
MMR technology.