Company: GIGGU
Filing Date: 2025-11-12
Form Type: S-4
Source: 0001193125-25-277896
Chunk: 861

Company: GigCapital7 Corp.
Filing Date: 2025-11-12
Form: S-4
Chunk 861
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 the date hereof, as indicated below; 3. Target’s U.S. employer identification number is [_]; and 4. Target’s office address is [_]. This certificate is made in accordance with the requirements of Treasury Regulations Sections 1.897-2(h)and 1.1445-2(c)(3).Target understands that this certificate may be disclosed to the Internal Revenue Service by Acquiror and that any false statement contained herein could be punished by fine, imprisonment, or both. This certificate constitutes authorization for Acquiror, as agent for Target, to deliver this certificate, along with the appropriate notification, to the Internal Revenue Service on behalf of Target. Under penalties of perjury, I declare that I have examined this certificate and, to the best of my knowledge and belief, it is true, correct and complete, and I further declare that I have authority to sign this document on behalf of Target.

|                  |     | HADRON ENERGY, INC. |     |        |
| Dated: [_], 2026 |     | By:                 |     |        |
|                  |     |                     |     | Name:  |
|                  |     |                     |     | Title: |

A-146

ANNEX B CERTIFICATE OF MERGER of MMR MERGER SUB, INC. a Delaware corporation with and into HADRON ENERGY, INC. a Delaware corporation Pursuant to Section 251 of the General Corporation Law of the State of Delaware, as amended (the “ DGCL”) and in lieu of filing the agreement of merger, Hadron Energy, Inc., a Delaware corporation (the “ Company”), in connection with the merger of MMR Merger Sub, Inc., a Delaware corporation (“ Merger Sub”), with and into the Company (the “ Merger”), hereby certifies as follows: FIRST: The names and states of incorporation of each of the constituent corporations to the Merger (the “ Constituent Corporations”) are:

| Name                 |     | State of Incorporation |
| Hadron Energy, Inc.  |     | Delaware               |
| MMR Merger Sub, Inc. |     | Delaware               |

SECOND:A Business Combination Agreement (the “ Merger Agreement”),made and entered into as of September 27, 2025, by and among Merger Sub, the Company, and the other parties thereto, setting forth the terms and conditions of the merger of the Company with and into Merger Sub,has been approved, adopted, certified,