Company: GIGGU
Filing Date: 2025-11-12
Form Type: S-4
Source: 0001193125-25-277896
Chunk: 804

Company: GigCapital7 Corp.
Filing Date: 2025-11-12
Form: S-4
Chunk 804
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                 |     | /s/ Samuel Gibson |
| Name:               |     | Samuel Gibson     |
| Title:              |     | Founder & CEO     |

{Signature Page to Business Combination Agreement} A-93

EXHIBIT A 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, executed, and acknowledged by each of the Constituent Corporations in accordance with the requirements of Section 251(c) of the DGCL. THIRD:The Company shall be the surviving corporation after the Merger (the “ Surviving Corporation”)and the name of the Surviving Corporation shall be Hadron Energy Operating Company Inc., a Delaware corporation. FOURTH:TheCertificate of Incorporation of the Company as in effect immediately prior to the Merger shall be amended and restated in its entirety to read as set forth in Exhibit Ahereto, and, as so amended and restated, shall be the Certificate of Incorporation of the Surviving Corporation until thereafter amended as provided therein or by applicable law. FIFTH:An executed copy of the Merger Agreement is on file at the principal place of business of the Surviving Corporation at the following address: 3 Twin Dolphin Drive, Ste 260 Redwood City, CA 94065 SIXTH:A copy of the Merger Agreement will be furnished by the Surviving Corporation, on