Company: GIGGU
Filing Date: 2025-09-29
Form Type: 425
Source: 0001193125-25-221783
Chunk: 169

Company: GigCapital7 Corp.
Filing Date: 2025-09-29
Form: 425
Chunk 169
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 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 request and without cost, to any stockholder of either of the Constituent Corporations.

SEVENTH: That this Certificate of Merger and the Merger shall become effective
immediately upon the filing of this Certificate of Merger with the Secretary of State of the State of Delaware.

IN WITNESS WHEREOF, the Company has caused this Certificate of Merger to be duly executed by an authorized officer on [●], 2026.

| HADRON ENERGY, INC. |
| By:                 |
| Name:               |
| Title:              |

[ Signature Page to Certificate of Merger]

EXHIBIT A

AMENDED AND RESTATED

CERTIFICATE OF INCORPORATION

OF HADRON ENERGY OPERATING COMPANY INC.

ARTICLE I

The name of
the corporation is “Hadron Energy Operating Company Inc.” (the “Corporation”).

ARTICLE II

The address of the registered office of the corporation in the State of Delaware is 251 Little Falls Drive, City of Wilmington,
County of New Castle, Delaware 19808. The name of