Company: GIGGU
Filing Date: 2025-11-12
Form Type: S-4
Source: 0001193125-25-277896
Chunk: 859

Company: GigCapital7 Corp.
Filing Date: 2025-11-12
Form: S-4
Chunk 859
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 Title:              |     | Chief Executive Officer |

Signature Page to Lock-Up Agreement A-143

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed as of the date first written above.

| LOCK-UP PARTY:      |     |       |
| By:                 |     |       |
|                     |     | Name: |
| Address for Notice: |     |       |
| Email:              |     |       |

Shares of Common Stock beneficially owned on the date hereof: Signature Page to Lock-Up Agreement A-144

EXHIBIT E FIRPTA CERTIFICATE [_], 2026 Internal Revenue Service Center P.O. Box 409101 Ogden, UT 84409 NOTICE TO THE INTERNAL REVENUE SERVICE OF HADRON ENERGY, INC., A DELAWARE CORPORATION (“ TARGET”), REGARDING UNITED STATES REAL PROPERTY HOLDING CORPORATION STATUS UNDER TREASURY REGULATIONS SECTION 1.897-2(h)(2) To whom it may concern: 1. This Notice is being filed by Target pursuant to Section 1.897-2(h)(2)of the Treasury Regulations promulgated under the Internal Revenue Code of 1986, as amended (the “ Code”). 2. The undersigned, on behalf of Target, hereby declares that stock of Target is not a United States real property interest within the meaning of Section 897 of the Code because Target is not and has not been a United States real property holding corporation, as that term is defined in Section 897(c)(2) of the Code, during the applicable period specified in Section 897(c)(1)(A)(ii) of the Code. 3. Target’s U.S. employer identification number is: [_]. 4. Target’s address is: [_]. 5. In connection with the acquisition of Target by GigCapital7 Corp., a Delaware corporation (“ Acquiror”), the undersigned provided the attached statement to Acquiror declaring that stock in Target is not a United States real property interest. The statement was voluntarily provided in response to a request from the transferee, Acquiror, under Treasury Regulations Section 1.1445-2(c)(3)(i). 6. Acquiror’s U.S. employer identification number is: [ ]. 7. Acquiror’s address is: [ ]. 8. Under penalties of perjury, the undersigned declares that he has examined this certification and the attachment hereto and, to the