Company: GIGGU
Filing Date: 2025-09-29
Form Type: 425
Source: 0001193125-25-221783
Chunk: 172

Company: GigCapital7 Corp.
Filing Date: 2025-09-29
Form: 425
Chunk 172
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EXHIBIT B

Transaction Support Agreement

TRANSACTION SUPPORT AGREEMENT, dated as of September 27, 2025 (this “”), by and among GigCapital7 Corp., a
Cayman Islands exempted company (which shall transfer by way of continuation and domesticate as a Delaware corporation prior to Closing) (“”), and certain of the stockholders of Hadron Energy, Inc., a Delaware
corporation (the “”), whose names appear on the signature pages of this Agreement (each, a “” and, collectively, the “”).

RECITALS

WHEREAS,
GigCapital7, MMR Merger Sub, Inc., a Delaware corporation and wholly owned subsidiary of GigCapital7 (“”), and the Company have negotiated a Business Combination Agreement in the form attached hereto as
(the “”; terms used but not defined in this Agreement shall have the meanings ascribed to them in the BCA), which provides, among other things, that, upon the terms and subject to the conditions thereof, Merger Sub will merge
with and into the Company (the “”), with the Company surviving the Merger as a wholly owned subsidiary of GigCapital7;

WHEREAS, as of the date hereof, each Stockholder owns of record the number of shares of Company Common Stock as set forth opposite such
Stockholder’s name on hereto (all such shares of Company Common Stock and any shares of Company Common Stock of which ownership of record or the power to vote is hereafter acquired by the Stockholders prior to the termination
of this Agreement being referred to herein as the “”); and

WHEREAS, as a condition and inducement to the
Company’s and GigCapital7’s willingness to enter into the BCA and to consummate the transactions contemplated therein, the parties hereto desire to agree to certain matters set forth herein.

AGREEMENT

NOW, THEREFORE, in consideration of the foregoing and of the mutual covenants and agreements contained herein, and intending to be legally bound hereby, the parties hereto hereby agree as follows:

1. . Each Stockholder, with respect to such Stockholder’s Shares, severally and not jointly, at any
meeting of the Stockholders of the Company or at any adjournment thereof, and in any action by written consent of the Stockholders of the Company (which written consent shall be delivered promptly, and in any event within forty eight
(48) hours, after the Company requests such delivery) or in any other circumstances