Form 8-K

8-K — GigCapital7 Corp.

Accession: 0001193125-26-162774

Filed: 2026-04-20

Period: 2026-04-16

CIK: 0002023730

SIC: 4911 (ELECTRIC SERVICES)

Item: Entry into a Material Definitive Agreement

Item: Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

Item: Regulation FD Disclosure

Item: Other Events

Item: Financial Statements and Exhibits

Documents

8-K — d144257d8k.htm (Primary)

EX-2.1 (d144257dex21.htm)

EX-10.1 (d144257dex101.htm)

EX-99.1 (d144257dex991.htm)

EX-99.2 (d144257dex992.htm)

EX-99.3 (d144257dex993.htm)

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8-K

8-K (Primary)

Filename: d144257d8k.htm · Sequence: 1

8-K

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (date of earliest event reported): April 16, 2026

GigCapital7 Corp.

(Exact name of Registrant as specified in its charter)

Cayman Islands

001-42262

98-1790710

(State or other jurisdiction of

incorporation or organization)

(Commission

File Number)

(I.R.S. Employer

Identification Number)

1731 Embarcadero Rd., Suite 200

Palo Alto, CA 94303

(Address of principal executive offices)

(650) 276-7040

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☒

Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐

Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐

Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐

Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e 4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading

Symbols

Name of each exchange

on which registered

Units, each consisting of one Class A ordinary share and one redeemable warrant

GIGGU

The Nasdaq Stock Market LLC

Class A ordinary shares, par value $0.0001 per share

GIG

The Nasdaq Stock Market LLC

Redeemable warrants, each full warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share

GIGGW

The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 1.01

Entry into a Material Definitive Agreement.

As GigCapital7 Corp., a Cayman Islands exempted company (“GigCapital7”), previously disclosed in its Current Report on Form 8-K filed with the U.S. Securities and Exchange Commission (the “SEC”) on September 29, 2025, GigCapital7 entered into a Business Combination Agreement (the “Business Combination Agreement”), dated as of September 27, 2025, by and among GigCapital7, MMR Merger Sub, Inc., a Delaware corporation and a direct wholly owned subsidiary of GigCapital7 (“Merger Sub”), and Hadron Energy, Inc., a Delaware corporation (the “Company”), pursuant to which, among other things and subject to the terms and conditions contained therein, Merger Sub will merge with and into the Company (the “Merger”), with the Company continuing as the surviving company (the Company, in its capacity as the surviving corporation of the Merger, is sometimes referred to as the “Surviving Company”). The Business Combination Agreement was subsequently amended by the First Amendment to Business Combination Agreement, dated as of December 12, 2025, by and among GigCapital7, Merger Sub, and the Company (the “First Amendment”).

The Business Combination Agreement provides that the Aggregate Merger Consideration (as such term is defined in the Business Combination Agreement) to be issued for the securities of the Company shall be equal to (a)(i) the “Public Company (Pre-Capital Raise) Valuation” of $1,200,200,000, divided by (b) $10.59, less (b) 13,333,333 shares of Domesticated Purchaser Common Stock (as such term is defined in the Business Combination), or a total of 100,000,000 shares of Domesticated Purchaser Common Stock, which at a nominal value of $10.00 per share would have a valuation for the Company of $1 billion. On April 16, 2026, GigCapital7, Merger Sub, and the Company entered into a Second Amendment to Business Combination Agreement (the “Second Amendment”), which amends the Business Combination Agreement to (a) adjust the valuation of the Company and (b) extend the Outside Date. The Second Amendment amends the definition of “Public Company (Pre-Capital Raise) Valuation” set forth in Article X of the Business Combination Agreement to mean $776,599,997, which has the effect of reducing the Aggregate Merger Consideration to be issued for the securities of the Company to 60,000,000 shares of Domesticated Purchaser Common Stock, which at a nominal value of $10.00 per share would have a valuation for the Company of $600 million. The Second Amendment also amends Section 8.01(c) of the Business Combination Agreement to replace the date “April 30, 2026” with the date “May 31, 2026.” As a result, all references to the “Outside Date” in the Business Combination Agreement now refer to May 31, 2026. Other than as modified by the Second Amendment, all terms, conditions, and provisions of the Business Combination Agreement, as previously amended, remain in full force and effect.

The foregoing description of the Second Amendment does not purport to be complete and is qualified in its entirety by reference to the full text of the Second Amendment, a copy of which is filed as Exhibit 2.1 to this Current Report and is incorporated herein by reference.

Item 2.03

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

On April 16, 2026, GigCapital7 issued an amended and restated unsecured convertible promissory note (the “Amended and Restated Working Capital Note”) in the principal amount of $293,000.00 to GigAcquisitions7 Corp., a Cayman Islands exempted company (the “Sponsor”). The Amended and Restated Working Capital Note amends, restates, supersedes and replaces that certain unsecured convertible promissory note dated January 30, 2026, in the principal amount of $148,000 previously issued by GigCapital7 to the Sponsor (the “Prior Note”). The Company issued the Amended and Restated Working Capital Note in consideration for a loan from the Sponsor to fund GigCapital7’s working capital requirements. The Amended and Restated Working Capital Note is convertible at the Sponsor’s election upon the consummation of the initial business combination. Upon such election, the convertible note will convert, at a price of $10.00 per unit, into units identical to the private placement units issued in connection with the Company’s initial public offering.

The Amended and Restated Working Capital Note bears no interest and is repayable in full upon the consummation of a business combination by GigCapital7, except that the Amended and Restated Working Capital Note may be converted, at the sole election of our Sponsor, into units of GigCapital7 at the consummation of GigCapital7’s initial business combination.

A copy of the Amended and Restated Working Capital Note is attached as Exhibit 10.1 to this Current Report on Form 8-K and is incorporated herein by reference. The disclosure as set forth in this Item 2.03 is intended to be a summary only and is qualified in its entirely by reference to such Note.

Item 7.01

Regulation FD Disclosure.

On April 20, 2026, GigCapital7 and the Company issued a joint press release announcing, among other things, the reduction in valuation of the Company (the “Press Release”). A copy of the Press Release is attached to this Current Report as Exhibit.

The information in this Item 7.01 (including Exhibit 99.1) is being furnished pursuant to Item 7.01 and will not be deemed to be filed for purposes of Section 18 of the Securities Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor will it be deemed incorporated by reference in any filing of GigCapital7 under the Securities Act, or the Exchange Act, regardless of any general incorporation language in such filings.

Item 8.01

Other Events.

Investor Presentation

In connection with the issuance of the Press Release, on April 20, 2026, GigCapital7 also made available an updated investor presentation reflecting the revised terms of the Business Combination Agreement, including the reduction of the Aggregate Merger Consideration to be issued for the securities of the Company to 60,000,000 shares of Domesticated Purchaser Common Stock, which at a nominal value of $10.00 per share would have a valuation for the Company of $600 million. A copy of the investor presentation is furnished as Exhibit 99.2 to this Current Report on Form 8-K and incorporated herein by reference.

Supplement to the Proxy Statement

On April 15, 2026, GigCapital7 filed its proxy statement/prospectus (the “Proxy Statement”) for the solicitation of proxies in connection with the upcoming extraordinary general meeting (the “Extraordinary General Meeting”) to consider and vote on its proposed business combination (the “Business Combination”) and other matters as described in the registration statement and a prospectus relating to the offer of the securities to be issued to the stockholders of the Company in connection with the Business Combination.

GigCapital7 has decided to supplement the Proxy Statement (the “Proxy Supplement”) to provide updated information about the Second Amendment and the Amended and Restated Promissory Note. There is no change to the date, location, the record date, redemption deadline or any of the other proposals to be acted upon at the Extraordinary General Meeting.

Stockholders who have previously submitted their proxies or otherwise voted and who do not want to change their vote need not take any action. Stockholders as of the April 15, 2026, record date can vote, even if they have subsequently sold their shares. Stockholders who wish to withdraw their previously submitted redemption requests may do so prior to the Extraordinary General Meeting by requesting that the transfer agent return such shares prior to the Extraordinary General Meeting.

A copy of the Proxy Supplement is filed herewith as Exhibit 99.3 and is incorporated to herein by reference.

The information in this Item 8.01 (including Exhibits 99.2 and 99.3) is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

Item 9.01

Financial Statements and Exhibits.

(d) Exhibits:

Exhibit

Description

2.1

Second Amendment to Business Combination Agreement, dated as of April 16, 2026, by and among GigCapital7 Corp., MMR Merger Sub, Inc., and Hadron Energy, Inc.

10.1

Amended and Restated Promissory Note, dated April 16, 2026

99.1

Press Release dated April 20, 2026

99.2

Investor Presentation, April 2026

99.3

Proxy Supplement, dated as of April 20, 2026

104

Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: April 20, 2026

GIGCAPITAL7 CORP.

By:

/s/ Dr. Avi S. Katz

Name:

Dr. Avi S. Katz

Title:

Chief Executive Officer

EX-2.1

EX-2.1

Filename: d144257dex21.htm · Sequence: 2

EX-2.1

Exhibit 2.1

SECOND AMENDMENT TO BUSINESS COMBINATION AGREEMENT

This Second Amendment to Business Combination Agreement (this “Amendment”) is entered into as of April 16, 2026, 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) (“Purchaser”), MMR Merger Sub, Inc., a Delaware corporation

and a direct wholly owned subsidiary of Purchaser (“Merger Sub”), and Hadron Energy, Inc., a Delaware corporation (the “Company,” and together with Purchaser and Merger Sub, the “Parties,” and

each, a “Party”). Capitalized terms used but not defined herein shall have the meanings ascribed to such terms in the Business Combination Agreement (as defined below).

RECITALS

WHEREAS, the

Parties are parties to that certain Business Combination Agreement, dated as of September 27, 2025, as amended by that First Amendment to Business Combination Agreement dated December 12, 2025 (together, the “Business Combination

Agreement” or “BCA”), pursuant to which the Company intends to merge with Merger Sub, with the Company surviving the merger as a wholly owned subsidiary of Purchaser;

WHEREAS, Section 9.10 of the BCA provides that the BCA may be amended, supplemented or modified only by execution of a written instrument

signed by Purchaser and the Company;

WHEREAS, the Effective Time has not occurred as of the date hereof; and

WHEREAS, the Parties desire to amend the BCA to (a) adjust the valuation of the Company, and (b) extend the Outside Date, in each

case as set forth herein.

NOW, THEREFORE, in consideration of the mutual promises and the covenants set forth herein and for other good

and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Parties agree as follows:

AGREEMENT

1. Amendment to definition of “Public Company (Pre-Capital Raise)

Valuation”. The definition of “Public Company (Pre-Capital Raise) Valuation” set forth in Article X of the BCA is hereby amended and restated in its entirety as follows:

“Public Company (Pre-Capital Raise) Valuation” means $776,599,997 (Seven Hundred Seventy-Six Million Five Hundred Ninety-Nine Thousand Nine Hundred Ninety-Seven United States Dollars).

2. Amendment to Outside Date. Section 8.01(c) of the Business Combination Agreement is hereby amended by replacing the date

“April 30, 2026” with the date “May 31, 2026”. All references to the “Outside Date” in the BCA shall be deemed to refer to May 31, 2026.

3. No Other Amendments. Except as expressly set forth in this Amendment, all

terms, conditions and provisions of the BCA shall remain in full force and effect and are hereby confirmed and ratified. In the event of any conflict between the terms of this Amendment and the BCA, the terms of this Amendment shall control.

4. Interpretation. The rules of construction set forth in Section 9.12 of the BCA are incorporated herein by reference,

mutatis mutandis.

5. Governing Law; Jurisdiction; Specific Performance. This Amendment shall be governed by, and construed

in accordance with, the Laws of the State of Delaware, without giving effect to principles or rules of conflict of Laws to the extent such principles or rules would require or permit the application of Laws of another jurisdiction; provided that,

for the avoidance of doubt, the Laws of the Cayman Islands shall also apply to and, as applicable, govern the Domestication. The provisions of Sections 9.06 and 9.08 of the BCA shall apply to this Amendment as if set forth herein in full.

6. Counterparts; Electronic Signatures. This Amendment may be executed and delivered (including by DocuSign or other electronic

transmission) in counterparts, each of which shall be deemed an original, and all of which together shall constitute one and the same instrument.

[Signature Page Follows]

IN WITNESS WHEREOF, the Parties have caused this Amendment to be executed as of the date

first written above by their respective duly authorized officers.

THE PURCHASER:

GIGCAPITAL7 CORP.

By:

/s/ Dr. Avi Katz

Name: Dr. Avi Katz

Title: Chief Executive Officer

MERGER SUB:

MMR MERGER SUB, INC.

By:

/s/ Dr. Raluca Dinu

Name: Dr. Raluca Dinu

Title: Chief Executive Officer

THE COMPANY:

HADRON ENERGY, INC.

By:

/s/ Samuel Gibson

Name: Samuel Gibson

Title: Founder & CEO

EX-10.1

EX-10.1

Filename: d144257dex101.htm · Sequence: 3

EX-10.1

Exhibit 10.1

THIS PROMISSORY NOTE (“NOTE”) HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”). THIS NOTE

HAS BEEN ACQUIRED FOR INVESTMENT ONLY AND MAY NOT BE SOLD, TRANSFERRED OR ASSIGNED IN THE ABSENCE OF REGISTRATION OF THE RESALE THEREOF UNDER THE SECURITIES ACT OR AN OPINION OF COUNSEL REASONABLY SATISFACTORY IN FORM, SCOPE AND SUBSTANCE TO THE

COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED.

AMENDED AND RESTATED PROMISSORY NOTE

April 16, 2026

Principal

Amount: $293,000

GigCapital7 Corp., a Cayman Islands exempted company (the “Maker”), promises to pay to the order of

GigAcquisitions7 Corp., a Cayman Islands exempted company, or its registered assigns or successors in interest (the “Payee”), or order, the principal sum of Two Hundred and Ninety-Three Thousand Dollars ($293,000.00) in

lawful money of the United States of America, on the terms and conditions described below. All payments on this Note shall be made by check or wire transfer of immediately available funds or as otherwise determined by the Maker to such account

as the Payee may from time to time designate by written notice in accordance with the provisions of this Note.

1. Principal. The principal balance of this Note shall be payable by the Maker on the earlier of: (i) the date on which

Maker consummates its initial business combination or (ii) the date that the winding up of the Maker is effective (such date, the “Maturity Date”). The principal balance may be prepaid at any time, at the election of Maker.

Under no circumstances shall any individual, including but not limited to any executive officer, director, employee or stockholder of the Maker, be obligated personally for any obligations or liabilities of the Maker hereunder.

2. Interest. No interest shall accrue on the unpaid principal balance of this Note.

3. Optional Conversion.

(a) Upon consummation of the

business combination and at the Payee’s option, at any time prior to payment in full of the principal balance of this Note, the Payee may elect to convert all or any portion of the Note into that number of units of the post-business

combination entity (the “New Units”) equal to: (i) the portion of the principal amount of the Note being converted pursuant to this Section 3, divided by (ii) $10.00, rounded down to the nearest whole number. Each New

Unit shall have the same terms and conditions as private placement units issued simultaneously with the Maker’s initial public offering.

(b) Upon

any complete or partial conversion of the principal amount of this Note (i) such principal amount shall be so converted and such converted portion of this Note shall become fully paid and satisfied, (ii) the Payee shall surrender and

deliver this Note, duly endorsed, to Maker or such other address which Maker shall designate against delivery of the New Units, (iii) Maker shall promptly deliver a new duly executed Note to the Payee in the principal amount that remains

outstanding, if any, after any such conversion and (iv) in exchange for all or any portion of the surrendered Note described in Section 3(a), Maker shall deliver to Payee the New Units, which shall bear such legends as are required, in the

opinion of counsel to Maker or by any other agreement between Maker and the Payee and applicable state and federal securities laws.

(c) The Maker shall

pay any and all issue and other taxes that may be payable with respect to any issue or delivery of the New Units upon conversion of this Note pursuant hereto; provided, however, that the Payee shall pay any transfer taxes resulting from any transfer

requested by the Payee in connection with any such conversion.

4. Application of Payments. All payments shall be applied first to payment in

full of any costs incurred in the collection of any sum due under this Note, including (without limitation) reasonable attorney’s fees, then to the payment in full of any late charges and finally to the reduction of the unpaid principal

balance of this Note.

5. Events of Default. The following shall constitute an event of default (“Event of

Default”):

(a) Failure to Make Required Payments. Failure by Maker to pay the principal amount due

pursuant to this Note within five (5) business days of the date specified above.

(b) Voluntary Bankruptcy, Etc. The commencement

by Maker of a voluntary case under any applicable bankruptcy, insolvency, reorganization, rehabilitation or other similar law, or the consent by it to the appointment of or taking possession by a receiver, liquidator, assignee, trustee, custodian,

sequestrator (or other similar official) of Maker or for any substantial part of its property, or the making by it of any assignment for the benefit of creditors, or the failure of Maker generally to pay its debts as such debts become due, or the

taking of corporate action by Maker in furtherance of any of the foregoing.

(c) Involuntary Bankruptcy, Etc. The entry of a decree or

order for relief by a court having jurisdiction in the premises in respect of Maker in an involuntary case under any applicable bankruptcy, insolvency or other similar law, or appointing a receiver, liquidator, assignee, custodian, trustee,

sequestrator (or similar official) of Maker or for any substantial part of its property, or ordering the winding-up or liquidation of its affairs, and the continuance of any such decree or order

unstayed and in effect for a period of 60 consecutive days.

6. Remedies.

(a) Upon the occurrence and during the continuance of an Event of Default specified in Section 5(a) hereof, Payee may, by written notice to Maker,

declare this Note to be due immediately and payable, whereupon the unpaid principal amount of this Note, and all other amounts payable hereunder, shall become immediately due and payable without presentment, demand, protest or other notice of any

kind, all of which are hereby expressly waived, anything contained herein or in the documents evidencing the same to the contrary notwithstanding.

(b)

Upon the occurrence and during the continuance of an Event of Default specified in Sections 5(b) and 5(c), the unpaid principal balance of this Note, and all other sums payable with regard to this Note, shall automatically and immediately become due

and payable, in all cases without any action on the part of Payee.

7. Waivers. Maker and all endorsers and guarantors of,

and sureties for, this Note waive presentment for payment, demand, notice of dishonor, protest, and notice of protest with regard to the Note, all errors, defects and imperfections in any proceedings instituted by Payee under the terms of this Note,

and all benefits that might accrue to Maker by virtue of any present or future laws exempting any property, real or personal, or any part of the proceeds arising from any sale of any such property, from attachment, levy or sale under execution, or

providing for any stay of execution, exemption from civil process, or extension of time for payment; and Maker agrees that any real estate that may be levied upon pursuant to a judgment obtained by virtue hereof or any writ of execution issued

hereon, may be sold upon any such writ in whole or in part in any order desired by Payee.

8. Unconditional

Liability. Maker hereby waives all notices in connection with the delivery, acceptance, performance, default, or enforcement of the payment of this Note, and agrees that its liability shall be unconditional, without regard to the liability

of any other party, and shall not be affected in any manner by any indulgence, extension of time, renewal, waiver or modification granted or consented to by Payee, and consents to any and all extensions of time, renewals, waivers, or modifications

that may be granted by Payee with respect to the payment or other provisions of this Note, and agrees that additional makers, endorsers, guarantors, or sureties may become parties hereto without notice to Maker or affecting Maker’s liability

hereunder.

9. Notices. All notices, statements or other documents which are required or contemplated by this Note shall be

made in writing and delivered: (i) personally or sent by first class registered or certified mail, overnight courier service or facsimile or electronic transmission to the address designated in writing, (ii) by facsimile to the number most

recently provided to such party or such other address or fax number as may be designated in writing by such party or (iii) by electronic mail, to the electronic mail address most recently provided to such party or such other electronic mail

address as may be designated in writing by such party. Any notice or other communication so transmitted shall be deemed to have been given on the day of delivery, if delivered personally, on the business day following receipt of written

confirmation, if sent by facsimile or electronic transmission, one (1) business day after delivery to an overnight courier service or five (5) days after mailing if sent by mail.

10. Construction. THIS NOTE SHALL BE CONSTRUED AND ENFORCED IN ACCORDANCE WITH THE LAWS OF CALIFORNIA, WITHOUT REGARD TO

CONFLICT OF LAW PROVISIONS THEREOF.

11. Severability. Any provision contained in this Note which is prohibited or

unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective to the extent of such prohibition or unenforceability without invalidating the remaining provisions hereof, and any such prohibition or unenforceability in any

jurisdiction shall not invalidate or render unenforceable such provision in any other jurisdiction.

12. Trust Waiver. Notwithstanding anything herein to the contrary, the Payee

hereby waives any and all right, title, interest or claim of any kind (“Claim”) in or to any distribution of or from the trust account (the “Trust Account”) established in connection with Maker’s initial

public offering, and hereby agrees not to seek recourse, reimbursement, payment or satisfaction for any Claim against the Trust Account for any reason whatsoever; provided however that upon the consummation of the initial business combination, Maker

shall repay the principal balance of this Note out of the proceeds released to Maker from the Trust Account.

13. Amendment;

Waiver. Any amendment hereto or waiver of any provision hereof may be made with, and only with, the written consent of the Maker and the Payee.

14. Restatement. This Note amends, restates, supersedes and replaces that certain Promissory Note dated January 30, 2026,

made in the principal amount of One Hundred and Forty-Eight Thousand Dollars ($148,000.00) by Maker, payable to Payee (the “Prior Note”); provided, however, that the execution and delivery by the undersigned of this Note shall

not, in any manner or circumstance, be deemed to be a payment of, a novation of or to have terminated, extinguished or discharged any of Maker’s indebtedness evidenced by the Prior Note, all of which indebtedness shall continue under and shall

hereinafter be evidenced and governed by this Note. Any inconsistency between the terms of this Note and the Prior Note shall be controlled by the terms hereof.

15. Assignment. No assignment or transfer of this Note or any rights or obligations hereunder may be made by any party hereto (by operation of law or

otherwise) without the prior written consent of the other party hereto and any attempted assignment without the required consent shall be void.

[Signature page follows]

IN WITNESS WHEREOF, Maker, intending to be legally bound hereby, has caused this Note

to be duly executed by the undersigned as of the day and year first above written.

GIGCAPITAL7 CORP.

By:

/s/ Christine Marshall

Name: Christine Marshall

Title: Chief Financial Officer

GIGACQUISITIONS7 CORP.

By:

/s/ Dr. Avi S. Katz

Name: Dr. Avi S. Katz

Title: Chief Executive Officer

EX-99.1

EX-99.1

Filename: d144257dex991.htm · Sequence: 4

EX-99.1

Exhibit 99.1

Hadron Energy Aligns Valuation for Business Combination to $600M, Signaling Long Term Market Discipline After GigCapital7 Form S-4 Registration Statement Declared Effective

Revised previously announced Pro-Forma Equity Valuation of Hadron

Energy to $600 Million Reflects Disciplined Market Alignment and Investor Responsiveness; Hadron Energy Completes approximately $7.5 Million in Pre-IPO Equity Round via bridge SAFE Notes with Full Conversion

Protections Preserved; SEC Declared GigCapital7-Hadron Energy Form S-4 Registration Statement Effective on April 15, 2026; GigCapital7 Special Shareholders meeting to take place on May 7, 2026;

Hadron Energy Continues to Advance Supplier Partnerships, Customer Pipeline, and Licensing Milestones

NEW YORK, NY –

April 20, 2026 – Hadron Energy, Inc. (“Hadron” or the “Company”), a developer of advanced nuclear microreactor (MMR) technology, today announced two significant milestones on its path to becoming

a publicly traded company to be listed on the Nasdaq Stock Market under the ticker symbol “HDRN.” First, Hadron and GigCapital7 have agreed to updated transaction terms reflecting a modified

pro-forma equity valuation of Hadron of approximately $600 million to align with current public market conditions and the Company’s commitment to entering the public markets from a position of

credibility and long-term strength. Second, the U.S. Securities and Exchange Commission (“SEC”) declared the Form S-4 registration statement of GigCapital7 Corp. (Nasdaq: GIG)

(“GigCapital7”), for which the Company is a co-registrant, effective on April 15, 2026, enabling GigCapital7 to proceed with its special shareholders meeting to seek approval by its

shareholders of the proposed business combination on May 7, 2026.

In connection with the updated transaction terms, Hadron also announced the successful completion of a

$7.5 million pre-IPO equity financing round conducted via Simple Agreements for Future Equity (“SAFE”) notes. The round was anchored by a number of strategic investors with deep alignment to

Hadron’s commercial and technology roadmap, reinforcing institutional confidence in the Company’s fundamentals and long-term trajectory ahead of its public listing.

A Market-Aligned Valuation Built for Strength, Not Sentiment

The advanced nuclear and small modular reactor sector has experienced a meaningful valuation recalibration since the market peak in Q4 2025. Publicly traded

peers, including companies with NRC design approvals and multi-billion-dollar market capitalizations, have seen equity values decline from their late-2025 highs.

Rather than proceed with a transaction structure anchored to a prior market environment, Hadron and GigCapital7 have elected to proactively realign the

transaction valuation of Hadron to reflect the objective realities of today’s capital markets. This decision is the product of extensive dialogue with a broad cross-section of institutional investors and strategic capital partners over the

past four months of SAFE bridge and deSPAC PIPE funding roadshows.

“We are building Hadron for the long term, and that means making decisions that

prioritize credibility over optics,” said Sam Gibson, Founder & CEO of Hadron Energy. “The advanced nuclear market has undergone a healthy and necessary value reset. We believe the right response is not to resist that reset but

to lead through it. By entering the public markets at a valuation that reflects current conditions and an attractive entry point, we are sending a clear signal to investors: Hadron is fully attuned to market realities, disciplined in its capital

planning, and focused on execution.”

The revised $600 million valuation of Hadron is designed to achieve three core objectives: first, to

materially reduce redemption risk and maximize the cash available to the Company at close; second, to attract quality institutional capital that will serve as a foundation for the Company’s public float; and third, to position the Company for

a credible, supported aftermarket that builds investor trust from day one.

GigCapital7 Reaffirms Commitment to Hadron and the Transaction

“With the Form S-4 now effective and a clear path to closing in front of us through the shareholders meeting that

is scheduled for May 7, 2026, GigCapital7 holds its excitement of the opportunity to be part of the MMR industry and remains fully committed to Hadron through the deSPAC and in supporting the Company’s long-term success in the public

markets,” said Dr. Avi Katz, Chairman & CEO of GigCapital7. “This valuation adjustment is a strategic decision that reflects our collective commitment to delivering a transaction that closes with strength, raises the

capital the Company needs, and establishes a foundation of trust with long-term institutional investors. We are sure that proceeding to a final prospectus/proxy statement and realigning the valuation of Hadron in the same window sends a simple,

decisive message to the market.”

SEC Declares Form S-4 Registration Statement Effective; Path to

Nasdaq Listing Cleared

On April 15, 2026, the SEC declared GigCapital7’s Form S-4 registration

statement, of which Hadron was a co-registrant, effective, completing a critical milestone in the path to closing the proposed business combination. GigCapital7 has commenced distribution of the final

prospectus/proxy statement/prospectus to its shareholders in advance of the May 7, 2026 special meeting to vote on the proposed business combination.

“Filing and mailing the final prospectus/proxy statement to GigCapital7’s shareholders is a decisive moment,” said Sam Gibson,

Founder & CEO of Hadron. “With the Form S-4 now effective, Hadron is positioned to complete its transition to the public markets on a known and executable timeline. Combined with our

recalibrated valuation and continued commercial and technical progress, we are entering this final phase of the deSPAC process with clarity, momentum, and the full confidence of our partners and investors.”

$7.5 Million Pre-IPO Equity Round Reinforces Investor Confidence

Hadron’s successful completion of a $7.5 million equity financing via bridge SAFE notes demonstrates continued investor appetite for the

Company’s differentiated position in the advanced nuclear market. The round was conducted alongside the ongoing deSPAC roadshow process and reflects investor conviction in Hadron’s technology, team, and go-to-market approach. The pre-IPO capital further strengthens Hadron’s balance sheet as it enters the public markets and provides near-term working capital to

support continued commercial development, supplier engagement, and licensing activities.

Commercial and Technical Momentum Continues to Accelerate

The updated valuation reflects market conditions, not a change in the Company’s fundamentals or commercial trajectory. Hadron continues to

advance across every dimension of its business, with significant recent milestones that underscore the strength and credibility of its technology and go-to-market

strategy:

Supplier Ecosystem Development: In March 2026, Hadron announced a strategic collaboration with Paragon Energy Solutions, a Mirion

Technologies Company, for the design, development, and implementation of the Instrumentation & Control (I&C) architecture for the Halo Micro-Modular Reactor (MMR). This collaboration encompasses safety and

non-safety I&C platform integration, control logic development, human-machine interface support, and cybersecurity architecture representing a critical subsystem milestone on the path to commercial

deployment. Paragon’s proven supply chain capability, backed by Mirion’s global nuclear technology platform, validates the manufacturability and commercial readiness of Hadron’s reactor design.

Customer Pipeline and Commercial Traction: Hadron has signed a

non-binding Memorandum of Understanding with Smartland Energy, LLC, establishing a portfolio-scale framework for the potential deployment of the Halo MMR across up to five qualified Smartland behind-the-meter power projects over time. Smartland is developing approximately 150 MWe per project, with 12 projects targeted for completion by 2035, representing aggregate

capacity demand of approximately 1.8 GWe. In connection with the MOU, Smartland made an initial strategic investment in Hadron, reflecting long-term conviction in the platform’s commercial viability.

Accelerating Market Demand: Industrial and digital infrastructure operators are facing unprecedented load growth, multi-year grid interconnection

queues, and increasing urgency around reliable, on-site firm power. Behind-the-meter nuclear microreactors represent one of the

most compelling solutions to this structural supply-demand imbalance. The U.S. Department of Energy and major hyperscale technology companies continue to signal strong support for advanced nuclear reactors deployment, and Hadron’s 10 MWe

light-water Halo MMR is purpose-designed for this market—factory-fabricated, truck-transportable, and deployable on commercially relevant timelines.

Licensing and Regulatory Progress: Hadron continues to advance its regulatory engagement with the U.S. Nuclear Regulatory Commission (NRC) as it

progresses toward licensing milestones for the Halo MMR. The Company’s light-water reactor design leverages the most mature, well-understood, and extensively regulated reactor technology in the world, supported by decades of operational data,

an established fuel supply chain, and the deepest bench of regulatory precedent in the nuclear industry.

Transaction Overview

With the Form S-4 registration statement declared effective by the SEC on April 15, 2026, the business combination

between Hadron Energy and GigCapital7 Corp. is expected to close in May, subject to remaining customary closing conditions, including approval by GigCapital7 shareholders at the upcoming special shareholders meeting and satisfaction of customary

Nasdaq listing requirements. Upon closing, Hadron is expected to trade on the Nasdaq Stock Market under the ticker symbol “HDRN,” and is expected to be the first publicly traded company focused on light-water micro-modular reactor (MMR)

technology.

The revised transaction reflects a pro-forma equity valuation Hadron of approximately

$600 million and is structured to maximize net cash to the combined company at close, support a healthy public float, and position the stock for institutional ownership and long-term value creation.

About Hadron Energy, Inc.

Hadron is a pioneer in MMR

technology. Designed to deliver 10 MWe of power, Hadron’s MMR will be smaller, more cost-effective, and faster to deploy than other proposed MMR power solutions. The revolutionary design of Hadron’s MMR allows its reactor vessel, core,

and containment shell to be truck transportable, providing a versatile deployment model for end users. Whether powering an artificial intelligence data center, remote community, or an industrial hub, Hadron’s MMR is expected to provide a

reliable, safe and scalable nuclear energy solution.

For more information, please visit https://www.hadronenergy.com/

About GigCapital7 Corp.

GigCapital7 Corp. is a Private-to-Public Equity (PPE)™ company, also known as a special purpose acquisition company (SPAC), with a Mentor-Investor™ methodology and a mission to partner with a

high technology differentiating company to forge a successful path to the public markets through a business combination. GigCapital7 Corp. aims to partner with an innovative company with exceptional leaders in order to create an industry-leading

partnership that will be successful for years to come.

Private-to-Public

Equity (PPE)™ and “Mentor-Investor™ are trademarks of GigManagement, LLC, a member entity of GigCapital Global and affiliate of

GigCapital7 Corp., used pursuant to agreement.

Forward-Looking Statements

This press release includes certain statements that may be considered forward-looking statements within the meaning of the federal securities laws.

Forward-looking statements include, without limitation, statements about future events or Hadron’s or GigCapital7’s future financial or operating performance. For example, statements regarding the closing of the business combination,

including its anticipated , the listing of the combined company on Nasdaq, the level of potential redemptions by public shareholders of GigCapital, the strategic collaboration between Hadron and Smartland, and any potential deployment of

Hadron’s Halo MMR in connection therewith; the development and translation into an operational reactor of the Hadron Halo MMR, and its subsequent construction and performance, including with respect to quality control and safety;

Hadron’s anticipated growth and other metrics; the anticipated future demand of energy; the future demand and commercialization of the Hadron Halo MMR; potential relationships or engagements; the outcome of Hadron’s regulatory

submissions; and statements regarding the benefits of the business combination between the parties are all forward-looking statements. In some cases, you can identify forward-looking statements by terminology such as “may,”

“should,” “could,” “might,” “plan,” “possible,” “project,” “strive,” “budget,” “forecast,” “expect,” “intend,”

“will,” “estimate,” “anticipate,” “believe,” “predict,” “potential” or “continue,” or the negatives of these terms or variations thereof or similar terminology.

These forward-looking statements regarding future events and the future results of Hadron and GigCapital7

are based upon estimates and assumptions that, while considered reasonable by Hadron, GigCapital7, and their respective management teams, are inherently uncertain and subject to risks, variability and contingencies, many of which are beyond

Hadron’s or GigCapital7’s control. Factors that may cause actual results to differ materially from current expectations include, but are not limited to: the occurrence of any event, change or other circumstances that could give rise to

the termination of the business combination agreement or other definitive agreements in connection thereto; the outcome of any legal proceedings that may be instituted against Hadron, GigCapital7 or others following the announcement of the business

combination and any definitive agreements with respect thereto; the inability to complete the business combination due to the failure to obtain consents and approvals of the shareholders of GigCapital7; failure to obtain financing to complete the

business combination or to satisfy other conditions to closing; delays or failures to obtain necessary regulatory approvals required to complete the business combination or related transactions; changes to the proposed structure of the business

combination as a result of applicable laws, regulations or conditions; projections, estimates and forecasts of revenue and other financial and performance metrics; projections about industry trends and market opportunity; expectations relating to

the demand for Hadron’s Halo MMR; Hadron’s ability to scale and grow its business; the cash position of Hadron following closing of the business combination; the ability to meet listing standards in connection with, and following, the

consummation of the business combination the risk that the business combination disrupts current plans and operations of Hadron as a result of the announcement and consummation of the business combination; the ability to recognize the anticipated

benefits of the business combination, which may be affected by, among other things, competition, the ability of Hadron to successfully commercialize its Halo MMR, and Hadron’s ability to source and maintain key relationships with management

and key employees; costs related to the business combination; changes in applicable laws and regulations; political and economic developments and market volatility; the risk that Hadron does not ever enter into any definitive agreements in

connection with commercialization of its technology; the risk that Hadron is pursuing an emerging market; and other risks and uncertainties set forth under “Risk Factors” and other documents filed, or to be filed, with the SEC by

GigCapital7 and/or Hadron, including the registration statement on Form S-4 that Hadron and GigCapital7 filed in connection with the business combination (the “Registration Statement”).

If any of these risks materialize or Hadron’s assumptions prove incorrect, actual results could differ

materially from the results implied by the forward-looking statements. There may be additional risks that Hadron or GigCapital7 do not presently know or currently believe are immaterial that could also cause actual results to differ from those

contained in the forward-looking statements. Any forward-looking statements made by or on behalf of Hadron or GigCapital7 reflect the expectations, plans or forecasts of future events and views of Hadron and GigCapital7 and speak only as of the date

they are made. Neither Hadron nor GigCapital7 undertake any obligation to update any forward-looking statements to reflect any changes in their respective expectations with regard thereto or any changes in events, conditions or circumstances on

which any such statement is based. These forward-looking statements should not be relied upon as representing Hadron’s or GigCapital7’s assessments as of any date subsequent to the date of this communication. Accordingly, undue reliance

should not be placed upon the forward-looking statements.

Additional Information About the Transaction and Where to Find It

The proposed transaction will be submitted to GigCapital7’s shareholders for their consideration and approval. GigCapital7 and Hadron have filed with the

SEC the Registration Statement that includes a prospectus relating to the offer of securities to be issued in connection with the business combination and GigCapital7 has filed a final prospectus/definitive proxy statement, to be distributed to

GigCapital7’s shareholders in connection with GigCapital7’s solicitation of proxies for the shareholder vote in connection with the proposed business combination and other matters described in the Registration Statement. GigCapital7 is

mailing the final prospectus/definitive proxy statement and other relevant documents (the “GigCapital7 Shareholder Materials”) to its shareholders as of the record date established for voting on the proposed business combination. BEFORE

MAKING ANY VOTING OR INVESTMENT DECISION, GIGCAPITAL7’S SHAREHOLDERS AND OTHER INTERESTED PARTIES ARE URGED TO READ, WHEN AVAILABLE, THE FINAL PROSPECTUS/DEFINITIVE PROXY STATEMENT AND ALL OTHER RELEVANT DOCUMENTS FILED OR THAT WILL BE FILED

WITH THE SEC IN CONNECTION WITH GIGCAPITAL7’S SOLICITATION OF PROXIES FOR THE EXTRAORDINARY GENERAL MEETING OF ITS SHAREHOLDERS TO BE HELD TO APPROVE THE BUSINESS COMBINATION AND OTHER MATTERS AS DESCRIBED IN THE PROSPECTUS/PROXY STATEMENT

BECAUSE THESE DOCUMENTS CONTAIN IMPORTANT INFORMATION ABOUT GIGCAPITAL7, HADRON AND THE PROPOSED BUSINESS COMBINATION. Shareholders and other interested parties may obtain a copy of these documents, without charge, at the SEC’s website located

at www.sec.gov or by directing a written request to GigCapital7 Corp., Attn: Corporate Secretary, 1731 Embarcadero Rd., Suite 200, Palo Alto, CA.

NEITHER THE SEC NOR ANY STATE SECURITIES REGULATORY AGENCY HAS APPROVED OR DISAPPROVED THE BUSINESS

COMBINATION OR ANY INVESTMENT IN ANY SECURITIES DESCRIBED HEREIN, PASSED UPON THE MERITS OR FAIRNESS OF THE BUSINESS COMBINATION OR ANY RELATED TRANSACTIONS OR PASSED UPON THE ADEQUACY OR ACCURACY OF THE DISCLOSURE IN THIS COMMUNICATION. ANY

REPRESENTATION TO THE CONTRARY CONSTITUTES A CRIMINAL OFFENSE.

Participants in the Solicitation

Hadron, GigCapital7 and their respective directors, executive officers, management and employees, under SEC rules, may be deemed to be participants in a

solicitation of proxies of GIG’s shareholders in connection with the business combination. Investors and shareholders may obtain more detailed information regarding the names, affiliations, and interests of GigCapital7’s directors and

executive officers in its filings with the SEC, including GigCapital7’s Annual Report on Form 10-K for the fiscal year ended December 31, 2025, filed with the SEC on March 6, 2026. Information

regarding the persons who may, under SEC rules, be deemed participants in the solicitation of proxies of GIG shareholders in connection with the business combination is set forth in the Registration Statement, along with information concerning the

interests of Hadron’s and GigCapital7’s participants in the solicitation. Such interests may in some cases be different from those of Hadron’s or GigCapital7’s equity holders generally.

No Offer or Solicitation

This communication does not

constitute an offer to sell or the solicitation of an offer to buy any securities, or a solicitation of any vote or approval, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful

prior to registration or qualification under the securities laws of any such jurisdiction. This communication is not, and under no circumstances is to be construed as, a prospectus, an advertisement or a public offering of the securities described

herein in the United States or any other jurisdiction. No offer of securities shall be made except by means of a prospectus filed with the SEC meeting the requirements of Section 10 of the Securities Act of 1933, as amended, or exemptions

therefrom.

Contacts

Hadron Energy Investor Center:

https://www.hadronenergy.com/investor-relations

Hadron Energy Media & Investor Contact:

Samuel

Gibson

Chief Executive Officer

sgibson@hadronenergy.com

GigCapital7 Investor Contact:

Christine M. Marshall

Chief Financial Officer

christine@gigcapitalglobal.com

EX-99.2

EX-99.2

Filename: d144257dex992.htm · Sequence: 5

EX-99.2

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pre or will be given in, or in ress or implied, aresentations or warranties, expreprinvestment decision by any potential investor and does not constitute investment, tax or legal advice. No r eof, or for esponsibility or liability whatsoever is

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Hadrd-party souressed in the estimates made by the thirom those expresults to differ materially fr, which could cause ree of risk and uncertaintys business and the industry in which it operates is subject to a high degron’Hadr rademarksT

esentation is not intended to, and does not espective owners, and such use or display in this property of their re the prd parties, which aron, GigCapital7 and thiresentation contains trademarks, service marks, trade names, and copyrights of

HadrThis pr esentation may appear without the Ted to in this preferron or GigCapital7. Solely for convenience, the trademarks, service marks, trade names, and copyrights relationship with or an endorsement or sponsorship by or of Hadr, a rimply, SM,

M*, or © , to such trademarks, service marks, trade , their rights or the right of the applicable owners, if anyon or GigCapital7 will not assert, to the fullest extent under applicable law, that Hadre not intended to indicate, in any wayences

arefersymbols, but such r names, and copyrights. esentationApril 2026 Investor Pr 03 rademarksT

ee ArWho WApril 2026 Reliable, ee Carbon-Fr Power TM on HaloThe Hadro

Micr Modular Reactor (MMR) can power next-generation data emote communities, centers, r military bases, factories & e.mor e10 MW 35 MWth 10 year ELECTRICAL POWER THERMAL POWERFUELING CYCLE esentationApril 2026 Investor Pr 04

kerspeaSApril 2026 odayTs ’ Speakers SAMuel gibsonRahul ShukLaROSS

RIDENOUREANDREA EILV a.Drvi katz Founder & CEOCHIEF FINANCIAL OFFICERCHIEF NUCLEAR OFFICERHEAD OF REACOR LICENSINTG (1) ExecutiveChairman of theboard 2X Global Engineering 4 years as Chief 3X Chief Nuclear Officer ector of the Office of the

Dir~40 years of international om American Leader fr, Stem, Accounting Officerwith over 35 years of U.S. Nuclear Regulatory c innoehDeep Tvation and Society of Mechanical Inc.executive experience in Commission (NRC) since ceutixvee leadership

Engineers (ASME).nuclear power2021 20+ years of work Extensive leadership in Founder of giCapital G eer starting in NRC car ch esear5+ years of ross public-experience acrnuclear engineering, GbO,loi alptix, and gG 1992, including a experience in

mechanical company finance, M&A & egulatory licensing, and rgAic quisitions (1-9)G CongessrF llowaionelship and nuclear engineeringcapital marketsfairs afentities in 2003 U.S. Navy Commander eneur and eprVisionary Entr4 years in Senior

Finance (Ret.) withdvis ary ovExe in perienxtensie ecoliead on a prLfi portfolio c eam Builder for Industrial TLeadership, Natera, Inc. & erxpee,includingenci Lensin g,imanagcing of M&A I,,PO and AC e-SPD CompanieseHealth, Inc.ndNuScale ae

thIAEA rulemaeking and mortransactions April2026esentationInvestor Pr (1)Contract Position 05

ectorsdDirof BoarApril2026 samuel gibsonralph hunterbryan timm Chair of

the Audit Committee and Non-Independent BOARD OF DIRECTORS TION member of the Audit and COMPENSA tion member of the Compensa member and Chief Executive OfficerCommittees Committee on and Halo MMR Founder & CEO of HadrecogniGlobally red nuclear

executive with z35 esidentFormer Columbia Sportswear PrCOO// ger with . He is leading a $796m mervisionaryyears of experience in SMR development. Held ent GigCapitalCFO and curr. He 8 Audit Chair GigCapital7 to become the first publicly traded oles

at Orion Nuclear & esidential rCEO and prbrings deep public-company governance, light-water MMR companyConstellationfinance, and capital-marets expertisek dr. raluca dinukermanadrian zuct lewisrober tion Committee Chair of the Compensating AND

Member of the Nominating and member of the Nomina ting and and member of the Nominate GovernanceCorpora and ,te GovernanceCorpora, and the Audit te Governance CommitteeCorporation CommittiescompensaCommittees . CEO of QT Imaging and GigCapital

PartnerUFormer .S. Ambassador to Romania and RC DNeputy Executive Former ector with Dir32 Semiconductor veteran with global gy security . Expert in enerinternational attorneyyears of leadership. Expert in nuclear safety and manufacturing,

operations, and public-egulatory oviding strategic rand geopolitics, prrulemaon on licensing and king, advising Hadr company transaction expertiseand governance leadershipegulatory strategyr raanan horowitzvi dr. atzak ting and Chair of the Nomina

Executive theof Chairman Board, te Governance Committee and Corpora member ofthetion,Compensa tingNomina Member of the Audit Committee teCorpora ANDGovernance Committees Former Elbit Systems of America CEO, scaling 2+GigCapital Founder and serial

PPE issuer with 1 ector the defense firm to $1.6B. A GigCapital7 dirpublic listings. 40-year tech innovator and Ph.D. and national security expert with deep experience engineer with deep publicprivate C-suite / in global manufacturing and

innovationexperience PostClosing ectorsd ofDirBoar 202April esentation6 Investor Pr 06

AMTApril 2026 otal T $5-9B$6-12B$5-18B (1) (2) (3) essable Addr DoW

Fixed Installations Remote Industrial & Mining Data Centers & Hyperscale Fixed Infrastructure OnlyHigh Diesel Displacement24/7 Carbon-Free Demand Market 15-40 Near-term Candidate f-grid Mine Sites50-150 Of50-200 Sites Tier 1: Immediate

business Sites (AFCEC & Army) . development priority on's Immediate users of Hadr esenting low epreactor re r10MW hanging fruit opportunities site DoD¹count and Te om: Offico DOEMderiver Adf f R emote indu²Tstrial M:A Wezie

dMRamckooenote 3D ata center TA site M andcouRnt: IDC esearD ata ch, NucnerElear gyFY202essional Budgon5g Cret PoMwarer ket Outlook 202mb 5;Blooer AgNEFdevand center CNuclear PooSuy:er Prrvewent Intentions mecur Juficsti198);(DOE/CF-0ation ANucFCEC

lear nerEgy Nucklear arMet 5.eport 202Rd Tane Prgychnoloeenes 202cferI5 #US51DC (34825); 2 amC(NECs Initiative upmragoI pr)docum entation.BmblooergNEF AeNucdvan cdlear et arkMReport 2025. esentationApril 2026 Investor Pr 07

AMTApril 2026 Tier 2: Secondary business development priority essable

Marketotal AddrT .e opportunityesent a futureprThese markets r $2-5B$3-8B$4-10B$4-10B Island & Remote Communities AL & UTILITY MICROGRIDS MUNICIPIndustrial Combined Heat & Power Emerging Markets 20-50 Addressable Sites100-400 Addressable

Site200-500 Addressable Siteerm PipelineLong T AM and site count: DOE emote community T4 Island and reactor orAM: EPRI Microgrid T5 Municipal and utility micrAM and outlet 6 Industrial combined heat and power TgNEF Advanced Nuclear AM: Bloomberging

markets T7 Emer eactor Deployment or, MicrgyOffice of Island EnergNEF Advanced Market Assessment 2024; Bloombere: EPRI Industrial Decarbonization Pathways: temperaturMarket Report 2025; The Rockefeller Foundation, The Role Opportunities for Remote

Communities (DOE/EE-2801), Nuclear Market Report 2025.e Envelope emperaturWR TNuclear Heat Applications and Lgy Abundance gy in Powering Universal Enerof Nuclear Ener echnology gy Tging Energy Authority Emer2024; Alaska Ener(EPRI 3002027193),

2024.ging Economies, December 2025. Country eligibility for Emer ogram documentation, 2024. Diesel cost range for Fund preement partners per US limited to US Section 123 Agr ogram Review eactor Proremote communities: INL Micrreements for Peaceful ,

123 AgrgyDepartment of Ener eactor Market Assessment 2024.orFY2024; EPRI Micr, 2026.egistryCooperation r esentationApril 2026 Investor Pr 08

AMTApril 2026 ~30,000TWh$0.15$4.5T (1)(2) Global Electricity Demand by

2026 verage Cost per kWh Global ATED ELECTRICITY MARKETESTIMA Market Size Estimate A Massive Market Opportunity ongly in 2025 and 2026 ow strce: (1) IEA, Demand: Global electricity use to grSour ransitiongy Te, Journalism for the Energy Wirce: (2)

Clean EnerSour 09

ailwindsIndustry TApril 2026 Compelling Industry ailwindT Significant

market and SIGNIFICANT GOVERNMENT A CENTER ENERGY TAI & DAY OF NRC HISTOR ovide egulatory tailwinds prr TSUPPOR DEMANDALAPPROV favorable conditions for ders signed in May 2025, 4 Executive Orom AI data centers alone Electricity demand fre the

only type of eactors arater rLight W om NRC / ANCE Act 2024, and support frADVwill 4X+ by 2030 (1),making MMRs an attractive oval by The U.S. eceived apprdesigns that have r .on EnergyHadr gy DOE / White House bolster the Nuclear Enereliable

powersolution for clean, rNuclear Regulatory Commission, with 94 prior momentumovals, including 1 SMR (2)appr INVESTOR & HYPERSCALER TECHNOLOGICAL GLOAL PUSH FOR LOBW INTERESTANCEMENTSADVBONCAR gy e exploring MMRs for their enerCompanies are

eactor corContinuous advancements in rong push for lowA strgy solutions carbon ener- on engaged in advanced needs, with Hadres, & digital integration for design, safety featurto combat climate change is an important driver discussions for data

center applicationsMMR efficiency and performance based on for MMR markowthet gr Naval Reactor technology gy Agency (1) International Ener (2) United States Nuclear Regulatory Commission 10

indswail TyIndustr6April 202 windsailMicroreactor Policy Tact to

HadronImp ederal F eview edictable rPushes NRC to pursue binding, pron uses LEU+ (not HALEU), a faster Even though Hadr ders Executive Or upport Sor F timelines NRC is equally beneficial for LEU+ designs rump 2025)(T ecycling” of validated

DOE/DOD tests Encourages “rAbility to negotiate pilot sitings on federal sites earlierfor Nuclear demonstration and validation Eases siting on federal land Evidence off a avorable onmental eamlines the nuclear licensing and envirStron

qualifies under MMR guidance, accelerating the Hadr ANCE Act ADV egulatorryor fonment envir ocess eview prrocess eview prr (2024) Nuclear Energ.y Reduces financial barriers and incentivizes new educes technical and Lowers licensing uncertainty and r

eactorsadvanced rfinancial risk ocess for small, factory-built egulatory prQuicker rs on’den on Hadregulatory burSignificantly lower r Nuclear s on’eactors like Hadrrn applicatio Regulatory Use of LEU+ fuel aligns safety and materials

onmental May potentially avoid lengthy envir Commission ecedentsevaluationswith prdlesegulatory hureviews and other rimpactr (NRC) Allocates HALEU, planning fuel supply base, backing Ed fforts signal a favorable policy orientation towar Department

of pilot deployments oeactor prrects j Energy (DOE) oeactor pruilding out the fuel ecosystem, so rBjects DOE supply-chain and industrial base investments t starved for fuelen’areeduce risk for components, and infrastructurr 2026April

esentation nvestor PrI 11

echnologyTApril 2026 One Platform. Endless Energy Applications. edefine

eactors ro modular rs micron’Hadr HALO , serving as both power plants and heat versatility ces for a variety of sectors. By integrating sour ocess heat in one deployable electricity and pr on will unlock new economic value, system, Hadr oject

timelines, and accelerate the shorten pr e gy infrastructurtransition to sustainable ener worldwide esentationApril 2026 Investor Pr 12

echnologyTApril 2026 way alk AA W 1 - Containment Skin ession Pool5 -

Suppr Safe Design e vessel that contains essureactor pr3-4 inch thick steel r ession pool that acts as the oximately 60,000 gallons of water filled supprAppr e, steam generator and primary coolanteactor corthe r Ultimate Heat Sink TM on HaloThe

Hadris designed with five layers of containment. essele Vessur2 - Pr om the outer shell to the fuel Fr e vessel that contains essureactor pr3-4 inch thick steel r e, steam generator and primary coolanteactor corthe r coating, it is designed to be

walk-away-safe and .community friendly conium Cladding3 - Zir e vessel that contains essureactor pr3-4 inch thick steel r e, steam generator and primary coolanteactor corthe r 4 - Fuel Pellet e vessel that contains essureactor pr3-4 inch thick steel

r e, steam generator and primary coolanteactor corthe r esentationApril 2026 Investor Pr 13

echnologyTApril 2026 e Designs Unique Coron’Hadr od oprietary

modular lattice of 15x15 re uses a prs coron’Hadr assemblies which facilitate balanced power distribution, efficient fuel om startup to end-of-lifeuse, and flexible operation fr Modular Scalabilityoved Power FlatteningImpr es a fraction of the

equirOur 10MW rStrategic placement of burnable , ed to wind and solarland comparpoison in the 15×15 array smooths making it the most space-efficient , keeping power eactivityout excess r eliable decarbonizationpath to reoss the cordistribution

even acr Extended Fuel CycleEnhanced Reactor Behavior educed ol means rBetter flux contreactor operation essive rLess aggr localized burnup, enabling longer fuel educes wear and tear on the r efuelingcycles and fewer outages forrol, and system,

allows finer contr educes maintenancer esentationApril 2026 Investor Pr 14

echnologyTApril 2026 Supply Chain Flexibility Operational & oader

supply chain support for Br esulting in eactors rlightwater r cial Commer expedited delivery times Advantages 24/7 Uninterrupted Power ater oven Light-WBuilt on Pr Having a constant power supply is , echnologyReactor T e even a indispensable for

data centers, wher ed for Rapid Engineer brief outage can lead to costly downtime Deployment Ideal for Industrial Applications s 35 MW of thermal power is perfectly Our MMR’ suited for a range of industrial applications ocess heat and

electricityequiring both prr ear LEU+ Fueling Cycle10 Y he 10Tyear low enriched uranium fueling cycle - educes operational costs by drastically r efueling equent reliminating the need for fr esentationApril 2026 Investor Pr 15

echnologyTApril 2026 Decades of Licensing History Regulatory & WRs

have been in commerLcial operation for ~70 years, providing a robust foundation Licensing of operating data and licensing framework Advantages The only NRC approved Reactor s unique design and on’Hadr WRs rLesent 100% of operating repreactors

Licensing Strategy grants key in the U.S. due to their proven technology & egulatory & Licensing r established regulatory familiarity advantages. Compact Modular Design voiding the complex rAegulations of large SMRs, our streamlined are

ensurchitectures faster permitting and flexible deployment oved LEU+ Fuele-ApprPr Utiliing Lowz-Enriched Uranium (ELU leverages ) an established regulatory framework, avoiding the extended approval timelines of exotic fuels April 2026 Investor

Presentation 16

RoadmapApril 2026 2025 2026 2027-2028 2029 LaunchDesign

VerificationoductionPrDelivery NRC Letter of Intent *opical & TTechnical Reports *Reactor Demonstration oval Apprfor died MMR zStandar itingS NRC Regulatory Engagement Plan *Establish Principal Design Criteria Subcomponent Manufacturing Deliver

MMRs to Early Customers Private Meeting with NRCEarly Contract RevenuesSubcomponent Testing Power Purchase Agreements, Direct NRC Public MeetingsReadiness Assessment AuditConstruction Assembly& alesS and Operating Agr,eements Early Customer

IdentificationhitepapersWanufacturing License Application *M Conceptual Design ReviewFinal Design & Prementocur Comd bineOperating License Application * QA Program Description * THE HADRON ROADMAP — A CLEAR PTH TO POWER DELIVERAY ce: (1)

IEA, Demand: Global electricity use to grSourow strongly in 2025 and 2026 ce: (2) Clean EnerSourgy Wire, Journalism for the Energy Transition 17

Scalability Scalability & Efficiency . Compact Power Massive

Impact. es overbuild, storage, equirIntermittent generation r e e to ensurand extensive transmission infrastructur eactors deliver ore micrs 10 MWon’. Hadreliabilityr ectly at the point of demand, always-on power dir eliminating dependency on

grid expansion. Compact, co-located with data centers, and esent the most space- eprfactory-deployed, they r e-efficient path to firm, and infrastructur . Distributed deployment of decarbonized power thousands of units enables materially lower total

educing transmission, distribution, system cost by r and system integration overhead. esentationApril 2026 Investor Pr 18

Competitive AdvantageApril 2026 (2) ater Design10MW Light W s

on’Hadr Competitive Lower Anticipated (1) ~$80M 00M00M Unit Cost Advantage Compact fective land usage than other e efMor es- acres< acr e)ces (<1 acrenewable energy sourr Footprint ried-and-true T void costly development and testing A

eliable sodiunrovennpr ed to non lightwater designscompar eactorscooled resigns components edits or ent or potential tax cr(1) Does not include curr any other government grant or subsidy Publicly available ince:S(2) ourormationf void expense and

delays during Ancertain olled Quality Contrikely to face ed to larger construction compardeploymen delays Manufacturing eactor deploymentsrtimelein Nth-of-a-kind manufacturing and egimes oduces novel licensing rntr Deployable, fering distributed

deployment modelofandrisk factors that may delay Reliable Power power generationlicensing esentationApril 2026 Investor Pr 19

eamTApril 2026 All Star Engineering Team. Deep Regulatory ound.Backgr

om leading rFregulatory bodies like the NRC to pioneering opulsion systems at NASA, our all-star team brings frprontier engineering expertise, institutional excellence & path to partnerships that can redefine the nuclear ecosystem. In the months

ahead, Hadron will expand its team across digital eactor systems, advanced manufacturing, and safety arre chitectur — bringing together world-class engineers, modelers, and builders to accelerate prototype development and carry our reactor

from simulation to r. eality I Y N DR UST April 2026 Investor Presentation 20

eamTApril 2026 uilt ’Bve eW eam ThaThe Tt Deliver Can e of The

Futur Samuel GibsoneRoss RidenourKen Canavand, PhDarew WAndrRahul Shukla Founder & CEOChief Nuclear OfficerChief Operating Officerechnology OfficerChief TChief Financial Officer Energy eneur and 2 time eprSerial Entree Time CNO at Parsons,

Threviously held executive Prch eviously Assistant ResearPreviously Chief Accounting Pr ASME Global Engineering Leader Southern California Edison, & leadership positions at EPRI & Scientist at the University of fiOfcer at Stem, Inc. Omaha

Public Power Districtestinghouse (CTO) WMichigan (1) Contract Positions Hand, POlivia E.. MRyan ottBusseyTimothy Vea AndreilBenoit Forget, PhD Head of Reactor Design ector of DirLicensing & OperationsP of Vusiness DevelopmentBHead of Reactor

Licensing (1), Reactor Physics (1)Advisor eviously Principal Engineering Pr eviously a Nuclear Engineer & Previously Data Center Pracility Fector of the Ofeviously DirPrfice of Head of Nuclear Science and erraPowerpositions at T Patent Attorney

with experience at Campus Manager at MetaNuclear ReactorRegulation (NRR) Engineering at MIT & NuScale the NRC esentationApril 2026 Investor Pr 21

Demonstrated ractionT prilA2026 e'veW assembled an all-star engineering

team, launched digitaltwin development,and filed 4 NUCLEAR IS SLOW patents, bothutility anddesign, alongside securing 6copyrights and trademarks. Our ougheakthrbr patent-pendingMMR ecor designanchors a ongstr IP foundation as we engage with the

OD,DOE D, and NRC. Having eadyengagedalr at the letter ofintent stage with emorthan 6 potentialcustomers, BUT WE ARE FAST onHadris scaling fast. Market Overview lciaCoermmTraction Multiple GWs Pipeline of est FrInterom Potential Customers

Significant Government DOE Projects Power Growth -term OpportunitiesNearfor Hundreds of Units Supportof 15-20% by 2035(1) 100% of Approved Reactors in ong Push for Low Carbon StrActive Discussions with the U.S. are Light Water Designsgy

SolutionsEnerLeading Hyperscalers oductPrRegylatoru & tincieSc fiEngagemsnte ear Refueling Cycle10-Year Useful Life 50-Y 10 MW of Electrical Power35 MW of Thermal Power April 2026 Investor Presentation 22

Competitive AdvantageApril 2026 Tsranaction lightigHhsceSour s &

sesU($ illionM s) Illustrative SOURCES Implied pre-money equity value of $600M aluationV ransaction T on EnerHadrgy Rollover Equity (4) $600.0 Transaction implies ~$796M pro-forma enterprise value Cash in Trust (2) $213.5 Overview with otal

sourTces$813.5 Assumes ~$213.5M at $10.67533 per share Financing 100% Trust om Cash in Tfrrust Expected uses include OPEX & MMR SOURCES RetentionDevelopment $600.0 onHadr gyEnerRollover Equity4() $1999 . Cash in rustToceedsPr (1) on Energy

sharHadreholders would roll 100% Deal $13.6 ransactionTExpenses of their equity and are expected to have a pro- eStructur forma equity ownership of 64.3% $813.5 otal Tcessour uorS :ce(1) 7i GgCapitalash-cin-st pltrus uon rdHacash Transaction

Hhligigthso ForrPa mOwshpiner less illustrative epenses. x Ass2()umes 0% of s7apitalgCiGdolheers eharerxcise deption riemrts to rgheeive casch omrf trst auont at ccu PF Shares Outstanding (Millions) 93.3 es harS% losincg. illion(Ms)Owshnerpi e Price

($) (3)Shar$10.67533 )(3B on rdaseemdeption price as o April f 2026 as 1, stated in the istration eRgStatemt en (4) on raHdEnergy ollover REqu ityValue based on a PF Equity Ve alu99$.0 6 ondrHa 6064%.3 $100 per s.0e arh () P- FN etCah s(1) ($1999).

pSac Sonpsor 13.314%.3 bPlic Suolsderehhar20 21.4% PF nterEripe Vsalue$79.16 April 2026 Investor Presentation 23

Entry PointApril 2026 Primary e Comparables Cor ARGETTMMR / SMR

TECHNOLOGY $25,562 ? $9,852 Median Market Cap: $2,662 9.2x 1.5x $3,305 10.3x ? $2,337 $2,276 8.1x $1,196 $957 $857 $600 $148 $395 ciale-CommerProvedNRC Apprciale-CommerPrciale-CommerPrciale-CommerPrciale-CommerPrciale-CommerPr Stage WR (Gen III+)LWR

(Gen III+)LHTGR (Gen IV)LM-MFFR (Gen IV)HTGR (Gen IV)GCR (Gen IV)IMSR (Gen IV) T ype Reactor Y POINTTTRACTIVE ENTRA ce: FactSet Data as of 4/13/2026 Sour eementollover equity per business combination agre-money r(1) Based on pr (2) Does not include

any private placement or public warrants 24

Building the future grid — clean, compact, unstoppable. 25 Thank

you

EX-99.3

EX-99.3

Filename: d144257dex993.htm · Sequence: 6

EX-99.3

Exhibit 99.3

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A/A

Proxy

Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

Filed by the Registrant ☒

Filed by a Party other

than the Registrant ☐

Check the appropriate box:

☐

Preliminary Proxy Statement

☐

Confidential, for Use of the Commission Only (as permitted by Rule

14a-6(e)(2))

☐

Definitive Proxy Statement

☒

Definitive Additional Materials

☐

Soliciting Material under §240.14a-12

GigCapital7 Corp.

(Name

of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

☒

No fee required.

☐

Fee paid previously with preliminary materials.

☐

Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a6(i)(1) and 0-11

SUPPLEMENT TO PROXY STATEMENT

OF

GigCapital7, Corp.

Dated April 20, 2026

The

following disclosures in this proxy supplement (the “Supplement”) supplement, and should be read in conjunction with, the disclosures contained in the joint definitive proxy statement/final prospectus (the

“Proxy Statement”), filed on April 15, 2026, which in turn should be read in its entirety. To the extent the information set forth herein differs from or updates information contained in the Proxy Statement, the

information set forth herein shall supersede or supplement the information in the Proxy Statement. All other information in the Proxy Statement remains unchanged.

As provided in the Proxy Statement, GigCapital7 Corp., a Cayman Islands exempted company (“GigCapital7”) is soliciting

stockholder approval of, among other things, its proposed business combination (the “Business Combination”) with Hadron Energy, Inc., a Delaware corporation (the “Company”) and the

other matters as described in the Proxy Statement, which includes a prospectus relating to the offer of the securities to be issued to the stockholders of the Company in connection with the Business Combination. The purpose of the following

supplemental disclosures is to provide additional information about the Second Amendment (as defined below) and the Amended and Restated Working Capital Note (as defined below). Terms used herein, unless otherwise defined, have the meanings set

forth in the Proxy Statement.

DESCRIPTION OF

SECOND AMENDMENT TO BUSINESS COMBINATION AGREEMENT

AND

AMENDED AND RESTATED

PROMISSORY NOTE

As previously disclosed in a Current Report on Form 8-K that GigCapital7 filed with the U.S.

Securities and Exchange Commission (the “SEC”) on September 29, 2025, GigCapital7 entered into a Business Combination Agreement (as amended, the “Business Combination Agreement”), dated as of

September 27, 2025, by and among GigCapital7, MMR Merger Sub, Inc., a Delaware corporation and a direct wholly owned subsidiary of GigCapital7 (“Merger Sub”) and the Company, pursuant to which, among other things and subject

to the terms and conditions therein, Merger Sub will merge with and into the Company (the “Merger”), with the Company surviving as a wholly-owned subsidiary of GigCapital7. The Business Combination Agreement was subsequently

amended by the First Amendment to Business Combination Agreement, dated as of December 12, 2025, by and among GigCapital7, Merger Sub, and the Company (the “First Amendment”).

On April 16, 2026, GigCapital7, Merger Sub, and the Company entered into a Second Amendment to Business Combination Agreement (the “Second

Amendment”), which amends the Business Combination Agreement to (a) adjust the valuation of the Company and (b) extend the Outside Date. The Second Amendment amends the definition of “Public Company (Pre-Capital Raise) Valuation” set forth in Article X of the Business Combination Agreement to mean $776,599,997, which has the effect of reducing the Aggregate Merger Consideration to be issued for the

securities of the Company to 60,000,000 shares of Domesticated Purchaser Common Stock, which at a nominal value of $10.00 per share would have a valuation for the Company of $600 million. The Second Amendment also amends Section 8.01(c) of

the Business Combination Agreement to replace the date “April 30, 2026” with the date “May 31, 2026.” As a result, all references to the “Outside Date” in the Business Combination Agreement now refer to

May 31, 2026. Other than as modified by the Second Amendment, all terms, conditions, and provisions of the Business Combination Agreement, as previously amended, remain in full force and effect.

On April 16, 2026, GigCapital7 issued an amended and restated unsecured convertible promissory note (the “Amended and Restated Working Capital

Note”) in the principal amount of $293,000.00 to GigAcquisitions7 Corp., a Cayman Islands exempted company (the “Sponsor”). The Amended and Restated Working Capital Note amends, restates, supersedes and replaces that

certain unsecured convertible promissory note dated January 30, 2026, in the principal amount of $148,000 previously issued by GigCapital7 to the Sponsor (the “Prior Note”). GigCapital7 issued the Amended and Restated Working

Capital Note in consideration for a loan from the Sponsor to fund GigCapital7’s working capital requirements. The Amended and Restated Working Capital Note is convertible at the Sponsor’s election upon the consummation of the initial

business combination. Upon such election, the convertible note will convert, at a price of $10.00 per unit, into units identical to the private placement units issued in connection with GigCapital7’s initial public offering. The Amended and

Restated Working Capital Note bears no interest and is repayable in full upon the consummation of a business combination by GigCapital7, except that the Amended and Restated Working Capital Note may be converted, at the sole election of the Sponsor,

into units of GigCapital7 at the consummation of GigCapital7’s initial business combination.

There is no change to the date, location, the record

date, redemption deadline or any of the other proposals to be acted upon at the Extraordinary General Meeting. Shareholders who have previously submitted their proxies or otherwise voted and who do not want to change their vote need not take any

action. Shareholders as of the record date of April 15, 2026 can vote, even if they have subsequently sold their shares. Shareholders who wish to withdraw their previously submitted redemption requests may do so prior to the Extraordinary

General Meeting by requesting that the transfer agent return such shares prior to the Extraordinary General Meeting.

IMPORTANT NOTICES

About GigCapital7

GigCapital7 is a blank check company,

also commonly referred to as a special purpose acquisition company, or SPAC, formed for the purpose of entering into a merger, capital stock exchange, asset acquisition, stock purchase reorganization or similar business combination with one or more

businesses or entities. While GigCapital7’s efforts to identify a target business may span many industries, the focus of GigCapital7’s search is for prospects within the technology, media, and telecommunications, artificial intelligence

and machine learning, cybersecurity, medical technology and medical equipment, semiconductor and sustainable industries. GigCapital7 was sponsored by GigAcquisitions7, LLC, which was founded by GigFounders, LLC, each a member entity of GigCapital

Global, and formed for the purpose of entering into a merger, share exchange, asset acquisition, stock purchase, recapitalization, reorganization, or similar business combination with one or more businesses.

On September 27, 2025, GigCapital7 entered into the Business Combination Agreement with Merger Sub and the Company, pursuant to the terms of which,

Merger Sub will merge with and into the Company, with the Company surviving as a wholly-owned subsidiary of GigCapital7, which will be renamed as Hadron Energy, Inc.

Additional Information and Where to Find It

In

connection with the proposed Business Combination between GigCapital7 and the Company, GigCapital7 has filed the Proxy Statement, which includes a prospectus, with the SEC, and has commenced distribution of the Proxy Statement to GigCapital7’s

shareholders in connection with GigCapital7’s solicitation of proxies for the shareholder vote in connection with the Business Combination and related transactions, and the other matters described in the Proxy Statement. GigCapital7 is mailing

the Proxy Statement and other relevant documents to its shareholders as of April 15, 2026, the record date established for voting on the proposed Business Combination.

BEFORE MAKING ANY VOTING OR INVESTMENT DECISION, GIGCAPITAL7’S SHAREHOLDERS AND OTHER INTERESTED PARTIES ARE URGED TO READ, WHEN AVAILABLE, THE

DEFINITIVE PROXY STATEMENT/FINAL PROSPECTUS AND ALL OTHER RELEVANT DOCUMENTS FILED OR THAT WILL BE FILED WITH THE SEC IN CONNECTION WITH GIGCAPITAL7’S SOLICITATION OF PROXIES FOR THE EXTRAORDINARY GENERAL MEETING OF ITS SHAREHOLDERS TO BE HELD

TO APPROVE THE BUSINESS COMBINATION AGREEMENT, THE BUSINESS COMBINATION AND OTHER MATTERS AS DESCRIBED IN THE DEFINITIVE PROXY STATEMENT/FINAL PROSPECTUS BECAUSE THESE DOCUMENTS WILL CONTAIN IMPORTANT INFORMATION ABOUT GIGCAPITAL7, THE COMPANY AND

THE PROPOSED TRANSACTIONS. Shareholders and other interested parties may obtain a copy of these documents, without charge, at the SEC’s website located at www.sec.gov or by directing a written request to GigCapital7 Corp., Attn:

Corporate Secretary, 1731 Embarcadero Rd., Suite 200, Palo Alto, CA 94303.

NEITHER THE SEC NOR ANY STATE SECURITIES REGULATORY AGENCY HAS APPROVED OR

DISAPPROVED THE TRANSACTIONS DESCRIBED HEREIN, PASSED UPON THE MERITS OR FAIRNESS OF THE TRANSACTIONS OR ANY RELATED TRANSACTIONS OR PASSED UPON THE ADEQUACY OR ACCURACY OF THE DISCLOSURE IN THIS CURRENT REPORT. ANY REPRESENTATION TO THE CONTRARY

CONSTITUTES A CRIMINAL OFFENSE.

Participants in the Solicitation

The Company, GigCapital7 and their respective directors, executive officers, management and employees, under SEC rules, may be deemed to be participants in a

solicitation of proxies of GigCapital7’s shareholders in connection with the Business Combination and related transactions. Investors and shareholders may obtain more detailed information regarding the names, affiliations, and interests of

GigCapital7’s directors and executive officers in its filings with the SEC, including GigCapital7’s Annual Report on Form 10-K for the fiscal year ended December 31, 2025, filed with the SEC

on March 6, 2026. Information regarding the persons who may, under SEC rules, be deemed participants in the solicitation of proxies of GigCapital7’s shareholders in connection with the Business Combination is set forth in the Proxy

Statement, along with information concerning the interests of the Company’s and GigCapital7’s participants in the solicitation. Such interests may in some cases be different from those of the Company’s or GigCapital7’s equity

holders generally. Investors and security holders may obtain free copies of these documents as described above.

Forward-Looking Statements:

Certain statements included in this Current Report on Form 8-K and the exhibit hereto that are not historical

facts are forward-looking statements for purposes of the “safe harbor” provisions under the United States Private Securities Litigation Reform Act of 1995. Forward-looking statements generally are

accompanied by words such as “may,” “could,” “would,” “should,” “expect,” “possible,” “potential,” “goal,” “opportunity,”

“project,” “believe,” “future”, “designed,” “forecast,” “target,” “will,” “anticipate,” “estimate,” “continue,”

“intend,” “plan,” “predict,” “seem,” “seek,” “outlook,” and, in each case, similar words and expressions, or their negative variations, and terminology that predict or indicate

future events or trends or that are not statements of historical matters. Forward-looking statements generally relate to future events, including, without limitation, statements, estimates, forecasts or

projections regarding the Company’s future manufacturing capacity and plant performance; market opportunity and market share; estimates and projections of adjacent energy sector opportunities; the Company’s projected commercialization

costs and timeline; the Company’s ability to demonstrate scientific and engineering feasibility of its technologies; the Company’s ability to attract, retain and expand its future customer base; the Company’s ability to timely and

effectively meet construction and development timelines and scale its production and manufacturing processes; the Company’s ability to develop products and services and bring them to market in a timely manner; the Company’s ability to

compete successfully with energy products and solutions offered by other companies; the Company’s expectations concerning relationships with strategic partners, suppliers, governments, regulatory bodies and other third parties; the

Company’s ability to maintain, protect, and enhance its intellectual property; future ventures or investments in companies or products, services, or technologies; the Company’s expectations regarding regulatory framework development; the

potential for and timing of receipt of licenses and permits for current and future operations, including licenses to operate nuclear facilities from the U.S. Nuclear Regulatory Commission; the success of proposed projects for which the

Company’s products would provide power, which is outside of the Company’s control; the safety profile of the Company’s technology; the execution and success of any definitive agreements related to partnerships and collaborations

between the Company and third parties; the Company’s expectations with respect to future performance; GigCapital7’s and the Company’s respective industries, future events, the anticipated use of the investor presentation by the

Company and GigCapital7, potential financing activities by the Company, including any contemplated private placement of SAFEs, potential non-deal roadshows, and possible PIPE financing discussions, the

proposed transactions between GigCapital7 and the Company, the anticipated timing and benefits of the Business Combination, the entry into agreements related to the Business Combination, the consummation of the proposed Business Combination; the

estimated or anticipated future results and benefits of the combined company following the proposed transactions, including the likelihood and ability of the parties to successfully consummate the proposed transactions, future opportunities for the

combined company, GigCapital7’s or the Company’s future financial or operating performance, and other statements that are not historical facts. In addition, these forward-looking statements include, without limitation, statements

regarding GigCapital7’s and the Company’s expectations with respect to future performance and anticipated financial impacts of the proposed private placements, the Business Combination and other transactions, the satisfaction of the

closing conditions to the Business Combination and other transactions, and the timing of the completion of the Business Combination and other transactions. Such forward-looking statements are subject to risks, uncertainties (some of which are beyond

the control of the Company and/or GigCapital7), and other factors which could cause actual results to differ materially from those expressed or implied by such forward-looking statements. These forward-looking statements are based upon estimates and

assumptions that, while considered reasonable by GigCapital7 and its management, and the Company and its management, as the case may be, are inherently uncertain. Factors that may cause actual results to differ materially from current expectations

include, without limitation: (1) the occurrence of any event, change or other circumstances that could give rise to the termination of the proposed Business Combination or other definitive agreements in connection thereto; (2) the outcome

of any legal proceedings that may be instituted against the Company, GigCapital7 or others following the announcement of the proposed Business Combination and any definitive agreements with respect thereto; (3) the inability to successfully or

timely consummate the Business Combination and related transactions, including due to the failure to obtain consents and approvals of the shareholders of GigCapital7; (4) the failure to obtain financing to complete the transactions or to satisfy

other conditions to closing; delays or failures to obtain necessary regulatory approvals required to complete the transactions; (5) changes to the proposed structure of the transactions as a result of applicable laws, regulations or conditions;

(6) the ability of GigCapital7 to meet applicable listing standards following the consummation of the Business Combination; (7) the risk that the Business Combination disrupts current plans and operations of the Company as a result of the

announcement and consummation of the Business Combination; (8) projections, estimates and forecasts of revenue and other financial and performance metrics;

(9) projections about industry trends and market opportunity; expectations relating to the demand for the Company’s micro modular reactor (“MMR”) technology;

(10) the Company’s ability to scale and grow its business; (11) the cash position of the Company following closing of the Business Combination; (12) the risk that the transactions disrupt current plans and operations of the

Company as a result of the announcement and consummation of the transactions; (13) the ability to recognize the anticipated benefits of the Business Combination, which may be affected by, among other things, competition, the ability of the

Company to successfully commercialize its MMR, and the Company’s ability to source and maintain key relationships with management and key employees; (14) the ability of the combined company to grow and manage growth profitably, continue

developing its properties, maintain relationships with customers and suppliers, and retain its management and key employees; (15) costs related to the transactions; (16) risks relating to significant legal, commercial, regulatory and

technical uncertainty regarding the classification and management of nuclear energy resources, including evolving environmental standards, permitting requirements, and potential changes in applicable laws or regulations; changes in applicable laws

and regulations; political and economic developments and market volatility; (17) the possibility that the Company and/or its related entities may be adversely affected by other economic, business, and/or competitive factors; (18) risks

relating to the Company’s anticipated operations and business, including its focus on the development and commercialization of MMR technologies; (19) the risk that the Company does not ever enter into any definitive agreements in

connection with commercialization of its technology; (20) the risk that the Company is pursuing an emerging market; (21) the amount of redemption requests made by the GigCapital7 public shareholders; (22) risks related to the future

performance of the Company; (23) the potential need for financing for future operations; (24) financial, political and legal conditions; (25) increased competition in the energy industry; (26) limited supply of materials and

supply chain disruptions; and (27) other risks and uncertainties set forth under “Risk Factors” and other documents filed, or to be filed, with the SEC by GigCapital7 and/or the Company, including the Registration Statement on Form S-4 that the Company and GigCapital7 filed in connection with the Business Combination, and GigCapital7’s other filings with the SEC, as well as any further risks and uncertainties contained in the Proxy

Statement. In addition, there may be additional risks that neither GigCapital7 or the Company presently know, or that GigCapital7 or the Company currently believe are immaterial, that could also cause actual results to differ from those contained in

the forward-looking statements. Nothing in this Current Report should be regarded as a representation by any person that the forward-looking statements set forth herein will be achieved or that any of the contemplated results of such forward-looking

statements will be achieved. You should not place undue reliance on forward-looking statements, which speak only as of the date they are made. Except as may be required by law, neither GigCapital7 nor the Company undertakes any duty to update these

forward-looking statements. The inclusion of any statement in this communication does not constitute an admission by GigCapital7, the Company, or any other person that the events or circumstances described in such statement are material.

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