Sec Form 4 Filing - Katz Avi S @ Hadron Energy, Inc. - 2026-05-22

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Katz Avi S 2. Issuer Name and Ticker or Trading Symbol Hadron Energy, Inc. [ HDRN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chairman (Last) (First) (Middle) C/O GIGACQUISITIONS7 CORP., 1731 EMBARCADERO RD, SUITE 200 3. Date of Earliest Transaction (MM/DD/YY) 05/22/2026 (Street) PALO ALTO, CA94303 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 05/22/2026 A 87,500 ( 1 ) A 87,500 D Common Stock 05/22/2026 A 87,500 ( 3 ) A 87,500 I By Spouse, Dr. Raluca Dinu Common Stock 05/22/2026 A 9,932,246 ( 4 ) A 9,932,246 I By GigAcquisitions7 Corp. ( 4 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Class B ordinary shares ( 2 ) 05/22/2026 M 9,932,246 05/22/2026 05/22/2026 Common Stock 9,932,246 ( 2 ) 0 I GigAcquisitions7 Corp. ( 4 ) Convertible Promissory Note ( 5 ) 05/22/2026 J 29,300 05/22/2026 05/22/2026 Class A ordinary shares 29,300 ( 5 ) 0 I GigAcquisitions7 Corp. ( 4 ) Convertible Promissory Note ( 5 ) 05/22/2026 J 29,300 05/22/2026 05/22/2026 Warrants 29,300 ( 5 ) 0 I GigAcquisitions7 Corp. ( 4 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Katz Avi S C/O GIGACQUISITIONS7 CORP. 1731 EMBARCADERO RD, SUITE 200 PALO ALTO, CA94303 X X Chairman GigAcquisitions7 Corp. C/O GIGACQUISITIONS7 CORP. 1731 EMBARCADERO RD, SUITE 200 PALO ALTO, CA94303 X Dinu Raluca C/O GIGACQUISITIONS7 CORP. 1731 EMBARCADERO RD, SUITE 200 PALO ALTO, CA94303 X X Signatures /s/ Dr. Avi S. Katz, individually 05/27/2026 Signature of Reporting Person Date /s/ Dr. Avi S. Katz, as managing member of GigAcquisitions7 Corp. 05/27/2026 Signature of Reporting Person Date /s/ Dr. Raluca Dinu, individually 05/27/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Received by Dr. Avi S. Katz in exchange for 1,750.04 shares of Hadron Energy, Inc. ("Hadron") held by Dr. Katz, in connection with the merger of Hadron into a subsidiary of GigCapital7 Corp. (the "Company") (the "Merger") pursuant to the exchange ratio set forth in the business combination agreement between Hadron and the Company. The acquisition of these shares is an exempt transaction under Rule 16b-3, promulgated by the U.S. Securities and Exchange pursuant to the Securities and Exchange Act of 1934, as amended. ( 2 )The closing price of the Company's Common Stock on the effective date of the Merger was $5.16. ( 3 )Received by Dr. Raluca Dinu in exchange for 1,750.04 shares of Hadron held by Dr. Dinu, in connection with the Merger of Hadron into a subsidiary of the Company pursuant to the exchange ratio set forth in the business combination agreement between Hadron and the Company. The acquisition of these shares is an exempt transaction under Rule 16b-3, promulgated by the U.S. Securities and Exchange pursuant to the Securities and Exchange Act of 1934, as amended. ( 4 )The Common Stock are held directly by GigAcquisitions7 Corp. (the "Sponsor"). The shares held by the Sponsor are beneficially owned by Dr. Katz, the Issuer's Chairman of the Board of Directors, and Dr. Dinu, the Issuer's Director. Dr. Katz and Dr. Dinu are the members of the Sponsor, who both have the voting and dispositive power over the shares held by the Sponsor. ( 5 )In connection with the closing of the Merger, the principal balance of the convertible promissory note was paid in full.

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