Sec Form 4 Filing - Terrani Kurt Amir @ Standard Nuclear, Inc. - 2026-07-20

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 Terrani Kurt Amir 2. Issuer Name and Ticker or Trading Symbol Standard Nuclear, Inc. [ STDN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) CEO and Director (Last) (First) (Middle) C/O STANDARD NUCLEAR, INC., 200 EUROPIA AVE 3. Date of Earliest Transaction (MM/DD/YY) 07/20/2026 (Street) OAK RIDGE, TN37830 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ 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 Class A common stock 07/20/2026 G( 1 ) 629,374 ( 1 ) D $ 0 6,641,876 D Class A common stock 07/20/2026 G( 1 ) 629,374 ( 1 ) A $ 0 629,374 ( 2 ) I Held by Terrani 2026 Irrevocable Family Trust, dated June 24, 2026 ( 2 ) Class A common stock 07/20/2026 G( 1 ) 175,000 ( 1 ) D $ 0 6,466,876 D Class A common stock 07/20/2026 G( 1 ) 175,000 ( 1 ) A $ 0 175,000 ( 3 ) I Held by DSC 2026 Irrevocable Trust, dated June 24, 2026 ( 3 ) Class A common stock 07/20/2026 G( 1 ) 60,000 ( 1 ) D $ 0 6,406,876 D Class A common stock 07/20/2026 G( 1 ) 60,000 ( 1 ) A $ 0 60,000 ( 4 ) I Held by MT 2026 Irrevocable Trust, dated July 10, 2026 ( 4 ) Class A common stock 07/20/2026 G( 1 ) 245,000 ( 1 ) D $ 0 6,161,876 D Class A common stock 07/20/2026 G( 1 ) 245,000 ( 1 ) A $ 0 245,000 ( 5 ) I Held by EKG 2026 Irrevocable Trust, dated June 25, 2026 ( 5 ) Class A common stock 07/20/2026 G( 1 ) 175,000 ( 1 ) D $ 0 5,986,876 D Class A common stock 07/20/2026 G( 1 ) 175,000 ( 1 ) A $ 0 175,000 ( 6 ) I Held by LKT 2026 Irrevocable Trust, dated June 25, 2026 ( 6 )

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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Terrani Kurt Amir C/O STANDARD NUCLEAR, INC. 200 EUROPIA AVE OAK RIDGE, TN37830 X CEO and Director Signatures /s/ Shahram Ghasemian, by power of attorney 07/22/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Represents a bona fide gift by the Reporting Person, for no consideration, to a trust established for the benefit of members of the Reporting Person's immediate family, as further described in the footnotes below. The Reporting Person is subject to a lock-up agreement that was entered into with the representatives of the underwriters in connection with the Issuer's initial public offering of its Class A Common Stock (the "IPO"). The shares were transferred by the Reporting Person to the trust as a bona fide gift not involving a disposition for value, which is a permissible exception under the terms of the lock-up agreement. In connection with the gift, the trustee of the trust has executed and delivered to the representatives of the underwriters a lock-up agreement in the form entered into by the Reporting Person in connection with the IPO, and the shares held by the trust remain subject to the restrictions on transfer set forth therein for the balance of the applicable lock-up period ( 2 )These shares are held by the Terrani 2026 Irrevocable Family Trust, dated June 24, 2026, a trust for the benefit of members of the Reporting Person's immediate family, of which Denise Sarah Castley serves as the trustee. By virtue of his relationship with the beneficiaries of the trust, the Reporting Person is deemed to have an indirect beneficial interest in the shares held by the trust. The Reporting Person disclaims beneficial ownership of the shares held by the trust. ( 3 )These shares are held by the DSC 2026 Irrevocable Trust, dated June 24, 2026, a trust for the benefit of members of the Reporting Person's immediate family, of which Denise Sarah Castley serves as the trustee. By virtue of his relationship with the beneficiaries of the trust, the Reporting Person is deemed to have an indirect beneficial interest in the shares held by the trust. The Reporting Person disclaims beneficial ownership of the shares held by the trust. ( 4 )These shares are held by the MT 2026 Irrevocable Trust, dated July 10, 2026, a trust for the benefit of members of the Reporting Person's immediate family, of which Merran Terrani serves as the trustee. By virtue of his relationship with the beneficiaries of the trust, the Reporting Person is deemed to have an indirect beneficial interest in the shares held by the trust. The Reporting Person disclaims beneficial ownership of the shares held by the trust. ( 5 )These shares are held by the EKG 2026 Irrevocable Trust, dated June 25, 2026, a trust for the benefit of members of the Reporting Person's immediate family, of which Leila Karim Tehrani serves as the trustee. By virtue of his relationship with the beneficiaries of the trust, the Reporting Person is deemed to have an indirect beneficial interest in the shares held by the trust. The Reporting Person disclaims beneficial ownership of the shares held by the trust. ( 6 )These shares are held by the LKT 2026 Irrevocable Trust, dated June 25, 2026, a trust for the benefit of members of the Reporting Person's immediate family, of which Leila Karim Tehrani serves as the trustee. By virtue of his relationship with the beneficiaries of the trust, the Reporting Person is deemed to have an indirect beneficial interest in the shares held by the trust. The Reporting Person disclaims beneficial ownership of the shares held by the trust

Remarks: The Reporting Person serves as Chief Executive Officer, President and Director of the Issuer.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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