Sec Form 3 Filing - Fundomo SN-001, LP @ Standard Nuclear, Inc. - 2026-07-15

FORM 3 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 Fundomo SN-001, LP 2. Issuer Name and Ticker or Trading Symbol Standard Nuclear, Inc. [ STDN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 401 PARK AVE. S., 10TH FLOOR 3. Date of Earliest Transaction (MM/DD/YY) 07/15/2026 (Street) NEW YORK, NY10010 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

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 Series A Preferred Stock ( 1 ) ( 1 ) ( 1 ) Class A Common Stock 3,849,782 D ( 2 ) ( 3 ) ( 4 ) Series A-2 Preferred Stock ( 1 ) ( 1 ) ( 1 ) Class A Common Stock 2,027,576 I By Fundomo SN-002, LP ( 2 ) ( 3 ) ( 4 ) Series Seed-1 Preferred Stock ( 1 ) ( 1 ) ( 1 ) Class A Common Stock 14,000,000 I By ST-1014 Fund I, a series of Fundomo Syndicates, LP ( 2 ) ( 3 ) ( 4 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Fundomo SN-001, LP 401 PARK AVE. S. 10TH FLOOR NEW YORK, NY10010 X Fundomo SN-002, LP 401 PARK AVE. S. 10TH FLOOR NEW YORK, NY10016 X Fundomo SN-001 GP, LLC 401 PARK AVENUE SOUTH, 10TH FLOOR NEW YORK, NY10016 X Fundomo SN-002 GP, LLC 401 PARK AVENUE SOUTH, 10TH FLOOR NEW YORK, NY10016 X Nobile Corey L. 401 PARK AVENUE SOUTH, 10TH FLOOR NEW YORK, NY10016 X Signatures Fundomo SN-001, LP. By: Fundomo SN-001 GP, LLC, its general partner, By: /s/ Corey L. Nobile, Sole Member 07/30/2026 Signature of Reporting Person Date Fundomo SN-002, LP. By: Fundomo SN-002 GP, LLC, its general partner, By: /s/ Corey L. Nobile, Sole Member 07/30/2026 Signature of Reporting Person Date Fundomo SN-001 GP, LLC. By: /s/ Corey L. Nobile, Sole Member 07/30/2026 Signature of Reporting Person Date Fundomo SN-002 GP, LLC. By: /s/ Corey L. Nobile, Sole Member 07/30/2026 Signature of Reporting Person Date /s/ Corey L. Nobile 07/30/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )In connection with the completion of the Issuer's initial public offering of its Class A Common Stock, each share of Series Seed-1 Preferred Stock, Series A Preferred Stock, and Series A-2 Preferred Stock will automatically convert into shares of Class A Common Stock of the Issuer at a ratio of 1-for-1. The securities have no expiration date. ( 2 )Fundomo SN-001 GP, LLC ("SN-001 GP") is the sole general partner of Fundomo SN-001, LP ("SN-001"). Fundomo SN-002 GP, LLC ("SN-002 GP") is the sole general partner of Fundomo SN-002, LP ("SN-002"). Corey L. Nobile is the sole member of SN-001 GP and SN-002 GP. Each of SN-001 GP, SN-002 GP, and Corey L. Nobile may be deemed to share voting and dispositive power with respect to the shares held directly by SN-001 (in the case of SN-001 GP) and SN-002 (in the case of SN-002 GP), respectively. ( 3 )ST-1014 Fund I, a series of Fundomo Syndicates, LP ("ST-1014 Fund I") may be considered an affiliate of SN-001, SN-002, SN-001 GP and SN-002 GP, but voting and dispositive power over the shares held directly by ST-1014 Fund I has been delegated on an irrevocable basis to an unaffiliated third-party investment adviser pursuant to the terms of ST-1014 Fund I's limited partnership agreement. As the fund lead under such limited partnership agreement, Corey L. Nobile may also be considered to have shared voting and dispositive powers over such shares. None of SN-001, SN-002, SN-001 GP, or SN-002 GP has voting or dispositive power over such shares. ( 4 )Each of the reporting persons and entities disclaims beneficial ownership of the reported securities (except to the extent of such person's or entity's pecuniary interest in such securities). The filing of this statement by the reporting persons shall not be deemed an admission that such persons are, for purposes of Section 16 of the Securities and Exchange Act of 1934 or otherwise, the beneficial owner of any equity securities covered by this statement.

Remarks: This Form 3 is being filed to include SN-001 GP, SN-002 GP, and Corey L. Nobile as Reporting Persons following the receipt of such Reporting Persons CIK codes, subsequent to the filing of the Form 3 made on July 16, 2026.

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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