Sec Form 3 Filing - Spring Valley Acquisition III Sponsor, LLC @ Spring Valley Acquisition Corp. III - 2025-09-03

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 Spring Valley Acquisition III Sponsor, LLC 2. Issuer Name and Ticker or Trading Symbol Spring Valley Acquisition Corp. III [ SVAC] 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) 2100 MCKINNEY AVE., SUITE 1675 3. Date of Earliest Transaction (MM/DD/YY) 09/03/2025 (Street) DALLAS, TX75201 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

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 ( 1 ) ( 1 ) ( 1 ) Class A ordinary shares 7,546,667 ( 2 ) D ( 2 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Spring Valley Acquisition III Sponsor, LLC 2100 MCKINNEY AVE., SUITE 1675 DALLAS, TX75201 X Signatures /s/ Jason Simon, Attorney-in-Fact 09/03/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The Class B ordinary shares of Spring Valley Acquisition Corp. III (the "Issuer") have no expiration date and will automatically convert into Class A ordinary shares concurrently with or immediately following the consummation of the Issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment, as described in the Registration Statement on Form S-1 (File No. 333-289294) (the "Registration Statement") related to the Issuer's initial public offering (the "IPO"). ( 2 )Includes up to 1,000,000 shares subject to forfeiture by Spring Valley Acquisition III Sponsor, LLC (the "Sponsor") depending on the extent to which the IPO underwriters' over-allotment option is exercised, as described in the Registration Statement. Christopher Sorrells, the Chairman and Chief Executive Officer of the Issuer, is the managing member of the Sponsor and may be deemed to have beneficial ownership of the securities held directly by the Sponsor. Mr. Sorrells disclaims any beneficial ownership of the securities held by our sponsor other than to the extent of his pecuniary interest therein.

Remarks: See Exhibit 24.1 - Power of Attorney (Spring Valley Acquisition III Sponsor, LLC);

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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