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): October 14, 2025

SPRING VALLEY ACQUISITION CORP. II

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (214) 308-5230

Not Applicable

(Former name or former address, if changed since last report)

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:

¨    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:

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 x

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. ¨

On October 14, 2025, Spring Valley Acquisition Corp. II (the “Company”) received a written notice (the “Notice”) from the Nasdaq Listing Qualifications Department of The Nasdaq Stock Market (“Nasdaq”) that the Company's securities will be delisted from The Nasdaq Stock Market by reason of the failure of the Company to complete its initial business combination by October 12, 2025 (36 months from the effectiveness of its IPO registration statement) as required by IM-5101-2. Accordingly, trading in the Company's Class A Ordinary Shares, Warrants, Rights and Units will be suspended at the opening of business on October 21, 2025 and a Form 25-NSE will be filed by Nasdaq with the Securities and Exchange Commission, which will remove the Company’s securities from listing and registration on the Nasdaq Stock Market.

Notwithstanding the delisting of the Company's securities from Nasdaq, it remains the intention of the Company to continue to pursue an initial business combination as well as the listing of the post-combination company’s securities on Nasdaq in connection therewith. However, there can be no assurance that an initial business combination will ultimately be successful or that the post-combination company's securities will ultimately be listed on Nasdaq in connection therewith. The Company will remain a reporting entity under the Securities Exchange Act of 1934, as amended, with respect to continued disclosure of financial and operational information.

On October 15, 2025, the Company held an extraordinary general meeting of shareholders of the Company (the “Meeting”) to vote on a proposal (the “Extension Amendment Proposal”) to amend, by way of special resolution, the Company’s amended and restated memorandum and articles of association, as previously amended by the Second Amendment to the Amended and Restated Articles, dated November 14, 2024 (the “Articles”, as amended, the “Amended Articles”), to amend the date by which the Company has to consummate a business combination to 45 months from the closing of the initial public offering, or such earlier date as is determined by the Company’s board of directors, in its sole discretion, to be in the best interests of the Company (the “Amendment”), provided that Spring Valley Acquisition Sponsor II, LLC (the “Sponsor”) (or its affiliates or permitted designees) will deposit into the trust account established for the benefit of the Company’s public shareholders (the “Trust Account”) an amount determined by multiplying $0.01 by the number of public shares then outstanding for each one-month extension, up to a total of six months, starting on the 40th month from the closing of the Company’s initial public offering, unless the closing of the Company’s initial business combination shall have occurred, in exchange for a non-interest bearing, unsecured promissory note payable upon consummation of a business combination. The Extension Amendment Proposal is described in more detail in the Company’s definitive proxy statement filed with the U.S. Securities and Exchange Commission (the “SEC”) on September 30, 2025 (the “Proxy Statement”), as supplemented by the supplement to the Proxy Statement filed with the SEC on October 8, 2025.

In addition, on October 15, 2025, the Company filed an amendment to the Articles with the Registrar of Companies of the Cayman Islands reflecting the shareholder-approved amendment. A copy of the amendment to the Articles is attached hereto as Exhibit 3.1.

The information disclosed in Item 5.07 of this Current Report with respect to the Amendment is incorporated by reference into this Item 5.03 to the extent required and the foregoing description of the Amended Articles is qualified in its entirety by reference to the amendment to the Company’s Articles, a copy of which is attached as Exhibit 3.1 hereto and is incorporated by reference herein.

At the Meeting, holders of 8,769,572 ordinary shares (consisting of 8,769,571 Class A ordinary shares, par value $0.0001 (the “Class A ordinary shares”) and one Class B ordinary share) were present in person, virtually over the internet or by proxy, representing approximately 88.76% of the voting power of the Company’s ordinary shares as of September 19, 2025, the record date for the Meeting, and constituting a quorum for the transaction of business.

With a quorum present, the applicable shareholders approved the Extension Amendment Proposal. The voting results for the Extension Amendment Proposal were as follows:

Proposal No. 1 – The Extension Amendment Proposal

As there were sufficient votes to approve the Extension Amendment Proposal, the “Adjournment Proposal” as described in the Proxy Statement was not presented to shareholders.

The information disclosed under 5.03 and Item 5.07 of this Current Report is incorporated by reference into this Item 8.01.

Redemptions

In connection with the vote to approve the Extension Amendment Proposal, holders of 151 Class A ordinary shares exercised their right to redeem their Class A ordinary shares for cash at a redemption price of approximately $11.93 per share, for an aggregate redemption amount of approximately $1,801.43. As a result, approximately $26,404,398.04 remains in the Trust Account and 2,213,278 Class A ordinary shares remain outstanding.

Cautionary Note Regarding Forward-Looking Statements

This Current Report contains statements that are forward-looking and as such are not historical facts. This includes, without limitation, statements regarding the Company’s financial position, business strategy and the plans and objectives of management for future operations. These statements constitute projections, forecasts and forward-looking statements, and are not guarantees of performance. They involve known and unknown risks, uncertainties, assumptions and other factors that may cause the actual results, performance or achievements of the Company to be materially different from any future results, performance or achievements expressed or implied by these statements. Such statements can be identified by the fact that they do not relate strictly to historical or current facts. When used in this Current Report, words such as “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “might,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “strive,” “would” and similar expressions may identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking. These forward-looking statements involve a number of risks, uncertainties (some of which are beyond our control) or other assumptions that may cause actual results or performance to be materially different from those expressed or implied by these forward-looking statements. When the Company discusses its strategies or plans, it is making projections, forecasts or forward-looking statements. Such statements are based on the beliefs of, as well as assumptions made by and information currently available to, the Company’s management. Actual results and shareholders’ value will be affected by a variety of risks and factors, including, without limitation, international, national and local economic conditions, merger, acquisition and business combination risks, financing risks, geo-political risks, acts of terror or war, and those risk factors described under “Item 1A. Risk Factors” of the Company’s Annual Report on Form 10-K filed with the SEC on April 11, 2025, in the Proxy Statement filed in connection with the Meeting and Amendment on September 30, 2025, as supplemented, and in other reports the Company files with the SEC. Many of the risks and factors that will determine these results and shareholders’ value are beyond the Company’s ability to control or predict.

All such forward-looking statements speak only as of the date of this Current Report. The Company expressly disclaims any obligation or undertaking to release publicly any updates or revisions to any forward-looking statements contained herein to reflect any change in the Company’s expectations with regard thereto or any change in events, conditions or circumstances on which any such statement is based. All subsequent written or oral forward-looking statements attributable to us or persons acting on the Company’s behalf are qualified in their entirety by this “Cautionary Note Regarding Forward-Looking Statements” section.

(d) Exhibits

SIGNATURE

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