Plum Acquisition IV (NASDAQ: PLMK) refreshes merger pitch ahead planned vote

Rhea-AI Filing Summary

Plum Acquisition Corp. IV (PLMK), a special purpose acquisition company, furnished an updated investor presentation related to its previously announced Business Combination Agreement with Controlled Thermal Resources Holdings Inc. The presentation, dated August 19, 2026, is provided under Regulation FD and replaces an earlier March 9, 2026 investor deck.

The company plans to file a Registration Statement on Form S-4 that will include a proxy statement/prospectus for Plum IV shareholders to vote on the proposed business combination and related matters. The disclosure emphasizes that this report is not an offer or solicitation and contains forward-looking statements subject to extensive risks, directing investors to carefully review future proxy/prospectus materials and existing risk factor disclosures.

Key Figures

Warrant exercise price: $11.50 per share Investor presentation date: August 19, 2026 Form 10-K filing date: March 31, 2026 +2 more

5 metrics

Warrant exercise price $11.50 per share Each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50

Investor presentation date August 19, 2026 Date of the updated investor presentation furnished as Exhibit 99.1

Form 10-K filing date March 31, 2026 Date Plum IV filed its Annual Report on Form 10-K referenced for risk factors

Form 10-Q filing date May 15, 2026 One of the Quarterly Reports on Form 10-Q cited for additional risk factors

Form 10-Q filing date August 14, 2026 Subsequent Quarterly Report on Form 10-Q referenced in the risk discussion

Key Terms

Business Combination Agreement, Registration Statement on Form S-4, Proxy Statement/Prospectus, special purpose acquisition company, +1 more

5 terms

Business Combination Agreement financial

"Plum IV entered into a Business Combination Agreement with Controlled Thermal Resources"

A business combination agreement is a detailed contract that lays out the terms for two companies to join together—covering price, how ownership will be split, the steps needed to close the deal, and what each side promises to do or avoid before closing. For investors it matters because the agreement determines potential changes in value, control, timing, and risk exposure—think of it like the playbook for a merger that shows who wins, who pays, and what could still derail the plan.

Registration Statement on Form S-4 regulatory

"intend to file with the SEC a registration statement on Form S-4"

A registration statement on Form S-4 is a formal filing with the U.S. Securities and Exchange Commission used when a company issues shares or other securities as part of a merger, acquisition, exchange offer or similar corporate deal. It bundles the transaction terms, financial statements, risk factors and shareholder vote materials so investors can assess the deal; think of it as a detailed prospectus or buyer’s packet that explains what you would own and how the deal could change your stake.

Proxy Statement/Prospectus regulatory

"a preliminary proxy statement of Plum IV as well as a preliminary prospectus"

A proxy statement or prospectus is a document that companies send to shareholders to provide important information about upcoming decisions or investments, such as voting on company issues or offering new shares to the public. It helps investors understand the details and risks involved, enabling them to make informed choices about their ownership or involvement with the company.

special purpose acquisition company financial

"Plum Acquisition Corp. IV, a publicly traded special purpose acquisition company"

A special purpose acquisition company (SPAC) is a company formed with the sole purpose of raising money through a public offering to buy or merge with an existing private business. It acts like a vehicle that allows private companies to go public more quickly and with less complexity. For investors, it offers an opportunity to invest early in a potential acquisition, though it also carries risks if the intended deal doesn’t materialize.

forward-looking statements regulatory

"contain certain forward-looking statements within the meaning of the U.S. federal"

Forward-looking statements are predictions or plans that companies share about what they expect to happen in the future, like estimating sales or profits. They matter because they help investors understand a company's outlook, but since they are based on guesses and assumptions, they can sometimes be wrong.

FAQ

What did Plum Acquisition Corp. IV (PLMK) announce in this current report?

Plum Acquisition Corp. IV furnished an updated investor presentation dated August 19, 2026, regarding its proposed business combination with Controlled Thermal Resources Holdings Inc. The new presentation supersedes a prior March 9, 2026 deck and is provided under Regulation FD for information purposes only.

How does this filing affect the proposed business combination involving PLMK?

The filing supports the proposed business combination by providing an updated investor presentation, but it does not change deal terms. Plum IV and Controlled Thermal Resources intend to file a Form S-4 registration statement and proxy/prospectus for shareholder approval of the transaction.

Will Plum Acquisition Corp. IV (PLMK) seek shareholder approval for the transaction?

Yes. Plum Acquisition Corp. IV plans to mail a definitive proxy statement/prospectus to shareholders after the Form S-4 is declared effective. Shareholders of record will be asked to vote on the business combination and related matters at an extraordinary general meeting.

Is this PLMK current report an offer to sell or buy securities?

No. The report explicitly states it is not a prospectus or an offer to sell, buy, or exchange securities. Any offers will only be made through a prospectus meeting Securities Act requirements or an applicable exemption under U.S. securities laws.

What forward-looking risks does PLMK highlight regarding the proposed transaction?

The company notes that forward-looking statements are subject to risks, including potential termination of the Business Combination Agreement, failure to obtain shareholder approvals, listing issues, project execution risks, lithium price volatility, regulatory changes, and other factors detailed in Plum IV’s Form 10-K and Form 10-Q filings.

Where can investors find more information about the PLMK transaction and proxy materials?

Investors can access the future Form S-4 and proxy/prospectus and related filings free of charge at www.sec.gov. They may also request copies from Plum Acquisition Corp. IV at its San Francisco address or via the dedicated investor relations email plumir@icrinc.com.

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Available on EDGAR 08/20/2026 - 06:11 AM Accepted by SEC EDGAR 08/19/2026 - 09:51 PM Learn about SEC filing dates

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): August 19, 2026

PLUM ACQUISITION CORP. IV

(Exact name of registrant as specified in its charter)

Cayman Islands		001-42472		98-1795710
(State or other jurisdiction of incorporation or organization)		(Commission File Number)		(I.R.S. Employer Identification Number)

2021 Fillmore St. #2089 San Francisco, California		94115
(Address of principal executive offices)		(Zip Code)

Registrant’s telephone number, including area code: (929) 529-7125

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 to 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:

Title of each class		Trading Symbol(s)		Name of each exchange on which registered
Units, each consisting of one Class A ordinary share, par value $0.0001 per share, and one-half of one redeemable warrant		PLMKU		Nasdaq Global Market
Class A ordinary shares, par value $0.0001 per share, included as part of the units		PLMK		Nasdaq Global Market
Warrants included as part of the units, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50		PLMKW		Nasdaq Global Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b-2 of the Securities Exchange Act of 1934.

Emerging growth company ☒

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. ☐

Item 7.01. Regulation FD Disclosure.

As previously disclosed on a Current Report on Form 8-K filed by Plum Acquisition Corp. IV, a publicly traded special purpose acquisition company (“Plum IV”) with the U.S. Securities and Exchange Commission (the “SEC”) on March 12, 2026, Plum IV entered into a Business Combination Agreement (as amended, the “Business Combination Agreement”) with Plum IV Merger Sub, Inc., a Delaware corporation and a direct wholly owned subsidiary of Plum IV, and Controlled Thermal Resources Holdings Inc., a Delaware corporation (the “Company”).

Attached hereto as Exhibit 99.1 and incorporated into this Item 7.01 by reference is an updated form of presentation (the “Updated Investor Presentation”) to be used by the Company and Plum IV in presentations for certain of the Company’s and Plum IV’s shareholders and other persons. The Updated Investor Presentation supersedes in all respects the earlier version of an investor presentation previously furnished as Exhibit 99.1 of the Current Report on Form 8-K filed with the SEC on March 9, 2026.

The information in this Item 7.01, including Exhibit 99.1, is furnished and shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise be subject to the liabilities of that section, nor shall it be deemed to be incorporated by reference in any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act, except as expressly set forth by specific reference in such filing.

Additional Information and Where to Find It

In connection with the transactions contemplated by the Business Combination Agreement (the “Transactions”), Plum IV and the Company intend to file with the SEC a registration statement on Form S-4 (the “Registration Statement”), which will include a preliminary proxy statement of Plum IV as well as a preliminary prospectus relating to the offer of securities to be issued to the stockholders of the Company (the “Proxy Statement/Prospectus”). After the Registration Statement is declared effective, a definitive proxy statement and other relevant documents will be mailed to shareholders of Plum IV as of the record date to be established for voting on the Transactions and other matters as described in the Proxy Statement/Prospectus. Plum IV will also file other documents regarding the Transactions with the SEC. This Current Report on Form 8-K (the “Current Report”) does not contain all of the information that should be considered concerning the Transactions and is not intended to form the basis of any investment decision or any other decision in respect of the Transactions. BEFORE MAKING ANY VOTING OR INVESTMENT DECISION, SHAREHOLDERS OF PLUM IV AND OTHER INTERESTED PARTIES ARE URGED TO READ, WHEN AVAILABLE, THE PRELIMINARY PROXY STATEMENT/PROSPECTUS, AND AMENDMENTS THERETO, AND THE DEFINITIVE PROXY STATEMENT/PROSPECTUS AND ALL OTHER RELEVANT DOCUMENTS FILED OR THAT WILL BE FILED WITH THE SEC IN CONNECTION WITH PLUM IV’S SOLICITATION OF PROXIES FOR THE EXTRAORDINARY GENERAL MEETING OF ITS SHAREHOLDERS TO BE HELD TO APPROVE THE TRANSACTIONS AND OTHER MATTERS AS DESCRIBED IN THE PROXY STATEMENT/PROSPECTUS BECAUSE THESE DOCUMENTS WILL CONTAIN IMPORTANT INFORMATION ABOUT PLUM IV, the Company AND THE TRANSACTIONS. Investors and security holders will also be able to obtain copies of the Registration Statement and the Proxy Statement/Prospectus and all other documents filed or to be filed with the SEC by Plum IV, without charge, once available, on the SEC’s website at www.sec.gov or by directing a request to: Plum Acquisition Corp. IV, 2021 Fillmore St., #2089, San Francisco, California 94115, Attention: Kanishka Roy, or by email at plumir@icrinc.com.

Participants in the Solicitation

Plum IV, the Company and their respective directors and executive officers may be deemed participants under SEC rules in the solicitation of proxies from Plum IV’s shareholders in connection with the Transactions. A list of the names of such directors and executive officers and information regarding their interests in the Transactions and their ownership of Plum IV’s securities is, or will be, contained in Plum IV’s filings with the SEC. Additional information regarding the interests of the persons who may, under SEC rules, be deemed participants in the solicitation of proxies from Plum IV’s shareholders in connection with the Transactions, including the names and interests of the Company’s directors and executive officers, will be set forth in the Proxy Statement/Prospectus, which is expected to be filed by Plum IV and the Company with the SEC. Investors and security holders may obtain free copies of these documents as described above.

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No Offer or Solicitation

This Current Report is for informational purposes only and is not a proxy statement or solicitation of a proxy, consent or authorization with respect to any securities or in respect of the Transactions and shall not constitute an offer to sell or exchange, or a solicitation of an offer to buy or exchange the securities of Plum IV or the Company, or any commodity or instrument or related derivative, nor shall there be any sale of any such securities in any state or jurisdiction in which such offer, solicitation, sale or exchange would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction. This Current Report is not, and under no circumstances is to be construed as, a prospectus, an advertisement or a public offering of the securities described herein in the United States or any other jurisdiction. No offer of securities shall be made except by means of a prospectus meeting the requirements of the Securities Act or an exemption therefrom. Investors should consult with their counsel as to the applicable requirements for a purchaser to avail itself of any exemption under the Securities Act.

Forward-Looking Statements

This Current Report and the exhibits attached hereto contain certain forward-looking statements within the meaning of the U.S. federal securities laws with respect to the Transactions and the parties thereto. All statements contained in this Current Report other than statements of historical fact, including, without limitation, statements regarding the Transactions between Plum IV and the Company; the anticipated benefits and timing of the Transactions; expected trading of the combined company’s securities on the Nasdaq; the building of the Company’s flagship Hell’s Kitchen Project; the anticipated benefits and timing of the Company’s flagship Hell’s Kitchen Project, the combined company’s future financial performance; the ability of the combined company to execute its business strategy, its market opportunity and positioning; and other statements regarding management’s intentions, beliefs, or expectations with respect to the combined company’s future performance, are forward-looking statements.

Forward-looking statements are often identified by the use of words such as “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “might,” “plan,” “potential,” “predict,” “project,” “should,” “will,” “would,” and similar expressions, but the absence of these words does not mean that a statement is not forward-looking.

These forward-looking statements are based on the current expectations and assumptions of Plum IV and the Company and are subject to risks and uncertainties that could cause actual results to differ materially from those expressed or implied by such forward-looking statements. Such risks and uncertainties include, but are not limited to: (1) the occurrence of any event, change or other circumstances that could give rise to the termination of the Business Combination Agreement; (2) the outcome of any legal proceedings that may be instituted against the parties following the announcement of the Transactions and any definitive agreements with respect thereto; (3) the inability to complete the Transactions, including due to failure to obtain approval of the shareholders of Plum IV and the Company or other conditions to closing; (4) the risk that the Transactions may not be completed by Plum IV’s business combination deadline and the potential failure to obtain an extension of the business combination deadline if sought by Plum IV; (5) the inability to maintain the listing of Plum IV’s securities or to obtain or maintain the listing of the combined company’s securities on the Nasdaq, the New York Stock Exchange, or another national securities exchange following the Transactions; (6) the risk that the Transactions disrupts the Company’s current plans, business relationships, performance, operations and business generally as a result of the announcement and consummation of the Transactions; (7) the risk that the price of the combined company’s securities may be volatile due to a variety of factors, including changes in laws, regulations, technologies, natural disasters, geopolitical tensions, and macro-economic and social environments affecting its business; (8) the ability to recognize the anticipated benefits of the Transactions, which may be affected by, among other things, competition, the ability of the combined company to grow and manage growth profitably and retain its key employees; (9) costs related to the Transactions; (10) changes in applicable laws or regulations; (11) risks related to the Company’s business, including fluctuations in demand and prices for lithium and other critical minerals, competition within the industry, the risks inherent in development projects and exploration activities, potential delays or cost overruns in capital expenditures, the ability to secure necessary raw materials, compliance with regulatory requirements, environmental and safety obligations, economic and market conditions, and political or geopolitical developments; and (12) other risks detailed from time to time in Plum IV’s filings with the SEC, including the Registration Statement and related documents filed or to be filed in connection with the Transactions.

The foregoing list of risk factors is not exhaustive. You should carefully consider the foregoing factors and the other risks and uncertainties described in the “Risk Factors” section of Plum IV’s Annual Report on Form 10-K filed with the SEC on March 31, 2026, Plum IV’s Quarterly Reports on Form 10-Q filed with the SEC on May 15, 2026 and August 14, 2026, subsequent Quarterly Reports on Form 10-Q and the Registration Statement and Proxy Statement/Prospectus that will be filed by Plum IV and the Company, and other documents filed by Plum IV from time to time with the SEC, as well as the list of risk factors included herein. These filings identify and address other important risks and uncertainties that could cause actual results to differ materially from those contained in the forward-looking statements. Additional risks and uncertainties not currently known or that are currently deemed immaterial may also cause actual results to differ materially from those expressed or implied by such forward-looking statements. Readers are cautioned not to put undue reliance on forward-looking statements, and none of the parties or any of their representatives assumes any obligation and do not intend to update or revise these forward-looking statements, each of which is made only as of the date of this Current Report.

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Item 9.01. Financial Statements and Exhibits.

(d) Exhibits.

Exhibit No.		Description
99.1		Investor Presentation, dated August 19, 2026
104		Cover Page Interactive Data File (embedded within the Inline XBRL document)

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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.

Date: August 19, 2026	PLUM ACQUISITION CORP. IV
	By:	/s/ Kanishka Roy
	Name:	Kanishka Roy
	Title:	Chief Executive Officer

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