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): ~~December~~April 227, ~~2025~~2026

PLUM ACQUISITION CORP. III

(Exact name of registrant as specified in its charter)

Cayman Islands		001-40677		98-1581691
(State or other jurisdiction of incorporation)		(Commission File Number)		(I.R.S. Employer Identification No.)

2021 Fillmore St. #2089

San Francisco, CA 94115

(Address of principal executive offices) (Zip Code)

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

(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: None.

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 ☒

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 58.0701 ~~Submission~~Other ~~of Matters to a Vote of Security Holders~~Events.

OnAsset ~~December~~Purchase 22, 2025, Plum Acquisition Corp. III (“Plum”) held its Extraordinary General Meeting of shareholders (the “Meeting”). As of the close of business on November 7, 2025, the record date for the Meeting, there were 907,486 Class A ordinary shares, par value $0.0001 per share (a “Class A Share”) and 7,062,500 Class B ordinary shares, par value $0.0001 per share (the “Class B Shares” and, together with the Class A Shares, the “Common Shares”) outstanding, each of which was entitled to one vote with respect to the Domestication Proposal, the Business Combination Proposal, the Advisory Organizational Documents Proposals, the Nasdaq Proposal, the Incentive Plan Proposal, and the Adjournment Proposal. A total of 7,911,075 Common Shares, representing 99.26% of the total Common Shares entitled to vote at the Meeting, were present in person or by proxy, constituting a quorum. The proposals listed below are described in more detail in the proxy statement/prospectus filed by Plum III Merger Corp., a corporation formed under the Laws of the Province of British Columbia (“Pubco”), with the Securities and Exchange Commission on December 1, 2025 (the “Proxy Statement/Prospectus”). A summary of the voting results at the Meeting is set forth below:Agreement

~~Proposal~~On ~~No.~~April 17, –2026, Plum ~~Domestication~~III ~~Proposal:~~Merger ~~Our~~Corp., ~~shareholders~~a ~~approved~~corporation formed under the Laws of the Province of British Columbia (“PubCo”), asSierra Blanca Quarry, LLC, a ~~special~~limited ~~resolution,~~liability company existing under the ~~transfer~~laws of ~~Plum~~the byState ~~way~~ of ~~continuation~~Texas ~~from~~(“Seller”), ~~the~~and ~~Cayman~~Tactical Resources Corp., a ~~Islands~~corporation toincorporated under the laws of the Province of British Columbia, ~~Canada~~(“Buyer” inor ~~accordance~~“Tactical”) ~~with~~entered ~~Plum’s~~into an ~~Amended~~Asset ~~and~~Purchase ~~Restated~~Agreement ~~Memorandum~~(the ~~and~~“Asset ~~Articles~~Purchase ofAgreement”). ~~Association and~~Pursuant to the ~~Cayman~~Asset ~~Islands~~Purchase ~~Companies~~Agreement, ~~Act~~Buyer ~~(As~~will ~~Revised)~~purchase approximately 1.5 million tons of processed tailings from Seller, and ~~the~~PubCo ~~domestication~~will issue, on behalf of ~~Plum~~Buyer, approximately 3,000,000 shares of common stock of PubCo (the “~~Domestication~~Stock Consideration”) asto aSeller ~~British~~at ~~Columbia corporation~~the inclosing ~~accordance~~of ~~with~~the transactions contemplated by the ~~applicable~~Asset Purchase ~~provisions~~Agreement. ofClosing under the ~~Business~~Asset ~~Corporations~~Purchase ~~Act~~Agreement ~~(British~~is ~~Columbia)~~subject to, ~~including~~among other customary conditions, the ~~adoption~~ closing of the ~~Domestication~~previously announced ~~Articles~~business combination among Plum Acquisition Corp. III, a Cayman Islands exempted company (“Plum”), Tactical and PubCo (the “~~Domestication~~Business ~~Proposal~~Combination”) :.

For		Against		Abstain		Broker Non-Vote
7,883,323		17		0		27,735

Additionally, pursuant to the Asset Purchase Agreement, after the closing date thereunder, PubCo will file with the U.S. Securities and Exchange Commission (the “SEC”) a registration statement on Form S-3 or F-3 (or, if PubCo is not then eligible, on Form S-1 for Form F-1) covering the resale by Seller of the Stock Consideration in accordance with applicable SEC rules, regulations and interpretations so as to permit the resale of the Stock Consideration.

~~Proposal~~On ~~No.~~April ~~2 – Business Combination Proposal: Our shareholders approved~~15, ~~as an ordinary resolution~~2026, ~~the Business Combination Agreement, dated as~~Tactical ofpublished ~~August~~a ~~22,~~press ~~2024~~release ~~(as~~announcing ~~may be amended, supplemented or otherwise modified from time to time,~~ the ~~“Business~~Asset ~~Combination~~Purchase Agreement~~” and the transactions contemplated thereby, collectively, the “Business Combination”) by Plum, Plum III Amalco Corp~~., aA ~~corporation formed~~copy ~~under the Laws~~ of the ~~Province~~press ofrelease ~~British~~is ~~Columbia~~attached ~~and~~hereto aas ~~direct,~~Exhibit ~~wholly owned subsidiary of Plum (“Amalco”), PubCo, and Tactical Resources Corp~~99.,1 ~~a corporation formed under the Laws of the Province of British Columbia (“TRC”), including the Arrangement Resolution pursuant to which, among other things~~ and ~~subject to the terms and conditions contained in the Business Combination~~ ~~Agreement~~is ~~and~~incorporated ~~the~~by ~~Plan~~reference of Arrangement (annexed to the Proxy Statement/Prospectus as Annex B), (i) Plum shall effect the Domestication, (ii) following the Domestication, Plum shall amalgamate with PubCo (the “Plum Amalgamation”) to form one corporate entity and PubCo will survive the Plum Amalgamation, and (iii) immediately following the Plum Amalgamation, TRC and Amalco shall amalgamate (the “TRC Amalgamation”) to form one corporate entity and TRC will survive the TRC Amalgamation (the “Business Combination Proposal”):herein.

For		Against		Abstain		Broker Non-Vote
7,883,323		17		0		27,735

The information in Item 8.01, including Exhibit 99.1 attached hereto, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), nor shall it be deemed incorporated by reference in any of Plum’s filings under the Securities Act of 1933, as amended, or the Exchange Act, whether made before or after the date hereof, except as shall be expressly set forth by specific reference to this Current Report on Form 8-K (this “Current Report”) in such filing.

~~Proposal No. 3 – Advisory Organizational Documents Proposals: Our shareholders approved, as an ordinary resolution and on a non~~Forward-~~binding~~Looking advisory basis, the following four (4) separate resolutions regarding the governance provisions contained in the PubCo Closing Articles (annexed to the Proxy Statement/Prospectus as Annex E) that materially affect Plum shareholders’ rights (the “Advisory Organizational Documents Proposals”):Statements

~~Advisory~~This ~~Organizational~~Current Report contains ~~Documents~~certain ~~Proposal~~forward-looking A:statements towithin ~~change~~the meaning of the ~~authorized~~“safe ~~share~~harbor” ~~capital~~provisions ~~from~~of the ~~existing~~United ~~(i)~~States ~~200,000,000~~Private ~~Class~~Securities Litigation AReform ~~Shares,~~Act ~~(ii)~~of ~~20,000,000~~1995. ~~Class B~~These ~~Shares,~~forward-looking ~~and~~statements ~~(iii)~~generally 1are identified by words such as “believe,~~000~~” “project,~~000~~” “expect,” ~~preference~~“anticipate,” ~~shares~~“estimate,” of“intend,” a“strategy,” ~~nominal~~“future,” “opportunity,” or“plan,” ~~par~~“potential,” ~~value~~“predict,” of“may,” ~~$0.0001~~“might,” “could,” ~~each~~“should,” to“will,” an“would,” ~~unlimited~~“will ~~number~~be,” of“will ~~common~~continue,” “will ~~shares~~likely ~~of PubCo~~result,” ~~par~~and ~~value~~similar ~~$0.0001~~expressions ~~per~~and ~~share~~each ~~(“PubCo~~of ~~Common~~their ~~Shares”)~~respective negative forms.

For		Against		Abstain		Broker Non-Vote
7,883,320		17		3		27,735

These forward-looking statements include, but are not limited to, statements regarding Plum’s and Tactical’s businesses; the expected timing of the completion or benefits of the Business Combination or the likelihood or ability of the parties to successfully complete the Business Combination; expectations with respect to future operating and financial results for Pubco, Plum and Tactical; and the expected ownership structure of Pubco. These statements are based on various assumptions, whether or not identified in this report, and on the current expectations of Tactical’s and Plum’s management, and are not predictions of actual performance or results. These forward-looking statements are provided for illustrative purposes only and are not intended to serve as, and must not be relied upon as a guarantee, an assurance, a prediction or a definitive statement of fact or probability.

~~Advisory~~Forward-looking ~~Organizational~~statements ~~Documents~~are ~~Proposal~~predictions, Bprojections and other statements about future events that are based on current expectations and assumptions and are subject to inherent risks and uncertainties that may cause Plum’s, Pubco’s or Tactical’s activities or results to differ significantly from those expressed in any forward-looking statement, including: (a) changes in domestic and foreign business, market, financial, political and legal conditions; (b) the likelihood of completion of the Business Combination, including the risk that the Business Combination may not close due to ~~reduce~~one or more closing conditions set forth in the ~~requisite~~definitive ~~quorum~~written agreement providing for the Business Combination not being satisfied or waived on a ~~meeting~~timely basis or otherwise, or that any applicable regulatory approvals may not be obtained; (c) the risk that the Business Combination may not be completed in a timely manner or at all, which may adversely affect the price of ~~shareholders~~Plum’s or ~~from~~Tactical’s securities; (xd) ~~one~~the outcome of any legal proceedings that may be instituted against the parties, or ~~more~~any ~~shareholders~~of ~~holding~~their atrespective directors ~~least~~or executive officers, following the announcement of the Business Combination; (e) changes to the proposed structure of the Business Combination that may be required or appropriate as a ~~majority~~result of applicable laws or regulations or as a condition to obtaining applicable regulatory approvals for the ~~paid~~Business upCombination; ~~voting~~(f) ~~share~~failure ~~capital~~to ~~present~~realize the anticipated benefits of the Business Combination; (g) the potential inability to consummate any PIPE financing on terms or in ~~person~~amounts satisfactory to the parties; (h) the occurrence of any event, change or byother ~~proxy~~circumstance ~~and~~that ~~entitled~~could give rise to ~~vote~~the attermination ~~that~~of ~~meeting~~the definitive written agreement providing for the Business Combination; (i) the ability of Pubco to meet stock exchange listing standards following the consummation of the Business Combination; (yj) ~~not~~the ~~less~~effect ~~than~~of the announcement or pendency of the Business Combination on the market price of securities, business relationships, ~~one~~operating ~~person~~results, ~~holding~~current plans and operations of Plum or ~~representing~~Tactical; ~~not~~(k) ~~less~~risks ~~than~~related 5%to the rollout of Tactical’s business and the ~~shares~~timing ~~entitled~~of expected business milestones; (l) the effects of competition of the Business Combination on Tactical’s or Pubco’s business and operations; (m) supply shortages in the materials necessary for Tactical’s business; (n) delays in construction and operation of facilities; (o) the amount of redemption requests made by Tactical’s public shareholders; (p) changes in applicable laws or regulations; (q) risks relating to bethe ~~voted~~viability atof Tactical’s growth strategy, including related capabilities and ability to execute on its business strategy; (r) the parties’ estimates of growth and projected financial results and meeting or satisfying the underlying assumptions with respect thereto; (s) the possibility that the parties may be adversely affected by other economic, business, and/or competitive factors, or adverse macroeconomic conditions, including inflation, supply chain delays and increased interest rates; (t) the potential disruption of Tactical’s management’s time from ongoing business operations due to the Business Combination; (u) the potential occurrence of a materially adverse change with respect to the financial position, performance, operations or prospects of Plum or Tactical; (v) costs related to the Business Combination; and (w) other risks and uncertainties described from time to time in filings by the parties with the SEC or the Canadian Securities Administrators (the “CSA”), or otherwise made available to interested parties in connection with the Business Combination.

For		Against		Abstain		Broker Non-Vote
7,883,323		17		0		27,735

The foregoing list is not exhaustive, and new risks may emerge from time to time. If any of these risks materialize or the parties’ assumptions prove incorrect, actual results could differ materially from the results implied by these forward-looking statements. Many factors could cause actual future events to differ materially from the forward-looking statements in this Current Report. There may be additional risks that neither Plum nor Tactical presently know or that Plum and Tactical currently believe are immaterial that could also cause actual results to differ from those contained in the forward-looking statements. You should carefully consider the risks and uncertainties described in the “Risk Factors” section of Plum’s Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, and other documents filed by Plum from time to time with the SEC and by Tactical from time to time with the CSA. These filings identify and address other important risks and uncertainties that could cause actual events and results to differ materially from those contained in the forward-looking statements. Forward-looking statements speak only as of the date they are made. Readers are cautioned not to put undue reliance on forward-looking statements, and Plum and Tactical assume no obligation to update or revise these forward-looking statements, whether as a result of new information, future events, or otherwise, except as required by law. Neither Plum nor Tactical gives any assurance that Pubco or Tactical will achieve its expectations.

~~Advisory~~Item ~~Organizational Documents Proposal C: to change the name of the company from “Plum III Merger Corp~~9.”01 toFinancial ~~“Tactical~~Statements ~~Resources~~and ~~Corporation”.~~Exhibits

For		Against		Abstain		Broker Non-Vote
7,911,058		17		0		0

(d) Exhibits

Advisory Organizational Documents Proposal D: to not include in the PubCo Closing Articles provisions relating to the Class B Shares, the initial public offering of Plum consummated on July 30, 2021, Plum’s sponsor (Mercury Capital LLC), the initial business combination (whereby Plum was formed for the purpose of entering into a merger, share exchange, asset acquisition, share purchase, reorganization or similar business combination with one or more businesses), and other related matters.

Exhibit No.		Description
99.1		Press Release of Tactical Resources Corp., dated April 15, 2026.
104		Cover Page Interactive Data File (embedded within the Inline XBRL document)

For		Against		Abstain		Broker Non-Vote
7,883,323		17		0		27,735

Proposal No. 4 – Nasdaq Proposal: Our shareholders approved, as an ordinary resolution, for the purposes of complying with the applicable listing rules of The Nasdaq Stock Market LLC, (i) the issuance of PubCo Common Shares in connection with the Business Combination and (ii) the issuance of an aggregate of up to $100,000,000 of PubCo Common Shares from time to time to YA II PN, LTD. (“Yorkville”) over a 36-month period following the closing of the Business Combination pursuant to the Yorkville financing (as described in more detail in the Proxy Statement/Prospectus) (the “Nasdaq Proposal”):SIGNATURES

For		Against		Abstain		Broker Non-Vote
7,883,323		17		0		27,735

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 thereunto duly authorized.

Proposal No. 5 – Incentive Plan Proposal: Our shareholders approved, as an ordinary resolution, for the purposes of complying with the rules of the Nasdaq Stock Market, the issuance of PubCo Common Shares pursuant to the PubCo Omnibus Equity Incentive Plan (annexed to the Proxy Statement/Prospectus as Annex K) (the “Incentive Plan Proposal”):

	PLUM ACQUISITION CORP. III

Date: April 15, 2026	By:	/s/ Kanishka Roy
	Name:	Kanishka Roy
	Title:	President and Chief Executive Officer

For		Against		Abstain		Broker Non-Vote
7,883,320		17		3		27,735

Proposal No. 6 – Adjournment Proposal: As there were sufficient votes at the time of the meeting to approve the Domestication Proposal, the Business Combination Proposal, the Advisory Organizational Documents Proposals, the Nasdaq Proposal, and the Incentive Plan Proposal, the Adjournment Proposal, which had previously been voted on by proxy, was rendered moot and not presented to shareholders at the Meeting.

SIGNATURES

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.

	PLUM ACQUISITION CORP. III
Dated: December 29, 2025
	By:	/s/ Kanishka Roy
		Name:	Kanishka Roy
		Title:	President and Chief Executive Officer

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