8-K

UNITED

STATES

SECURITIES

AND EXCHANGE COMMISSION

WASHINGTON,

DC 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): September 17, 2025

CAYSON ACQUISITION CORP
(Exact<br> Name of Registrant as Specified in Charter)
Cayman Islands	001-42280	N/A 00-0000000
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(State<br> or Other Jurisdiction<br><br> <br>of<br> Incorporation)	(Commission<br><br> <br>File<br> Number)	(IRS<br> Employer<br><br> <br>Identification<br> No.)
205 W 37th St, New York, New York	10018
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(Address of Principal Executive<br> Offices)	(Zip Code)

Registrant’s telephone number, including area code: (203) 998-5540

N/A
(Former Name or Former Address,<br> 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 (see General Instruction A.2. below):

☒	Written communications<br> pursuant to Rule 425 under the Securities Act (17 CFR 230.425).
☐	Soliciting material pursuant<br> to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12).
☐	Pre-commencement communications<br> pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)).
☐	Pre-commencement communications<br> 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 ordinary share and one right	CAPNU	The Nasdaq Stock Market LLC
Ordinary Shares, par value $0.0001 per share	CAPN	The Nasdaq Stock Market LLC
Rights, each entitling the holder to one tenth of one ordinary share upon the completion of the Company’s initial business combination	CAPNR	The Nasdaq Stock Market LLC

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 2.03	Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

Effective as of September 17, 2025, Cayson Holding LP, a sponsor of Cayson Acquisition Corp. (the “SPAC”), and Mango Financial Limited (“Mango Financial”) loaned the SPAC an aggregate of $600,000. Such funds will be deposited into the trust account established by the SPAC in connection with its initial public offering pursuant to the SPAC’s Amended and Restated Memorandum and Articles of Association and trust agreement governing the trust account in order to extend the time that the SPAC has to consummate an initial business combination (a “Business Combination”) from September 23, 2025 to January 23, 2026. The loans are evidenced by promissory notes (the “Notes”) issued by the SPAC to the lenders. The Notes bear no interest and are repayable in full upon consummation of a Business Combination.

A copy of the form of Notes is attached as Exhibit 10.1 to this Current Report on Form 8-K and is incorporated herein by reference. The disclosures set forth in this Item 2.03 are intended to be summaries only and are qualified in their entirety by reference to the Notes.

As previously disclosed, on July 11, 2025, the SPAC entered into an Agreement and Plan of Merger (the “Merger Agreement”), by and among the SPAC, Mango Financial Group Limited, a Cayman Islands exempted company (the “Company”), North Water Investment Group Holdings Limited (“North Water”), the parent company of Mango Financial, and Mango Temp Limited, a Cayman Islands exempted company and a wholly-owned subsidiary of the Company (“Merger Sub”).

AdditionalInformation and Where to Find It

In connection with the proposed business combination among the SPAC, the Company and Merger Sub (the “Business Combination”, the SPAC and the Company intend to file relevant materials with the SEC, including a Registration Statement on Form F-4 (the “Registration Statement”), which will include a preliminary proxy Statement and prospectus. After the Registration Statement is declared effective by the U.S. Securities and Exchange Commission (the “SEC”)., the definitive proxy statement and prospectus and other relevant documents will be mailed to the shareholders of the SPAC as of the record date established for voting on the proposed Business Combination and will contain important information about the proposed Business Combination and related matters. Shareholders of the SPAC and other interested persons are advised to read, when available, these materials (including any amendments or supplements thereto) and any other relevant documents in connection with the SPAC’s solicitation of proxies for the meeting of SPAC shareholders to be held to approve, among other things, the proposed Business Combination, because they will contain important information about the SPAC, the Company and the proposed Business Combination. Shareholders will also be able to obtain copies of the preliminary proxy statement and prospectus, the definitive proxy statement and prospectus and other relevant materials in connection with the transaction without charge, each, when available, at the SEC’s website at www.sec.gov or by directing a request to: Cayson Acquisition Corp, c/o Yawei Cao, 420 Lexington Avenue, Suite 2446, New York, NY 10170, Telephone: (203) 998-5540.

Participantsin the Solicitation

The SPAC and its respective directors and executive officers may be deemed participants in the solicitation of proxies from the SPAC shareholders in connection with the proposed Business Combination. The SPAC shareholders and other interested persons may obtain, without charge, more detailed information regarding the directors and officers of the SPAC as reflected of the SPAC’s final prospectus of September 20, 2024, in connection with the SPAC’s initial public offering, as filed with the SEC. Information regarding the persons who may, under SEC rules, be deemed participants in the solicitation of proxies to the SPAC shareholders in connection with the proposed Business Combination will be set forth in the proxy statement and prospectus for the proposed Business Combination when available. Additional information regarding the interests of participants in the solicitation of proxies in connection with the proposed Business Combination will be included in the proxy statement and prospectus to be included in the Registration Statement and filed with the SEC. You may obtain free copies of these documents as described in the preceding paragraph.

The Company and its respective directors and executive officers may also be deemed to be participants in the solicitation of proxies from the SPAC shareholders in connection with the proposed Business Combination. A list of the names of such directors and executive officers and information regarding their interests in the proposed Business Combination will be included in the proxy statement and prospectus for the proposed Business Combination when available.

NoSolicitation or Offer

This communication shall neither constitute an offer to sell nor the solicitation of an offer to buy any securities, or the solicitation of any proxy, vote, consent or approval in any jurisdiction in connection with the Business Combination, nor shall there be any sale of securities in any jurisdiction in which the offer, solicitation or sale would be unlawful prior to any registration or qualification under the securities laws of any such jurisdictions. This communication is restricted by law; it is not intended for distribution to, or use by any person in, any jurisdiction where such distribution or use would be contrary to local law or regulation.

Forward-LookingStatements Legend

This communication contains forward-looking statements. The words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “might,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “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. All statements other than statements of historical facts contained in this communication, including statements regarding the expected timing and structure of the Business Combination, the ability of the parties to complete the Business Combination, the expected benefits of the Business Combination, the tax consequences of the Business Combination, the amount of gross proceeds expected to be available to the SPAC after the closing of the Business Combination and giving effect to any redemptions by the SPAC shareholders, the Company’s future results of operations and financial position, business strategy and its expectations regarding the application and commercialization of its products[this sentence needs a verb and an object]. These forward-looking statements are not guarantees of future performance, conditions or results, and involve a number of known and unknown risks, uncertainties, assumptions and other important factors, many of which are outside the control of the SPAC and the Company, that could cause actual results or outcomes to differ materially from those discussed in the forward-looking statements. Important factors, among others, that may affect actual results or outcomes include, but are not limited to: the risk that the transactions may not be completed in a timely manner or at all, which may adversely affect the price of the SPAC’s securities; the risk that the SPAC shareholders’ approval of the Business Combination is not obtained; the inability to realize the anticipated benefits of the Business Combination, which may be affected by, among other things, the amount of funds available in the SPAC’s trust account following any redemptions by the SPAC shareholders; the failure to receive certain governmental and regulatory approvals; the occurrence of any event, change or other circumstance that could give rise to the termination of the Merger Agreement; changes in general economic or business conditions; the outcome of litigation related to or arising out of the Business Combination, or any adverse developments therein or delays or costs resulting therefrom; the effect of the announcement or pendency of the transaction on the SPAC’s or the Company’s respective business relationships, operating results, and businesses generally; the ability of the Company to meet Nasdaq’s listing standards in connection with and following the consummation of the Business Combination; costs related to the Business Combination; that the price of the Company’s securities may be volatile due to a variety of factors, including the SPAC’s or the Company’s inability to implement their respective business plans or meet or exceed their financial projections and changes in the combined capital structure; the ability to implement business plans, forecasts, and other expectations after the completion of the Business Combination, and identify and realize additional opportunities; and the ability of the Company to implement its strategic initiatives.

The foregoing list of factors is not exhaustive. You should carefully consider the foregoing factors and the other risks and uncertainties described in the “Risk Factors” section of the SPAC’s registration statement on Form S-1 (File No. 333-280564), in the Registration Statement (once available), and in the other documents filed or that may be filed by the SPAC from time to time with the SEC following the date hereof. 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 the SPAC assumes no obligation and does not intend to update or revise these forward-looking statements, whether as a result of new information, future events, or otherwise.

The SPAC does not give any assurance that the SPAC or the Company will achieve their expectations.

Item9.01. Financial Statements and Exhibits.

(d) Exhibits. The following exhibits are filed with this Form 8-K:

Exhibit No.	Description of Exhibits
10.1	Form of Promissory Note
104	Cover Page Interactive Data File (embedded within the<br> Inline XBRL document)

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.

Dated:<br> September 18, 2025	CAYSON ACQUISITION CORP
	By:	/s/ Yawei Cao
		Yawei Cao
		Chief Executive Officer

Exhibit10.1

PROMISSORY NOTE

$______	As<br> of _______, 2025

Cayson Acquisition Corp (“Maker”) promises to pay to the order of ___________ or its successors or assigns (“Payee”) the principal sum of ___________ Dollars and No Cents ($_____) in lawful money of the United States of America, on the terms and conditions described below.

1. Principal. The principal balance of this Note shall be repayable on the consummation of the Maker’s initial merger, capital share exchange, asset acquisition or other similar business combination with one or more businesses or entities (a “Business Combination”). Payee understands that if a Business Combination is not consummated, this Note will not be repaid and all amounts owed hereunder will be forgiven except to the extent that the Maker has funds available to it outside of its trust account established in connection with its initial public offering.

2. Interest. No interest shall accrue on the unpaid principal balance of this Note.

3. Application of Payments. All payments shall be applied first to payment in full of any costs incurred in the collection of any sum due under this Note, including (without limitation) reasonable attorneys’ fees, then to the payment in full of any late charges and finally to the reduction of the unpaid principal balance of this Note.

4. Events of Default. The following shall constitute Events of Default:

(a) Failure to Make Required Payments. Failure by Maker to pay the principal of this Note within five (5) business days following the date when due.

(b) Voluntary Bankruptcy, Etc. The commencement by Maker of a voluntary case under the Federal Bankruptcy Code, as now constituted or hereafter amended, or any other applicable federal or state bankruptcy, insolvency, reorganization, rehabilitation or other similar law, or the consent by it to the appointment of or taking possession by a receiver, liquidator, assignee, trustee, custodian, sequestrator (or other similar official) of Maker or for any substantial part of its property, or the making by it of any assignment for the benefit of creditors, or the failure of Maker generally to pay its debts as such debts become due, or the taking of corporate action by Maker in furtherance of any of the foregoing.

(c) Involuntary Bankruptcy, Etc. The entry of a decree or order for relief by a court having jurisdiction in the premises in respect of maker in an involuntary case under the Federal Bankruptcy Code, as now or hereafter constituted, or any other applicable federal or state bankruptcy, insolvency or other similar law, or appointing a receiver, liquidator, assignee, custodian, trustee, sequestrator (or similar official) of Maker or for any substantial part of its property, or ordering the winding-up or liquidation of its affairs, and the continuance of any such decree or order unstayed and in effect for a period of 60 consecutive days.

5. Remedies.

(a) Upon the occurrence of an Event of Default specified in Section 4(a), Payee may, by written notice to Maker, declare this Note to be due and payable, whereupon the principal amount of this Note, and all other amounts payable thereunder, shall become immediately due and payable without presentment, demand, protest or other notice of any kind, all of which are hereby expressly waived, anything contained herein or in the documents evidencing the same to the contrary notwithstanding.

(b) Upon the occurrence of an Event of Default specified in Sections 4(b) and 4(c), the unpaid principal balance of, and all other sums payable with regard to, this Note shall automatically and immediately become due and payable, in all cases without any action on the part of Payee.

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6. Intentionally Omitted.

7. Waivers. Maker and all endorsers and guarantors of, and sureties for, this Note waive presentment for payment, demand, notice of dishonor, protest, and notice of protest with regard to the Note, all errors, defects and imperfections in any proceedings instituted by Payee under the terms of this Note, and all benefits that might accrue to Maker by virtue of any present or future laws exempting any property, real or personal, or any part of the proceeds arising from any sale of any such property, from attachment, levy or sale under execution, or providing for any stay of execution, exemption from civil process, or extension of time for payment; and Maker agrees that any real estate that may be levied upon pursuant to a judgment obtained by virtue hereof, on any writ of execution issued hereon, may be sold upon any such writ in whole or in part in any order desired by Payee.

8. Unconditional Liability. Maker hereby waives all notices in connection with the delivery, acceptance, performance, default, or enforcement of the payment of this Note, and agrees that its liability shall be unconditional, without regard to the liability of any other party, and shall not be affected in any manner by any indulgence, extension of time, renewal, waiver or modification granted or consented to by Payee, and consents to any and all extensions of time, renewals, waivers, or modifications that may be granted by Payee with respect to the payment or other provisions of this Note, and agree that additional makers, endorsers, guarantors, or sureties may become parties hereto without notice to them or affecting their liability hereunder.

9. Notices. Any notice called for hereunder shall be deemed properly given if (i) sent by certified mail, return receipt requested, (ii) personally delivered, (iii) dispatched by any form of private or governmental express mail or delivery service providing receipted delivery, (iv) sent by telefacsimile or (v) sent by e-mail, to the following addresses or to such other address as either party may designate by notice in accordance with this Section:

If to Maker:

Cayson Acquisition Corp.

420 Lexington Avenue, Suite 2446

New York, New York 10170

If to Payee:

[INSERT NAME AND ADDRESS]

Notice shall be deemed given on the earlier of (i) actual receipt by the receiving party, (ii) the date shown on a telefacsimile transmission confirmation, (iii) the date on which an e-mail transmission was received by the receiving party’s on-line access provider (iv) the date reflected on a signed delivery receipt, or (vi) two (2) Business Days following tender of delivery or dispatch by express mail or delivery service.

10. Construction. This Note shall be construed and enforced in accordance with the domestic, internal law, but not the law of conflict of laws, of the State of New York.

11. Severability. Any provision contained in this Note which is prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective to the extent of such prohibition or unenforceability without invalidating the remaining provisions hereof, and any such prohibition or unenforceability in any jurisdiction shall not invalidate or render unenforceable such provision in any other jurisdiction.

IN WITNESS WHEREOF, Maker, intending to be legally bound hereby, has caused this Note to be duly executed the day and year first above written.

CAYSON<br> ACQUISITION CORP
By:
Name:
Title: