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)

October 30, 2026

BLACK SPADE ACQUISITION III CO

(Exact Name of Registrant as Specified in its Charter)

Cayman Islands		001-43039		N/A
(State or other jurisdiction of incorporation)		(Commission File Number)		(I.R.S. Employer Identification No.)

Suite 2902, 29/F, The Centrium, 60 Wyndham Street, Central, Hong Kong		N/A
(Address of Principal Executive Offices)		(Zip Code)

Registrant’s telephone number, including area code: + 852 3955 1316

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 (see General Instruction A.2. below):

¨	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
Class A ordinary shares, $0.0001 par value, included as part of the units	BIII	The New York Stock Exchange
Redeemable warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50, included as part of the units	BIIIW	The New York Stock Exchange
Units, each consisting of one Class A ordinary share and one-third of one redeemable warrant	BIIIU	The New York Stock Exchange

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. ¨

Item 1.01 Entry Into A Material Definitive Agreement.

The disclosure contained in Item 2.03 is incorporated by reference in this Item 1.01.

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

On October 30, 2026, Black Spade Acquisition III Co (the “Company”) issued an unsecured promissory note (the “Note”) in the amount of up to $200,000 to Black Spade Sponsor LLC III (the “Payee”). The proceeds of the Note, which may be drawn down from time to time prior to the Maturity Date (as defined below), will be used for costs and expenses related to the Company’s proposed business combination (the “Business Combination”). The Note bears no interest and is payable in full upon the earlier of (i) March 31, 2027 and (ii) the date on which the Company consummates its Business Combination (such earlier date, the “Maturity Date”). The principal balance of the Note may be prepaid at any time by the Company without penalty. A failure to pay the principal within five business days of the Maturity Date or the commencement of a voluntary or involuntary bankruptcy action shall be deemed an event of default, in which case the Note may be accelerated.

The issuance of the Note was made pursuant to the exemption from registration contained in Section 4(a)(2) of the Securities Act of 1933, as amended.

A copy of the Note 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 full text of the Note.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.	Exhibit
10.1	Promissory Note dated October 30, 2026, issued by Black Spade Acquisition III Co to Black Spade Sponsor LLC III
104	Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

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

Date: November 2, 2026

	BLACK SPADE ACQUISITION III CO

	By:	/s/ Chi Wai Dennis Tam
	Name:	Chi Wai Dennis Tam
	Title:	Executive Chairman of the Board and Co-Chief Executive Officer