UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

~~Washington~~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~~Report (Date of earliest event reported): ~~April~~May 224, 2026

Yorkville Acquisition Corp.

(Exact name of ~~registrant~~Registrant as ~~specified~~Specified in ~~its~~Its ~~charter~~Charter)

Cayman Islands	001-42720	98-1850073
(State or other jurisdiction of incorporation)	(Commission File Number)	(I.R.S. Employer Identification No.)
(State or Other Jurisdiction of Incorporation)	(Commission File Number)	(IRS Employer Identification No.)

1012 Springfield Avenue
Mountainside, NJ		07092
Mountainside, New Jersey		07092
(Address of principal executive offices)		(Zip Code)
(Address of Principal Executive Offices)		(Zip Code)

Registrant’s Telephone Number, Including Area Code: (201) 985-8300

(Registrant’s telephone number, including area code)

N/A

(Former ~~name~~Name or ~~former~~Former ~~address~~Address, if ~~changed~~Changed ~~since~~Since ~~last~~Last ~~report~~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:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Units, each consisting of one Class A ordinary share and one-third of one redeemable warrant	MCGAU	The Nasdaq Stock Market LLC
Class A ordinary shares, par value $0.0001 per share	MCGA	The Nasdaq Stock Market LLC
Class A ordinary shares, $0.0001 par value	MCGA	The Nasdaq Stock Market LLC
Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50	MCGAW	The Nasdaq Stock Market LLC
Warrants, each whole warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share	MCGAW	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 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 51.0201. ~~Departure~~Entry ofinto ~~Directors~~a orMaterial ~~Certain~~Definitive ~~Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers~~Agreement.

~~Departure~~Amended ofand ~~Director~~Restated ~~and~~Working ~~Executive~~Capital ~~Officer~~Note

On ~~April~~February 2211, 2026, MrYorkville Acquisition Corp. ~~Kevin~~ ~~McGurn~~(the “Company”) ~~notified~~issued a convertible unsecured promissory note (the ~~board~~“Prior ofNote”) ~~directors~~in the aggregate principal amount of ~~Yorkville~~$250,000.00 to Yorkville Acquisition ~~Corp.~~Sponsor, LLC, a Delaware limited liability company (the “~~Company~~Sponsor”), ofin ~~his~~order ~~resignation~~to asprovide ~~Chief~~the ~~Executive~~Company ~~Officer~~with additional ~~and~~working capital, as apreviously ~~director~~disclosed ofin the Company,’s ~~effective~~Current ~~immediately~~Report on Form 8-K filed with the U.S. MrSecurities and Exchange Commission (the “SEC”) on February 17, 2026. On May ~~McGurn’s~~4, ~~resignation~~2026, ~~was~~the ~~not~~Sponsor advanced an additional $250,000 to the Company ~~result~~for additional working capital purposes. Also on May 4, 2026, in order to document such additional advance, the Company issued an amended and restated convertible unsecured promissory note (the “Amended and Restated Working Capital Note”) in the aggregate principal amount of ~~any~~$500,000.00 ~~dispute~~to orthe ~~disagreement~~Sponsor, which amends, restates, supersedes and replaces the Prior Note in its entirety. Pursuant ~~with~~to the terms of the Amended and Restated Working Capital Note, the principal balance shall not accrue interest; shall be payable by the Company on ~~any~~the ~~matter,~~earlier ~~whether~~of ~~related~~the todate on which the Company consummates its initial business combination or the date that the winding up of the Company is effective; and is convertible at the Sponsor’s ~~operations,~~election ~~policies,~~upon ~~practices~~the orconsummation ~~otherwise.~~of ~~The~~the Company’s ~~expresses~~initial business ~~its~~combination. ~~gratitude~~Should the Sponsor elect to Mrconvert all or a portion of the principal balance, the elected principal balance amount will convert, at a price of $10. ~~McGurn~~00 ~~for~~per ~~his~~unit, ~~dedicated~~into ~~service~~units identical to the private placement units issued in connection with the Company’s initial public offering (each, a “New Unit”), rounded down to the nearest whole number.

~~Appointment~~The foregoing description of ~~New~~the ~~Executive~~Amended ~~Officer~~and Restated Working Capital Note does not purport to be complete and is qualified in its entirety by reference to the full text of the Amended and Restated Working Capital Note, which is filed hereto as Exhibit 10.1 and which is incorporated herein by reference.

OnItem ~~April 22, 2026, Mr~~2. ~~Troy~~03. ~~Rillo~~Creation ~~was appointed as Chief Executive Officer~~ of ~~the~~a ~~Company~~Direct byFinancial ~~the~~Obligation ~~Company’s~~or ~~board~~an ofObligation ~~directors,~~under ~~effective~~an ~~immediately.~~Off-Balance ~~Mr. Rillo~~Sheet ~~will continue~~Arrangement ~~to serve as Chief Financial Officer~~ of ~~the~~a ~~Company~~Registrant.

~~Mr. Rillo,~~The ~~57,~~information ~~has~~disclosed ~~served~~under asItem ~~Chief Financial Officer of the Company since August 2025~~1.01 Mr. Rillo is a partner with Yorkville Advisors where, since 2004, he has been instrumental in the firm’s growth and strategic direction. Mr. Rillo is an accomplished business executive and attorney with extensive experience in corporate finance, securities law, and investment management. Mr. Rillo also currently serves as Co-Chief Executive Officer of ~~Yorkville~~ ~~Securities~~this ~~LLC,~~Current anReport SEC registered broker-dealer and member of FINRA, and President and Chief Executive Officer, and member of the Board of Managers, of Yorkville America, LLC, an affiliated SEC-registered investment adviser focused on ~~branded investment products,~~ ~~including separately managed accounts and exchange-traded funds. Additionally, Mr.~~Form Rillo has served as the Chief Financial Officer at Texas Ventures Acquisition III Corp since September 2025, and as the Chief Financial Officer of Blue Water Acquisition Corp. III since November 2025. Prior to joining Yorkville Advisors, Mr. Rillo was a corporate and securities partner at 8-K&L ~~Gates LLP, a leading international law firm, where he advised public and private companies on capital-raising transactions, mergers and acquisitions, and securities compliance. Mr. Rillo~~ is ~~widely~~incorporated ~~recognized~~by asreference aninto ~~authority~~this inItem ~~corporate and securities law and is a frequent speaker on related topics~~2. ~~He earned both his J~~03.D. and B.S. in Finance, magna cum laude, from the University of Florida. While in law school, he served as a member of the Florida Law Review and was elected to the Order of the Coif. He is admitted to practice law in New Jersey and Florida.

NoItem ~~family relationships exist between Mr~~3. ~~Rillo and any of the Company’s directors or other executive officers~~02. ~~There~~Unregistered isSales no arrangement or understanding between Mr. Rillo and any other person pursuant to which he was selected as Chief Executive Officer. There is no material plan, contract or arrangement (whether or not written) to which Mr. Rillo is a party or in which he participates that was entered into, or materially amended, in connection with his appointment as Chief Executive Officer, and no grant or award (or modification thereto) was made to Mr. Rillo under any such plan, contract or arrangement in connection with his appointment. Mr. Rillo is a Partner of ~~Yorkville~~Equity Advisors, an affiliate of Yorkville Acquisition Sponsor, LLC, the Company's sponsor (the “Sponsor”). As a result, Mr. Rillo may be deemed to have an indirect interest in the arrangements between the Company and the Sponsor (and its affiliates) that have been previously described in the Company's filings with the Securities ~~and Exchange Commission~~. ~~Other than as previously disclosed or described herein, there are no transactions involving Mr. Rillo that would require disclosure under Item 404(a) of Regulation S-K.~~

~~SIGNATURE~~The information disclosed under Item 1.01 of this Current Report on Form 8-K is incorporated by reference into this Item 3.02. The Amended and Restated Working Capital Note shall be convertible into a maximum of 50,000 New Units. Each New Unit will consist of one Class A ordinary share of the Company, par value $0.0001 per share (each, a “Class A Ordinary Share”), and one-third of one redeemable warrant, with each whole warrant entitling the holder to purchase one Class A Ordinary Share, at an exercise price of $11.50 per share, which will become exercisable 30 days after the completion of the Company’s initial business combination, subject to certain terms and conditions.

~~Pursuant~~The toCompany ~~the~~has ~~requirements~~ relied upon Section 4(a)(2) of the Securities ~~Exchange~~ Act of ~~1934~~1933, ~~the~~as ~~registrant~~amended, ~~has~~in ~~duly~~connection ~~caused~~with ~~this~~the ~~report~~issuance toof bethe ~~signed~~Amended onand ~~its~~Restated ~~behalf~~Working byCapital ~~the undersigned hereunto duly authorized~~Note.

~~YORKVILLE~~Item ~~ACQUISITION CORP~~9.01. ~~By:~~Financial ~~/s/~~Statements ~~Troy Rillo Name: Troy Rillo Title: Chief Executive Officer~~ and ~~Chief Financial Officer~~Exhibits.

~~Date: April 24, 2026~~(d) Exhibits.

Exhibit No.		Description

10.1		Amended and Restated Working Capital Note, dated May 4, 2026, issued by the Company to the Sponsor.
104		Cover Page Interactive Data File (embedded within the 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.

YORKVILLE ACQUISITION CORP.

By:	/s/ Troy Rillo
Name:	Troy Rillo
	Chief Executive Officer and Financial Officer

Date: July 15, 2026

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