Company: MCGAU
Filing Date: 2025-08-26
Form Type: 425
Source: 0001104659-25-083156
Chunk: 18

Company: Yorkville Acquisition Corp.
Filing Date: 2025-08-26
Form: 425
Chunk 18
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 of Lock-Up Agreement, a copy of which is filed with this Current Report on Form 8-K as Exhibit 10.4
to this Current Report, and the terms of which are incorporated into this Current Report by reference.

Stock Purchase Agreement

In connection with the Transactions, the Company
and the Investor will enter into a Stock Purchase Agreement at the Closing, pursuant to which the Investor will commit to purchase up
to $5,000,000,000 of the SPAC Class A Common Stock (the “Commitment Amount”) at a price per share equal to 97.25%
of the market price of such shares in consideration of a commitment fee payable in cash or in shares of SPAC Class A Common Stock
to the Investor, as more fully set forth therein (the “Stock Purchase Agreement”).

The foregoing description of the Stock Purchase
Agreement and the Transactions contemplated by the Stock Purchase Agreement is not complete and is subject to, and qualified in its entirety
by reference to, the agreed upon form of Stock Purchase Agreement, a copy of which is filed with this Current Report on Form 8-K
as Exhibit 10.5 to this Current Report, and the terms of which are incorporated into this Current Report by reference.

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Item 3.02. Unregistered Sales of Equity Securities.

The disclosure set forth above in Item 1.01
of this Current Report on Form 8-K is incorporated by reference herein. The securities to be issued in connection with the
Business Combination Agreement and the Transactions will not be registered under the Securities Act, and issued in reliance on the
exemption from registration provided by Section 4(a)(2) of the Securities Act, and/or Regulation D and Regulation S
promulgated thereunder.

Item 5.02. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

Departure of Previous Directors

Effective August 21, 2025, Scott Glabe, Devin
Nunes and Michael Rosselli resigned from the Board. Their resignations were not a result of any disagreement with the Company.

Appointment of New Directors

Effective August 21, 2025, Owen May and
Ted McDonagh were appointed to the Board. In connection with their appointment to the Board, Messrs. May and McDonagh each entered
into indemnity agreements with the Company.

Other than the foregoing, Messrs. May and
McDonagh are not party to any