Business Description

NOTE 1 — ORGANIZATION AND BUSINESS OPERATIONS Dune Acquisition Corporation II (the “Company”) is a blank check company incorporated as a Cayman Islands exempted company on September 13, 2024. The Company was incorporated for the purpose of effecting a merger, amalgamation, share exchange, asset acquisition, share purchase, reorganization or similar business combination with one or more businesses (the “Business Combination”). The Company has not selected any specific Business Combination target and the Company has not, nor has anyone on its behalf, engaged in any substantive discussions, directly or indirectly, with any Business Combination target with respect to an initial Business Combination with the Company. As of December 31, 2025, the Company had not commenced any operations. All activity for the period from September 13, 2024 (inception) through December 31, 2025 relates to the Company’s formation, initial public offering (the “Initial Public Offering”), which is described below, and subsequent to the Initial Public Offering, identifying a target company for a Business Combination. The Company will not generate any operating revenues until after the completion of its initial Business Combination, at the earliest. The Company generates non-operating income on cash and cash equivalents in the form of interest income from the proceeds derived from the Initial Public Offering. The Company has selected December 31 as its fiscal year end. The Company’s Sponsor is Dune Acquisition Holdings II LLC (the “Sponsor”). The registration statement for the Company’s Initial Public Offering was declared effective on May 6, 2025. On May 8, 2025, the Company consummated the Initial Public Offering of 14,375,000 units (the “Units”), which includes the full exercise by the underwriters of their over-allotment option in the amount of 1,875,000 Units, at $10.00 per Unit, generating gross proceeds of $143,750,000. Each Unit consists of one Class A ordinary share (“Public Share”) and three-quarters of one redeemable warrant (“Public Warrant”). Each whole warrant entitles the holder to purchase one Class A ordinary share at a price of $11.50 per share. Simultaneously with the closing of the Initial Public Offering, the Company consummated the sale of 2,000,000 Private Placement Warrants (the “Private Placement Warrants”) to the Sponsor, at a price of $1.00 per warrant, generating gross proceeds of $2,000,000. The Company’s management has broad discretion with respect to the specific application of the net proceeds of the Initial Public Offering and the Private Placement Warrants, although substantially all of the net proceeds are intended to be generally applied toward consummating a Business Combination (less deferred underwriting commissions). Transaction costs amounted to $6,637,469, consisting of $550,000 of cash underwriting fees, $5,750,000 of deferred underwriting fees and $337,469 of other offering costs. The Company’s Business Combination must be with one or more target businesses that together have a fair market value equal to at least 80% of the net balance in the Trust Account (as defined below) (excluding the amount of deferred underwriting discounts held and taxes payable on the income earned on the Trust Account) at the time of the signing of an agreement to enter into a Business Combination. However, the Company will only complete a Business Combination if the post-Business Combination company owns or acquires 50% or more of the outstanding voting securities of the target or is otherwise not required to register as an investment company under the Investment Company Act of 1940, as amended (the “Investment Company Act”). There is no assurance that the Company will be able to successfully effect a Business Combination. Following the closing of the Initial Public Offering on May 8, 2025, an amount of $144,109,375 ($10.025 per Unit) from the net proceeds of the sale of the Units and the sale of the Private Placement Warrants was held in a Trust Account (the “Trust Account”) and initially will be invested only in U.S. government treasury obligations with a maturity of 185 days or less or in money market funds meeting certain conditions under Rule 2a-7 under the Investment Company Act, which invest only in direct U.S. government treasury obligations; the holding of these assets in this form is intended to be temporary and for the sole purpose of facilitating the intended Business Combination.…