Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2026

Summary of Significant Accounting Policies [Abstract]

The accompanying unaudited condensed financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and in accordance with the instructions to Form 10-Q and Article 8 of Regulation S-X of the SEC. Certain information or footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted, pursuant to the rules and regulations of the SEC for interim financial reporting. Accordingly, they do not include all the information and footnotes necessary for a complete presentation of financial position, results of operations, or cash flows. In the opinion of Management, the accompanying unaudited condensed financial statements include all adjustments, consisting of a normal recurring nature, which are necessary for a fair presentation of the financial position, operating results and cash flows for the periods presented.

The accompanying unaudited condensed financial statements should be read in conjunction with the Company’s 2025 Annual Report on Form 10-K filed with the SEC on March 9, 2026. The interim results for the three months ended March 31, 2026 are not necessarily indicative of the results to be expected for the year ending December 31, 2026 or for any future periods.

Emerging Growth Company Status

The Company is an “emerging growth company,” as defined in Section 2(a) of the Securities Act, as modified by the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), and it may take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not emerging growth companies including, but not limited to, not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act, reduced disclosure obligations regarding executive compensation in its periodic reports and proxy statements, and exemptions from the requirements of holding a nonbinding advisory vote on executive compensation and shareholder approval of any golden parachute payments not previously approved.

Further, Section 102(b)(1) of the JOBS Act exempts emerging growth companies from being required to comply with new or revised financial accounting standards until private companies (that is, those that have not had a Securities Act registration statement declared effective or do not have a class of securities registered under the Exchange Act) are required to comply with the new or revised financial accounting standards. The JOBS Act provides that a company can elect to opt out of the extended transition period and comply with the requirements that apply to non-emerging growth companies but any such election to opt out is irrevocable. The Company has elected not to opt out of such extended transition period which means that when a standard is issued or revised and it has different application dates for public or private companies, the Company, as an emerging growth company, can adopt the new or revised standard at the time private companies adopt the new or revised standard. This may make comparison of the Company’s financial statements with another public company which is neither an emerging growth company nor an emerging growth company which has opted out of using the extended transition period difficult or impossible because of the potential differences in accounting standards used.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires Management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements.

Making estimates requires Management to exercise significant judgment. It is at least reasonably possible that the estimate of the effect of a condition, situation or set of circumstances that existed at the date of the financial statements, which Management considered in formulating its estimate, could change in the near term due to one or more future confirming events. Accordingly, the actual results could differ significantly from those estimates.

Cash and Cash Equivalents

The Company considers all short-term investments with an original maturity of three months or less when purchased to be cash equivalents. As of March 31, 2026 and December 31, 2025, the Company had $691,167 and $864,584 in cash, respectively, and no cash equivalents.

Investments Held in Trust Account

As of March 31, 2026 and December 31, 2025, the assets held in the Trust Account, amounting to $261,495,780 and $259,241,061, respectively, were held in U.S. Treasury Bills. The Company accounts for its investments held in the Trust Account at fair value in the accompanying unaudited condensed balance sheets. Unrealized gains and losses resulting from the change in fair value of investments held in the Trust Account are included in interest earned on investments held in the Trust Account in the Company’s statements of operations.

Concentration of Credit Risk

Financial instruments that potentially subject the Company to concentrations of credit risk consist of a cash account in a financial institution, which, at times, may exceed the Federal Deposit Insurance Corporation coverage limit of $250,000. Any loss incurred or a lack of access to such funds could have a significant adverse impact on the Company’s financial condition, results of operations, and cash flows.

Offering Costs

The Company complies with the requirements of the ASC 340-10-S99 and SEC Staff Accounting Bulletin Topic 5A, “Expenses of Offering.” Offering costs consist principally of professional and registration fees that are related to the Initial Public Offering. FASB ASC 470-20, “Debt with Conversion and Other Options,” addresses the allocation of proceeds from the issuance of convertible debt into its equity and debt components. The Company applies this guidance to allocate Initial Public Offering proceeds from the Units between Class A Ordinary Shares and rights, using the residual method by allocating Initial Public Offering proceeds first to the assigned value of the rights and then to the Class A Ordinary Shares. Offering costs allocated to the Public Shares are charged to temporary equity, and offering costs allocated to the Public Rights and Private Placement Units are charged to shareholders’ deficit based on the equity classification of the underlying financial instruments.

Fair Value of Financial Instruments

The fair value of the Company’s assets and liabilities, which qualify as financial instruments under FASB ASC 820, “Fair Value Measurements and Disclosures,” approximates the carrying amounts represented in the balance sheet, primarily due to its short-term nature.

Income Taxes

The Company accounts for income taxes under ASC Topic 740, “Income Taxes,” which requires an asset and liability approach to financial accounting and reporting for income taxes. Deferred income tax assets and liabilities are computed for differences between the financial statement and tax bases of assets and liabilities that will result in future taxable or deductible amounts, based on enacted tax laws and rates applicable to the periods in which the differences are expected to affect taxable income. Valuation allowances are established, when necessary, to reduce deferred tax assets to the amount expected to be realized.

ASC Topic 740 prescribes a recognition threshold and a measurement attribute for the financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. For those benefits to be recognized, a tax position must be more likely than not to be sustained upon examination by taxing authorities. The Company’s Management determined that the Cayman Islands is the Company’s major tax jurisdiction. The Company recognizes accrued interest and penalties related to unrecognized tax benefits as income tax expense. As of March 31, 2026 and December 31, 2025, there were no unrecognized tax benefits and no amounts accrued for interest and penalties. The Company is currently not aware of any issues under review that could result in significant payments, accruals or material deviation from its position.

The Company is considered to be an exempted Cayman Islands company with no connection to any other taxable jurisdiction and is presently not subject to income taxes or income tax filing requirements in the Cayman Islands or the United States. As such, the Company’s tax provision was zero for the periods presented.

Rights

The Company accounted for the Public and Private Placement Rights (as defined below) issued in connection with the Initial Public Offering and the Private Placement in accordance with the guidance contained in FASB ASC Topic 815, “Derivatives and Hedging”. Accordingly, the Company evaluated and classified the rights under equity treatment at their assigned values.

On July 8, 2025, the Company announced that, commencing on July 11, 2025, the holders of the Units issued in its initial public offering, may elect to separately trade the Shares and Rights included in the Units. Any Units not separated will continue to trade on the Nasdaq Global Market under the symbol “OYSEU.” The Shares and the Rights are listed and trade on the Nasdaq Global Market under the symbols “OYSE” and “OYSER,” respectively.

Net Income (loss) per Ordinary Share

Net income (loss) per ordinary share is computed by dividing net income (loss) by the weighted average number of Ordinary Shares outstanding for the period. The calculation of diluted income (loss) per ordinary share does not consider the effect of the rights issued in connection with the (i) Initial Public Offering and (ii) exercise of the Over-Allotment Option.

The Company’s unaudited condensed statements of operations include a presentation of income (loss) per share for Ordinary Shares subject to possible redemption in a manner similar to the two-class method of income per share. Net income (loss) per Ordinary Share, basic and diluted, for Class A redeemable Ordinary Shares is calculated by dividing the interest income earned on the Trust Account by the weighted average number of Class A redeemable Ordinary Shares outstanding since original issuance. Net income (loss) per share, basic and diluted, for Class A and Class B non-redeemable Ordinary Shares is calculated by dividing net income (loss), adjusted for income (loss) attributable to Class A redeemable Ordinary Shares, by the weighted average number of Class A and Class B non-redeemable Ordinary Shares outstanding for the period. Class A and Class B non-redeemable Ordinary Shares include the Founder Shares, as these shares do not have any redemption features and do not participate in the income earned on the Trust Account.

The following table reflects the calculation of basic and diluted net income (loss) per Ordinary Share (in dollars, except per share amounts):

	For the Three Months Ended March 31,
	2026				2025
	Class A		Class B		Class A		Class B⁽¹⁾
Basic and diluted net income (loss) per share:
Numerator:
Allocation of net income (loss)	$	1,600,183	$	486,444	$	—	$	(25,100	)
Denominator:
Basic weighted-average shares outstanding		26,008,000		7,906,250		—		6,875,000
Basic and diluted net income (loss) per ordinary share	$	0.06	$	0.06	$	—	$	(0.00	)

⁽¹⁾

For the three months ended March 31, 2025, excluded 1,031,250 Class B Ordinary Shares that were subject to forfeiture to the extent the Over-Allotment Option was not exercised in full or in part by the underwriters (see Note 5).

Class A Shares Subject to Possible Redemption

The Public Shares contain a redemption feature which allows for the redemption of such Public Shares in connection with the Company’s liquidation, or if there is a shareholder vote or tender offer in connection with the Company’s initial Business Combination. In accordance with ASC 480-10-S99, the Company classifies Public Shares subject to redemption outside of permanent equity as the redemption provisions are not solely within the control of the Company. The Company recognizes changes in redemption value immediately as they occur and will adjust the carrying value of redeemable shares to equal the redemption value at the end of each reporting period. Immediately upon the closing of the Initial Public Offering, the Company recognized the accretion from initial book value to redemption value. The change in the carrying value of redeemable shares will result in charges against additional paid-in capital (to the extent available) and accumulated deficit. Accordingly, as of March 31, 2026 and December 31, 2025, Class A Ordinary Shares subject to possible redemption are presented at redemption value as temporary equity, outside of the shareholders’ deficit section of the Company’s balance sheet. As of March 31, 2026 and December 31, 2025, the Class A Ordinary Shares subject to possible redemption reflected in the balance sheets are reconciled in the following table:

Gross proceeds	$	253,000,000
Less:
Proceeds allocated to Public Rights		(3,744,400	)
Public Shares issuance costs		(14,298,405	)
Plus:
Remeasurement of carrying value to redemption value		24,283,866
Class A Ordinary Shares subject to possible redemption, December 31, 2025	$	259,241,061
Plus:
Remeasurement of carrying value to redemption value		2,254,719
Class A Ordinary Shares subject to possible redemption, March 31, 2026	$	261,495,780

Recent Accounting Pronouncements

Management does not believe that any recently issued, but not effective, accounting standards, if currently adopted, would have a material effect on the Company’s unaudited condensed financial statements.

Oyster Enterprises II Acquisition Corp 10-Q