Description of Organization and Business Operations	6 Months Ended
Jun. 30, 2026
Description of Organization and Business Operations [Abstract]
DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS	NOTE 1. DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS Organization and General Newbury Street II Acquisition Corp (the “Company”) was incorporated as a Cayman Islands exempted company on June 18, 2024. The Company was incorporated for the purpose of effecting a merger, share exchange, asset acquisition, share purchase, reorganization or similar business combination with one or more businesses (the “Business Combination”). The Company is an “emerging growth company,” as defined in Section 2(a) of the Securities Act of 1933, as amended (the “Securities Act”), as modified by the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”). As of June 30, 2026, the Company had not entered into a definitive agreement with any specific Business Combination target. As of June 30, 2026, the Company had not yet commenced operations. All activity for the period from June 18, 2024 (inception) through June 30, 2026 related to the Company’s formation and the Initial Public Offering (as defined below), and subsequent to the Initial Public Offering, identifying and evaluating prospective acquisition candidates and activities in connection with the Business Combination. The Company will not generate any operating revenue until after the completion of its initial Business Combination, at the earliest. The Company generates non-operating income in the form of interest income from the proceeds derived from the Initial Public Offering, which are held in the Trust Account (as defined below). The Company has selected December 31 as its fiscal year end. Sponsor and Initial Financing The Company’s sponsor is Newbury Street II Acquisition Sponsor LLC (the “Sponsor”). The Registration Statement on Form S-1 for the Initial Public Offering, initially filed with the U.S. Securities and Exchange Commission (the “SEC”) on August 9, 2024 (File No. 333-281456), was declared effective on October 31, 2024 (as amended, the “IPO Registration Statement”). On November 4, 2024, the Company consummated the initial public offering of 17,250,000 units (the “Public Units”), which included the full exercise of the Over-Allotment Option (as defined in Note 6) in the amount of 2,250,000 Public Units (the “Option Units”), at $10.00 per Public Unit, generating gross proceeds of $172,500,000 (the “Initial Public Offering”), which is described in Note 3. Each Public Unit consists of one Class A ordinary share, par value $0.0001 per share, of the Company (the “Class A Ordinary Shares” and, with respect to the Class A Ordinary Shares included in the Public Units, the “Public Shares”) and one-half of one redeemable warrant (each, a “Public Warrant”). Simultaneously with the closing of the Initial Public Offering, the Company consummated the sale of an aggregate of 648,375 units (the “Private Placement Units” and, together with the Public Units, the “Units”) at a price of $10.00 per Private Placement Unit in a private placement to (i) the Sponsor and (ii) BTIG, LLC (“BTIG”), the underwriter in the Initial Public Offering, in a private placement, generating gross proceeds of $6,483,750 (the “Private Placement”), which is described in Note 4. Of those 648,375 Private Placement Units, the Sponsor purchased 484,500 Private Placement Units and BTIG purchased 163,875 Private Placement Units. Each Private Placement Unit consists of one Class A Ordinary Share (the “Private Placement Shares”) and one-half of one warrant (the “Private Placement Warrants”, and together with the Public Warrants, the “Warrants”). Each whole Warrant entitles the holder to purchase one Class A Ordinary Share at a price of $11.50 per share, subject to adjustment. Transaction costs amounted to $10,113,129, consisting of $3,450,000 of cash underwriting fee, the Deferred Fee (as defined in Note 6) of $6,037,500, and $625,629 of other offering costs. The Trust Account Following the closing of the Initial Public Offering, on November 4, 2024, the amount of $173,362,500 ($10.05 per Public Unit) from the net proceeds of the Initial Public Offering and the Private Placement was placed in a trust account (the “Trust Account”), with Continental Stock Transfer & Trust Company (“Continental”), acting as trustee. The funds in the Trust Account are held only in (i) U.S. Department of the Treasury (the “Treasury”) bills with a maturity of 185 days or less or in money market funds investing solely in Treasury obligations, (ii) uninvested cash, or (iii) an interest-bearing bank demand deposit account or other accounts at a bank that meet certain conditions under Rule 2a-7 under the Investment Company Act of 1940, as amended (the “Investment Company Act”). The funds will remain in the Trust Account until the earlier of (x) the consummation of the initial Business Combination or (y) the distribution of the Trust Account proceeds as described below. As of the accompanying condensed balance sheet date, these funds were held in money market accounts. Initial Business Combination The Company’s management (“Management”) has broad discretion with respect to the specific application of the net proceeds of the Initial Public Offering, although substantially all of the net proceeds of the Initial Public Offering are intended to be generally applied toward consummating a Business Combination. The initial Business Combination must occur with one or more target businesses that together have an aggregate fair market value of at least 80% of the assets held in the Trust Account (excluding the Deferred Fee and taxes payable, if any, on income earned on the Trust Account) at the time of the agreement to enter into the Business Combination. Furthermore, there is no assurance that the Company will be able to successfully consummate a Business Combination. The Company will provide the holders of Public Shares (the “Public Shareholders”) with the opportunity to redeem, regardless of whether they abstain, vote for, or against, the initial Business Combination, all or a portion of their Public Shares upon the completion of the initial Business Combination either (i) in connection with a general meeting called to approve the initial Business Combination or (ii) by means of a tender offer. The decision as to whether the Company will seek shareholder approval of a proposed Business Combination or conduct a tender offer will be made by the Company, solely in its discretion, and will be based on a variety of factors such as the timing of the transaction and whether the terms of the transaction would require the Company to seek shareholder approval under applicable law or stock exchange listing requirement. Asset acquisitions and share purchases would not typically require shareholder approval while direct mergers with the Company where it does not survive and any transactions where the Company issues more than 20% of the issued and outstanding Ordinary Shares (as defined in Note 5) or seek to amend the Company’s amended and restated memorandum and articles of association (as currently in effect, the “Amended and Restated Articles”) would typically require shareholder approval. The Company intends to conduct redemptions without a shareholder vote pursuant to the tender offer rules of the SEC unless shareholder approval is required by applicable law or stock exchange listing rules, or the Company chooses to seek shareholder approval for business or other reasons. The Amended and Restated Articles provides that the Company has until November 4, 2026, or such earlier liquidation date as the Company’s board of directors (the “Board”) may approve to consummate the initial Business Combination (the “Combination Period”). If the Company is unable to complete the initial Business Combination within the Combination Period, the Company will (i) cease all operations except for the purpose of winding up, (ii) as promptly as reasonably possible but not more than ten business days thereafter (and subject to lawfully available funds therefor), redeem the Public Shares, at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest earned on the funds held in the Trust Account (less up to $100,000 of interest to pay dissolution expenses and net of taxes payable, if any), divided by the number of then-outstanding Public Shares, which redemption will completely extinguish Public Shareholders’ rights as shareholders (including the right to receive further liquidating distributions, if any), subject to applicable law, and (iii) as promptly as reasonably possible following such redemption, subject to the approval of the remaining shareholders and the Board, liquidate and dissolve, subject in each case to the Company’s obligations under Cayman Islands law to provide for claims of creditors and the requirements of other applicable law. There will be no redemption rights or liquidating distributions with respect to the Warrants, which will expire without value to the holder if the Company fails to complete the initial Business Combination within the Combination Period. The Sponsor, and the Company’s executive officers and directors have entered into a letter agreement with the Company, dated October 31, 2024 (the “Letter Agreement”), pursuant to which they have waived their rights to liquidating distributions from the Trust Account with respect to their Founder Shares (as defined in Note 5) and Private Placement Shares if the Company fails to complete the initial Business Combination within the Combination Period. However, if the Sponsor and the Company’s executive officers and directors acquire Public Shares, they will be entitled to liquidating distributions from the Trust Account with respect to such Public Shares if the Company fails to complete the initial Business Combination within the Combination Period. BTIG has agreed to waive its rights to the Deferred Fee held in the Trust Account in the event the Company does not complete a Business Combination within the Combination Period and, in such event, such amounts will be included with the funds held in the Trust Account that will be available to fund the redemption of the Public Shares. The Sponsor, and the Company’s executive officers and directors have also agreed, pursuant to the Letter Agreement, that they will not propose any amendment to the Amended and Restated Articles (i) that would modify the substance or timing of the obligation to allow redemptions in connection with the initial Business Combination or to redeem 100% of the Public Shares if the Company does not complete the initial Business Combination within the Combination Period or (ii) with respect to any other material provisions relating to shareholders’ rights or pre-initial Business Combination activity, in each case unless the Company provides the Public Shareholders with the opportunity to redeem their Public Shares upon approval of any such amendment at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest (which interest shall be net of taxes payable, if any), divided by the number of then issued and outstanding Public Shares. Board and Audit Committee Changes On May 28, 2025, Matthew Hong notified the Board of his resignation as a member and chairman of the Board and a member and chair of the audit committee of the Board (the “Audit Committee”), effective as of the same day. On May 28, 2025, the Board appointed Anthony James Vinciquerra and William Zachre Wyatt as directors of the Board (the “New Directors”). Effective as of May 28, 2025, Mr. Vinciquerra was appointed as chairman of the Board, Ted Seides, a director of the Company, was appointed as a member of the Audit Committee, and Josh Gold, a director and member of the Audit Committee, was appointed as chair of the Audit Committee. The New Directors serve as Class III Directors of the Board, whose term will expire at the Company’s third annual general meeting. In connection with the appointments, the New Directors signed a joinder to the Letter Agreement, pursuant to which, among other things, the signatories agreed to waive certain redemption rights and to vote any Ordinary Shares they hold in favor of an initial Business Combination. The New Directors also entered into a standard director indemnity agreement with the Company. Each of the New Directors will also receive membership interests in the Sponsor representing ownership of certain Class B Ordinary Shares solely upon consummation of the Business Combination with a target introduced by such director. Risks and Uncertainties The Company’s ability to complete an initial Business Combination may be adversely affected by various factors, many of which are beyond the Company’s control. The Company’s ability to consummate an initial Business Combination could be impacted by, among other things, changes in laws or regulations, downturns in the financial markets or in economic conditions, inflation, fluctuations in interest rates, increases in tariffs, supply chain disruptions, declines in consumer confidence and spending, public health considerations, and geopolitical instability, such as the military conflicts in Ukraine, between the United States, Israel and Iran and others in the Middle East, and Southwest Asia or other armed hostilities. The Company cannot at this time predict the likelihood of one or more of the above events, their duration or magnitude or the extent to which they may negatively impact the Company’s ability to complete an initial Business Combination. Liquidity, Capital Resources and Going Concern The Company has a mandatory liquidation date of November 4, 2026, the end of the Combination Period, at which time it will cease all operations except for the purpose of winding up, redeeming public shares, and liquidating. As of June 30, 2026, the Company had working capital deficit of $(776,222) and $396,294 of cash held outside the Trust Account available to fund ongoing operating expenses. The Company may need to raise additional capital through loans from its Sponsor or an affiliate of the Sponsor, or the Company’s officers and directors. The Sponsor or an affiliate of the Sponsor, or the Company’s officers and directors, may, but are not obligated to, loan the Company funds as may be required to finance transaction costs in connection with the Company’s initial Business Combination (the “Working Capital Loans”). Accordingly, the Company may not be able to obtain additional financing when needed. If the Company is unable to raise additional capital, it may be required to take additional measures to conserve liquidity, which could include, but not necessarily be limited to, curtailing operations, suspending the pursuit of a potential transaction, and reducing overhead expenses. The Company cannot provide any assurance that additional financing will be available to it on commercially acceptable terms, if at all. In accordance with the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 205-40, “Presentation of Financial Statements – Going Concern,” Management has determined that the liquidity condition and mandatory liquidation, should a Business Combination not occur, raise substantial doubt about the Company’s ability to continue as a going concern for a period of time within one year after the date that the accompanying unaudited condensed financial statements are issued. The accompanying unaudited condensed financial statements do not include any adjustments that might result from the outcome of this uncertainty.

Description of Organization and Business Operations

6 Months Ended

Jun. 30, 2026

Description of Organization and Business Operations [Abstract]

DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS

NOTE 1. DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS

Organization and General

Newbury Street II Acquisition Corp (the “Company”) was incorporated as a Cayman Islands exempted company on June 18, 2024. The Company was incorporated for the purpose of effecting a merger, share exchange, asset acquisition, share purchase, reorganization or similar business combination with one or more businesses (the “Business Combination”). The Company is an “emerging growth company,” as defined in Section 2(a) of the Securities Act of 1933, as amended (the “Securities Act”), as modified by the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”). As of June 30, 2026, the Company had not entered into a definitive agreement with any specific Business Combination target.

As of June 30, 2026, the Company had not yet commenced operations. All activity for the period from June 18, 2024 (inception) through June 30, 2026 related to the Company’s formation and the Initial Public Offering (as defined below), and subsequent to the Initial Public Offering, identifying and evaluating prospective acquisition candidates and activities in connection with the Business Combination. The Company will not generate any operating revenue until after the completion of its initial Business Combination, at the earliest. The Company generates non-operating income in the form of interest income from the proceeds derived from the Initial Public Offering, which are held in the Trust Account (as defined below). The Company has selected December 31 as its fiscal year end.

Sponsor and Initial Financing

The Company’s sponsor is Newbury Street II Acquisition Sponsor LLC (the “Sponsor”). The Registration Statement on Form S-1 for the Initial Public Offering, initially filed with the U.S. Securities and Exchange Commission (the “SEC”) on August 9, 2024 (File No. 333-281456), was declared effective on October 31, 2024 (as amended, the “IPO Registration Statement”). On November 4, 2024, the Company consummated the initial public offering of 17,250,000 units (the “Public Units”), which included the full exercise of the Over-Allotment Option (as defined in Note 6) in the amount of 2,250,000 Public Units (the “Option Units”), at $10.00 per Public Unit, generating gross proceeds of $172,500,000 (the “Initial Public Offering”), which is described in Note 3. Each Public Unit consists of one Class A ordinary share, par value $0.0001 per share, of the Company (the “Class A Ordinary Shares” and, with respect to the Class A Ordinary Shares included in the Public Units, the “Public Shares”) and one-half of one redeemable warrant (each, a “Public Warrant”).

Simultaneously with the closing of the Initial Public Offering, the Company consummated the sale of an aggregate of 648,375 units (the “Private Placement Units” and, together with the Public Units, the “Units”) at a price of $10.00 per Private Placement Unit in a private placement to (i) the Sponsor and (ii) BTIG, LLC (“BTIG”), the underwriter in the Initial Public Offering, in a private placement, generating gross proceeds of $6,483,750 (the “Private Placement”), which is described in Note 4. Of those 648,375 Private Placement Units, the Sponsor purchased 484,500 Private Placement Units and BTIG purchased 163,875 Private Placement Units. Each Private Placement Unit consists of one Class A Ordinary Share (the “Private Placement Shares”) and one-half of one warrant (the “Private Placement Warrants”, and together with the Public Warrants, the “Warrants”). Each whole Warrant entitles the holder to purchase one Class A Ordinary Share at a price of $11.50 per share, subject to adjustment.

Transaction costs amounted to $10,113,129, consisting of $3,450,000 of cash underwriting fee, the Deferred Fee (as defined in Note 6) of $6,037,500, and $625,629 of other offering costs.

The Trust Account

Following the closing of the Initial Public Offering, on November 4, 2024, the amount of $173,362,500 ($10.05 per Public Unit) from the net proceeds of the Initial Public Offering and the Private Placement was placed in a trust account (the “Trust Account”), with Continental Stock Transfer & Trust Company (“Continental”), acting as trustee. The funds in the Trust Account are held only in (i) U.S. Department of the Treasury (the “Treasury”) bills with a maturity of 185 days or less or in money market funds investing solely in Treasury obligations, (ii) uninvested cash, or (iii) an interest-bearing bank demand deposit account or other accounts at a bank that meet certain conditions under Rule 2a-7 under the Investment Company Act of 1940, as amended (the “Investment Company Act”). The funds will remain in the Trust Account until the earlier of (x) the consummation of the initial Business Combination or (y) the distribution of the Trust Account proceeds as described below. As of the accompanying condensed balance sheet date, these funds were held in money market accounts.

Initial Business Combination

The Company’s management (“Management”) has broad discretion with respect to the specific application of the net proceeds of the Initial Public Offering, although substantially all of the net proceeds of the Initial Public Offering are intended to be generally applied toward consummating a Business Combination. The initial Business Combination must occur with one or more target businesses that together have an aggregate fair market value of at least 80% of the assets held in the Trust Account (excluding the Deferred Fee and taxes payable, if any, on income earned on the Trust Account) at the time of the agreement to enter into the Business Combination. Furthermore, there is no assurance that the Company will be able to successfully consummate a Business Combination.

The Company will provide the holders of Public Shares (the “Public Shareholders”) with the opportunity to redeem, regardless of whether they abstain, vote for, or against, the initial Business Combination, all or a portion of their Public Shares upon the completion of the initial Business Combination either (i) in connection with a general meeting called to approve the initial Business Combination or (ii) by means of a tender offer. The decision as to whether the Company will seek shareholder approval of a proposed Business Combination or conduct a tender offer will be made by the Company, solely in its discretion, and will be based on a variety of factors such as the timing of the transaction and whether the terms of the transaction would require the Company to seek shareholder approval under applicable law or stock exchange listing requirement. Asset acquisitions and share purchases would not typically require shareholder approval while direct mergers with the Company where it does not survive and any transactions where the Company issues more than 20% of the issued and outstanding Ordinary Shares (as defined in Note 5) or seek to amend the Company’s amended and restated memorandum and articles of association (as currently in effect, the “Amended and Restated Articles”) would typically require shareholder approval. The Company intends to conduct redemptions without a shareholder vote pursuant to the tender offer rules of the SEC unless shareholder approval is required by applicable law or stock exchange listing rules, or the Company chooses to seek shareholder approval for business or other reasons.

The Amended and Restated Articles provides that the Company has until November 4, 2026, or such earlier liquidation date as the Company’s board of directors (the “Board”) may approve to consummate the initial Business Combination (the “Combination Period”). If the Company is unable to complete the initial Business Combination within the Combination Period, the Company will (i) cease all operations except for the purpose of winding up, (ii) as promptly as reasonably possible but not more than ten business days thereafter (and subject to lawfully available funds therefor), redeem the Public Shares, at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest earned on the funds held in the Trust Account (less up to $100,000 of interest to pay dissolution expenses and net of taxes payable, if any), divided by the number of then-outstanding Public Shares, which redemption will completely extinguish Public Shareholders’ rights as shareholders (including the right to receive further liquidating distributions, if any), subject to applicable law, and (iii) as promptly as reasonably possible following such redemption, subject to the approval of the remaining shareholders and the Board, liquidate and dissolve, subject in each case to the Company’s obligations under Cayman Islands law to provide for claims of creditors and the requirements of other applicable law. There will be no redemption rights or liquidating distributions with respect to the Warrants, which will expire without value to the holder if the Company fails to complete the initial Business Combination within the Combination Period.

The Sponsor, and the Company’s executive officers and directors have entered into a letter agreement with the Company, dated October 31, 2024 (the “Letter Agreement”), pursuant to which they have waived their rights to liquidating distributions from the Trust Account with respect to their Founder Shares (as defined in Note 5) and Private Placement Shares if the Company fails to complete the initial Business Combination within the Combination Period. However, if the Sponsor and the Company’s executive officers and directors acquire Public Shares, they will be entitled to liquidating distributions from the Trust Account with respect to such Public Shares if the Company fails to complete the initial Business Combination within the Combination Period. BTIG has agreed to waive its rights to the Deferred Fee held in the Trust Account in the event the Company does not complete a Business Combination within the Combination Period and, in such event, such amounts will be included with the funds held in the Trust Account that will be available to fund the redemption of the Public Shares.

The Sponsor, and the Company’s executive officers and directors have also agreed, pursuant to the Letter Agreement, that they will not propose any amendment to the Amended and Restated Articles (i) that would modify the substance or timing of the obligation to allow redemptions in connection with the initial Business Combination or to redeem 100% of the Public Shares if the Company does not complete the initial Business Combination within the Combination Period or (ii) with respect to any other material provisions relating to shareholders’ rights or pre-initial Business Combination activity, in each case unless the Company provides the Public Shareholders with the opportunity to redeem their Public Shares upon approval of any such amendment at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest (which interest shall be net of taxes payable, if any), divided by the number of then issued and outstanding Public Shares.

Board and Audit Committee Changes

On May 28, 2025, Matthew Hong notified the Board of his resignation as a member and chairman of the Board and a member and chair of the audit committee of the Board (the “Audit Committee”), effective as of the same day.

On May 28, 2025, the Board appointed Anthony James Vinciquerra and William Zachre Wyatt as directors of the Board (the “New Directors”). Effective as of May 28, 2025, Mr. Vinciquerra was appointed as chairman of the Board, Ted Seides, a director of the Company, was appointed as a member of the Audit Committee, and Josh Gold, a director and member of the Audit Committee, was appointed as chair of the Audit Committee. The New Directors serve as Class III Directors of the Board, whose term will expire at the Company’s third annual general meeting.

In connection with the appointments, the New Directors signed a joinder to the Letter Agreement, pursuant to which, among other things, the signatories agreed to waive certain redemption rights and to vote any Ordinary Shares they hold in favor of an initial Business Combination. The New Directors also entered into a standard director indemnity agreement with the Company. Each of the New Directors will also receive membership interests in the Sponsor representing ownership of certain Class B Ordinary Shares solely upon consummation of the Business Combination with a target introduced by such director.

Risks and Uncertainties

The Company’s ability to complete an initial Business Combination may be adversely affected by various factors, many of which are beyond the Company’s control. The Company’s ability to consummate an initial Business Combination could be impacted by, among other things, changes in laws or regulations, downturns in the financial markets or in economic conditions, inflation, fluctuations in interest rates, increases in tariffs, supply chain disruptions, declines in consumer confidence and spending, public health considerations, and geopolitical instability, such as the military conflicts in Ukraine, between the United States, Israel and Iran and others in the Middle East, and Southwest Asia or other armed hostilities. The Company cannot at this time predict the likelihood of one or more of the above events, their duration or magnitude or the extent to which they may negatively impact the Company’s ability to complete an initial Business Combination.

Liquidity, Capital Resources and Going Concern

The Company has a mandatory liquidation date of November 4, 2026, the end of the Combination Period, at which time it will cease all operations except for the purpose of winding up, redeeming public shares, and liquidating. As of June 30, 2026, the Company had working capital deficit of $(776,222) and $396,294 of cash held outside the Trust Account available to fund ongoing operating expenses.

The Company may need to raise additional capital through loans from its Sponsor or an affiliate of the Sponsor, or the Company’s officers and directors. The Sponsor or an affiliate of the Sponsor, or the Company’s officers and directors, may, but are not obligated to, loan the Company funds as may be required to finance transaction costs in connection with the Company’s initial Business Combination (the “Working Capital Loans”). Accordingly, the Company may not be able to obtain additional financing when needed. If the Company is unable to raise additional capital, it may be required to take additional measures to conserve liquidity, which could include, but not necessarily be limited to, curtailing operations, suspending the pursuit of a potential transaction, and reducing overhead expenses. The Company cannot provide any assurance that additional financing will be available to it on commercially acceptable terms, if at all.

In accordance with the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 205-40, “Presentation of Financial Statements – Going Concern,” Management has determined that the liquidity condition and mandatory liquidation, should a Business Combination not occur, raise substantial doubt about the Company’s ability to continue as a going concern for a period of time within one year after the date that the accompanying unaudited condensed financial statements are issued.

The accompanying unaudited condensed financial statements do not include any adjustments that might result from the outcome of this uncertainty.