DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS	1 Months Ended
Mar. 31, 2025
Accounting Policies [Abstract]
DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS	NOTE 1. DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS Perimeter Acquisition Corp. I (the “Company”) is a newly organized blank check company incorporated as a Cayman Islands exempted company and formed for the purpose of effecting a merger, amalgamation, share exchange, asset acquisition, share purchase, reorganization or similar business combination with one or more businesses or entities (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. The Company is an emerging growth company and, as such, the Company is subject to all of the risks associated with emerging growth companies. As of March 31, 2025, the Company had not commenced any operations. All activity for the period from March 6, 2025 (inception) through March 31, 2025 relates to the Company’s formation and the initial public offering (the “Initial Public Offering”), which is described below. The Company will not generate any operating revenues until after the completion of its initial Business Combination, at the earliest. The Company will generate non-operating income 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 registration statement for the Company’s Initial Public Offering was declared effective on May 12, 2025. On May 14, 2025, the Company consummated the Initial Public Offering of 24,150,000 units (the “Units” and, with respect to the Class A ordinary shares included in the Units being offered, the “Public Shares”), which includes the full exercise by the underwriters of their over-allotment option in the amount of 3,150,000 Units, at $10.00 per Unit, generating gross proceeds of $241,500,000. Each Unit consists of one Class A ordinary share 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 638,000 units (the “Private Placement Units”) at a price of $10.00 per Private Placement Unit, in a private placement to the Company’s sponsor, Perimeter Acquisition Sponsor LLC (the “Sponsor”), generating gross proceeds of $6,380,000. Each Private Placement Unit consists of one Class A ordinary share and one-half of one redeemable 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 $13,995,620, consisting of $4,347,000 of cash underwriting fee (net of $483,000 underwriters’ reimbursement), $8,452,500 of deferred underwriting fee, and $1,196,120 of other offering costs. The Company’s management has broad discretion with respect to the specific application of the net proceeds of the Initial Public Offering and the sale of Private Placement Units, although substantially all of the net proceeds are intended to be applied generally toward consummating a Business Combination (less deferred underwriting commissions). There is no assurance that the Company will be able to complete a Business Combination successfully. The Company must complete one or more initial Business Combinations having an aggregate fair market value of at least 80% of the assets held in the Trust Account (as defined below) (excluding any deferred underwriting fees and taxes payable on the income earned on the Trust Account) at the time of the signing of the agreement to enter into the initial Business Combination. However, the Company will only complete a Business Combination if the post-transaction company owns or acquires 50% or more of the outstanding voting securities of the target or otherwise acquires a controlling interest in the target sufficient for it not to be required to register as an investment company under the Investment Company Act of 1940, as amended (the “Investment Company Act”). Following the closing of the Initial Public Offering, on May 14, 2025, an amount of $241,500,000 ($10.00 per Unit) from the net proceeds of the sale of the Units and the Private Placement Units was placed in the trust account (the “Trust Account”), with Continental Stock Transfer & Trust Company acting as trustee. The funds are initially to be held in cash, including in demand deposit accounts at a bank, or invested only in United States “government securities” within the meaning of Section 2(a)(16) of the Investment Company Act having a maturity of 185 days or less or in money market funds meeting certain conditions under Rule 2a-7 promulgated under the Investment Company Act which invest only in direct U.S. government treasury obligations, until the earlier of: (i) the completion of a Business Combination and (ii) the distribution of the Trust Account as described below. The Company will provide the holders (the “Public Shareholders”) of Public Units, with the opportunity to redeem all or a portion of their Public Shares upon the completion of a Business Combination either (i) in connection with a shareholder meeting called to approve the Business Combination or (ii) by means of a tender offer. The decision as to whether the Company will seek shareholder approval of a Business Combination or conduct a tender offer will be made by the Company, solely in its discretion. The Public Shareholders will be entitled to redeem their Public Shares for a pro rata portion of the amount then in the Trust Account (initially valued at $10.00 per Public Share, plus any pro rata interest earned on the funds held in the Trust Account and not previously released to the Company for Permitted Withdrawals (as defined below). The per-share amount to be distributed to Public Shareholders who redeem their Public Shares will not be reduced by the deferred underwriting commissions the Company will pay to the underwriters (as discussed in Note 5). PERIMETER ACQUISITION CORP. I NOTES TO CONDENSED FINANCIAL STATEMENTS MARCH 31, 2025 (UNAUDITED) Upon the public announcement of the initial Business Combination, if the Company elects to conduct redemptions pursuant to the tender offer rules, the Company and the Sponsor will terminate any plan established in accordance with Rule 10b5-1 to purchase the Class A ordinary shares in the open market, in order to comply with Rule 14e-5 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). In the event the Company conducts redemptions pursuant to the tender offer rules, the offer to redeem will remain open for at least 20 business days, in accordance with Rule 14e-1(a) under the Exchange Act, and the Company will not be permitted to complete the initial Business Combination until the expiration of the tender offer period. In addition, the tender offer will be conditioned on public shareholders not tendering more than the number of public shares the Company is permitted to redeem. If public shareholders tender more shares than the Company has offered to purchase, the Company will withdraw the tender offer and not complete such initial Business Combination. Notwithstanding the foregoing, if the Company seeks shareholder approval of its Business Combination and does not conduct redemptions in connection with its Business Combination pursuant to the tender offer rules, the Amended and Restated Memorandum and Articles of Association will provide that a Public Shareholder, together with any affiliate of such shareholder or any other person with whom such shareholder is acting in concert or as a “group” (as defined under Section 13 of the Exchange Act), will be restricted from redeeming its Public Shares with respect to more than an aggregate of 15% of the Public Shares issued in the Initial Public Offering, without the prior consent of the Company. The Company’s Sponsor, officers and directors (the “initial shareholders”) have agreed not to propose an amendment to the Amended and Restated Memorandum and Articles of Association (a) that would modify the substance or timing of the Company’s obligation to provide holders of its Public Shares the right to have their shares redeemed in connection with a Business Combination or to redeem 100% of the Company’s Public Shares if the Company does not complete its Business Combination within 24 months from the closing of the Initial Public Offering (the “Combination Period”) or (b) with respect to any other material provisions relating to (x) the rights of Public Shareholders or (y) pre-initial Business Combination activity, unless the Company provides the Public Shareholders with the opportunity to redeem their Class A ordinary shares in connection with the implementation 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 earned on the funds held in the Trust Account (less Permitted Withdrawals), divided by the number of the then-outstanding Public Shares. If the Company has not completed a 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, subject to lawfully available funds, 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 and not previously released to the Company (less up to $100,000 of interest to pay dissolution expenses), divided by the number of the then-outstanding Public Shares, which redemption will completely extinguish Public Shareholders’ rights as shareholders (including the right to receive further liquidation 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 of directors, liquidate and dissolve, subject in each case to the Company’s obligations under Cayman Islands law to provide for claims of creditors and in all cases subject to the other requirements of other applicable law. The initial shareholders have agreed to waive their liquidation rights with respect to the Founder Shares (as defined in Note 4) and private placement shares included in the Private Placement Units held by them if the Company fails to complete a Business Combination within the Combination Period. However, if the initial shareholders acquire Public Shares in or after the Initial Public Offering, they will be entitled to liquidating distributions from the Trust Account with respect to such Public Shares if the Company fails to complete a Business Combination within the Combination Period. The underwriters have agreed to waive their rights to their deferred underwriting commission (see Note 5) 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 other funds held in the Trust Account that will be available to fund the redemption of the Public Shares. In the event of such distribution, it is possible that the per share value of the assets remaining available for distribution (including Trust Account assets) will be only $10.00 per share initially held in the Trust Account. In order to protect the amounts held in the Trust Account, the Sponsor has agreed to be liable to the Company if and to the extent any claims by a third party (excluding the Company’s independent registered public accounting firm) for services rendered or products sold to the Company, or a prospective target business with which the Company have entered into a written letter of intent, confidentially or other similar agreement or Business Combination agreement, reduce the amount of funds in the Trust Account to below the lesser of (i) $10.00 per Public Share and (ii) the actual amount per Public Share held in the Trust Account as of the date of the liquidation of the Trust Account if less than $10.00 per Public Share due to reductions in the value of the trust assets. This liability will not apply with respect to any claims by a third party who executed a waiver of any right, title, interest or claim of any kind in or to any monies held in the Trust Account or to any claims under the Company’s indemnity of the underwriters of the Initial Public Offering against certain liabilities, including liabilities under the Securities Act of 1933, as amended (the “Securities Act”). Moreover, in the event that an executed waiver is deemed to be unenforceable against a third party, the Sponsor will not be responsible to the extent of any liability for such third-party claims. The Sponsor has not made reserves for such indemnification obligations, nor has the Company independently verified whether the Sponsor has sufficient funds to satisfy its indemnity obligations and the Company believes that the Sponsor’s only assets are securities of the Company. Therefore, the Sponsor may not be able to satisfy those obligations. The Company will seek to reduce the possibility that the Sponsor will have to indemnify the Trust Account due to claims of creditors by endeavoring to have all vendors, service providers (excluding the Company’s independent registered public accounting firm), prospective target businesses or other entities with which the Company does business, execute agreements with the Company waiving any right, title, interest or claim of any kind in or to monies held in the Trust Account. PERIMETER ACQUISITION CORP. I NOTES TO CONDENSED FINANCIAL STATEMENTS MARCH 31, 2025 (UNAUDITED)

DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS

1 Months Ended

Mar. 31, 2025

DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS

NOTE 1. DESCRIPTION OF ORGANIZATION AND BUSINESS OPERATIONS

Perimeter Acquisition Corp. I (the “Company”) is a newly organized blank check company incorporated as a Cayman Islands exempted company and formed for the purpose of effecting a merger, amalgamation, share exchange, asset acquisition, share purchase, reorganization or similar business combination with one or more businesses or entities (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. The Company is an emerging growth company and, as such, the Company is subject to all of the risks associated with emerging growth companies.

As of March 31, 2025, the Company had not commenced any operations. All activity for the period from March 6, 2025 (inception) through March 31, 2025 relates to the Company’s formation and the initial public offering (the “Initial Public Offering”), which is described below. The Company will not generate any operating revenues until after the completion of its initial Business Combination, at the earliest. The Company will generate non-operating income 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 registration statement for the Company’s Initial Public Offering was declared effective on May 12, 2025. On May 14, 2025, the Company consummated the Initial Public Offering of 24,150,000 units (the “Units” and, with respect to the Class A ordinary shares included in the Units being offered, the “Public Shares”), which includes the full exercise by the underwriters of their over-allotment option in the amount of 3,150,000 Units, at $10.00 per Unit, generating gross proceeds of $241,500,000. Each Unit consists of one Class A ordinary share 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 638,000 units (the “Private Placement Units”) at a price of $10.00 per Private Placement Unit, in a private placement to the Company’s sponsor, Perimeter Acquisition Sponsor LLC (the “Sponsor”), generating gross proceeds of $6,380,000. Each Private Placement Unit consists of one Class A ordinary share and one-half of one redeemable 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 $13,995,620, consisting of $4,347,000 of cash underwriting fee (net of $483,000 underwriters’ reimbursement), $8,452,500 of deferred underwriting fee, and $1,196,120 of other offering costs.

The Company’s management has broad discretion with respect to the specific application of the net proceeds of the Initial Public Offering and the sale of Private Placement Units, although substantially all of the net proceeds are intended to be applied generally toward consummating a Business Combination (less deferred underwriting commissions). There is no assurance that the Company will be able to complete a Business Combination successfully. The Company must complete one or more initial Business Combinations having an aggregate fair market value of at least 80% of the assets held in the Trust Account (as defined below) (excluding any deferred underwriting fees and taxes payable on the income earned on the Trust Account) at the time of the signing of the agreement to enter into the initial Business Combination. However, the Company will only complete a Business Combination if the post-transaction company owns or acquires 50% or more of the outstanding voting securities of the target or otherwise acquires a controlling interest in the target sufficient for it not to be required to register as an investment company under the Investment Company Act of 1940, as amended (the “Investment Company Act”).

Following the closing of the Initial Public Offering, on May 14, 2025, an amount of $241,500,000 ($10.00 per Unit) from the net proceeds of the sale of the Units and the Private Placement Units was placed in the trust account (the “Trust Account”), with Continental Stock Transfer & Trust Company acting as trustee. The funds are initially to be held in cash, including in demand deposit accounts at a bank, or invested only in United States “government securities” within the meaning of Section 2(a)(16) of the Investment Company Act having a maturity of 185 days or less or in money market funds meeting certain conditions under Rule 2a-7 promulgated under the Investment Company Act which invest only in direct U.S. government treasury obligations, until the earlier of: (i) the completion of a Business Combination and (ii) the distribution of the Trust Account as described below.

The Company will provide the holders (the “Public Shareholders”) of Public Units, with the opportunity to redeem all or a portion of their Public Shares upon the completion of a Business Combination either (i) in connection with a shareholder meeting called to approve the Business Combination or (ii) by means of a tender offer. The decision as to whether the Company will seek shareholder approval of a Business Combination or conduct a tender offer will be made by the Company, solely in its discretion. The Public Shareholders will be entitled to redeem their Public Shares for a pro rata portion of the amount then in the Trust Account (initially valued at $10.00 per Public Share, plus any pro rata interest earned on the funds held in the Trust Account and not previously released to the Company for Permitted Withdrawals (as defined below). The per-share amount to be distributed to Public Shareholders who redeem their Public Shares will not be reduced by the deferred underwriting commissions the Company will pay to the underwriters (as discussed in Note 5).

PERIMETER ACQUISITION CORP. I

NOTES TO CONDENSED FINANCIAL STATEMENTS

MARCH 31, 2025

(UNAUDITED)

Upon the public announcement of the initial Business Combination, if the Company elects to conduct redemptions pursuant to the tender offer rules, the Company and the Sponsor will terminate any plan established in accordance with Rule 10b5-1 to purchase the Class A ordinary shares in the open market, in order to comply with Rule 14e-5 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). In the event the Company conducts redemptions pursuant to the tender offer rules, the offer to redeem will remain open for at least 20 business days, in accordance with Rule 14e-1(a) under the Exchange Act, and the Company will not be permitted to complete the initial Business Combination until the expiration of the tender offer period. In addition, the tender offer will be conditioned on public shareholders not tendering more than the number of public shares the Company is permitted to redeem. If public shareholders tender more shares than the Company has offered to purchase, the Company will withdraw the tender offer and not complete such initial Business Combination.

Notwithstanding the foregoing, if the Company seeks shareholder approval of its Business Combination and does not conduct redemptions in connection with its Business Combination pursuant to the tender offer rules, the Amended and Restated Memorandum and Articles of Association will provide that a Public Shareholder, together with any affiliate of such shareholder or any other person with whom such shareholder is acting in concert or as a “group” (as defined under Section 13 of the Exchange Act), will be restricted from redeeming its Public Shares with respect to more than an aggregate of 15% of the Public Shares issued in the Initial Public Offering, without the prior consent of the Company.

The Company’s Sponsor, officers and directors (the “initial shareholders”) have agreed not to propose an amendment to the Amended and Restated Memorandum and Articles of Association (a) that would modify the substance or timing of the Company’s obligation to provide holders of its Public Shares the right to have their shares redeemed in connection with a Business Combination or to redeem 100% of the Company’s Public Shares if the Company does not complete its Business Combination within 24 months from the closing of the Initial Public Offering (the “Combination Period”) or (b) with respect to any other material provisions relating to (x) the rights of Public Shareholders or (y) pre-initial Business Combination activity, unless the Company provides the Public Shareholders with the opportunity to redeem their Class A ordinary shares in connection with the implementation 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 earned on the funds held in the Trust Account (less Permitted Withdrawals), divided by the number of the then-outstanding Public Shares.

If the Company has not completed a 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, subject to lawfully available funds, 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 and not previously released to the Company (less up to $100,000 of interest to pay dissolution expenses), divided by the number of the then-outstanding Public Shares, which redemption will completely extinguish Public Shareholders’ rights as shareholders (including the right to receive further liquidation 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 of directors, liquidate and dissolve, subject in each case to the Company’s obligations under Cayman Islands law to provide for claims of creditors and in all cases subject to the other requirements of other applicable law.

The initial shareholders have agreed to waive their liquidation rights with respect to the Founder Shares (as defined in Note 4) and private placement shares included in the Private Placement Units held by them if the Company fails to complete a Business Combination within the Combination Period. However, if the initial shareholders acquire Public Shares in or after the Initial Public Offering, they will be entitled to liquidating distributions from the Trust Account with respect to such Public Shares if the Company fails to complete a Business Combination within the Combination Period. The underwriters have agreed to waive their rights to their deferred underwriting commission (see Note 5) 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 other funds held in the Trust Account that will be available to fund the redemption of the Public Shares.

In the event of such distribution, it is possible that the per share value of the assets remaining available for distribution (including Trust Account assets) will be only $10.00 per share initially held in the Trust Account. In order to protect the amounts held in the Trust Account, the Sponsor has agreed to be liable to the Company if and to the extent any claims by a third party (excluding the Company’s independent registered public accounting firm) for services rendered or products sold to the Company, or a prospective target business with which the Company have entered into a written letter of intent, confidentially or other similar agreement or Business Combination agreement, reduce the amount of funds in the Trust Account to below the lesser of (i) $10.00 per Public Share and (ii) the actual amount per Public Share held in the Trust Account as of the date of the liquidation of the Trust Account if less than $10.00 per Public Share due to reductions in the value of the trust assets. This liability will not apply with respect to any claims by a third party who executed a waiver of any right, title, interest or claim of any kind in or to any monies held in the Trust Account or to any claims under the Company’s indemnity of the underwriters of the Initial Public Offering against certain liabilities, including liabilities under the Securities Act of 1933, as amended (the “Securities Act”).

Moreover, in the event that an executed waiver is deemed to be unenforceable against a third party, the Sponsor will not be responsible to the extent of any liability for such third-party claims. The Sponsor has not made reserves for such indemnification obligations, nor has the Company independently verified whether the Sponsor has sufficient funds to satisfy its indemnity obligations and the Company believes that the Sponsor’s only assets are securities of the Company. Therefore, the Sponsor may not be able to satisfy those obligations. The Company will seek to reduce the possibility that the Sponsor will have to indemnify the Trust Account due to claims of creditors by endeavoring to have all vendors, service providers (excluding the Company’s independent registered public accounting firm), prospective target businesses or other entities with which the Company does business, execute agreements with the Company waiving any right, title, interest or claim of any kind in or to monies held in the Trust Account.

PERIMETER ACQUISITION CORP. I

NOTES TO CONDENSED FINANCIAL STATEMENTS

MARCH 31, 2025

(UNAUDITED)