Sec Form 3 Filing - Perimeter Acquisition Sponsor LLC @ Perimeter Acquisition Corp. I - 2025-05-12

FORM 3 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Perimeter Acquisition Sponsor LLC 2. Issuer Name and Ticker or Trading Symbol Perimeter Acquisition Corp. I [ PMTR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 6060 N. CENTRAL EXPRESS WAY, SUITE 500 3. Date of Earliest Transaction (MM/DD/YY) 05/12/2025 (Street) DALLAS, TX75204 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class A ordinary shares ( 2 ) 575,000 D ( 1 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Class B ordinary shares ( 3 ) ( 3 ) ( 3 ) Class A ordinary shares 5,911,500 ( 4 ) D ( 1 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Perimeter Acquisition Sponsor LLC 6060 N. CENTRAL EXPRESS WAY, SUITE 500 DALLAS, TX75204 X Signatures /s/ Jordan Blashek, Managing Member of Perimeter Acquisition Sponsor LLC 05/12/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This Form 3 is being filed by Perimeter Acquisition Sponsor LLC (the "Sponsor"). The Sponsor is controlled by Mr. Jordan Blashek, as a result of his role as managing member of the Sponsor. As a result, Mr. Blashek may be deemed to have beneficial ownership of the Class B ordinary shares and the Private Placement Units (as defined below) (including the Private Placement Shares (as defined below) included in such units) held by the Sponsor. Mr. Blashek disclaims such beneficial ownership except to the extent of the Sponsor's pecuniary interest therein. ( 2 )Represents Class A ordinary shares, par value $0.0001, of the issuer (the "Private Placement Shares") that are included in the 575,000 private placement units (the "Private Placement Units") that will be purchased by the Sponsor from the issuer in a private placement at $10.00 per Private Placement Unit (the "Private Placement"), as described in the issuer's registration statement on Form S-1 (File No. 333-285974) (the "Registration Statement"). Each Private Placement Unit is comprised of one Private Placement Share and one-half of one warrant (the "Private Placement Warrants"), each whole Private Placement Warrant exercisable to purchase one Private Placement Share. Does not represent any Private Placement Shares issuable upon the exercise of Private Placement Warrants. ( 3 )Pursuant to the Issuer's amended and restated memorandum and articles of association, the Class B ordinary shares have no expiration date and will automatically convert into Class A ordinary shares at the time of the Issuer's initial business combination on a one-for-one basis subject to adjustment pursuant to certain anti-dilution rights. ( 4 )The Class B ordinary shares reported herein include up to 757,500 Class B ordinary shares that are subject to forfeiture to the extent the underwriters of the initial public offering of the issuer's securities do not exercise in full their over-allotment option, as described in the Registration Statement. The over-allotment option of the underwriters expires 45-day from the date of the final prospectus related to the issuer's initial public offering.

Remarks: Exhibit 24 - Power of Attorney

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