UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2025 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from __________ to _______________ Commission file number 001-42642 Perimeter Acquisition Corp. I (Exact Name of Registrant as Specified in Its Charter) Cayman Islands 98-1843886 ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION (MARK ONE) ☒QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarter ended September 30, 2025 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-42642 Perimeter Acquisition Corp. I (Exact Name of Registrant as Specified in Its Charter) | Cayman Islands | 98-1843886 | | --- | --- | | (State or other jurisdiction o ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (MARK ONE) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarter ended June 30, 2025 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Commission file number: 001-42642 Perimeter Acquisition Corp. I (Exact Name of Registrant as Specified in Its Charter) | Cayman Islands | 98-1843886 | | --- | --- | | (State or other jurisdiction of | ( ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (MARK ONE) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarter ended March 31, 2025 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-42642 Perimeter Acquisition Corp. I (Exact Name of Registrant as Specified in Its Charter) | Cayman Islands | 98-1843886 | | --- | --- | | ...

As filed with the U.S. Securities and Exchange Commission on May 6, 2025. No. 333-285974 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 AMENDMENT NO. 2 TO FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Perimeter Acquisition Corp. I (Exact name of registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) Cayman Islands 6770 98-1843886 (Primary Standard Industrial Classification Code Number) (I.R.S. Employer Identification ...

As filed with the U.S. Securities and Exchange Commission on April 18, 2025. No. 333-285974 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 AMENDMENT NO. 1 TO FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Perimeter Acquisition Corp. I (Exact name of registrant as specified in its charter) Cayman Islands 6770 98-1843886 (State or other jurisdiction of incorporation or organization) (Primary Standard Industrial (I.R.S. Employer Identification No.) 6060 N. Central Exp ...

As filed with the U.S. Securities and Exchange Commission on March 20, 2025. No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Perimeter Acquisition Corp. I (Exact name of registrant as specified in its charter) Cayman Islands 6770 98-1843886 (State or other jurisdiction of incorporation or organization) (Primary Standard Industrial Classification Code Number) (I.R.S. Employer Identification No.) 6060 N. Central ...