HOOPP (PMTR) discloses 1.8% passive stake in Perimeter Acquisition Corp. I

Rhea-AI Filing Summary

Healthcare of Ontario Pension Plan Trust Fund filed an amended Schedule 13G reporting its ownership in Perimeter Acquisition Corp. I, a Cayman Islands blank check company. HOOPP reports beneficial ownership of 450,000 Class A ordinary shares, representing 1.8% of the class based on 24,788,000 shares outstanding as of November 12, 2025.

HOOPP has sole voting and dispositive power over these shares and no shared power. The filing states the securities were acquired and are held in the ordinary course of business, and not for the purpose of changing or influencing control of the issuer.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 2)

Perimeter Acquisition Corp. I

(Name of Issuer)

Class A Ordinary Shares, $0.0001 par value

(Title of Class of Securities)

G7010A129

(CUSIP Number)

12/31/2025

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No. G7010A129

1

Names of Reporting Persons

Healthcare of Ontario Pension Plan Trust Fund

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

ONTARIO, CANADA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 450,000.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 450,000.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

450,000.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

1.8 %

12

Type of Reporting Person (See Instructions)

FI

Comment for Type of Reporting Person: In reference to Rows 5, 7 and 9 above, amount consists of Class A ordinary shares, $0.0001 par value ("Class A Shares"), of Perimeter Acquisition Corp. I, a blank check company formed under the laws of the Cayman Islands (the "Issuer"). In reference to Row 11 above, percentage ownership is based on 24,788,000 Class A Shares issued and outstanding as of November 12, 2025, as reported on the Issuer's quarterly report on Form 10-Q for the quarter ended on September 30, 2025, filed with the Securities and Exchange Commission on November 12, 2025.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Perimeter Acquisition Corp. I
(b)	Address of issuer's principal executive offices: 4514 Cole Avenue, Suite 1600, Dallas, Texas, 75204
Item 2.
(a)	Name of person filing: Healthcare of Ontario Pension Plan Trust Fund ("HOOPP")
(b)	Address or principal business office or, if none, residence: 1 York Street, Suite 1900, Toronto, Ontario, Canada, M5J 0B6
(c)	Citizenship: Ontario, Canada
(d)	Title of class of securities: Class A Ordinary Shares, $0.0001 par value
(e)	CUSIP No.: G7010A129
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
	A pension plan formed as a trust under the laws of Ontario, Canada and registered with the Financial Services Regulatory Authority of Ontario.
Item 4.	Ownership
(a)	Amount beneficially owned: See Item 9 on page 2.
(b)	Percent of class: See Item 11 on page 2.
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: See Item 5 on page 2.
	(ii) Shared power to vote or to direct the vote: See Item 6 on page 2.
	(iii) Sole power to dispose or to direct the disposition of: See Item 7 on page 2.
	(iv) Shared power to dispose or to direct the disposition of: See Item 8 on page 2.
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11. By signing below I certify that, to the best of my knowledge and belief, the regulatory scheme applicable to a pension plan formed as a trust under the laws of Ontario, Canada and registered with the Financial Services Regulatory Authority of Ontario is substantially comparable to the regulatory scheme applicable to the functionally equivalent U.S. institution(s). I also undertake to furnish to the Securities and Exchange Commission staff, upon request, information that would otherwise be disclosed in a Schedule 13D.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Healthcare of Ontario Pension Plan Trust Fund

Signature:	/s/ Abas Kanu
Name/Title:	Abas Kanu, VP, HOOPP Compliance Officer
Date:	02/13/2026

FAQ

What stake does Healthcare of Ontario Pension Plan hold in PMTR?

Healthcare of Ontario Pension Plan Trust Fund holds 450,000 Class A ordinary shares of Perimeter Acquisition Corp. I, representing 1.8% of the class, based on 24,788,000 shares outstanding as of November 12, 2025, as disclosed in the amended Schedule 13G filing.

What type of filing did HOOPP submit for Perimeter Acquisition Corp. I (PMTR)?

HOOPP submitted an Amendment No. 2 to Schedule 13G for Perimeter Acquisition Corp. I. This filing reports passive beneficial ownership of the company’s Class A ordinary shares, rather than an intent to influence control, consistent with institutional investor reporting under U.S. securities regulations.

Does Healthcare of Ontario Pension Plan intend to influence control of PMTR?

The filing states HOOPP acquired and holds the Perimeter Acquisition Corp. I shares in the ordinary course of business and not for the purpose of changing or influencing control, nor in connection with any transaction designed to have that effect, other than limited nomination activities referenced in the certification.

What voting and dispositive powers does HOOPP have over PMTR shares?

HOOPP reports sole voting power over 450,000 Class A ordinary shares of Perimeter Acquisition Corp. I and sole dispositive power over the same number of shares, with no shared voting or shared dispositive power, indicating exclusive authority over how these particular shares are voted and disposed.

What is Perimeter Acquisition Corp. I’s share count used in this ownership calculation?

The 1.8% ownership figure is calculated using 24,788,000 Class A ordinary shares of Perimeter Acquisition Corp. I issued and outstanding as of November 12, 2025, as reported in the company’s Form 10-Q for the quarter ended September 30, 2025 and cited in the Schedule 13G amendment.

What kind of investor is Healthcare of Ontario Pension Plan in this context?

Healthcare of Ontario Pension Plan Trust Fund is described as a pension plan formed as a trust under Ontario law, registered with the Financial Services Regulatory Authority of Ontario, and its regulatory framework is stated to be substantially comparable to similar U.S. institutions for purposes of this beneficial ownership filing.