Perimeter Acquisition Corp I (PMTR) investor discloses 2.44M-share, 9.85% position

Rhea-AI Filing Summary

Perimeter Acquisition Corp I has a significant shareholder group reporting its current position in the Class A shares. Harraden Circle Investments, LLC and its managing member, Frederick V. Fortmiller, Jr., report beneficial ownership of 2,440,298 Class A shares, representing 9.85% of the class.

All 2,440,298 shares are held with shared voting and dispositive power, and neither reporting person has sole voting or dispositive authority. The position is held across several Harraden-managed funds, and an internal reorganization effective June 30, 2026 removed certain prior reporting persons who are no longer beneficial owners.

Key Figures

Beneficially owned shares: 2,440,298 shares Percent of class: 9.85% Shared voting power: 2,440,298 shares +2 more

5 metrics

Beneficially owned shares 2,440,298 shares Class A shares beneficially owned by the reporting persons

Percent of class 9.85% Percentage of Perimeter Acquisition Corp I Class A shares owned

Shared voting power 2,440,298 shares Shares over which the reporting persons share voting power

Shared dispositive power 2,440,298 shares Shares over which the reporting persons share dispositive power

Effective reorganization date 06/30/2026 Date of internal reorganization affecting beneficial ownership reporting

Key Terms

beneficially owned, shared voting power, shared dispositive power, parent holding company, +1 more

5 terms

beneficially owned financial

"Item 4. | Ownership (a) | Amount beneficially owned: 2,440,298"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

shared voting power financial

"6 | Shared Voting Power 2,440,298.00"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

shared dispositive power financial

"8 | Shared Dispositive Power 2,440,298.00"

parent holding company financial

"Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company"

Schedule 13G regulatory

"remaining reporting persons qualify to file under "

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

FAQ

What percentage of Perimeter Acquisition Corp I (PMTR) does Harraden Circle Investments own?

Harraden Circle Investments, LLC and Frederick V. Fortmiller, Jr. report beneficial ownership of 9.85% of Perimeter Acquisition Corp I’s Class A shares, totaling 2,440,298 shares held with shared voting and dispositive power across several Harraden-managed funds.

How many Perimeter Acquisition Corp I (PMTR) shares are beneficially owned by the reporting persons?

The reporting persons beneficially own 2,440,298 Class A shares of Perimeter Acquisition Corp I. All these shares are subject to shared voting and shared dispositive power, with no sole voting or dispositive authority reported.

Who are the reporting persons in the Perimeter Acquisition Corp I (PMTR) Schedule 13G/A?

The reporting persons are Harraden Circle Investments, LLC, a Delaware limited liability company, and Frederick V. Fortmiller, Jr., its managing member. They exercise voting and dispositive power over shares held in various Harraden-managed investment funds.

What change is described regarding beneficial ownership of Perimeter Acquisition Corp I (PMTR)?

An internal reorganization effective June 30, 2026 resulted in removal of certain prior reporting persons who are no longer beneficial owners of the securities. The remaining reporting persons now alone report the 2,440,298 shares and 9.85% stake.

How is voting power over Perimeter Acquisition Corp I (PMTR) shares allocated for the reporting persons?

Both Harraden Circle Investments, LLC and Frederick V. Fortmiller, Jr. report 0 shares with sole voting or dispositive power and 2,440,298 shares with shared voting and shared dispositive power over Perimeter Acquisition Corp I’s Class A stock.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/14/2026 - 11:01 AM Accepted by SEC EDGAR 08/14/2026 - 11:00 AM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 3)

Perimeter Acquisition Corp I

(Name of Issuer)

Class A

(Title of Class of Securities)

G7010A129

(CUSIP Number)

06/30/2026

(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)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): G7010A129

1

Names of Reporting Persons

Harraden Circle Investments, LLC

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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 2,440,298.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,440,298.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,440,298.00

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)

9.85 %

12

Type of Reporting Person (See Instructions)

OO, IA

SCHEDULE 13G

CUSIP Number(s): G7010A129

1

Names of Reporting Persons

Frederick V. Fortmiller, Jr.

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

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 2,440,298.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,440,298.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,440,298.00

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)

9.85 %

12

Type of Reporting Person (See Instructions)

HC, IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Perimeter Acquisition Corp I
(b)	Address of issuer's principal executive offices: 12700 Hillcrest Rd, Suite 125, Dallas, Texas, 75230
Item 2.
(a)	Name of person filing: This Statement is filed on behalf of Harraden Circle Investments, LLC ("Harraden Adviser") and Frederick V. Fortmiller, Jr. ("Mr. Fortmiller") (collectively, the "Reporting Persons"). This Statement relates to Shares (as defined herein) held for the accounts of Harraden Circle Investors, LP ("Harraden Fund"), Harraden Circle Special Opportunities, LP ("Harraden Special Op Fund"), Harraden Circle Strategic Investments, LP ("Harraden Strategic Fund"), and Harraden Circle Concentrated, LP ("Harraden Concentrated Fund"). Harraden Adviser serves as investment manager to Harraden Fund, Harraden Special Op Fund, Harraden Strategic Fund, Harraden Concentrated Fund, and other high net worth individuals and, in such capacity, exercises voting and dispositive power over the Shares reported herein. Mr. Fortmiller is the managing member of Harraden Adviser.
(b)	Address or principal business office or, if none, residence: 885 Third Avenue, Suite 2600B, New York, NY 10022
(c)	Citizenship: Harraden Adviser is a Delaware limited liability company. Mr. Fortmiller is a citizen of the United States of America.
(d)	Title of class of securities: Class A
(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).
Item 4.	Ownership
(a)	Amount beneficially owned: 2,440,298
(b)	Percent of class: 9.85 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 2,440,298
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 2,440,298
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. Certain funds identified in Item 2(a) have the right to receive any dividends from, or the proceeds from the sale of, the securities reported herein.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See disclosure in Item 2 hereof.
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.

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.

Harraden Circle Investments, LLC

Signature:	/s/ Frederick V. Fortmiller, Jr.
Name/Title:	Frederick V. Fortmiller, Jr., managing member
Date:	08/14/2026

Frederick V. Fortmiller, Jr.

Signature:	/s/ Frederick V. Fortmiller, Jr.
Name/Title:	Frederick V. Fortmiller, Jr.
Date:	08/14/2026

Comments accompanying signature: This Schedule 13G amends the Schedule 13G filed under Rule 13d-1(c) to remove the reporting persons who, after an internal reorganization effective June 30, 2026, are no longer beneficial owners of the securities reported herein and to change the Rule under which this Schedule 13G is filed to Rule 13d-1(b), because the remaining reporting persons qualify to file Schedule 13G under Rule 13d-1(b).