Perimeter Acquisition Corp. I (PMTR)

Nasdaq: PMTR · Blank Checks · Dallas, TX · filing with the SEC since 2025

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Grade5.1

◀ Past 5.3● Present 5.1▶ Future 5.0

8 est.

Overview Business Financials Grade Forecast Sentiment Ownership People Filings Patents Chart

Who owns Perimeter Acquisition Corp. I

As filed with the SEC

Holders of 5% or more

Harraden Circle Investments, LLC holds 9.85% of Class A, as its SCHEDULE 13G/A filed Aug 14, 2026 says.

Directors and officers

report now, of 8 people on the record since 2025. Their holdings as a group are not read here.

Institutions as a whole

n/a

The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 5 named at left.

Holders of 5% or moreshare of the class, as filed

Harraden Circle Investments, LLC

SCHEDULE 13G/A · filed Aug 14, 2026 · Class A · 9.28% in Feb 13, 2026

9.85%

Fort Baker Capital Management LP

SCHEDULE 13G · filed May 15, 2026 · Class A Ordinary Shares, $0.0001 par value

6.3%

Alberta Investment Management Corp

SCHEDULE 13G · filed May 19, 2025 · Class A Ordinary Shares, par value $0.0001 per share

6.1%

Linden Advisors LP

SCHEDULE 13G · filed May 15, 2025 · Class A ordinary shares, par value $0.0001 per share

6.1%

Magnetar Financial LLC

SCHEDULE 13G · filed Aug 8, 2025 · Class A ordinary shares, par value $0.0001

6.05%

Healthcare of Ontario Pension Plan Trust Fund

SCHEDULE 13G/A · filed Feb 13, 2026 · Class A Ordinary Shares, $0.0001 par value · reported falling below 5%, from 5% in Nov 13, 2025

under 5%

What PMTR reports owning in othersstakes of 5% or more, and other ties

Perimeter Acquisition Corp. I reports no stake in another company in the record.

Insider tradesForm 4

0sales

0purchases

0sales on a scheduled plan

0people selling

$0sold, in dollars

$0bought, in dollars

Open-market trades on Form 4 from Sep 30, 2025 to Sep 30, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.

By calendar yearSoldBought

No open-market trade is on the record for these years.

Dollars as filed, summed by the transaction date.

People who traded in the window

No one on the roster filed an open-market trade in the window.

SI Assistanton PMTR · research, not advice