Perimeter Acquisition Corp. I

PMTRW

Exchange: Nasdaq
Industry: Blank Checks
SEC CIK: 0002061473

SEC filings (opens in a new tab)

No open-market purchases or sales by Perimeter Acquisition Corp. I insiders were filed in the last 90 days; 38 institutions reported holding it in 13F filings for Q2 2026, worth $9.39M in total; no superinvestor holds it.

Other share classesPMTR PMTRU

Q1 2026 vs. Q4 2025

How the institutions holding Perimeter Acquisition Corp. I changed between Q4 2025 and Q1 2026.

All holders in Q1 2026 All holders in Q4 2025

13F holders of PMTRW: Q4 2025 compared with Q1 2026
Measure	Q4 2025	Q1 2026	Change
Holders	35	35	0
Shares	10.5M	10.4M	−47.6K (−0.5%)
Value	$7.59M	$6.94M	−$642.5K (−8.5%)

New holders (2)

Institutions that held Perimeter Acquisition Corp. I at the end of Q1 2026 but not at the end of Q4 2025.

Institutions new to PMTRW in Q1 2026
Institution	Shares	Value	% of portfolio
Westchester Capital Management, LLC	74,998	$45.0K	0.00%
Boothbay Fund Management, LLC	13,732	–	–

Sold out (2)

Institutions that held Perimeter Acquisition Corp. I at the end of Q4 2025 and filed for Q1 2026 without it.

Institutions that sold out of PMTRW in Q1 2026
Institution	Shares, Q4 2025	Value, Q4 2025
CSS LLC	25,000	$17.7K
Clear Street Group Inc.	22,872	$16.2K