Perimeter Acquisition Corp. I - Class A ordinary shares, $0.0001 par value (PMTR) Institutional Ownership

13F Institutional Holders and Ownership History from Q2 2025 to Q3 2025

Type / Class
Equity / Class A ordinary shares, $0.0001 par value
Symbol
PMTR on Nasdaq
Shares outstanding
25,000,000
Price per share
$10.28
All holders as of 30 Sep 2025
Q3 2025
Total 13F shares
21,728,201
Total reported value
$221,597,902
% of total 13F portfolios
0%
Share change
+4,944,153
Value change
+$50,362,783
Number of holders
43
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Significant Owners of Perimeter Acquisition Corp. I - Class A ordinary shares, $0.0001 par value (PMTR) based on Schedule 13D/G filings

Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
Magnetar Financial LLC 6% 1,500,000 MAGNETAR FINANCIAL LLC 30 Jun 2025
HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND 5% -18% $12,700,000 -$2,540,000 1,250,000 -17% Healthcare of Ontario Pension Plan Trust Fund 30 Sep 2025

As of 30 Sep 2025, 43 institutional investors reported holding 21,728,201 shares of Perimeter Acquisition Corp. I - Class A ordinary shares, $0.0001 par value (PMTR). This represents 87% of the company’s total 25,000,000 outstanding shares.

Top 25 Institutional Shareholders

The largest institutional shareholders of Perimeter Acquisition Corp. I - Class A ordinary shares, $0.0001 par value (PMTR) together control 79% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.

Institution Ownership % Shares Held Share Change % Portfolio % Holdings Value
Harraden Circle Investments, LLC 7.6% 1,899,998 0% 3.8% $19,322,980
Linden Advisors LP 6% 1,500,000 0% 0.1% $15,375,000
Magnetar Financial LLC 6% 1,500,000 0% 0.09% $15,375,000
Alberta Investment Management Corp 6% 1,500,000 0% 0.15% $15,375,000
HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND 5% 1,250,000 -17% 0.02% $12,812,500
TORONTO DOMINION BANK 4.8% 1,206,314 0.02% $12,268,213
METEORA CAPITAL, LLC 4.8% 1,202,619 +15% 1.3% $12,230,635
MOORE CAPITAL MANAGEMENT, LP 4.8% 1,200,000 0.24% $12,204,000
Governors Lane LP 4.7% 1,167,000 0% 1.6% $11,868,390
Saba Capital Management, L.P. 4.2% 1,055,870 -0.27% 0.35% $10,738,198
Fort Baker Capital Management LP 3.2% 800,000 0% 1.3% $8,136,000
Sculptor Capital LP 2.6% 660,249 +32% 0.09% $6,714,732
TWO SIGMA INVESTMENTS, LP 2.1% 537,309 0% 0.01% $5,464,433
Ghisallo Capital Management LLC 2% 500,000 0.17% $5,125,000
D. E. Shaw & Co., Inc. 2% 500,000 0% 0% $5,125,000
HBK INVESTMENTS L P 1.6% 400,000 0.06% $4,068,000
GLAZER CAPITAL, LLC 1.5% 375,187 -9.9% 0.13% $3,816,000
Periscope Capital Inc. 1.5% 365,000 +79% 0.9% $3,712,050
Shaolin Capital Management LLC 1.4% 342,829 -45% 0.17% $3,486,571
PICTON MAHONEY ASSET MANAGEMENT 1.3% 325,000 0.04% $3,306,000
AQR Arbitrage LLC 1.2% 301,692 0.08% $3,092,343
COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS 1.2% 300,000 0.02% $3,051,000
MILLENNIUM MANAGEMENT LLC 1.2% 298,000 0% $3,030,660
Centiva Capital, LP 1% 250,000 0.24% $2,562,500
K2 PRINCIPAL FUND, L.P. 0.99% 247,237 0% 0.32% $2,514,400

Institutional Holders of Perimeter Acquisition Corp. I - Class A ordinary shares, $0.0001 par value (PMTR) across Reporting Periods

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2025 Q3 21,728,201 $221,597,902 +$50,362,783 $10.17 43
2025 Q2 16,784,548 $170,864,471 +$169,595,144 $10.17 25