---
schema_version: "secwatch.filing_event.v1"
accession: "0001641172-25-010372"
form_type: "8-K"
ticker: "PMTR"
cik: "0002061473"
company_name: "Perimeter Acquisition Corp. I"
filed_at: "2025-05-14T23:59:59+00:00"
generated_at: "2026-05-21T10:55:01.114812+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Perimeter Acquisition Corp. I closes upsized $241.5M IPO; trust funded, board appointed

## Summary
- IPO of 24.15M units at $10/unit, including full over-allotment exercise, gross proceeds $241.5M.
- Concurrent private placement of 638,000 units to sponsor at $10/unit, raising $6.38M.
- Total $241.5M placed in trust for initial business combination within 24 months.
- Directors appointed: Richard Berthy, M. Scott Faris, Scott Letier, VAdm Sean Pybus (ret.), Jack Selby; Joseph Valdman resigned.
- SPAC targets defense, national security, and technology sectors for business combination.

## SEC filing metadata
- accession: 0001641172-25-010372
- form_type: 8-K
- ticker: PMTR
- cik: 0002061473
- company_name: Perimeter Acquisition Corp. I
- filed_at: 2025-05-14T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 1.01, 3.02, 5.02, 5.03, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/2061473/000164117225010372/0001641172-25-010372-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/2061473/000164117225010372/form8-k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001641172-25-010372
- JSON: https://secwatch.observer/filing/0001641172-25-010372.json
- Plain text: https://secwatch.observer/filing/0001641172-25-010372.txt

## Key facts
- Executive change
  Jack Selby was appointed as director at Perimeter Acquisition Corp. I.
  - Action: appointed
  - Role: director
  source text: On May 13, 2025, in connection with the IPO, Richard Berthy, M. Scott Faris, Scott Letier, Vice Admiral Sean Pybus (ret.) and Jack Selby were appointed to the board of directors of the Company (the “ Board ”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/2061473/000164117225010372/0001641172-25-010372-index.htm
- Executive change
  Scott Letier was appointed as director at Perimeter Acquisition Corp. I.
  - Action: appointed
  - Role: director
  source text: On May 13, 2025, in connection with the IPO, Richard Berthy, M. Scott Faris, Scott Letier, Vice Admiral Sean Pybus (ret.) and Jack Selby were appointed to the board of directors of the Company (the “ Board ”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/2061473/000164117225010372/0001641172-25-010372-index.htm
- Executive change
  Joseph Valdman resigned as director at Perimeter Acquisition Corp. I.
  - Action: resigned
  - Role: director
  source text: Effective May 13, 2025, Joseph Valdman resigned from the Board.
  evidence_url: https://www.sec.gov/Archives/edgar/data/2061473/000164117225010372/0001641172-25-010372-index.htm
- Executive change
  Vice Admiral Sean Pybus (ret.) was appointed as director at Perimeter Acquisition Corp. I.
  - Action: appointed
  - Role: director
  source text: On May 13, 2025, in connection with the IPO, Richard Berthy, M. Scott Faris, Scott Letier, Vice Admiral Sean Pybus (ret.) and Jack Selby were appointed to the board of directors of the Company (the “ Board ”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/2061473/000164117225010372/0001641172-25-010372-index.htm
- Executive change
  M. Scott Faris was appointed as director at Perimeter Acquisition Corp. I.
  - Action: appointed
  - Role: director
  source text: On May 13, 2025, in connection with the IPO, Richard Berthy, M. Scott Faris, Scott Letier, Vice Admiral Sean Pybus (ret.) and Jack Selby were appointed to the board of directors of the Company (the “ Board ”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/2061473/000164117225010372/0001641172-25-010372-index.htm
- Executive change
  Richard Berthy was appointed as director at Perimeter Acquisition Corp. I.
  - Action: appointed
  - Role: director
  source text: On May 13, 2025, in connection with the IPO, Richard Berthy, M. Scott Faris, Scott Letier, Vice Admiral Sean Pybus (ret.) and Jack Selby were appointed to the board of directors of the Company (the “ Board ”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/2061473/000164117225010372/0001641172-25-010372-index.htm
- Governance Changes
  Perimeter Acquisition Corp. I: Adopted Amended and Restated Memorandum and Articles of Association (effective 2025-05-12).
  - Change: charter amendment
  - Effective: 2025-05-12
  source text: On May 12, 2025, in connection with the IPO, the Company adopted its Amended and Restated Memorandum and Articles of Association (the “ Articles ”), effective the same day.
  evidence_url: https://www.sec.gov/Archives/edgar/data/2061473/000164117225010372/0001641172-25-010372-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.