---
schema_version: "secwatch.filing_event.v1"
accession: "0001213900-26-026265"
form_type: "8-K"
ticker: "PLMK"
cik: "0002030482"
company_name: "Plum Acquisition Corp, IV"
filed_at: "2026-03-12T23:59:59+00:00"
generated_at: "2026-05-15T14:03:44.703936+00:00"
event_type: "m_and_a"
sentiment: "neutral"
materiality_score: 0.9
calibrated_materiality_score: 0.9
confidence: "high"
source: SEC EDGAR
---

# Plum IV SPAC signs business combination agreement with Controlled Thermal Resources

## Summary
- Sponsor must fund at least $15M in PIPE investment; $10M bridge note also required prior to close.
- Up to 100M earnout shares issuable in tranches if stock price reaches $12.50 to $30.00 over 10 years.
- Up to 2M non-redemption shares to be issued to holders who agree not to redeem their SPAC shares.
- Post-closing board: 4 directors from Controlled Thermal, 1 from Plum IV; stock to list on Nasdaq.
- Controlled Thermal Resources will survive as the combined company; SPAC will domesticate to Delaware.

## SEC filing metadata
- accession: 0001213900-26-026265
- form_type: 8-K
- ticker: PLMK
- cik: 0002030482
- company_name: Plum Acquisition Corp, IV
- filed_at: 2026-03-12T23:59:59+00:00
- event_type: m_and_a
- sentiment: neutral
- materiality_score: 0.9
- calibrated_materiality_score: 0.9
- confidence: high
- sec_items: 1.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/2030482/000121390026026265/0001213900-26-026265-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/2030482/000121390026026265/ea0280770-8k425_plum4.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001213900-26-026265
- JSON: https://secwatch.observer/filing/0001213900-26-026265.json
- Plain text: https://secwatch.observer/filing/0001213900-26-026265.txt

## Key facts
- Material Agreements
  Plum Acquisition Corp, IV entered into Business Combination Agreement with Controlled Thermal Resources Holdings Inc. (effective 2026-03-08).
  - Action: entry
  - Agreement: merger
  - Counterparty: Controlled Thermal Resources Holdings Inc.
  - Effective: 2026-03-08
  source text: entered into a Business Combination Agreement (the “ Business Combination Agreement ”), by and among Plum IV, Plum IV Merger Sub, Inc., a Delaware corporation and a direct wholly owned subsidiary of Plum IV (“ Merger Sub ”), and Controlled Thermal Resources Holdings Inc., a Delaware corporation (the “ Company ”)
  evidence_url: https://www.sec.gov/Archives/edgar/data/2030482/000121390026026265/0001213900-26-026265-index.htm

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