---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-24-073167"
form_type: "8-K"
ticker: "CLIR"
cik: "0001434524"
company_name: "ClearSign Technologies Corp"
filed_at: "2024-06-20T23:59:59+00:00"
generated_at: "2026-06-01T03:20:45.184359+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# ClearSign board member resigns; clirSPV exercises full participation right for ~$4.3M

## Summary
- Board member Robert T. Hoffman Sr. resigned effective June 16, 2024; successor designee being vetted.
- clirSPV LLC exercised Participation Right in full, purchasing shares and warrants for ~$4.3M gross proceeds.
- Exercise includes 3.9M common shares, pre-funded warrants for 786K shares, redeemable warrants for 7.0M shares.
- Expected close on or about June 24, 2024; proceeds for working capital, R&D, sales.
- Hoffman said clirSPV's total capital infusion now $19.1M; believes sales funnel will convert to orders.

## SEC filing metadata
- accession: 0001104659-24-073167
- form_type: 8-K
- ticker: CLIR
- cik: 0001434524
- company_name: ClearSign Technologies Corp
- filed_at: 2024-06-20T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 5.02, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1434524/000110465924073167/0001104659-24-073167-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1434524/000110465924073167/tm2417562d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-24-073167
- JSON: https://secwatch.observer/filing/0001104659-24-073167.json
- Plain text: https://secwatch.observer/filing/0001104659-24-073167.txt

## Key facts
- Executive change
  Robert T. Hoffman, Sr. resigned as Director at ClearSign Technologies Corp.
  - Action: resigned
  - Role: Director
  source text: On June 16, 2024, Robert T. Hoffman, Sr., notified the board of directors (the “Board”) of ClearSign Technologies Corporation (the “Company”) that he resigned from the Board, effective immediately.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1434524/000110465924073167/0001104659-24-073167-index.htm

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