---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-26-042017"
form_type: "8-K"
ticker: "CLIR"
cik: "0001434524"
company_name: "ClearSign Technologies Corp"
filed_at: "2026-04-10T23:59:59+00:00"
generated_at: "2026-05-15T06:40:00.189871+00:00"
event_type: "earnings"
sentiment: "positive"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# ClearSign Q4 revenue $3.7M record; FY revenue $5.2M +44% YoY

## Summary
- Q4 2025 revenue $3.7M (record); FY revenue $5.2M, up 44% YoY.
- Cash $9.2M at Dec 31, 2025; 5.33M shares outstanding post 1-for-10 reverse split.
- Orders for 68 ClearSign Core burners from Gulf Coast and California refiners; also flare order.
- Successful DOE/NETL testing of 100% hydrogen-capable ClearSign Core-2 burner.
- Backlog includes new heater configurations; management expects continued momentum.

## SEC filing metadata
- accession: 0001104659-26-042017
- form_type: 8-K
- ticker: CLIR
- cik: 0001434524
- company_name: ClearSign Technologies Corp
- filed_at: 2026-04-10T23:59:59+00:00
- event_type: earnings
- sentiment: positive
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 2.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1434524/000110465926042017/0001104659-26-042017-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1434524/000110465926042017/tm2611530d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-26-042017
- JSON: https://secwatch.observer/filing/0001104659-26-042017.json
- Plain text: https://secwatch.observer/filing/0001104659-26-042017.txt

## Key facts
- Earnings Releases
  ClearSign Technologies Corp reported financial results for the fourth quarter and full year ended December 31, 2025.
  - Period: the fourth quarter and full year ended December 31, 2025
  - Result: reported results
  source text: ClearSign Technologies Corporation Provides Fourth Quarter and Full Year 2025 Update Achieves Record Quarterly Revenue of $3.7 Million Annual Revenue Up 44% to Record $5.2 Million TULSA, Okla., April 9, 2026
  evidence_url: https://www.sec.gov/Archives/edgar/data/1434524/000110465926042017/0001104659-26-042017-index.htm

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