---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-26-065175"
form_type: "8-K"
ticker: "CLIR"
cik: "0001434524"
company_name: "ClearSign Technologies Corp"
filed_at: "2026-05-21T20:30:33+00:00"
generated_at: "2026-05-21T21:03:59.182583+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.55
calibrated_materiality_score: 0.55
confidence: "medium"
source: SEC EDGAR
---

# ClearSign Q1 cash $7.7M; operational progress with multiple burner orders and DOE testing

## Summary
- Cash and cash equivalents $7.7M as of March 31, 2026; shares outstanding 5,409,133 after 1-for-10 reverse split.
- Received 'M1' Series burner order for midstream heater in West Texas, delivery Q3 2026.
- Received order for next phase of 32-burner retrofit project at a California refinery (physical testing).
- Successful sub-5ppm DOE/SBIR flexible fuel burner testing (ClearSign Core Gen 2, 100% hydrogen capable).
- Received fifth low-emission flare order from California energy company, total enclosed flare system, delivery Q3 2026.

## SEC filing metadata
- accession: 0001104659-26-065175
- form_type: 8-K
- ticker: CLIR
- cik: 0001434524
- company_name: ClearSign Technologies Corp
- filed_at: 2026-05-21T20:30:33+00:00
- event_type: other_material
- sentiment: positive
- materiality_score: 0.55
- calibrated_materiality_score: 0.55
- confidence: medium
- sec_items: 2.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1434524/000110465926065175/0001104659-26-065175-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1434524/000110465926065175/tm2615171d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-26-065175
- JSON: https://secwatch.observer/filing/0001104659-26-065175.json
- Plain text: https://secwatch.observer/filing/0001104659-26-065175.txt

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