---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-25-052251"
form_type: "8-K"
ticker: "CLIR"
cik: "0001434524"
company_name: "ClearSign Technologies Corp"
filed_at: "2025-05-23T23:59:59+00:00"
generated_at: "2026-05-20T13:43:19.067681+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "medium"
source: SEC EDGAR
---

# ClearSign provides Q1 update: cash $12.8M, co-branded burners with Zeeco, M Series sales

## Summary
- Cash and equivalents $12.8M at March 31, 2025; 52.4M shares outstanding.
- Launched co-branded Zeeco CS5 and Hydrogen CS5 burner lines (100% H2-capable, sub-5 ppm NOx).
- Sold first M Series burners via channel partner and directly to heater manufacturer Devco.
- Received commitments for first commercial ClearSign Eye sensor installation at a supermajor Gulf Coast refinery.
- Received third low-emissions flare burner engineering order from a California energy company.

## SEC filing metadata
- accession: 0001104659-25-052251
- form_type: 8-K
- ticker: CLIR
- cik: 0001434524
- company_name: ClearSign Technologies Corp
- filed_at: 2025-05-23T23:59:59+00:00
- event_type: other_material
- sentiment: positive
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: medium
- sec_items: 2.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1434524/000110465925052251/0001104659-25-052251-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1434524/000110465925052251/tm2516021d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-25-052251
- JSON: https://secwatch.observer/filing/0001104659-25-052251.json
- Plain text: https://secwatch.observer/filing/0001104659-25-052251.txt

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