---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-24-052066"
form_type: "8-K"
ticker: "CLIR"
cik: "0001434524"
company_name: "ClearSign Technologies Corp"
filed_at: "2024-04-25T23:59:59+00:00"
generated_at: "2026-06-03T07:48:39.535199+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# ClearSign reports record 2023 revenue of $2.4M, up 542% YoY; raises $9.3M

## Summary
- Full year 2023 revenue $2.4M vs $374K in 2022; Q4 2023 revenue $1.2M vs $50K in Q4 2022.
- Raised ~$9.3M gross from underwritten public offering and private placement, closed April 23, 2024.
- Received California SCAQMD BACT emissions limits based on its process burner performance.
- First multi-boiler burner purchase order from California Boiler for four boilers with ClearSign Core burners.
- Cash and equivalents $5.6M as of Dec 31, 2023; 38.7M shares outstanding.

## SEC filing metadata
- accession: 0001104659-24-052066
- form_type: 8-K
- ticker: CLIR
- cik: 0001434524
- company_name: ClearSign Technologies Corp
- filed_at: 2024-04-25T23:59:59+00:00
- event_type: other_material
- sentiment: positive
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 2.02, 7.01, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1434524/000110465924052066/0001104659-24-052066-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1434524/000110465924052066/tm2412742d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-24-052066
- JSON: https://secwatch.observer/filing/0001104659-24-052066.json
- Plain text: https://secwatch.observer/filing/0001104659-24-052066.txt

## Key facts
- Earnings Releases
  ClearSign Technologies Corp reported year ended December 31, 2023 results: revenue $2.4 million.
  - Period: year ended December 31, 2023
  - Revenue: $2.4 million
  - Result: reported results
  source text: The Company reported $2.4 million revenue for the full year 2023 compared to $374 thousand for the comparable period in 2022.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1434524/000110465924052066/0001104659-24-052066-index.htm

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