---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-24-065617"
form_type: "8-K"
ticker: "CLIR"
cik: "0001434524"
company_name: "ClearSign Technologies Corp"
filed_at: "2024-05-28T23:59:59+00:00"
generated_at: "2026-06-01T07:57:11.419728+00:00"
event_type: "earnings"
sentiment: "positive"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# ClearSign Q1 revenue up 22% YoY to $1.1M; closes $8.7M equity offering

## Summary
- Revenue $1.1M vs $900k in Q1 2023, up 22% YoY.
- Cash and short-term investments $4.6M as of March 31, 2024.
- Closed equity offering post-quarter with net proceeds ~$8.7M; overallotment exercised May 10.
- Successful start-up of second multi-burner heater at Kern Energy; two additional engineering orders received.
- Received first multi-boiler burner purchase order via partner California Boiler.

## SEC filing metadata
- accession: 0001104659-24-065617
- form_type: 8-K
- ticker: CLIR
- cik: 0001434524
- company_name: ClearSign Technologies Corp
- filed_at: 2024-05-28T23:59:59+00:00
- event_type: earnings
- sentiment: positive
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 2.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1434524/000110465924065617/0001104659-24-065617-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1434524/000110465924065617/tm2415700d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-24-065617
- JSON: https://secwatch.observer/filing/0001104659-24-065617.json
- Plain text: https://secwatch.observer/filing/0001104659-24-065617.txt

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