---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-26-075734"
form_type: "8-K"
ticker: "CLIR"
cik: "0001434524"
company_name: "ClearSign Technologies Corp"
filed_at: "2026-06-18T20:15:25+00:00"
generated_at: "2026-06-18T20:23:17.352652+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.3
calibrated_materiality_score: 0.3
confidence: "high"
source: SEC EDGAR
---

# ClearSign closes full over-allotment of 116,667 shares for ~$471K net proceeds

## Summary
- Underwriter Newbridge Securities purchased 116,667 additional shares at $4.33 each, fully exercising the over-allotment option.
- Net proceeds to ClearSign were approximately $470,858 after underwriting discounts and estimated expenses.
- Proceeds will be used for working capital, R&D, marketing, sales, and general corporate purposes.
- The over-allotment was part of a firm-commitment public offering that initially closed June 1, 2026.

## SEC filing metadata
- accession: 0001104659-26-075734
- form_type: 8-K
- ticker: CLIR
- cik: 0001434524
- company_name: ClearSign Technologies Corp
- filed_at: 2026-06-18T20:15:25+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.3
- calibrated_materiality_score: 0.3
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1434524/000110465926075734/0001104659-26-075734-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1434524/000110465926075734/tm2618244d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-26-075734
- JSON: https://secwatch.observer/filing/0001104659-26-075734.json
- Plain text: https://secwatch.observer/filing/0001104659-26-075734.txt

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