---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-26-025867"
form_type: "8-K"
ticker: "CLIR"
cik: "0001434524"
company_name: "ClearSign Technologies Corp"
filed_at: "2026-03-10T23:59:59+00:00"
generated_at: "2026-05-15T15:49:32.972810+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# ClearSign Technologies announces 1-for-10 reverse stock split effective March 16, 2026

## Summary
- Reverse stock split ratio 1-for-10, effective 12:01 a.m. ET on March 16, 2026.
- Pre-split shares ~54.1M; post-split ~5.41M; authorized shares and par value unchanged.
- Split intended to regain compliance with Nasdaq $1.00 minimum bid price requirement.
- Fractional shares rounded up; proportionate adjustments to warrants and equity awards.
- CUSIP changes to 185064201; trading symbol remains CLIR.

## SEC filing metadata
- accession: 0001104659-26-025867
- form_type: 8-K
- ticker: CLIR
- cik: 0001434524
- company_name: ClearSign Technologies Corp
- filed_at: 2026-03-10T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 3.03, 5.03, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1434524/000110465926025867/0001104659-26-025867-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1434524/000110465926025867/tm268062d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-26-025867
- JSON: https://secwatch.observer/filing/0001104659-26-025867.json
- Plain text: https://secwatch.observer/filing/0001104659-26-025867.txt

## Key facts
- Governance Changes
  ClearSign Technologies Corp: Filed a charter amendment to effect a 1-for-10 reverse stock split (effective 2026-03-16).
  - Change: charter amendment
  - Effective: 2026-03-16
  source text: On March 6, 2026, ClearSign Technologies Corporation (the “Company”) filed an amendment (the “Charter Amendment”) to its certificate of incorporation, as amended, with the Secretary of State of Delaware to implement a 1-for-10 reverse stock split, such that every ten (10) shares of the Company’s common stock, par value $0.0001 per share (the “common stock”), will be combined into one (1) issued and outstanding share of common stock, with no change in the $0.0001 par value per share (the “Reverse Stock Split”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/1434524/000110465926025867/0001104659-26-025867-index.htm
- Governance Changes
  ClearSign Technologies Corp reported a fiscal year change.
  - Change: fiscal year change
  source text: the information regarding the Reverse Stock Split (as defined below) set forth below in Item 5.03 of this Current Report on Form 8-K is incorporated by reference herein in its entirety.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1434524/000110465926025867/0001104659-26-025867-index.htm

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