# EDGAR Filing Document

**Accession Number:** 0001434524
**File Stem:** 9999999995-25-002705
**Filing Date:** 2025-8
**Character Count:** 1460
**Document Hash:** 5f743f308dfb564486e726137f782460
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**9999999995-25-002705.hdr.sgml**: 20250822

**ACCESSION NUMBER**: 9999999995-25-002705

**CONFORMED SUBMISSION TYPE**: EFFECT

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250821

**DATE AS OF CHANGE**: 20250822

**EFFECTIVENESS DATE**: 20250821

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ClearSign Technologies Corp
- **CENTRAL INDEX KEY:** 0001434524
- **STANDARD INDUSTRIAL CLASSIFICATION:** INDUSTRIAL INSTRUMENTS FOR MEASUREMENT, DISPLAY, AND CONTROL [3823]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** EFFECT
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-289549
- **FILM NUMBER:** 251242121

**BUSINESS ADDRESS:**
- **STREET 1:** 8023 E. 63RD PLACE, SUITE 101
- **CITY:** TULSA
- **STATE:** OK
- **ZIP:** 74133
- **BUSINESS PHONE:** (918) 236-6461

**MAIL ADDRESS:**
- **STREET 1:** 8023 E. 63RD PLACE, SUITE 101
- **CITY:** TULSA
- **STATE:** OK
- **ZIP:** 74133

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** CLEARSIGN COMBUSTION CORP
- **DATE OF NAME CHANGE:** 20080507

### UNITED STATES
### SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## Notice of Effectiveness

**Date:** August 21, 2025

**Time:** 17:00:00

**Form Type:** S-1

---

**CIK:** 0001434524

**Company Name:** ClearSign Technologies Corp

**File Number:** 333-289549