ClearSign Technologies Corporation

CLIRNASDAQIndustrials● Active

$4.15

+$0.21(+5.33%)

Market Cap$25690202

P/E Ratio—

52W High$11.2

52W Low$3.24

Avg Volume35K

Open$3.93

Beta1.34

Overview

ClearSign Technologies Corporation (CLIR) Number of Employees – History & Annual Headcount

Annual SEC headcount, year-over-year change, and per-employee efficiency — chart and full history below.

SEC EDGAR · FMP · CLIR · as of Mar 31, 2026

Latest filing snapshot

-3-16.67%vs prior year

ClearSign Technologies Corporation (CLIR) employee data is sourced from the annual SEC 10-K filing. As of 2025, full-time employees only. Global consolidated headcount. View SEC filing ↗

SEC 10-K·Period end: 2025-12-31·Full-time · Global

Total Employees

Change (1Y)

-3

Growth % (1Y)

-16.67%

Revenue / Employee

$348.9K

Net Income / Employee

$-366.4K

Market Cap

$26M

CLIR Employee Count

2012 – 2025 · Annual · SEC filing

Source: SEC annual filings · Hover bar to view year data · Click to view original filing

Employees History

Filing Date	Period End	Employees	Change (1Y)	Growth (1Y)
2026-03-31	2025-12-31	15	-3	-16.67%
2025-03-31	2024-12-31	18	+3	+20.00%
2024-04-01	2023-12-31	15	-1	-6.25%
2023-03-31	2022-12-31	16	+4	+33.33%
2022-03-31	2021-12-31	12	-3	-20.00%
2021-03-31	2020-12-31	15	+0	+0.00%
2020-03-30	2019-12-31	15	-1	-6.25%
2019-03-12	2018-12-31	16	-1	-5.88%
2018-03-27	2017-12-31	17	-2	-10.53%
2017-02-14	2016-12-31	19	+1	+5.56%

▸ Source: SEC Annual Reports (Form 10-K / 20-F). Employee counts as of fiscal year end. Click the ↗ icon at the end of a row to open the original SEC filing in a new tab.

Related Companies — Employee Count

Industrial - Pollution & Treatment Controls

#SymbolCompanyEmployeesMkt Cap

Ampco-Pittsburgh Corporation

1,634$221M #2

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Hyperscale Data, Inc.

Flux Power Holdings, Inc.

ClearSign Technologies CorporationYOU

15$26M

Source: /stock-peers + /profile.fullTimeEmployees · Click row → /employees · Sorted by headcount · CLIR peer comparison

About CLIR employees

CLIR Employees · Headcount

ClearSign Technologies Corporation (CLIR) employee data is sourced from the annual SEC 10-K filing. As of 2025, ClearSign Technologies Corporation had 15 full-time employees globally. Full-time employees only. Global consolidated headcount.

ClearSign Technologies Corporation employs 15 full-time employees as of the latest filing within the Industrial - Pollution & Treatment Controls industry. Revenue per employee stands at $348,933, reflecting the company's operational efficiency.

ClearSign Technologies Corporation's workforce decreased by 3 (16.67%) in 2025 compared to the prior fiscal year. The historical trend reflects the company's expansion and contraction cycles.

ClearSign Technologies Corporation's revenue per employee of $348,933 positions it among the notable performers in the Industrial - Pollution & Treatment Controls sector for operational efficiency.

Revenue Financial statements Net income SEC filings Price history Forecast & ratings Ownership Earnings

Frequently Asked Questions

CLIR Employees · 5 questions

As of the latest SEC 10-K filing (2025), ClearSign Technologies Corporation had 15 full-time employees globally. This figure is sourced from the company's mandatory annual disclosure to the SEC.

ClearSign Technologies Corporation employee counthow many employees does ClearSign Technologies Corporation haveCLIR total employees 2025

▸ Data source: FMP /historical-employee-count · SEC EDGAR annual filings · As reported · Global consolidated headcount · As of 2026-03-31