What is the 13F Pro Quality Score for CLIR?

13F Pro ranks ClearSign Technologies Corp (CLIR) on the 13F Pro Quality Score, a 0–100 composite of 32 fundamental signals including return on invested capital, free cash flow consistency, balance-sheet strength, earnings quality, growth durability, and valuation discipline. The score refreshes after each 10-K and 10-Q filing on SEC EDGAR. View CLIR's current score at https://13fpro.ai/research/CLIR (free sign-up required for the full ranking).

Where does 13F Pro source CLIR data?

All ClearSign Technologies Corp fundamentals and ownership data come directly from SEC EDGAR. ClearSign Technologies Corp files with the SEC under CIK 1434524. 13F Pro ingests XBRL financial facts from 10-K and 10-Q filings, Form 13F-HR institutional holdings, and Form 4 insider transactions, with no third-party rewrites or estimates.

What sector is CLIR in?

ClearSign Technologies Corp (CLIR) is classified in the Technology sector. 13F Pro publishes sector-level fund flow analysis and quality leaders at https://13fpro.ai/research/sector/technology.

How often is CLIR research updated on 13F Pro?

CLIR's fundamentals refresh within hours of each new 10-K or 10-Q filing on SEC EDGAR. Institutional ownership updates after each quarterly 13F filing window. Insider transactions update after each Form 4 filing. The 13F Pro Quality Score recalculates after every fundamentals refresh.

ClearSign Technologies Corp(CLIR)Stock Analysis

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13F Pro Quality Score

Not in ranked universe

Below size threshold

Quality rankings require at least $50M annual revenue or $250M total assets to filter out micro-caps and shell companies. This company reported $5.2M in revenue.

Financial data, filings, and institutional holdings below are still tracked in full — only the proprietary quality composite is unavailable for this name.

CLIR Stock Analysis & AI Quality Score

AI stock analysis and institutional research for ClearSign Technologies Corp (CLIR), a Technology sector company. CLIR is not currently included in 13F Pro's AI-ranked quality universe — quality rankings require at least $50m annual revenue or $250m total assets to filter out micro-caps and shell companies. this company reported $5.2m in revenue. Based on the latest XBRL financial filings (Q1 2026), ClearSign Technologies Corp reports quarterly revenue of $191.0K, net income of $-2.2M, free cash flow of $-1.3M. Top institutional holders of CLIR by reported 13-F value include VANGUARD CAPITAL MANAGEMENT, SIMON QUICK ADVISORS,, GEODE CAPITAL MANAGEMENT,, based on the most recent SEC filings. CLIR trades on the Nasdaq exchange and files with the SEC under CIK 1434524. 13F Pro's AI research platform runs 10 specialized AI analysts — value, growth, momentum, macro, and activist specialists — that debate CLIR daily and publish AI-generated analysis with cited SEC sources. The platform aggregates historical XBRL financial facts, 10-Q and 10-K filings, insider Form 4 transactions, and institutional 13-F holdings for ClearSign Technologies Corp directly from SEC EDGAR.

Revenue

Q1 2026

$191.0K

Net Income

Q1 2026

$-2.2M

Free Cash Flow

Q1 2026

$-1.3M

Revenue & Net Income

Earnings Per Share

Key Financials Over Time

Export Financial Table · Pro+

Revenue

+49.6% YoY

$3.6MFY 2024

FY20 $0.00FY22 $374.0KFY23 $2.4MFY24 $3.6M

Net Income

-2.0% YoY

$-5.3MFY 2024

FY20 $-6.9MFY22 $-5.8MFY23 $-5.2MFY24 $-5.3M

Operating Income

-8.5% YoY

$-6.5MFY 2024

FY20 $-6.9MFY22 $-6.1MFY23 $-6.0MFY24 $-6.5M

EPS (Diluted)

-730.8% YoY

$-1.08FY 2024

FY20 —FY22 $-0.16FY23 $-0.13FY24 $-1.08

Total Assets

+108.9% YoY

$15.9MFY 2024

FY20 $11.1MFY22 $10.9MFY23 $7.6MFY24 $15.9M

Total Debt

—FY 2024

FY20 $251.0KFY22 —FY23 —FY24 —

Op. Cash Flow

-35.3% YoY

$-4.4MFY 2024

FY20 $-6.0MFY22 $-5.0MFY23 $-3.2MFY24 $-4.4M

Metric	FY 2024	FY 2023	FY 2022	FY 2020	FY 2019	FY 2017
Revenue	$3.6M +49.6%	$2.4M +542.5%	$374.0K	$0.00	$0.00 -100.0%	$540.0K
Net Income	$-5.3M -2.0%	$-5.2M +9.8%	$-5.8M +16.4%	$-6.9M +18.8%	$-8.5M +12.4%	$-9.7M
Operating Income	$-6.5M -8.5%	$-6.0M +2.2%	$-6.1M +11.8%	$-6.9M +19.2%	$-8.6M +11.6%	$-9.7M
EPS (Diluted)	$-1.08 -730.8%	$-0.13 +18.8%	$-0.16	—	—	—
Total Assets	$15.9M +108.9%	$7.6M -30.3%	$10.9M -1.8%	$11.1M +1.6%	$10.9M +163.0%	$4.2M
Total Debt	—	—	—	$251.0K	$0.00	—
Operating Cash Flow	$-4.4M -35.3%	$-3.2M +35.2%	$-5.0M +16.3%	$-6.0M +13.6%	$-6.9M +16.4%	$-8.3M

AI Insight: CLIR Financial Trends

ClearSign remains unprofitable with negligible revenue and persistent cash burn; Q4 2025 spike to $4M revenue reversed in Q1 2026.

• Revenue collapsed from $4M in Q4 2025 to $0M in Q1 2026, erasing prior quarter gain.

• Net income improved to breakeven in Q4 2025 but deteriorated back to -$2M loss in Q1 2026.

• Operating cash flow remains negative across all periods, ranging from -$0M to -$2M per quarter.

⚠ Q4 2025 revenue spike to $4M lacks sustainability; immediate reversal to $0M suggests contract-driven noise, not commercial traction.

⚠ Balance sheet data unavailable (debt and equity blank); critical to assess runway given ongoing burn.

AI Insight: CLIR Ratio Trends

ClearSign swung to near-breakeven operating margins in Q4 2025 but deteriorated sharply into Q1 2026, signaling instability in path to profitability.

• Operating margin improved dramatically from -170.1% in Q3 2025 to -22.5% in Q4 2025, then collapsed to unmeasurable levels by Q1 2026.

• Net profit margin narrowed from -138.9% in Q3 2025 to -8.5% in Q4 2025, approaching breakeven before Q1 2026 data gap.

• ROA deteriorated from -10.2% in Q4 2025 to -89.1% in Q1 2026, the worst reading in the entire dataset.

⚠ Q4 2025 margin recovery may not be sustainable; Q1 2026 ROA collapse suggests seasonal weakness or operational disruption.

⚠ Persistent negative returns across all quarters; company remains unprofitable with no clear inflection to positive ROIC or ROE.

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Available Research

13F Pro tracks comprehensive data for ClearSign Technologies Corp including:

SEC EDGAR filings (10-K, 10-Q, 8-K)

XBRL financial facts (revenue, EPS, margins)

Insider transactions (Form 4)

Institutional 13F holdings

Quality rankings (32 signals)

AI analyst debates & daily meetings

Historical financial trends

Peer comparison & sector analysis

Top Institutional Holders of CLIR

VANGUARD CAPITAL MANAGEMENT LLC
$459.7K105,429 sh
SIMON QUICK ADVISORS, LLC
$263.0K60,314 sh
GEODE CAPITAL MANAGEMENT, LLC
$251.5K57,683 sh
Beacon Pointe Advisors, LLC
$118.5K27,173 sh
VANGUARD FIDUCIARY TRUST CO
$102.3K23,460 sh
BlackRock, Inc.
$85.0K19,503 sh
HighTower Advisors, LLC
$55.3K12,680 sh
Creative Planning
$53.9K12,355 sh
DDD Partners, LLC
$52.3K12,000 sh
SUSQUEHANNA INTERNATIONAL GROUP, LLP
$45.8K10,500 sh

Fund	Value	Shares
VANGUARD CAPITAL MANAGEMENT LLC	$459.7K	105,429
SIMON QUICK ADVISORS, LLC	$263.0K	60,314
GEODE CAPITAL MANAGEMENT, LLC	$251.5K	57,683
Beacon Pointe Advisors, LLC	$118.5K	27,173
VANGUARD FIDUCIARY TRUST CO	$102.3K	23,460
BlackRock, Inc.	$85.0K	19,503
HighTower Advisors, LLC	$55.3K	12,680
Creative Planning	$53.9K	12,355
DDD Partners, LLC	$52.3K	12,000
SUSQUEHANNA INTERNATIONAL GROUP, LLP	$45.8K	10,500

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Is CLIR a good stock to buy?

13F Pro's AI-powered analysis of ClearSign Technologies Corp (CLIR) draws on SEC EDGAR-sourced fundamentals, institutional 13F holdings, and insider Form 4 transactions in the Technology sector (listed on Nasdaq). The 32-signal AI Quality Score, current rank, and full bull/bear verdict for CLIR are available on the CLIR stock profile dashboard — with the same data, AI insights, ratios, and institutional activity refreshed after every 10-K, 10-Q, 13F, and Form 4 filing.

Which hedge funds own CLIR?

Institutional investors are required to disclose their holdings quarterly via SEC Form 13F. 13F Pro aggregates these filings to show which hedge funds, mutual funds, and asset managers are buying or selling CLIR. Combined with insider transaction data from Form 4 filings and AI-powered analysis from 10 specialized research agents, 13F Pro provides a comprehensive view of ClearSign Technologies Corp's investment landscape.