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Live Earnings Conference Call: ClearSign Technologies will host a live Q1 2026 earnings call on May 20, 2026 at 5:00PM ET. Follow this link to get details and listen to ClearSign Technologies' Q1 2026 earnings call when it goes live. Get details.

ClearSign Technologies (CLIR) Short Interest Ratio & Short Volume

ClearSign Technologies logo
$4.64 +0.23 (+5.12%)
Closing price 05/19/2026 03:46 PM Eastern
Extended Trading
$4.51 -0.12 (-2.61%)
As of 05/19/2026 05:10 PM Eastern
Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Massive. Learn more.
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ClearSign Technologies Short Interest Overview

As of April 30, 2026, ClearSign Technologies (CLIR) had a short interest of 26,120 shares sold short, representing 0.51% of the public float. This marks a 0.34% increase in short interest since the prior report. The short interest ratio (days to cover) is 1.7, meaning it would take 1.7 days of the average trading volume of 15,422 shares to cover all short positions.

Current Short Interest
26,120 shares
Previous Short Interest
26,031 shares
Change Vs. Previous Month
0.34%
Dollar Volume Sold Short
$130.60 thousand
Short Interest Ratio
1.7 Days to Cover
Last Record Date
April 30, 2026
Outstanding Shares
5,410,000 shares
Short Percent of Float
0.51%
Today's Trading Volume
6,202 shares
Average Trading Volume
15,422 shares
Today's Volume Vs. Average
40%
Short Selling ClearSign Technologies?
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Short Interest ChartDays to Cover ChartShort Percent of Float Chart

CLIR Short Interest Over Time

CLIR Days to Cover Over Time

CLIR Percentage of Float Shorted Over Time

ClearSign Technologies Tesla Short Interest History & Recent Changes

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Report DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date
4/30/202626,120 shares $130.60 thousand +0.3%0.5%1.66 $5.00
4/15/202626,031 shares $152.02 thousand -42.9%0.5%0.24 $5.84
3/31/202645,549 shares $198.59 thousand -82.7%0.9%2.27 $4.36
3/13/2026263,955 shares $1.14 million +48.3%5.2%1.05 $4.33
2/27/2026177,980 shares $99.97 thousand +9.8%0.3%3.68 $0.56
2/13/2026162,090 shares $99.52 thousand +9.3%0.3%1.54 $0.61
1/30/2026148,329 shares $89.15 thousand -6.1%0.3%0.61 $0.60
1/15/2026158,030 shares $124.84 thousand +1.4%0.3%0.8 $0.79
12/31/2025155,825 shares $86.65 thousand -9.1%0.3%1.53 $0.56
12/15/2025171,348 shares $99.79 thousand +3.6%0.3%1.32 $0.58
11/28/2025165,396 shares $120.57 thousand -36.6%0.3%1.99 $0.73
11/14/2025260,901 shares $229.98 thousand +20.3%0.5%1.8 $0.88
10/31/2025216,873 shares $188.68 thousand -30.8%0.4%1.17 $0.87
10/15/2025313,400 shares $303.28 thousand -25.4%0.6%0.4 $0.97
9/30/2025419,800 shares $323.75 thousand +107.0%N/A0.6 $0.77
9/15/2025202,800 shares $107.52 thousand -5.1%N/A0.3 $0.53
8/31/2025213,700 shares $124.86 thousand -6.4%0.4%3.3 $0.58
8/15/2025228,200 shares $128.27 thousand +13.4%N/A3.5 $0.56
7/31/2025201,200 shares $116.09 thousand -6.7%0.4%3 $0.58
7/15/2025215,600 shares $113.19 thousand -4.6%N/A3.4 $0.53
6/30/2025226,000 shares $126.54 thousand +2.1%0.5%3.7 $0.56
6/15/2025221,300 shares $132.80 thousand +6.0%0.4%3.2 $0.60
5/31/2025208,800 shares $139.69 thousand -5.7%0.5%3 $0.67
5/15/2025221,400 shares $143.45 thousand +2.2%0.5%2.8 $0.65
4/30/2025216,600 shares $128.36 thousand -3.3%N/A2.6 $0.59
4/15/2025224,000 shares $132.18 thousand -2.7%0.5%2.5 $0.59
3/31/2025230,300 shares $172.73 thousand +5.4%0.6%2.1 $0.75
3/15/2025218,600 shares $176.02 thousand -4.2%0.5%1.8 $0.81
2/28/2025228,100 shares $173.08 thousand -15.2%0.5%1.7 $0.76
2/15/2025269,100 shares $269.10 thousand +9.5%0.6%1.8 $1.00
1/31/2025245,800 shares $299.88 thousand +2.9%N/A1.5 $1.22
1/15/2025239,000 shares $260.51 thousand -28.5%N/A1.4 $1.09
12/31/2024334,300 shares $481.39 thousand -1.6%N/A2.1 $1.44
12/15/2024339,700 shares $394.05 thousand +44.3%N/A2.8 $1.16
11/30/2024235,500 shares $277.89 thousand -5.1%N/A1.9 $1.18
11/15/2024248,100 shares $213.34 thousand -7.5%N/A2.3 $0.86
10/31/2024268,200 shares $231.32 thousand -3.2%N/A4.1 $0.86
10/15/2024277,100 shares $229.97 thousand -17.7%N/A6 $0.83
9/30/2024336,500 shares $285.99 thousand +27.2%N/A7.1 $0.85
9/15/2024264,600 shares $197.37 thousand -4.9%N/A3.6 $0.75
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8/31/2024278,200 shares $208.62 thousand -8.5%N/A3.7 $0.75
8/15/2024304,000 shares $221.77 thousand +4.9%N/A3.8 $0.73
7/31/2024289,700 shares $249.14 thousand -7.0%N/A3.5 $0.86
7/15/2024311,500 shares $258.58 thousand -19.0%N/A3.3 $0.83
6/30/2024384,500 shares $320.79 thousand +20.8%N/A4.3 $0.83
6/15/2024318,400 shares $229.25 thousand +25.3%N/A5 $0.72
5/31/2024254,200 shares $210.96 thousand -1.8%N/A4.2 $0.83
5/15/2024258,900 shares $212.30 thousand -20.7%N/A4 $0.82
4/30/2024326,300 shares $257.81 thousand +5.0%N/A4.9 $0.79
4/15/2024310,700 shares $277.92 thousand -5.6%N/A5.2 $0.89
3/31/2024329,100 shares $317.58 thousand +0.9%N/A5.5 $0.97
3/15/2024326,300 shares $319.74 thousand -6.1%N/A4.7 $0.98
2/29/2024347,300 shares $444.54 thousand +0.9%N/A4.2 $1.28
2/15/2024344,200 shares $347.64 thousand -12.1%N/A3.2 $1.01
1/31/2024391,600 shares $387.68 thousand +2.9%N/A3.6 $0.99
1/15/2024380,600 shares $433.88 thousand +10.3%1.2%3.7 $1.14
12/31/2023345,000 shares $382.95 thousand -2.2%1.1%3.4 $1.11
12/15/2023352,900 shares $419.95 thousand -5.4%1.2%4 $1.19
11/30/2023373,200 shares $462.77 thousand +6.7%1.2%4.5 $1.24
11/15/2023349,700 shares $292.87 thousand -12.8%1.1%5.7 $0.84
10/31/2023401,200 shares $326.98 thousand -3.3%1.3%8.2 $0.82
10/15/2023414,900 shares $435.65 thousand -7.4%1.4%8.3 $1.05
9/30/2023448,100 shares $488.43 thousand +10.1%1.5%8.9 $1.09
9/15/2023407,000 shares $373.99 thousand -7.8%1.3%7.8 $0.92
8/31/2023441,300 shares $507.50 thousand +5.6%1.4%9 $1.15
8/15/2023417,900 shares $409.29 thousand +4.9%1.4%7.2 $0.98
7/31/2023398,300 shares $521.77 thousand -8.6%1.3%6.3 $1.31
7/15/2023435,600 shares $592.42 thousand +6.0%1.4%7.1 $1.36
6/30/2023411,100 shares $538.54 thousand -2.8%1.3%6.2 $1.31
6/15/2023423,100 shares $520.41 thousand -4.8%1.4%6.7 $1.23
5/31/2023444,300 shares $679.78 thousand +21.8%1.5%7.6 $1.53
5/15/2023364,800 shares $435.94 thousand -2.2%1.2%8.6 $1.20
4/30/2023373,000 shares $395.38 thousand +7.5%1.2%11.7 $1.06
4/15/2023346,900 shares $336.18 thousand -5.1%1.1%11.4 $0.97
3/31/2023365,400 shares $291.59 thousand -0.6%1.2%11.6 $0.80
3/15/2023367,500 shares $279.30 thousand +0.1%1.2%10.2 $0.76
2/28/2023367,100 shares $296.21 thousand -2.0%1.2%7.3 $0.81
2/15/2023374,700 shares $288.52 thousand -1.9%1.2%7 $0.77
1/31/2023381,900 shares $282.64 thousand +4.3%1.3%6.7 $0.74
1/15/2023366,200 shares $248.91 thousand -11.0%1.2%6.2 $0.68
12/30/2022411,500 shares $220.56 thousand +5.6%1.4%6.9 $0.54
12/15/2022389,800 shares $262.69 thousand -3.7%1.3%7 $0.67
11/30/2022404,700 shares $277.75 thousand +2.4%1.3%8.2 $0.69
11/15/2022395,100 shares $269.66 thousand -3.4%1.3%9.3 $0.68
10/31/2022408,900 shares $338.90 thousand -6.2%1.4%8.8 $0.83
10/15/2022435,900 shares $342.75 thousand +2.0%1.4%8.9 $0.79
9/30/2022427,500 shares $392.45 thousand +5.3%1.4%8.2 $0.92
9/15/2022406,100 shares $507.63 thousand -3.1%1.4%8.2 $1.25
8/31/2022419,100 shares $414.91 thousand +0.4%1.4%8 $0.99
8/15/2022417,300 shares $475.72 thousand +0.7%1.5%7.1 $1.14
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7/31/2022414,400 shares $414.40 thousand +0.4%1.5%7.6 $1.00
7/15/2022412,700 shares $480.01 thousand -3.2%1.4%8.4 $1.16
6/30/2022426,500 shares $516.07 thousand 0.0%2.1%8.8 $1.21
6/15/2022426,600 shares $469.26 thousand -5.4%2.1%7.3 $1.10
5/31/2022450,900 shares $554.61 thousand -3.0%1.6%7.7 $1.23
5/15/2022464,900 shares $571.83 thousand +2.6%1.8%6.7 $1.23
4/30/2022453,100 shares $593.56 thousand +4.1%1.8%6.5 $1.31
4/15/2022435,400 shares $622.62 thousand -5.3%1.7%5.5 $1.43
3/31/2022459,800 shares $749.47 thousand -29.3%1.8%5.6 $1.63
3/15/2022650,400 shares $819.50 thousand -8.2%2.6%7.8 $1.26
2/28/2022708,300 shares $899.54 thousand +46.5%2.8%7.3 $1.27
2/15/2022483,600 shares $575.48 thousand -3.9%1.9%3.7 $1.19
1/31/2022503,400 shares $619.18 thousand -8.1%2.0%1.1 $1.23
1/15/2022547,800 shares $723.10 thousand -7.9%N/A1.2 $1.32
12/31/2021594,900 shares $820.96 thousand +0.6%2.3%1.3 $1.38
12/15/2021591,500 shares $822.19 thousand -6.3%2.3%1.2 $1.39
11/30/2021631,200 shares $1.05 million +46.5%2.5%1.3 $1.66
11/15/2021430,800 shares $766.82 thousand -6.3%1.7%0.9 $1.78
10/29/2021459,800 shares $744.88 thousand -1.8%1.9%3 $1.62
10/15/2021468,400 shares $875.91 thousand -11.6%1.9%3.6 $1.87
9/30/2021529,800 shares $1.06 million -19.1%2.1%4.2 $2.00
9/15/2021655,100 shares $1.46 million +36.7%2.6%5.9 $2.23
8/31/2021479,100 shares $1.50 million +0.6%1.9%4.4 $3.14
8/13/2021476,100 shares $1.75 million -4.2%1.9%6.5 $3.67
7/30/2021497,100 shares $2.04 million -3.1%2.0%6.4 $4.10
7/15/2021512,900 shares $2.15 million +0.4%2.1%4.8 $4.20
6/30/2021510,700 shares $2.45 million -0.9%2.1%4 $4.80
6/15/2021515,400 shares $2.63 million -6.2%2.1%3 $5.10
5/28/2021549,600 shares $2.70 million -10.6%2.2%3 $4.92

CLIR Short Interest - Frequently Asked Questions

Short interest is the volume of ClearSign Technologies shares that have been sold short but have not yet been closed out or covered. As of April 30th, investors have sold 26,120 shares of CLIR short. 0.51% of ClearSign Technologies' shares are currently sold short. Learn More on ClearSign Technologies' current short interest.

The short interest ratio, also known as the "days to cover ratio", is calculated by dividing the number of shares of a stock sold short divided by its average trading volume. A short interest ratio ranging between 1 and 4 generally indicates strong positive sentiment about a stock and a lack of short sellers. A short interest ratio of 10 or greater indicates strong pessimism about a stock. CLIR shares currently have a short interest ratio of 1.7. Learn More on ClearSign Technologies's short interest ratio.

Companies that have a short interest as a percentage of float below 10% indicates positive investor sentiment and few short sellers. Stocks with a short interest percentage above 10% is considered high, suggesting some investors are pessimistic about the stock. Companies with a short interest percentage of 20% or more indicates widespread negative sentiment. 0.51% of ClearSign Technologies' floating shares are currently sold short.

ClearSign Technologies saw a increase in short interest during the month of April. As of April 30th, there was short interest totaling 26,120 shares, an increase of 0.3% from the previous total of 26,031 shares. Changes in short volume can be used to identify positive and negative investor sentiment. Investors that short sell a stock are betting that its price will decline in the future. An increase in short sale volume suggests bearish (negative) sentiment among investors. A decrease on short sale volume suggests bullish (positive) sentiment.

0.51% of ClearSign Technologies' shares are currently sold short. Here is how the short interest of companies in the industry of "measuring and control equipment" compare to ClearSign Technologies: Optex Systems Holdings Inc. (0.98%), Odysight.ai Inc. (0.03%), Precipio, Inc. (0.48%), Data I/O Corporation (0.03%), Bionano Genomics, Inc. (10.22%), MultiSensor AI Holdings, Inc. (10.83%), Astrotech Corporation (5.19%), ScanTech AI Systems Inc. (8.35%), Trane Technologies plc (1.69%), Keysight Technologies Inc. (1.27%),

As of the most recent reporting period, the following stocks had the largest short interest positions: SPDR S&P 500 ETF Trust ($86.09 billion), Invesco QQQ ($39.89 billion), iShares Russell 2000 ETF ($26.13 billion), Western Digital Corporation ($12.66 billion), Salesforce Inc. ($12.29 billion), Sandisk Corporation ($11.87 billion), SPDR S&P Biotech ETF ($9.82 billion), Lumentum Holdings Inc. ($8.51 billion), iShares 20+ Year Treasury Bond ETF ($7.76 billion), and Bloom Energy Corporation ($7.40 billion). View all of the most shorted stocks.

Short selling CLIR is an investing strategy that aims to generate trading profit from ClearSign Technologies as its price is falling. CLIR shares are trading up $0.23 today. To short a stock, an investor borrows shares, sells them and buys the shares back on the public market later to return it to the lender. Short sellers are betting that a stock will decline in price. If the stock does drop after selling, the short seller buys it back at a lower price and returns it to the lender. The difference between the sell price and the buy price is the trader's profit.

A short squeeze for ClearSign Technologies occurs when it has a large amount of short interest and its stock appreciates in price. This forces short sellers to cover their short interest positions by buying actual shares of CLIR, which in turn drives the price of the stock up even further.

Short interest is typically published by a stock exchange once per month. However, NASDAQ publishes a report for U.S. stocks, including CLIR, twice per month. The most recent reporting period available is April, 30 2026.

Understanding short interest metrics can help you assess how traders are positioning around a stock like CLIR:

  • Shares Sold Short: The total number of shares that have been sold by short sellers but have not yet been covered or closed out. A high number may indicate bearish sentiment.
  • Short Float: The percentage of a company’s publicly available shares (or "float") that are sold short. A higher short float suggests a greater portion of the stock is being bet against.
  • Days to Cover (Short Interest Ratio): This estimates how many days it would take short sellers to cover their positions, based on average daily trading volume. Higher values can signal potential for a short squeeze if buying pressure increases.

These metrics are often used by traders to gauge sentiment, volatility risk, and the potential for price movements based on short covering activity.


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This page (NASDAQ:CLIR) was last updated on 5/20/2026 by MarketBeat.com Staff.
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