ClearSign Technologies Sees Surge in Short Interest

Shares of the clean energy tech company have seen increased short selling activity in recent weeks.

Mar. 30, 2026 at 1:24pm

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An extreme close-up of gears, valves, and other industrial components in a muted color palette, conveying the complex, mechanical nature of financial markets and investor sentiment.The rise in short interest on ClearSign Technologies' stock reflects growing investor skepticism about the clean energy company's future performance.Santa Rosa Today

ClearSign Technologies Corporation (NASDAQ:CLIR), a clean energy technology company specializing in advanced combustion solutions, has seen a significant increase in short interest during the month of March. As of March 13th, there was short interest totaling 263,955 shares, a growth of 48.3% from the February 26th total of 177,980 shares.

Why it matters

The rise in short interest could indicate that some investors are betting against the company's future performance, potentially signaling concerns about its technology or business outlook. However, short interest data alone does not provide a complete picture, and further analysis would be needed to determine the underlying reasons behind the increased shorting activity.

The details

Based on an average daily volume of 251,089 shares, the days-to-cover ratio is presently 1.1 days, meaning it would take short sellers about one day to cover their positions. Currently, 5.2% of the company's shares are short sold. Separately, Weiss Ratings has reiterated a 'sell (d-)' rating on ClearSign Technologies' shares.

  • As of March 13th, 2026, there was short interest totaling 263,955 shares.
  • This represents a 48.3% increase from the February 26th total of 177,980 shares.

The players

ClearSign Technologies Corporation

A clean energy technology company specializing in advanced combustion solutions that significantly reduce emissions of nitrogen oxides (NOx), carbon monoxide (CO), and greenhouse gases from industrial and power generation sources.

Weiss Ratings

A research firm that has reiterated a 'sell (d-)' rating on ClearSign Technologies' shares.

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The takeaway

The surge in short interest on ClearSign Technologies' stock could indicate that some investors are skeptical about the company's future prospects, though more analysis would be needed to fully understand the reasons behind the increased shorting activity.