ClearSign Technologies Reports Significant Decline in Short Interest

Short interest in the company's stock dropped 82.7% in March, indicating reduced bearish sentiment.

Apr. 11, 2026 at 4:40pm

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An extreme close-up of gears, valves, and other heavy industrial components, representing the complex financial infrastructure and mechanics behind ClearSign Technologies' clean energy innovations.The dramatic, physical details of ClearSign's innovative clean energy technology hint at the complex financial machinery powering the company's growth.Santa Rosa Today

ClearSign Technologies Corporation (NASDAQ:CLIR), a clean energy technology company, saw a significant decline in short interest in its stock during the month of March. As of March 31st, the short interest totaled 45,549 shares, down 82.7% from the 263,955 shares reported on March 15th. This indicates reduced bearish sentiment towards the company among investors.

Why it matters

The drop in short interest suggests that investors are becoming more bullish on ClearSign Technologies and its clean energy technology offerings. This could signal increased confidence in the company's future prospects and the potential for its proprietary burner and sensor platforms to gain traction in the market.

The details

ClearSign Technologies' short interest declined from 263,955 shares on March 15th to 45,549 shares on March 31st, a decrease of 82.7%. This means that only 0.9% of the company's shares are currently being sold short. Based on the average daily trading volume of 20,065 shares, the short-interest ratio is now 2.3 days, down from a previous level that would have taken over 13 days to cover.

  • As of March 31st, 2026, ClearSign Technologies had a short interest of 45,549 shares.
  • On March 15th, 2026, the company's short interest was 263,955 shares.

The players

ClearSign Technologies Corporation

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

Northwestern Mutual Wealth Management Co.

An investment management firm that has recently increased its stake in ClearSign Technologies, raising its position by 895.3% during the second quarter.

Americana Partners LLC

An investment firm that has also increased its position in ClearSign Technologies, raising its stake by 83.3% during the fourth quarter.

Renaissance Technologies LLC

A hedge fund that has increased its position in ClearSign Technologies, adding 36,769 shares during the fourth quarter.

Rockefeller Capital Management L.P.

An investment management firm that has significantly increased its stake in ClearSign Technologies, adding 72,200 shares during the fourth quarter.

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What they’re saying

“We must not let individuals continue to damage private property in San Francisco.”

— Robert Jenkins, San Francisco resident

“Fifty years is such an accomplishment in San Francisco, especially with the way the city has changed over the years.”

— Gordon Edgar, grocery employee

The takeaway

The significant decline in short interest in ClearSign Technologies' stock suggests that investors are becoming more optimistic about the company's clean energy technology offerings and its potential to gain traction in the market. This could signal increased confidence in the company's future prospects and the potential for its proprietary solutions to drive growth.