Investors looking for buys in the clean energy space may start with these six stocks, which have seen insider buying in earnest in recent months.

Today we present a list of six clean energy companies that have seen significant insider buying over the last six months, with increases in insider ownership above 2%.

If you're interested in clean tech, this list might offer an interesting starting point for your own analysis.

American Superconductor Corporation (AMSC) is in the diversified electronics industry and has a market cap of $733.63 million.

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Net shares purchased by insiders at this company over the last six months totaled 1,508,478 shares, which represents a 28.4% increase in insider ownership.

However, the stock is a short squeeze candidate, with a short float at 23.29% (equivalent to 6.95 days of average volume). The stock is currently stuck in a downtrend, trading 39.33% below its 20-day simple moving average (SMA), 44.84% below its 50-day SMA, and 51.78% below its 200-day SMA.

It's been a rough couple of weeks for the stock as well, having lost 42.28% in recent weeks.

US Ecology, Inc. (ECOL) is in the waste management industry and has a market cap of $335.81 million.

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Net shares purchased by insiders over the last six months total 19,623 shares, which represents a 6.4% increase in insider ownership.

Calgon Carbon Corporation (CCC) is in the pollution and treatment controls industry and has a market cap of $925.78 million.

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Net shares purchased by insiders over the last six months total 40,095 shares, which represents a 5.1% increase in insider ownership. The relatively low correlation to the market (beta = 0.76) may be appealing to risk-averse investors.

The stock is a short squeeze candidate as well, with a short float at 8.1% (equivalent to 6.26 days of average volume). It’s exhibiting strong upside momentum, currently trading 8.43% above its 20-day SMA, 12.55% above its 50-day SMA, and 15.49% above its 200-day SMA.

The stock has had a good month, gaining 17.73%.

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MEMC Electronic Materials Inc. (WFR) is in the semiconductor industry with a market cap of $2.87 billion.

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Net shares purchased by insiders over the last six months total 12,300 shares, which represents a 3.3% increase in insider ownership. The stock has lost 20.27% over the last year.

MGE Energy Inc. (MGEE) is in the diversified utilities industry with a market cap of $963.92 million.

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Net shares purchased by insiders over the last six months total 1,780 shares, which represents a 3.0% increase in insider ownership.

There’s a relatively low correlation to the market (beta = 0.3), which may be appealing to risk averse investors. The stock offers a good dividend and appears to have good liquidity to back it up (dividend yield at 3.6%, current ratio at 2.0, and quick ratio at 1.42).

The stock has gained 20.65% over the last year.

Republic Services, Inc. (RSG) is in the waste management industry with a market cap of $11.63 billion.

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Net shares purchased by insiders over the last six months total 1,732,695 shares, which represents a 3.0% increase in insider ownership. The stock has gained 4.38% over the last year.

By the Staff at Kapitall.com