Written by Alexander Crawford

Wish you could get an inside peek at your favorite companies? One idea is to look at trends in insider purchases, which indicates how employees feel about their company's prospects.

When company insiders, such as members of the board and upper management, purchase company stock, they report the transactions. Insider buying is viewed very positively by analysts because who knows the company better than its insiders?

To illustrate this, we ran a screen on the clean energy industry for stocks seeing significant net insider purchases over the last six months. This indicates that company insiders at these companies expect their employers to outperform. It may also indicate they believe these stocks to be undervalued.

Interactive Chart: Press Play to compare changes in market cap over the last two years for the first nine stocks mentioned below.



Business Section: Investing Ideas
Here below are the stocks resulting from this screen. These companies either use or produce sources of clean energy, and their insiders stand behind their companies' prospects.

Do you agree that these stocks are poised to outperform?

Use this list as a starting point for your own analysis. (Click here to access free, interactive tools to analyze these ideas.)

1. American Superconductor Corporation (Nasdaq:AMSC): Provides wind turbine designs and electrical control systems primarily in North America, Europe and the Asia-Pacific. Over the last six months, insiders were net buyers of 938,000 shares, which represents about 2.41% of the company's 38.85M share float.

2. China Recycling Energy Corporation (Nasdaq:CREG): Provides energy saving and recycling products and services in the People's Republic of China. Over the last six months, insiders were net buyers of 100,000 shares, which represents about 0.82% of the company's 12.21M share float.

3. FuelCell Energy Inc. (Nasdaq:FCEL): Engages in the development, manufacturing and sale of high temperature fuel cells for clean electric power generation primarily in South Korea, the United States, Germany, Canada and Japan. Over the last six months, insiders were net buyers of 180,000 shares, which represents about 0.14% of the company's 128.68M share float.

4. Federal Signal Corp. (NYSE:FSS): Designs and manufactures a suite of products and integrated solutions for municipal, governmental, industrial and commercial customers worldwide. Over the last six months, insiders were net buyers of 79,500 shares, which represents about 0.13% of the company's 60.06M share float.

5. Republic Services, Inc. (NYSE:RSG): Provides nonhazardous solid waste collection, transfer and disposal services in the United States. Over the last six months, insiders were net buyers of 7,694,475 shares, which represents about 2.53% of the company's 303.85M share float.

6. MEMC Electronic Materials Inc. (NYSE:WFR): Engages in the development, manufacture and sale of silicon wafers for the semiconductor industry worldwide. Over the last six months, insiders were net buyers of 355,195 shares, which represents about 0.15% of the company's 229.92M share float.

7. PROS Holdings, Inc. (NYSE:PRO): Provides pricing and margin optimization software worldwide. Over the last six months, insiders were net buyers of 8,500 shares, which represents about 0.04% of the company's 20.19M share float.

8. ShoreTel, Inc. (Nasdaq:SHOR): Provides Internet protocol (IP) telecommunications systems for enterprises in the United States. Over the last six months, insiders were net buyers of 112,509 shares, which represents about 0.24% of the company's 46.29M share float.

9. American Superconductor Corporation (Nasdaq:AMSC): Provides wind turbine designs and electrical control systems primarily in North America, Europe and the Asia-Pacific. Over the last six months, insiders were net buyers of 938,000 shares, which represents about 2.41% of the company's 38.85M share float.

10. The KEYW Holding Corporation (Nasdaq:KEYW): Provides mission-critical cybersecurity and cyber superiority solutions to defense, intelligence and national security agencies in the United States. Over the last six months, insiders were net buyers of 130,417 shares, which represents about 0.71% of the company's 18.48M share float

11. support.com, Inc. (Nasdaq:SPRT): Provides online care services for the digital home and small business primarily in North America. Over the last six months, insiders were net buyers of 299,467 shares, which represents about 0.78% of the company's 38.59M share float.

12. SRS Labs Inc. (Nasdaq:SRSL): Engages in the development and provision of audio and voice technology solutions. Over the last six months, insiders were net buyers of 13,125 shares, which represents about 0.17% of the company's 7.84M share float.

13. Amtech Systems Inc. (Nasdaq:ASYS): Engages in the design, assembly, sale and installation of capital equipment and related consumables used in the manufacture of wafers, primarily for the solar and semiconductor industries. Over the last six months, insiders were net buyers of 14,913 shares, which represents about 0.17% of the company's 8.93M share float.

14. Meru Networks, Inc. (Nasdaq:MERU): Engages in the development and marketing of a virtualized wireless LAN solution. Over the last six months, insiders were net buyers of 78,486 shares, which represents about 0.92% of the company's 8.53M share float.

15. Telestone Technologies Corp. (Nasdaq:TSTC): Offers wireless local-access network technologies and solutions primarily in the People's Republic of China. Over the last six months, insiders were net buyers of 73,902 shares, which represents about 0.82% of the company's 9.00M share float.

Use the Investopedia Stock Simulator to trade the stocks mentioned in this stock analysis, risk free!

Kapitall's Alexander Crawford does not own any of the shares mentioned above. Insider data sourced from Yahoo! Finance.

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