Design software developer Autodesk, Vestas, the East Japan Railway and Henkel are among the firms that have made the Top 10 Green Companies list compiled by global mutual fund Portfolio 21.

Based in Portland, Oregon, Portfolio 21 focuses on firms that have demonstrated a commitment to environmental business practices.

The fund currently invests $323 million in 105 companies across 20 countries.

Its recently announced leading picks for 2010 range from the Danish wind energy company Vestas and Autodesk to Brazilian cosmetics firm Natura Cosmeticos.

Here is Portfolio 21's top 10 roster for this year in alphabetical order, along with some of the key reasons the fund cited for placing the companies on the list:

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