What do Hewlett-Packard, Dell, Intel and IBM have in common, besides being companies that deal with computers as their core businesses? They are in the Top 5 list of Newsweek Green Ranking for 2009-2010. The four companies from the technology sector came in 1st, 2nd, 4th and 5th respectively. The only non-technology company to make it into the Top 5 is Johnson and Johnson.

Newsweek ranked the companies based on the Green Score each company obtained. The score is based on 3 components – Environmental Impact Score, Green Policies Score, Reputation Scores. For the full list of the Top 500 Green US Companies in Newsweek’s inaugural Green Ranking, please click here. To find out more about the methodology used for the scoring and ranking, click here.

Besides Newsweek’s list, Forbes also has it’s own list – of the Global 100 Most Sustainable Corporations, available here. Different from Newsweek’s ranking, the corporations in Forbes’ list comprises international companies and are scored based on Strategic Governance, Human Capital, Environment and Stakeholder Capital.

Another list you might want to conside is the Dow Jones Sustainability Indexes, compiled in collaboration with SAM. Details are availabe here.