The latest issue of BusinessWeek has the Euro 50 list for this year. This list represents the top 50 European companies based on many factors such as profitability, sales growth,innovation, etc. These were picked from the S&P Europe 350 constituents which represent 350 of the big firms in Europe.
Out of this top 50 list, only 19 of them are available in the US as depository receipts for US investors. The table below lists those stocks:
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More info can be found here