There is much difference between EU member states, with females making up 27 percent of board members in large Finnish companies and only three percent in those of Malta.
The proposal was jointly presented by several vice presidents of the Commission, including Viviane Reding, Antonio Tajani, Joaquin Almunia and Olli Rehn.
It came after months of reluctance from several EU member states led by the UK and still needs the approval from the Parliament and the EU Council.
Of the 26 commissioners, only about one third are females.
The Parliament has repeatedly called for legislation on equality between men and women in business leadership, while a dozen of EU member states already have relevant legislation.
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