The leaders of Germany's Social Democrats and Merkel's conservative bloc agreed on the measure at a late-night meeting yesterday. A bill will be put to Cabinet on Dec 11, she said.
Currently, women hold just 22 per cent of non-executive positions on the boards of companies listed in Germany's benchmark DAX 30 index, according to Economy Ministry figures.
They hold just six per cent of management board posts.
Introducing a women's quota was one of the center-left Social Democrats' demands for entering into a coalition with Merkel's conservatives.
Germany has lagged far behind other European countries in terms of female representation in the boardroom. Norway, Spain, Iceland and France already have similar quota requirements.
