VW's top shareholder Porsche SE to write down up to 20 billion euros on investment

BERLIN (Reuters) -Top Volkswagen shareholder Porsche SE expects to write down 7 billion to 20 billion euros ($20.98 billion) on its investment, it said on Friday, in the latest sign of how VW's cost crisis has shaken investor faith in the carmaker. It also expects an impairment on its investment in luxury carmaker Porsche AG, majority-owned by Volkswagen, of up to 2 billion euros, based on analyst expectations for the two companies.