(Bloomberg) — Star U.K. stock picker Alexander Darwall’s investment trust slumped as its biggest holding went into freefall amid accounting concerns.Wirecard AG accounted for just over 10% of the European Opportunities Trust Plc’s investments as of May 31, according to the website of Devon Equity Management, where Darwall is chief investment officer.When the German payments firm delayed the release of its annual report for a fourth time on Thursday, shares in Darwall’s trust fell 11.6%. That was the biggest daily drop since 2008.Devon’s Chief Executive Officer Richard Pavry declined to comment.Darwall built his reputation over almost a quarter century at […]