In a stock-market filing days into the new year, the US fund manager Harding Loevner highlighted a company that was one of its top performers. That company was Keywords Studios, the Irish video game services giant. The praise was accompanied by a note that said Harding Loevner had since exited its holding in the company. That’s because Keywords Studios, in the preceding weeks, had just closed its €2.5 billion acquisition by private equity firm EQT. The deal saw Keywords Studios exit the stock market and become a privately held company again; the many investors that took a punt on the…