Photographer: Alex Kraus/Bloomberg In Germany, some small investors who lost everything on companies on the verge of insolvency are complaining that they haven’t been allowed to put more money into the collapsed businesses. Battery maker Varta AG, auto supplier Leoni AG and communications-equipment company Mynaric AG all used a relatively new process known as StaRUG in the past few years to restructure their debts. Most Read from Bloomberg In each case, stockholders were wiped out and, when it came ti ...