GLS Grup A.S. Hoca Nasrettin Str. 28 , Istanbul , 34776 About Solutions products industries services Home Companies GLS Grup A.S. Locations GLS Grup A.S. Show or hide locations in map Headquarters Office locations Locations served Distributors Manufacturer GLS Grup A.S. Headquarters Hoca Nasrettin Str. 28 Istanbul 34776 Phone/Fax Number