A Single Source Partner for Information Management. Serving clients since 1999, OASIS Group is the largest privately owned Information Management company in Europe. Headquartered in Dublin, Ireland with almost 70+ locations across Belgium, Great Britain, Northern Ireland, Republic of Ireland, the Netherlands and Poland. OASIS employs over 1,700 Team Members & offers its services to over 11,500 clients throughout several industries with particular emphasis in the financial, legal, healthcare, government & educational sectors.