This paper reviews the prospects for a global public database on the tax contributions and economic activities of multinational companies.  It is divided into four main sections.  Firstly, we present a set of user stories, questions, requirements, and scenarios of usage for a database.  Secondly, we look at what kinds of information a public database could and should contain.  Thirdly, we look at the opportunities and challenges of building a public database drawing on various existing information sources.  Fourthly and finally, we suggest next steps for policy, advocacy, and technical work towards a public database...