Martha O'Hagan Luff is an Assistant Professor of Finance in Trinity College Dublin, and the Director of the MSc in Law and Finance. She holds a BA in Economics, an MSc in Finance and a PhD in International Finance from Trinity College. Her research interests are in the areas of Home Bias in Equity Investments, Entrepreneurship and Sustainable Finance. She has published articles in many journals including the International Business Review, International Journal of Finance and Economics and Small Business Economics. Prior to completing her PhD she worked in Investment Banking in London and Dublin, for Bank of America, Credit Suisse First Boston and Bank of Ireland Global Markets. Her area of specialisation was derivatives and financial engineering.
This paper uses a twenty-year data set of all publicly listed US firms from 1995 to 2014 to create a unique measure of both the extent and the scope of firm-level multinationality.