In a complex global production landscape, the quest for measures of economic activity by multinational enterprises (MNEs) has become more pressing. Foreign Direct Investment (FDI) statistics, which capture financing aspects of MNEs, have often been used as a proxy for multinational production given their wide availability and cross-country comparability, but concerns that multinational production occurs in different countries than where financial positions are recorded call this practice into question. This paper revisits the main objections to the use of FDI as a proxy for multinational production, explores counterarguments, and provides guidance on the use of FDI statistics to measure multinational production.