We use a new firm level data set that establishes the location, ownership, and activity of 650,000 multinational subsidiaries-close to a comprehensive picture of global multinational activity. A number of patterns emerge from the data. Most foreign direct investment (FDI) occurs between rich countries. The share of vertical FDI (subsidiaries which provide inputs to their parent firms) is larger than commonly thought, even within developed countries. More than half of all vertical subsidiaries are only observable at the four-digit level because the inputs they are supplying are so proximate to their parent firms' final good that they appear identical at the two-digit level.