Aid transparency has come a long way since the launch of the International Aid Transparency Initiative (IATI) at the Accra High-Level Forum on Aid Effectiveness in 2008. At present, 601 organisations are publishing to the IATI Standard. This report assesses the current status of US development co-operation transparency efforts, focusing on US aid to Ghana during 2013–2015, and the extent to which IATI allows users to trace the flow of aid funds from the US Treasury to their final end use. Such information can help the Ghanaian government to hold donors such as the US accountable and to be accountable to its own citizens. We focus on aid to Ghana because of Oxfam’s long-term focus on aid effectiveness in that country.