Initially launched in 2017, the OECD annual Blended finance Funds and Facilities Survey compiles and analyses information on collective investment vehicles, one of the primary channels for blended finance. In 2020, the third annual edition captured 198 vehicles, representing USD 75 billion assets under management. The survey helps policy makers and private sector actors better grasp the size and shape of a segment of the blended finance market. By bringing together data of different development actors that, collectively, are a significant contributor to sustainable finance, this survey makes an important contribution to enhancing understanding and transparency. Transparency is increased through the data collection and analysis, and understanding is increased through the aggregation of the data that highlight the main investments trends. The quantitative analysis is complemented by OECD statistics on private finance mobilised by official development interventions, as well as by information provided by other specialised institutions. This new evidence confirms trends observed on the broader blended finance market in terms of priority sectors, geographical coverage and the Sustainable Development Goals targeted. This year’s edition also explores additional aspects such as investors, clients and investment instruments, and has a particular focus on gender.