This report explores how five European Mission cities - Lund, Leuven, Mannheim, Milan and Bratislava - are using multi-actor collaboration and private sector engagement as core governance mechanisms for advancing climate-neutrality implementation. Building on the first edition of NetZeroCities case work on multi-actor collaboration, the report extends the comparative analysis to a second set of city cases and focuses on the practical governance arrangements, instruments and engagement processes through which cities seek to mobilise companies and other non-state actors around Climate City Contract implementation.