»Cross-Border Conversions within the European Union with Special Consideration of Directive (EU) 2019/2121 and its Implications for Partnerships«: This dissertation is dedicated to review the newly harmonized legal framework for cross-border conversions within the European Union. At the same time, this harmonization progress is taken as an opportunity to examine the non-unified law of cross-border conversions of partnerships de lege lata and to point out the implications of the Mobility Directive for this form of transformation. Finally, the thesis documents the persisting obstacles to mobility in the internal market and proposes solutions, especially at the level of conflict of laws, to promote corporate mobility.