  We determine all 5d SCFTs upto rank three by studying RG flows of 5d KK
theories. Our analysis reveals the existence of new rank one and rank two 5d
SCFTs not captured by previous classifications. In addition to that, we provide
for the first time a systematic and conjecturally complete classification of
rank three 5d SCFTs. Our methods are based on a recently studied geometric
description of 5d KK theories, thus demonstrating the utility of these
geometric descriptions. It is straightforward, though computationally
intensive, to extend this work and systematically classify 5d SCFTs of higher
ranks (greater than or equal to four) by using the geometric description of 5d
KK theories.
