Primary elections are a new element in the ‘periodical table’ of Hungarian politics and were already used for the selection candidates in some instances in 2019. In preparation for the upcoming parliamentary elections in 2022, a cooperation scheme is taking shape among opposition parties, involving all currently decisive players on that political side. Entailing a scope broader than ever before, this cooperation also involves the organisation of primary elections for selecting the candidate for the Prime Minister and the candidates in single-member constituencies. The primaries are organised by the six opposition parties running together in the 2022 Hungarian parliamentary election. If held, it would be the first countrywide primary election in Hungary. This study looks beyond the specific solutions that may be applied in relation to the upcoming primaries. It provides a working definition of the term itself, briefly reviews the international and Hungarian antecedents of primaries, also outlining the reasons why this solution came to the fore in Hungary. Then the study sets out to predict the ‘evolutionary trajectory’ along which primary elections will become institutionalised here, spelling out the potential phases of development. In the latter context, this paper touches on the private law and public law implications of primaries and raises a scenario in which government parties also begin to apply this new political tool.