The relationship between academic freedom and freedom of speech features prominently in public and political discussions concerning the role of universities in Western liberal democracies. Recently, these debates have attracted increased attention, owing in part to media framing of a ‘free speech crisis’, especially in UK and US universities. One type of response is to regulate academic expression through legislation, such as the UK’s 2023 Higher Education (Freedom of Speech) Act. This article offers a critical analysis of the assumptions concerning (...) the performativity of speech in this kind of legal intervention. It extends Judith Butler’s discussion of the concept of ‘harmful speech’ (Excitable speech: a politics of the performative, Routledge Classics, London, 1997) to conceptualize speech-acts as performative not only when it comes to populations, but also when it comes to institutions. Reconceptualizing universities as producing as well as being constituted by speech-acts, the article argues that the effects of free speech legislation need to be considered in the context of the transformation of universities and other political actors (including governments and student unions) in the second half of the twentieth and the beginning of the twenty-first century. It argues that legal enforcement of free speech at universities further obscures the distinction between negative and positive liberties identified by Isaiah Berlin (Two Concepts of Liberty, Oxford University Press, Oxford, 1958), and considers this shift as part of the reconfiguration of political ontology in late modernity. (shrink)