The International Baccalaureate (IB) is a market leader in international education however, research suggests that it predominantly serves elite populations (Bunnell, T., M. Donnelly, H. Lauder, and S. Whewall. 2020. "International Mindedness as a Platform for Class Solidarity." "Compare: A Journal of Comparative and International Education." Published online: 24 August 2020. doi:10.1080/03057925.2020.1811639). Drawing on data from the IB and the Australian government, we explore the growth of the IB in Australia for a period of 11 years (2008 to 2019). Data analysis highlights the narrow growth of the IB amongst relatively homogenous schools, suggesting a period of 'distinction and expansion' that represents a troubling contradiction of the IB's stated goal to increase diversity in IB schools and contributes to the reproduction of class disparity in Australia.