Most of Kazakhstan's wealth hinges on oil rents, and the overall performance of the economy is closely linked to petroleum's price fluctuations. This study asks (1) why the institution of private ownership of oil proceeds has not led to a positive transformation of patron-client relations embedded in the country's energy sector, thus challenging the relevance of the 'private ownership' narrative, and (2) why the collapse in the price of oil did not affect the stability and essential character of the regime in power. To answer these questions, the article examines two case studies: the privatization of the oil sector in the 1990s, and the post-2014 oil crisis. Thus the article problematizes important theories on oil-sector privatization and contributes to recent work on regime stability as it pertains to the resource curse. The analysis of the constitutive impact of oil wealth on Kazakh politics generates wider insights on the links between the power of informal networks and regime stability in petrostates through boom and bust cycles.