This chapter aims at raising a sense of reflectiveness regarding the use of the concept of “infrastructure” in the analysis of finance, through addressing different, if interconnected, problematizations of financial infrastructural reason. First, infrastructures are problematized as a modernist social imaginary that reproduces functionalist reasoning about society, thereby systematically effacing asymmetries and exclusions enabled by infrastructures. Second, infrastructural thinking is tightly coupled to conceptions of sovereignty and governability of populations, territories, and resources, thus inviting security thinking. Third, infrastructural reason in finance reproduces a globalist view on the international political economy together with a realist imaginary of international relations, modeled after a zero-sum game. Fourth, infrastructural reason in finance sidelines important political-economic critiques of the global financial economy, effectively correcting the imagery of the relationship between production base and financial economy. In conclusion, when using infrastructural reason to diagnose the present condition of the finance economies, it seems worthwhile to view infrastructures not so much as fungible, smoothly operating, and only in exceptional cases failing systems, but rather as leaky networks through which shocks, disruptions, and exclusions are disseminated.