Amid public critiques of Wall Street's amorality and protests against sharpening inequality since the financial crisis of 2008, the emergent discourse of philanthrocapitalism – philanthropic capitalism – has sought to recuperate a moral centre for finance capitalism. Philanthrocapitalism seeks to marry finance capital with a moral commitment to do good. These strategies require new financial instruments to make poverty reduction and other forms of social welfare profitable business ventures. Social impact bonds (SIBs) – which offer private investors competitive returns on public sector investments – and related instruments have galvanized the financialization of both public services and the life possibilities of poor communities in the USA and the Global South. This article maps new intrusions of credit and debt into previously unmarketable spheres of life, such as prison recidivism outcomes, and argues that contemporary social finance practices such as SIBs are inextricable from histories of race – that financialization has been and continues to be a deeply racialized process. Intervening in debates about the social life of financial practices and the coercive creation of new debtor publics, we chart technologies meant to transform subjects considered valueless into appropriate, even laudable, objects of financial investment. Because their proponents frame SIBs as philanthropic endeavours, the violence required to financialize human life becomes obfuscated. We aim to historicize the violence of financialization by drawing out links between financial capitalism as it developed during the height of the Atlantic slave trade and the more subtle violence of philanthropic financial capitalism. Though the notion that slaves could be a good investment – both in the profitable and moral sense of the word – seems far removed from our contemporary sensibilities, the shadow of slavery haunts SIBs; despite their many differences, both required black bodies to be made available for investment. Both also represent an expansion to the limits of financialization.