Epistemic practices are an important but underappreciated component of business ethics; good conduct requires making epistemically sound as well as morally principled judgments. Well-founded judgments are promoted by epistemic virtues, and for organizations, epistemic virtues are arguably achieved through organizational good epistemic practices. But how are such practices to be developed? This paper addresses this normative and practical challenge. The first half of the paper explains what organizational good epistemic practices are and outlines a means for their construction. The second (...) half of the paper demonstrates how specific good epistemic practices could be developed by considering a case of corporate epistemic failings: JPMorgan’s notorious 2012 ‘London Whale’ trading losses. Following this, the paper briefly surveys the institutional epistemic failings of the 2008 global financial crisis and the remedial actions that they suggest. Although the discussion is focused on the banking industry, the main ideas, and some of the epistemic practices, generalize to organizations in other industries. (shrink)