Purpose: This paper aims to gather empirical evidence for what colleagues from different organizations reported they learned from informal professional learning conversations. Informal learning conversations with colleagues is a powerful yet understudied source of self-directed, professional development. Design/methodology/approach: This study of mixed methods investigated the types of learning 79 leaders from 22 organizations reported they learned via post-conversation surveys from 44 peer-led discussions over a two-year period. Findings: Survey data suggest empirical evidence of five learning outcomes--informational, conceptual, operational, reflective and social learning. The study describes these categories, the overall distribution of these types of learning in the community and how most conversations were "high-yielding" in a particular outcome. Originality/value: To the knowledge of the authors, this study is the first to suggest empirical evidence of categories of learning that participants report from informal, cross-organizational learning conversations.