This paper examines the key learning processes of high growth firms including gazelles, scale-ups, superstars, and mature HGFs. By studying ten high-growth firms in Europe considering different institutional contexts we investigate the evolution of learning processes and their role in the transitions typical of scaling-up processes. Through theory elaboration and data analysis, we develop an emergent theoretical framework for understanding learning and unlearning transitions in scaling-up contexts. Our findings show that managing learning transitions are essential for the learning and unlearning that underpin activity of these ventures as they grow. Responding to recent calls, our work enriches the understanding of high growth firms with a focus on learning processes.