In recent years, new technologies have led to disruption and change within most industries, resulting in the emergence of digitally-born start-ups. The purpose of this thesis is to complement the scarce theory about what the drivers of business model adaptation in start-ups consist of and how the adaptation process is managed to stay competitive. The findings not only provide theoretical contributions, but can also help managers to steer their start-upsthrough the growth phase.The research is set within the realms of business model theory in the strategic management field. An exploratory study with a qualitative, inductive approach was chosen to gain insights into the business model dynamics of nine firms from the fintech and healthtech ind...