How did outgoing CEO Tim Cook take Apple from $350 billion to $4 trillion?

Under Tim Cook, Apple's market capitalisation has surged from around $350 billion to nearly $4 trillion, while its stock has risen almost 25-fold. The growth has been driven by resilient iPhone demand, rapid expansion of its services business and continued global expansion. Services such as the App Store, Apple Music and Apple Pay have increasingly emerged as key growth engines.