John Ternus to Succeed Tim Cook

Ternus, who has been with Apple for 25 years, is known for his product-focused approach and calm management style.

He faces the daunting task of following Cook's highly successful 15-year tenure, which saw Apple become a $4 trillion company.

While Cook will transition to a global ambassador role, Ternus must now prove he can drive innovation in new categories like mixed reality.

Investors are closely watching for signs that the hardware expert can successfully navigate the company's shift toward AI-integrated services.