A sharp selloff in shares of Apple Inc. illustrates investor skepticism about its ability to navigate President Donald Trump’s tariffs on China, Vietnam and India — countries all critical to the iPhone maker’s supply chain.

Its shares have dropped 19% since last week’s tariffs announcement, marking the worst three-day stretch for Apple since 2001. The rout erased more than $637 billion in market value from the tech giant and sent a proxy for the stock’s volatility skyrocketing.