The company counts on the sale of devices for three-quarters of its nearly $400 billion in annual revenue, and it makes almost all of its iPhones, iPads and Macs overseas.

U.S. tech stocks tumbled in early Friday trading, extending one of the worst days for the Nasdaq in five years, as China hit back at President Donald Trump's sweeping global tariffs with new levies that look set to trigger a damaging trade war between the world's two biggest economies.

The added cost of tariffs will cost Apple more than $33 billion a year, or 26% of its fiscal 2025 operating profits, according to Morgan Stanley.