Shoppers test products at an Apple Store outside of Phoenix. (Eduardo Barraza/Zuma Press)

The tech giants that powered the stock market for the past two years were among the hardest hit this week in this week’s big selloff.

The damage wasn’t evenly spread. Apple shares shed 16% of their value over two days—Thursday and Friday— as the company draws the bulk of its business from hardware manufactured in countries like China that were hit with steep tariffs.

By contrast, Microsoft’s shares were down less than 6% for the two-day period. The corporate software and cloud computing services that make up the bulk of its business are less exposed to tariffs in general.