On a day when the Dow Jones Industrial Average lost 530 points and 3 percent of its value, investors were particularly unkind to tech giant Apple.

The firm managed to ride a bull market to new heights in recent years, becoming the United States’ most valuable company during that time. But now, the pendulum is swinging the other way, and the market’s dramatic sell-off on Friday took a heavy toll on the iPhone and iPad maker.

Apple’s stock price fell $6.72, or a full 6 percent, to close at $106.02. In all for the week, Apple’s losses were 8.5 percent, making it the worst performer in what is turning out to be an ugly stock market, USA Today reported.

By the closing bell at Friday’s session, $158 billion in Apple valuation simply vanished.