Apple shares slumped as fears continue to spread that the company could be in trouble with antitrust regulators.
The Nasdaq Composite Index fell 2.8% to 4,938.99, the worst start to the year for Apple since the company began trading in 1971.
The stock lost more than 30% of its value over the last year.
Markit data showed that Apple fell 1.5% to 5,822.55, the biggest drop in the Dow since the 2008 financial crisis.
Wall Street was down 2.5%.
Shares in the health care company Anthem Healthcare dropped 2.3% to $39.40.
The shares have been hit by a series of recent setbacks for the company, including a new hepatitis C vaccine that has made it one of the most expensive hepatitis drugs on the market, a high price for the product and competition from generic versions.
Anthem also has been hit with a patent infringement lawsuit from a company that sells its own hepatitis C vaccines.
The case has been consolidated into one in which the company argues that Anthem has infringed on its patent.
Shares of rival health care firm Humana fell 5.5%, while drug maker Pfizer fell 1% to close at $39 per share.
Apple shares fell as the latest antitrust fallout continued to weigh on investors.
The Nasdaq lost more ground after the company posted a quarterly profit, but the company still has a solid position in the market.
It is up about 11% this year.
“The big worry is going to be that this will drive down stock prices, and it may well drive the shares lower,” said Michael Maviglio, portfolio manager at BlackRock Investment Management.
“It’s still a reasonable price to buy, but we’ll see how it plays out in the longer term.”
Shares in Google (GOOGL) slumped more than 5% to a low of $6.90, while the shares of Facebook (FB) fell 3% to settle at $34.65.
The company’s stock is down nearly 11% over the past year.
Apple stock has been gaining momentum in recent months.
The iPhone maker has been on a buying spree, buying up huge numbers of shares in private companies and holding a massive array of debt.
Apple’s stock price has also been rising.
Last month, Apple reported that its revenue rose 9% in the quarter ended June 30, topping the prior record of 7% set in the fourth quarter of 2015.
Apple said its stock price is currently up about 25% this quarter compared to a year ago.