The Dow Jones Industrials cratered 614.23 points, or 1.8%, to 34,178.53.
The S&P 500 skidded 76.21 points to 4,317.45.
The NASDAQ Composite turned away from gains and plunged 188.05 points, or 1.4%, to 12,986.61.
For this week, the Dow is down 0.07% and on pace for its third losing week in a row. The S&P is down 0.8% on the week and attempting to break a two-week losing streak. The NASDAQ is down 1.6% week to date, on track to post its third negative week in a row.
Companies reporting disappointing quarterly results led the market decline Friday. HCA Healthcare dropped 18% to become the worst-performing stock in the S&P 500. The decline came as the company posted weak full-year earnings and revenue guidance. The healthcare S&P 500 sector was also the biggest laggard among the 11 groups, down 2.8%.
Verizon shares fell 6% after the company reported a loss of 36,000 monthly phone subscribers in the first quarter.
Gap shares plunged 13% after the company announced the CEO of its Old Navy division, Nancy Green, is leaving the business this week
Treasury prices were slightly lower, pushing yields up to 2.9% from Thursday’s 2.89%. Treasury prices and yields move in opposite directions.
Oil prices subtracted $1.88 at $101.91 U.S. a barrel.
Gold prices dipped $14.30 to $1,933.90 U.S. an ounce.