Dow skids 300 points
This is a breaking news story. Please check back for updates.
U.S. stocks traded sharply lower on Friday, following a global decline in equities on renewed Greece concerns and new Chinese trading regulations.
The major averages had their worst day since March 25.
Read More Shares hit by China trading clampdown fears
"I think what's more market moving (than domestic data) is Europe and concerns about Greece, and the put trading rules (in) China," Jim Meyer, chief investment officer at Tower Bridge Advisors.
Read More S&P to start its correction today, analyst warns
More From CNBC