The Dow Jones Industrial Average dropped 6,300 points after the US Federal Reserve on Friday announced it would hike interest rates.
The Dow fell 5,900 points on Friday morning, and then dropped 4,000 more points within minutes, after the central bank’s announcement.
The Dow is down more than 13,000 since mid-December.
The market’s slide has been fuelled by worries over the global economy, with worries that the US economy will slow to a crawl as unemployment rates remain stubbornly high.
The economy has grown more slowly in the first three months of the year than in the previous three years, and the number of Americans out of work has surged.
The US has been buffeted by a wave of storms and hurricanes.
In particular, Hurricane Harvey has devastated parts of Texas, Florida, Oklahoma and Florida.
It has claimed at least 13 lives and left more than 100,000 people without power.
Meanwhile, a number of other major markets have also seen major falls in the past few days, including the UK, which fell 4,600 points, the US and Canada, and Japan.
In Ireland, the Dow has fallen 6,500 points since mid December, after falling more than 14,000 over the last three months.
The Irish stock market was up by 6,200 points in early January.