Which stock exchange index lost about 80% during the 2001 dot-com crash?

The NASDAQ Composite lost about 80% during the collapse of the dot-com bubble.

The technology-heavy index peaked at 5,048.62 on March 10, 2000, after years of enthusiasm for internet companies. Investors often valued firms on website traffic, projected growth, or a promising domain name rather than profits and established cash flows.

As interest rates rose and many businesses failed to meet expectations, technology shares began falling. The decline continued through 2000 and 2001, and the NASDAQ eventually reached a bear-market low in October 2002. The fall from its peak was approximately 78%, commonly rounded to about 80%.

The crash did not eliminate the internet economy. Companies with durable business models eventually benefited from online commerce and digital advertising, while many speculative firms disappeared. The NASDAQ later surpassed its 2000 peak in 2015.