Which stock index lost about 89% of its value from its 1929 peak to its 1932 low?

The Dow Jones Industrial Average lost about 89% from its 1929 peak to its low in July 1932.

The decline followed the Wall Street Crash of 1929 and unfolded over several years rather than in a single trading session. The Dow peaked at 381.17 on September 3, 1929, before falling amid bank failures, shrinking credit, falling industrial production, and worsening economic confidence.

By July 8, 1932, the index had reached 41.22. That represented a decline of roughly 89% from its 1929 peak and marked the worst point of the bear market associated with the Great Depression.

The 1929 crash and the wider Great Depression are related but not identical events. The crash was a dramatic market collapse, while the Depression was a broader, international economic crisis lasting through much of the 1930s. The Dow eventually recovered its pre-crash closing high in 1954.