The Nikkei 225 reached its all-time closing peak before Japan’s post-1989 market crash on December 29, 1989. The index closed that day at 38,915.87, marking the high point of Japan’s late-1980s asset-price bubble.
The peak followed years of extraordinary increases in Japanese share and land prices. Easy credit, strong optimism, and speculative buying pushed valuations to levels that later proved unsustainable. After the bubble began to deflate, Japanese equities fell for years, while banks and companies struggled with bad loans and declining asset values.
The Nikkei’s record is sometimes confused with an intraday high. The index’s record intraday level was 38,957.44, also reached on December 29, 1989, but the closing peak was 38,915.87. The distinction matters because financial indexes can finish below their session highs. The Nikkei eventually fell far below its 1989 level before recovering over subsequent decades.