SoftBank briefly overtook Toyota as Japan's most valuable company for the first time since February 2000. Kioxia went from 154th to top three in a year. Is the AI rally 2000 repeating?

SoftBank’s Masayoshi Son powers up with a multibillion dollar bet on OpenAI to reclaim the top spot.

The artificial-intelligence boom is rewriting which companies define corporate Japan. The memory-chip maker Kioxia briefly passed Toyota to become the country's