After years of uncertainty, including delayed listings, memory chipmaker Kioxia's shares soared 56x in 18 months, making it Japan's most valuable company (Shuhei Ochiai/Nikkei Asia)

Shuhei Ochiai / Nikkei Asia:
After years of uncertainty, including delayed listings, memory chipmaker Kioxia's shares soared 56x in 18 months, making it Japan's most valuable company  —  TOKYO — Japanese memory maker Kioxia Holdings is now the top Japanese company by market capitalization, capping off a dramatic period …