[Kioxia Hits Another All-Time High, Becomes Japan's Most Valuable Company, Up 807% Year-to-Date] According to Golden Finance, on June 16, Japanese storage giant Kioxia closed up more than 4% today at ¥97,420, marking another all-time high. Its market capitalization reached ¥51.75 trillion, solidifying its position as Japan's most valuable company. Kioxia has surged 807% year-to-date.