MarketsAmount triples over past decade on rising stock prices and expansion of individual investorsThe Master Trust Bank of Japan, a Mitsubishi UFJ Trust and Banking affiliate, holds assets on behalf of institutional investors. (Source photos by Akira Kodaka and Shotaro Mori)TAKERO MINAMIAugust 28, 2026 13:48 JSTTOKYO -- Japan's pool of investment assets is expanding rapidly, propelled by a historic stock market rally and the expansion of NISA, the government's tax-advantaged investment program.