3% aluminium stock rise in Japan, coupled with Q3 premium drop, signals market softening

Japanese general trading house Marubeni Corp reported that aluminium inventories at Japan’s three major ports (Yokohama, Nagoya, and Osaka) increased for the second consecutive month. As of the latest end of May data, the stocks rose to 331,000 metric tonnes, marking an increase of 3.3 per cent from April 2025.

Continued increase in stocks in addition to premium drop underscores the ongoing weakness in aluminium demand in the Asian country. Moreover, the recent news reporting 0.2 per cent GDP shrinkage in Japan, albeit better than the initial estimation, further reflects the subdued market sentiment.
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