Marubeni Corporation, a major trading company in Japan, reported that the aluminum stocks at Japan's three major ports totaled 331,000 tons as of the end of May, growing by 3.3% compared to the previous month. This figure hit a new high since October last year.

Among them, the stock in the Yokohama Port was 143,900 tons, up from 134,300 tons in the previous month; that in the Nagoya Port was 167,900 tons, increasing from 167,500 tons recorded last month; that in the Osaka Port was 19,200 tons, rising from 18,500 tons in the previous month.