Aluminum stocks in Japan's main port warehouses rose 13.5% year on year to 314,500 mt in January, which was alsoabove the usual stock level of around 250,000 mt, Japanese trading house Marubeni said Wednesday.
The total stock level was, however, down 0.7% compared with December.
Supplies at Yokohama inched up 0.27% month on month to 151,100 mt, but slipped 1.8% at Nagoya to 148,400 mt.
Osaka stocks were stable at 15,000 mt.
Some Japanese traders like to keep their stocks at low levels before the end of the financial year in March.
Domestic trading activities have become more active recently, with local spot premiums gradually rising on the week, traders said.
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