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Yamaha Motor Co. shares fell after it reported weaker quarterly results pressured by US tariffs and impairment losses at its US plant in its outdoor land vehicle business. Shares dropped as much as 4% in Tokyo, the lowest since September, after third-quarter operating profit tumbled 39%. Its outdoor land vehicle segment — which includes all-terrain and recreational off-highway vehicles — posted an operating loss amid tariffs and impairment charges, according to a Wednesday statementBloomberg Terminal. Higher labor, R&D and other expenses also weighed on earnings.