The data came in the wake of Bank of Japan Governor Kazuo Ueda's warning on Wednesday that continued rises in food costs could affect the public's inflation expectations, underscoring the central bank's focus on upside price risks.
The rise in the corporate goods price index (CGPI), which measures the price companies charge each other for their goods and services, exceeded a median market forecast for a 4.0% increase and followed a revised 3.9% increase in December.
Goods ranging from food, textile, plastic and non-ferrous metal saw prices rise, the data showed.
An index of yen-based import prices rose 1.5% in January from a year earlier after a revised 0.7% drop in December, the data showed, a sign the yen's weakness continued to inflate costs for companies.
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