Japanese government data show that the nation conducted its biggest-ever dollar-selling intervention to support the yen in October.

The intervention by the government and the Bank of Japan totaled more than 6.34 trillion yen, or nearly 43 billion dollars at the current exchange rate, from September 29 through October 27.

The previous record was roughly 2.83 trillion yen, marked in September.

Japan conducted an unannounced intervention during the business hours of the New York foreign exchange market on October 21 to counter the yen's sharp depreciation against the dollar. The Japanese currency surged more than 7 yen against the greenback in response.

The yen also rose sharply on Monday last week. Many market players suspect another intervention by Japan.