Japanese monetary authorities did not conduct any currency intervention between Jan. 28 and last Thursday, according to the Finance Ministry.

The results were released after some market participants speculated that the ministry and the Bank of Japan may have stepped into the foreign exchange market earlier this month to stem the yen's sharp gain against the dollar.

The dollar briefly plunged to a roughly 15-month low below the ¥111 line in London on Feb. 11 as concerns about the global economic outlook prompted investors to buy the yen, which is seen as a safe-haven currency.

The ministry and the BOJ have not intervened in the foreign exchange market since November 2011, when they sold the yen for the dollar, according to officials.