Tokyo, February 8

Bank of Japan (BoJ) Governor Haruhiko Kuroda said today he will publish the outcome of investigations the central bank is conducting into a media leak of its impending decision last month to deploy negative interest rates.

The online edition of Japanese daily Nikkei ran a story saying the BoJ was discussing adopting a negative interest rate policy several minutes before the bank’s official announcement of the decision on January 29.

The yen weakened and Tokyo stock prices jumped on the report, which did not identify its source.

The BoJ has taken some heat over the report, which opposition party lawmakers criticised in parliament as giving investors with access to the Nikkei an unfair trading advantage over those who had no access.

‘According to our investigations so far, there was no exchange of information between BoJ staff’ and Nikkei that could have led to report, Kuroda told parliament today.

“We plan to publicise outcome of our investigations,” he added, though he did not say when it will become available.

Kuroda said BoJ was also not aware of any prohibited exchange of information between Nikkei and government representatives present at the review. Nikkei was not immediately available to comment.

Several senior BoJ officials and two government representatives — one from the Finance Ministry and another from the Cabinet Office — attend BoJ rate reviews where its nine board members set monetary policy.

Everyone present at meeting is prohibited by law from leaking information on what was discussed before the official announcement is made.

Finance Minister Taro Aso told the same parliamentary meeting that his ministry was cooperating with BoJ’s investigations, and that no staff from his ministry was so far found to be involved in the leak.