Swiss National Bank chairman Philipp Hildebrand resigns
9 January 2012 Last updated at 17:09 GMT
The chairman of the Swiss National Bank (SNB), Philipp Hildebrand, has resigned with immediate effect.
It follows revelations his wife Kashya bought $504,000 (£323,024) in August, three weeks before the central bank intervened to cap the Swiss franc.
He told a news conference he had "no knowledge" of his wife's transaction, which she later made a profit on.