The Swiss National Bank's foreign exchange reserves fell in December, data showed on Monday.

The SNB held 784.006 billion Swiss francs ($848.12 billion)in foreign currency at the end of December, compared with 791.193 billion francs at the end of November, revised from an originally reported 789.958 billion, preliminary data calculated according to the standards of the International Monetary Fund showed. ($1 = 0.9244 Swiss francs) (Reporting by Anna Mackenzie)