Stocks jump following BoJ move

Markets jumped on Friday, boosted by the Bank of Japan's decision to implement negative interest rates.

The S&P 500 surged 2.5 percent, the STOXX Europe 600 climbed 2.2 percent, the Nikkei 225 jumped 2.8 percent and the Shanghai Composite Index surged 3.1 percent.

Despite the strong finish to the month, the S&P 500 ended January down 5.1 percent, its worst month since August.