Traders on Hottest Streak in Decade Amid Divergence: Currencies

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Currency traders are starting 2015 on their hottest winning streak in a decade.

An index of foreign-exchange returns rose for the past six months, the longest stretch since 2005 and turning last year into the best since 2008. That marks a comeback for traders who, as recently as September, were facing a fourth year of losses as record-low volatility limited opportunities to make money.