(Reuters) - Retail foreign exchange brokers from New Zealand to New York were nursing hefty losses from the Swiss National Bank's shock move to abandon a cap on its currency, with some even being forced out of business.

Retail broker Alpari UK filed for insolvency on Friday after customers sustained losses following the SNB's decision.

"The recent move on the Swiss franc caused by the SNB's unexpected policy reversal of capping the Swiss franc against the euro has resulted in exceptional volatility and extreme lack of liquidity," Alpari, the shirt sponsor of English Premier League club West Ham, said in a statement.

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