Five of the biggest US equities brokers have signed up to an exchange-led initiative aimed at improving the transparency of their dark pools, as they seek to alleviate regulatory concerns over the impact of alternative trading systems.

The brokers - Barclays Capital, Getco, Goldman Sachs, Knight Capital Group and UBS - will start publishing trading data from their dark pools on NYSE Euronext's website next month, according to a statement. Other brokers also plan to join the scheme in the coming weeks, the exchange said.