BARCLAYS DARL POOL CONCERNS SAID RAISED BEFORE

Trading firms and employees raised concerns about high-speed traders at Barclays’ dark pool months before the New York attorney general alleged in June that the firm lied to clients about the extent of predatory trading activity on the electronic trading venue, according to people familiar with the firms

MarketWatch reports that some big trading outfits noticed their orders weren’t getting the best treatment on the dark pool, said people familiar with the trading. The firms began to grow concerned that the poor results resulted from high-frequency trading, the people said.

In response, at least two firms — RBC Capital Markets and T. Rowe Price Group — boosted the minimum number of shares they would trade on the dark pool, letting them dodge high-speed traders, who often trade in small chunks of 100 or 200 shares, the people said.

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Barclays dark pool drew early alarms