By Margot Patrick

LONDON--The U.K. financial regulator Wednesday said it is gathering information on potential manipulation of benchmark foreign-exchange rates, amid new allegations that traders at banks are rigging rates to maximize profits.

Bloomberg News earlier Wednesday reported that employees at unidentified banks have been front-running client orders and rigging WM/Reuters rates by pushing through trades before and during the 60-second windows when the benchmarks are set, citing dealers with knowledge of the practice. Dealers colluded with counterparts to boost chances of moving the rates, according to two of the unnamed people cited in the story.

The data behind the rates are collected and distributed by World Markets Co., part of State Street Corp. (STT). Thomson Reuters Corp. (TRI) contributes data and has a co-branding agreement on the products.

"The FCA is aware of these allegations and has been speaking to the relevant parties," a spokesman for the regulator said. He said he couldn't comment further.

The fresh allegations of market manipulation come nearly a year after Barclays PLC (BCS) acknowledged that some of its employees had tried to manipulate benchmark interest rates including the London interbank offered rate, or Libor. UBS AG (UBS) and Royal Bank of Scotland Group PLC (RBS) have since admitted that some of their staff also tried to rig interest rates and the three banks were collectively fined around $2.5 billion.

Fund managers and index providers use the WM/Reuters foreign-exchange rates to value their holdings and assess performance. The rates are based on actual trades or quotes, but, according to the Bloomberg story, can be manipulated by traders concentrating orders in the moments before and during a 60-second window before scheduled rate-setting times.

For example, "one trader with more than a decade of experience said that if he received an order at 3:30 p.m. to sell 1 billion euros ($1.3 billion) in exchange for Swiss francs at the 4 p.m. fix, he would have two objectives: to sell his own euros at the highest price and also to move the rate lower so that at 4 p.m. he could buy the currency from his client at a lower price," Bloomberg reported. The trader would profit from the difference between the reference rate and the higher price at which he sold his own euros, the trader told Bloomberg.

"In our role as administrator of the WM/Reuters FX rates, we publish spot fixings for the major currency pairs that are derived from actual executed trade data [or, in certain circumstances, order rates] received from multiple execution venues through a streaming rather than solicitation process. The process for capturing this information and calculating the spot fixings is automated and anonymous and the rates are monitored for quality and accuracy," a spokeswoman for State Street said.

A spokesman for Reuters referred questions on the matter to State Street.

-Write to Margot Patrick at margot.patrick@dowjones.com

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