So you think it's a free market Dept.

Currency Spikes at 4 P.M. in London Provide Rigging Clues

By Liam Vaughan & Gavin Finch - Aug 27, 2013 7:01 PM ET

In the space of 20 minutes on the last Friday in June, the value of the U.S. dollar jumped 0.57 percent against its Canadian counterpart, the biggest move in a month. Within an hour, two-thirds of that gain had melted away.
The same pattern -- a sudden surge minutes before 4 p.m. in London on the last trading day of the month, followed by a quick reversal -- occurred 31 percent of the time across 14 currency pairs over two years, according to data compiled by Bloomberg. For the most frequently traded pairs, such as euro-dollar, it happened about half the time, the data show.

The recurring spikes take place at the same time financial benchmarks known as the WM/Reuters (TRI) rates are set based on those trades. Now fund managers and scholars say the patterns look like an attempt by currency dealers to manipulate the rates, distorting the value of trillions of dollars of investments in funds that track global indexes. Bloomberg News reported in June that dealers shared information and used client orders to move the rates to boost trading profit. The U.K. Financial Conduct Authority is reviewing the allegations, a spokesman said.
“We see enormous spikes,” said Michael DuCharme, head of foreign exchange at Seattle-based Russell Investments, which traded $420 billion of foreign currency last year for its own funds and institutional investors. “Then, shortly after 4 p.m., it just reverts back to what seems to have been the market rate. It adds to the suspicion that things aren’t right.”

Global Probes

Authorities around the world are investigating the abuse of financial benchmarks by large banks that play a central role in setting them.
Barclays Plc (BARC), Royal Bank of Scotland Group Plc and UBS AG (UBSN) were fined a combined $2.5 billion for rigging the London interbank offered rate, or Libor, used to price $300 trillion of securities from student loans to mortgages. More than a dozen banks have been subpoenaed by the U.S. Commodity Futures Trading Commission over allegations traders worked with brokers at ICAP Plc (IAP) to manipulate ISDAfix, a benchmark used in interest-rate derivatives. ICAP Chief Executive Officer Michael Spencer said in May that an internal probe found no evidence of wrongdoing.