Barclays, Citigroup, Credit Suisse, Deutsche Bank, JP Morgan, Royal Bank of Scotland (RBS), Societe Generale and UBS were hit with fines totalling 99.1 million Swiss francs (USD 96.3 million, 92.7 million euros), the Swiss Competition Commission (COMCO) said.
COMCO, which first started investigating the banks in February 2012 for the suspected manipulation of a range of rates, said in a statement it had pursued them through five separate procedures, which today have been partially or totally concluded."
COMCO said it had determined that "between September 2005 and May 2008, several banks participated, for different durations, in a cartel in interest rate derivatives in euro."
Four of the banks, Barclays, Deutsche Bank, RBS and Societe Generale, had reached an amicable settlement approved by COMCO on December 5, it said.
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Barclays meanwhile took the biggest hit, or nearly 30 million Swiss francs, followed by RBS with 12.3 million and Societe General with 3.25 million, the regulator said, adding that proceedings in the case were continuing against BNP Paribas, Credit Agricole, HSBC, JP Morgan and Rabobank.
The second largest portion of the fine was linked to a cartel aimed at rigging LIBOR rates -- the global commercial benchmark used to peg millions of rate-sensitive contracts and loans around the world -- denominated in Swiss francs.
Under a deal approved by the regulator on December 14, RBS was granted full immunity for having spilled the beans about the cartel to COMCO, while its partner in crime JP Morgan was hit with a 33.9-million-franc fine.
A separate investigation meanwhile found that a number of banks had committed "infringements of competition law" related to interest rate derivatives in yen, lasting between one and 10 months, in the period from 2007 to 2010.
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