Here's the relevant bit from the CFTC's order and settlement with Barclays:
During the period from at least mid-2005 through mid-2008, certain Barclays Euro swaps traders, led by the same former Barclays' senior Euro swaps trader, coordinated with traders at certain other panel banks to have their respective Euribor submitters make certain Euribor submissions in order to affect the official EBF Euribor fixing. These requests to and among the traders were made to benefit the traders' respective derivatives trading positions and either maximize their profits or minimize their losses.
The former Barclays senior Euro swaps trader, while still employed by Barclays, spoke daily with traders at certain panel banks concerning their respective derivatives positions in order to determine how to change the official EBF Euribor fixing in a manner that benefitted their derivatives positions. In these conversations, the traders agreed to contact their respective Euribor submitters to request the agreed-upon Euribor submission. The Barclays senior Euro swaps trader also received at times requests for certain Euribor submissions from traders at the other banks, which he then made of the Barclays Euribor submitters as if the requests were his own, at times blind carbon copying the external trader on his emails to Barclays' Euribor submitters. By such conduct, the Barclays Euro Traders were attempting to manipulate Euribor and aiding and abetting the attempts to manipulate Euribor by other banks.
The CFTC order goes on to describe at least six incidents in which Barclays traders conspired with traders at other banks to manipulate Libor, including one four-month long period of coordinated manipulation to generate trading profits. The CFTC doesn't name the banks, but obviously knows exactly who was involved in these actions with the Barclays traders. We know that at least three banks are involved, since the order lists them as Bank A, Bank B and Bank C.
In addition to Barclays, there are several foreign banks and three United States banks involved in Libor panels: JPMorgan Chase, Bank of America and Citigroup. There's no way to tell which were involved in the Libor scandal with Barclays. For now.
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