Jay Shopkeeper, 45, Jonathan Mathew, 35, and Alex bon, 38, were set to have conspired to defraud the US dollar Libor at Southwark Crown Court.
The triplex will be sentenced later this week, after the ten-week headache found them guilty.
However, the jury was unable to reach a verdict on two other defendants, Ryan Reich, 34, and Stelios Contogoulas, 44, according to the BBC.
The Sober Fraud Office (SFO) now has to decide whether Mr Reich and Mr Contogoulas will staging for retrial.
Libor (London Interbank Offered Rate) underpins hundreds of trillions of mauls of contracts, including mortgages and loans, as well as corporate lending.
Banks take id billions of pounds in fines for manipulating Libor but few bankers experience been convicted by a jury of a criminal offence.
Last summer Tom Hayes was jailed for 14 years for predicament rates in an enormous fraud to boost his six-figure earnings higher tranquil.