After a nine-week trial at London's Southwark Crown Court, Tom Hayes was convicted of eight counts of conspiracy to defraud between 2006 and 2010, when he worked for Swiss bank UBS and its US rival Citigroup as yen derivatives trader.
The British national is the first person to be convicted by a British jury of rigging the benchmark Libor inter-bank lending rate.
The SFO said that Hayes bribed traders across 10 lenders into fixing the Libor rate so he could make a profit in a bid to boost his own salary and bonus of up to seven figures.
Libor rate is an interest rate used by banks around the world to set the price of financial products worth trillions of pounds.
Even minor movements in the rate can result in bumper profits for a trader manipulating the rates.