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Pedestrians pass 30 South Colonnade, centre, where the London interbank offered rate, or Libor, was set daily.
A second Libor submitter, 61-year-old Peter Johnson, had pleaded guilty. The men are expected to be sentenced on Thursday.
Reporting restrictions on the verdicts were lifted on Monday after the jury failed to reach a verdict on two other defendants.
The verdicts come four years after Barclays became the first of 11 powerful banks and brokerages to be slapped with a hefty fine over rate fixing allegations, sparking a political and public backlash that forced out charismatic former CEO Bob Diamond, an overhaul of Libor rules and the criminal inquiry.