Susquehanna International Securities, one of a clutch of secretive high-frequency trading firms, has reported a surge in revenues of almost 50% at its UK branch during 2010, beating the average performance of its peers over the period.

The firm generated revenues, which it describes as net trading gains, of $56.5m during 2010, according to accounts filed with Companies House last year. The figure was 49% higher than that reported in the previous period.