SONIA (interest rate)
The Sterling Overnight Index Average, abbreviated as SONIA, is the principal risk-free interest rate benchmark for sterling markets, administered by the Bank of England and published each London business day at 09:00 UK time for the previous day’s transactions. Introduced in March 1997 (1997-03) and transferred to Bank of England administration in April 2016 (2016-04), SONIA was reformed with a transactions-based methodology effective 23 April 2018.