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Sterling Overnight Index Average. Tracks actual average market sterling funding rates each day for settlement that day where repayment is made on the following business day.

It is published by the Wholesale Market Brokers' Association (WMBA) in London at 5pm each day.

It is defined and calculated as the weighted average rate (to four decimal places) of all unsecured sterling overnight cash transactions brokered in London by WMBA member firms between midnight and 4.15pm London time with all counterparties in a minimum deal size of £25 million.

See also