It has been a dramatic and troubling ten days for Davy. Fined by the Central Bank, condemned by politicians, sacked by the NTMA, the stockbroker has seen its reputation significantly tarnished and its financial value slashed. Its chief executive and deputy chair, two of the most influential figures in Irish business, have resigned and the broker is now scrambling to find a finance house willing to buy it. But behind the controversy is a transaction. And it is this transaction, one that triggered a six-year investigation by the Central Bank, that has devastated the stockbroker. We know the basics of…