Information on the number and value of mortgages owned by banks and non-banks can be found in the Central Bank of Ireland quarterly statistics on mortgage arrears and repossessions on Principal Dwelling Houses (PDHs) and Buy to Lets (BTLs). At present, the information on non-banks is broken down by retail credit firms and unregulated loan owners.
The latest statistics, in respect of Q3 2018, were published on 18 December 2018 and can be found at: https://www.centralbank.ie/statistics/data-and-analysis/credit-and-banking-statistics/mortgage-arrears.
I have been advised by the Central Bank that it is aware of forthcoming transactions through supervisory engagement with the banks and retail credit firms and the Central Bank ensures that these transactions are reflected in the latest mortgage arrears statistics as they are published.