This Euro OverNight Index Average (EONIA) is sponsored by the European Money Markets Institute (EMMI).
For the period ending September 2019 it was calculated by the European Central Bank at 7.00 pm (CET) as a weighted average of all overnight unsecured lending transactions in the interbank market, and carried out before the closing of real-time gross settlement (RTGS) systems at 6.00 pm (CET).
It was reported on an act/360 day count convention and displayed to three decimal places.
EONIA is widely used as a reference rate for derivatives transactions within the euro-zone.
In order to maintain EONIA for a transitional period and until its discontinuation in 2022, its methodology has been changed.
With effect from 2 October 2019, EONIA is defined as €STR plus a spread of 0.085%.
Distinguish from EURONIA which is sponsored and published by WMBA Ltd in London.