The price range was narrowed to 4.20 euros to 4.60 euros on Tuesday when order books were covered in the upper half, indicating that the Irish government was set to net at least 3 billion euros from the sale of a 25 percent stake.

The bookrunner said on Wednesday that it expected retail investors would be allocated 10 percent of the deal. Order books for institutional investors will close on Thursday at 1100 GMT with trading in the state-owned bank set to commence on Friday.

(Reporting by Padraic Halpin; Editing by Elaine Hardcastle)