AIB said it had completed a €91 million share buyback announced earlier this month that included a directed repurchase of stock from the State.
The bank said it had purchased more than 2.2 million shares, with a highest price paid at €2.4780 and a lowest at €2.4340.
Almost 700,000 of the shares were purchased through Goodbody Stockbrokers as an on-market buyback, with the remainder through a directed repurchase.
AIB has now repurchased almost 41 million shares since the programme began, at a volume weighted average price of €2.2221 per share.
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The State owns almost 70 per cent of the lender as a result of the financial crisis.