Allied Irish Banks p.l.c. (AIB) is a major commercial bank

Commercial bank

After the implementation of the Glass–Steagall Act, the U.S. Congress required that banks engage only in banking activities, whereas investment banks were limited to capital market activities. As the two no longer have to be under separate ownership under U.S...

 based in Ireland.

AIB is one of the so called "big four

Big Four (banks)

Big Four is the colloquial name for the four main banks in several countries, where the banking industry is dominated by just four institutions and where the phrase has gained currency.-Australia:...

" commercial banks in the state. The bank has one of the largest branch networks in Ireland; only Bank of Ireland

Bank of Ireland

The Bank of Ireland is a commercial bank operation in Ireland, which is one of the 'Big Four' in both parts of the island.Historically the premier banking organisation in Ireland, the Bank occupies a unique position in Irish banking history...

 fully rivals it. AIB offers a full range of personal and corporate banking services. AIB Capital Markets is the division of the company that offers international banking and treasury operations.