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EBS' d.a.c. is a financial institution in Ireland registered as a designated activity company and was the country's largest building society until 1 July 2011. At its peak, the EBS had more than 300,000 customers and distributed its products through a branch and franchised agency network. It handles direct business by telephone and the Internet. The former head of EBS building society Fergus Murphy told the Oireachtas Banking Inquiry in 2015 there was a “very reasonable chance” the institution could have made it through the crash without being nationalised and merged with AIB if it had not got involved in land development and commercial property lending.

DEPFA Bank plc was until 2014 a Dublin-based German-Irish bank. It provided financial services to the public sector and also provided financing for larger infrastructure projects. The name derivates from DeutscheAt the end of the 1990s, the bank went through a legal restructuring, which led the bank to move its headquarters to the IFSC in Dublin, Ireland in 2002 with the Irish government specifically legislating for it. Depfa Bank was purchased by German mortgage giant Hypo Real Estate in October 2007.The bank ran into liquidity problems in 2008 as a result of the economic and financial turmoil in the United States. At the same time banking supervision in Ireland was very weak, soon to be proved by the 2008–2010 Irish banking crisis.

Allied Irish Banks, p.l.c. is one of the so-called Big Four commercial banks in Ireland. AIB offers a full range of personal, business and corporate banking services. The bank also offers a range of general insurance products such as home, travel and car. It offers life assurance and pensions through its tied agency with Irish Life Assurance plc.In December 2010 the Irish government took a majority stake in the bank, which eventually grew to 99.8%. AIB's shares are currently traded on the Irish Stock Exchange and the London Stock Exchange, but its shares were delisted from these exchanges between 2011 and 2017, following its effective nationalisation.

In May 2000, Nova Corporation and the Bank of Ireland announced the formation a joint venture in Dublin, Ireland, to be called EuroConex Technologies which would process card payment throughout Ireland and eventually the rest of Europe. In May 2001, U.S. Bancorp announced the acquisition of NOVA Corporation for $2.1 billion in stock and cash. In 2004, NOVA announced that EuroConex was to buy Polish processor "CardPoint" from "Bank Zachodni WBK", owned by Allied Irish Banks, This move allowed Bank Zachodni WBK to "sponsor" Euroconex's operations in Poland.

The Bank of Nova Scotia (French: La Banque de Nouvelle-Écosse), operating as Scotiabank (French: Banque Scotia), is a Canadian multinational banking and financial services company headquartered in Toronto, Ontario. One of Canada's Big Five banks, it is the third largest Canadian bank by deposits and market capitalization. It serves more than 25 million customers around the world and offers a range of products and services including personal and commercial banking, wealth management, corporate and investment banking. With more than 92,001 employees and assets of CA$1,136 billion (according to 2020 annual report), Scotiabank trades on the Toronto (TSX: BNS) and New York (NYSE: BNS) exchanges.

Anglo Irish Bank was an Irish bank headquartered in Dublin from 1964 to 2011.It began to wind down after nationalisation in 2009. In July 2011 Anglo Irish merged with the Irish Nationwide Building Society, forming a new company named the Irish Bank Resolution Corporation. Michael Noonan, the Minister for Finance stated that the name change was important in order to remove "the negative international references associated with the appalling failings of both institutions and their previous managements".

Ulster Bank (Irish: Banc Uladh) is a large retail bank, and one of the traditional Big Four Irish clearing banks. The Ulster Bank Group is subdivided into two separate legal entities: National Westminster Bank, trading as Ulster Bank (registered in England and Wales and operating in Northern Ireland); and Ulster Bank Ireland dac (UBIDAC – registered in the Republic of Ireland). The headquarters of Ulster Bank Ireland are located on George's Quay, Dublin, in the Republic of Ireland, whilst the headquarters of Ulster Bank Northern Ireland are in Donegall Square East, Belfast, in Northern Ireland, and it maintains a large sector of the financial services in both the UK and the Republic of Ireland.

Permanent TSB Group Holdings plc, formerly Irish Life and Permanent plc is a provider of personal financial services in Ireland.It was a mutual organisation, jointly owned by those saving and borrowing. It demutualised to form a plc on 21 September 1994. Irish Permanent was a predominantly personal banking and mortgage company and in 2001 acquired the Irish Trustee Savings Bank from the Government of Ireland.During the Irish banking crisis the group was split. The profitable Irish Life Group was purchased by the government for €1.3 billion, and subsequently sold to Great-west Lifeco in July 2013.

KBC Bank Ireland plc is a bank in Ireland with offices in Dublin, Cork, Limerick, Galway, Waterford and Belfast. It was established in 1972 as Irish Intercontinental Bank. In 1978 KBC Bank, which is headquartered in Brussels, acquired a 75% interest. KBC Bank acquired a full 100% shareholding in IIB in 1999, and in 2000 the bank's name changed to IIB Bank. On 27 October 2008, the 30th anniversary of KBC's majority ownership, the bank was renamed KBC Bank Ireland plc KBC Bank Ireland provides a wide range of banking services including Corporate, Commercial and Business Banking, Private Banking and Treasury & Capital Markets. Its mortgage division, KBC Homeloans, is a leading mortgage provider in Ireland