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Landsbankinn (literally "the National bank"), originally NBI hf, is an Icelandic bank headquartered in Reykjavík. It was established in 2008 by the Icelandic government out of the domestic operations of its predecessor Landsbanki which failed during the 2008–2011 Icelandic financial crisis. It is the largest bank in Iceland and the history of its predecessor goes back to 1885. In December 2017, the bank had just over 123,000 private customers and just over 13,500 corporate customers. The bank has 37 branches around Iceland. In 2018, Landsbankinn had a 37,8% market share in the retail market and 34% in the corporate banking market.

The Central Bank of Iceland (Icelandic: Seðlabanki Íslands) is the central bank or reserve bank of Iceland. It has served in this capacity since 1961, when it was created by an act of the Alþingi out of the central banking department of Landsbanki Íslands, which had the sole right of note issuance since 1927 and had conducted only limited monetary policy. Seðlabanki Íslands is owned by the Icelandic government, and is administered by a governor and a seven-member supervisory board, elected by the country's parliament following each general election.

Íslandsbanki is an Icelandic bank with roots tracing back to 1884, formerly being the domestic part of Glitnir banki hf., but on 15 October 2008 being split from the bankrupt Glitnir and reestablished into a new independent bank. The sole operations of the bank is to manage a branch network in Iceland, with a 20%-40% market share across all domestic franchise areas. As of 2017, the bank has 14 branches around Iceland. The bank is fully owned by the Icelandic State Treasury.

Glitnir is an Icelandic bank. It was created by the state-directed merger of the country's three privately held banks - Alþýðubanki, Verzlunarbanki and Iðnaðarbanki - and one failing publicly held bank - Útvegsbanki - to form Íslandsbanki in 1990. Established in 1904, the bank was first known as Íslandsbanki. The name Glitnir was chosen in 2006 to reflect their wider Nordic tradition and to distinguish a new era of growth and expansion.

ALMC hf., formerly Straumur Investment Bank hf. (Icelandic: Straumur Fjárfestingabanki), is a regional investment bank headquartered in Reykjavík, Iceland. Founded in 1986 as Hlutabréfasjóðurinn and rebranded as Straumur in 2004, the bank initially survived the financial turmoil in late 2008 but was nationalised by The Financial Supervisory Authority of Iceland (FME) on 9 March 2009. [3] Straumur was the last of Iceland's four biggest banks to remain independent, during the financial crisis.[3] In the summer of 2010, the bank had been rebranded as ALMC and owned by its creditors. The majority of ALMC’s owners are international investors and financial institutions and independent from any state involvement.

MP Banki hf. provides commercial and investment banking products and services in Iceland. It offers commercial banking products and services, including current accounts, debit cards, credit cards, saving accounts, loans, payment service, and online banking services for businesses and individuals. The company also offers investment banking services, including asset management services to individuals, institutional investors, and legal persons; private banking services; and capital market services, such as professional advice on securities trading, derivatives trading for professional investors, favorable purchase and sales commissions, custody of securities, and access to international markets.

Arion Banki hf. formerly Nýja Kaupþing hf or New Kaupthing is an Icelandic bank with roots tracing back to 1930. The bank operates in the Greater Reykjavík area as well as in the largest urban areas around the country. In 2016 the bank had the third largest market share of the current accounts in Iceland (30%), behind Landsbankinn (36.1%) and Íslandsbanki (31%).[2] The Bank has 21 branches all over the country and over 100,000 customers.

Sparisjóður Reykjavíkur og nágrennis (English: Reykjavík Savings Bank), often shortened to SPRON was an Icelandic savings bank. It had six branches, all in the Reykjavík capital area. The bank was established March 5, 1932, and was nationalized in 2009 following a major banking and financial crisis in Iceland. Most assets were subsequently moved to Nýja Kaupþing.

Kaupthing Bank (Icelandic: Kaupþing banki; Icelandic pronunciation: ​[ˈkʰœiːpˌθiŋk]) was a major international Icelandic bank, headquartered in Reykjavík, Iceland. It was taken over by the Icelandic government during the 2008–2011 Icelandic financial crisis and the domestic Icelandic based operations were spun into a new bank New Kaupthing, which was subsequently renamed Arion Banki. All the non-Icelandic assets and debts remained with the now defunct Kaupthing Bank. Prior to its collapse it also allegedly loaned money to various parties with the purpose of buying Kaupthing shares.