On 19 February 2021, NatWest Group announced a phased withdrawal of all banking activity and associated services within the Republic of Ireland.

Within a year, it opened branches at Antrim, Armagh, Ballymoney, Comber, Downpatrick, Enniskillen, Lurgan, Portadown and Tandragee.

[14][15] In 1860, Ulster bank opened a new head office on Waring Street, Belfast, together with branches in Sligo and in Ardee, Co. Louth.

[14][15] In the early 1900s, Ulster Bank opened branches in Wexford, Dún Laoghaire, Cork, Waterford and Limerick.

On 16 May 1968, Ulster Bank announced that the administration of its lending activities in the Republic of Ireland would be moved from Belfast to Dublin.

[16] In 1980, Ulster Bank introduced the "Henri Hippo" money box and savings plan for schoolchildren.

Lord Chief Justice Sir Brian Kerr criticised the bank's security measures during the trial.

[28] In 2009, the First Active branch network and business of several hundred thousand savers and borrowers was merged with Ulster Bank, and the brand name was retired in 2010.

Initial estimates that the problem would be sorted out within a week were wildly optimistic, with thousands of customers still unable to access their accounts into late July 2012, with ongoing issues still not resolved by mid-August 2012.

This RBS / NatWest / Ulster Bank issue has proved to be one of the largest IT failures the world has ever known.

Ulster Bank (the smallest part of the RBS group) was to initially set aside £28 million for compensation to customers.

[35] In September 2020, The Irish Times reported that NatWest was considering closing all Ulster Bank operations in the Republic of Ireland, a process that would take around six years.

[36] It had previously been reported in March 2014 that the then RBS Group was considering merging the bank in the Republic of Ireland with some of its rivals in order to reduce its holding, with RBS Group's annual results for 2013 having revealed that Ulster Bank had operating losses of £1.5 billion and accounted for a fifth of the parent group's total bad debt charges, although in October 2014, RBS had confirmed it would retain Ulster Bank following improved market conditions in Ireland.

National Westminster Bank is a member of the Financial Services Compensation Scheme and UK Finance.

The bank provides a Debit Mastercard to customers with their current accounts, in addition to other financial services.

In 2019, Ulster Bank issued a new series of banknotes printed in polymer, which replaced its paper equivalents that were previously in circulation.

On 8 February 2008, Ulster Bank Group Chief Executive, Cormac McCarthy, announced a three-year sponsorship deal worth over £1 million for the Belfast Festival at Queen's.

[70][71] Ulster Bank announced official sponsorship of the GAA All-Ireland Senior Football Championship in April 2008.