AIB Group plc, operating primarily through its principal subsidiary Allied Irish Banks, p.l.c., is one of the largest commercial banks in the Republic of Ireland. The bank's business model is centered around providing a full spectrum of financial services to personal, SME, and corporate customers. Its core revenue sources are net interest income from its extensive loan portfolio—which includes residential mortgages, commercial lending, and personal loans—and fee and commission income from wealth management, insurance, and capital markets activities. AIB operates through four main segments: Retail Banking, Capital Markets, AIB UK, and a newly established Climate Capital segment focused on financing renewable energy and green infrastructure. Geographically, the vast majority of its operations and revenue are concentrated in Ireland, with a secondary presence in the United Kingdom. The bank holds a dominant competitive position in the Irish market, particularly in mortgage lending where it commands an approximate 36% market share, benefiting from a highly concentrated domestic banking sector following the exit of several foreign competitors.
