...Our ratings on Arion Bank balance the bank's established franchise, high capitalization, and robust profitability against its concentration in Iceland's small economy. Alongside the two other domestic systemically important banks (D-SIBs), Arion holds a strong market position in Iceland, with a market share in customer loans of 29%. The bank's presence across several business lines, including insurance and asset management, makes its earnings profile somewhat more diversified than that of domestic peers. With 95% of loans in the domestic market, S&P Global Ratings considers Arion's prominent market position, strong profitability, and robust capital a necessary offset to the bank's inherent concentration risks....