Nationwide Building Society Size 2025. Nationwide is the world's largest building society, with over 17 million customers, 16 million of whom have a current account, mortgage or savings product, and are therefore members of the. Discover nationwide building society's balance sheet and financial health metrics.

Discover details on nationwide building society’s annual and quarterly financial performance covering key metrics like revenue, net income, growth ratios, equity ratios, profitability ratios,. Nationwide building society customers could be awarded a free £100 cash boost in 2025 as part of its fairer share payment.