Its pre-tax profits are up 30 per cent to £244.9 million, total assets are up 6.3% to £107.8 billion, while its total capital is up 2.7% to £6.4 billion.
Net mortgage advances were £7.4 billion. Gross lending was 11.1%, up at £13.7 billion, while during the half year Nationwide secured a 13.7% share of the net mortgage market and a 10.8% share of the remortgage market.
UCB Home Loans, the Society's specialist mortgage lender, recorded a strong performance with gross mortgage advances of £1.0 billion (October 2003: £1.0 billion). UCBHL's asset base exceeded £5 billion for the first time.
Philip Williamson, chief executive of Nationwide, said: "Our performance in the first half of the year has once again been first-class. We have made record profits whilst also delivering the highest ever level of pricing benefits to our members. In our core markets of mortgages, retail savings and banking services we continue to punch well above our weight.
"Great value financial services delivered with fairness, honesty and transparency have attracted strong new business volumes whilst encouraging high levels of customer retention. Consequently, we have seen mortgage growth of £7.4 billion, a market share of 13.7% - well above the Society's par share of 8.6%."