Barclays has reported pre-tax profits of 3.95 billion pounds for the first half of 2010 - up 44% on the same period last year.
Most of the profits came from the bank's investment banking arm, Barclays Capital, which made 3.4 billion pounds.
Barclays says it lent 18 billion to UK households and businesses over the six month period.
Earlier this week, HSBC reported first-half profits of 7 billion pounds, while Lloyds made 1.6 billion pounds.
Royal Bank of Scotland will announce its results on Friday.