Barclays' investment bank experienced a "challenging", "disappointing" and "weaker" third quarter, with traditional investment banking, equities and credit all posting double-digit revenues declines.

The UK bank Thursday reported third quarter revenues for the investment bank of £1.66 billion, down from £1.85 billion in the same period a year ago. That 10% decline compares with an average 10% year-on-year increase in revenues at the UK bank's global investment banking peers, according to analysts at Credit Suisse.