Barclays said Thursday that it is reorganising its investment banking operations to try and boost returns at the UK bank's main revenue generator in the face of increasing regulatory pressure.

In an internal memo Rich Ricci, the head of Barclays's investment bank, said the group will create regional heads to help drum up business around the globe. Mr. Ricci also announced a single executive committee for the corporate and investment bank. The group's fixed-income, commodities and currencies division, or FICC, will merge with Barclays's equities business into a single markets division in an effort to increase cost savings, Mr. Ricci wrote.