The Qatar Investment Authority has become Barclays’ largest investor after less than a fifth of the bank’s existing shareholders participated in its £4.5bn capital-raising issue.

Barclays said on Friday that 19 per cent of existing shareholders had taken up their rights in the ‘claw-back’ issue. The bank had conditionally pre-placed shares with around 20 institutional investors as well the QIA and Challenger, a Qatari fund.