The success of the fundraising comes despite a downbeat trading update and a number of legal disclosures in the prospectus for the issue.
Barclays priced the shares in late July at 185 pence each, well below yesterday's close of 270.55 pence.
The new shares were due to start trading in London today.
Barclays is -1% at 270.25 pence in London. (PR)