The bank also said: "The shareholders meeting
had already taken place and there was therefore no need to issue press
releases or additional formal communications to shareholders/other
Professor Alistair Milne, an expert on financial regulation in the City, said banks are expected to release accurate information about major deals.
"Any discrepancy of that kind is serious because it raises questions in the minds of investors. Every bank is well aware the annual report is a critical document and a huge amount of time and attention is put in to trying to get all the details correct."
The Abu Dhabi government investment vehicle that provided the funding, International Petroleum Investment Company (IPIC), was not mentioned in any Barclays' announcements until six months after the deal.