The Lloyds Banking Group, which owns Lloyds TSB, Cheltenham & Gloucester PLC and Bank of Scotland PLC among others, received a total of 22,420 complaints between 1 January and 30 June this year – more than a quarter of all complaints taken.
The second most complained-about banking group is Barclays with 9,215 complaints, followed by Royal Bank of Scotland (RBS) with 6,469, Santander with 5,372, and HSBC with 4,031.
The ombudsman recorded a total of 84,212 complaints logged in the period, a small increase on the 82,136 cases recorded in the second half of 2009.
This year, the financial service upheld 44% of the complaints made, compared with 53% in the second half of 2009.
Lloyds, in a statement responding to the data findings, said: "Our relationship with our customers is at the heart of our business and we take all feedback very seriously.
"With more than 30 million customers, the group has the largest customer base in the UK. The vast majority of our customers are happy with the service we provide and this is reflected in the low number of complaints we receive relative to the high number of accounts our customers hold."
Natalie Ceeney, chief executive and chief ombudsman, said: "The latest set of complaints data shows that some businesses are really committed to ensuring that complaints are handled well, and are used to inform and improve the service they offer their customers.
"However, the complaints data also shows that there is still more that some businesses need to do to ensure that complaints are properly investigated and fairly resolved.
"The ombudsman is keen to play its part and help businesses draw lessons from the complaints that we see, so disputes can be sorted out at the earliest opportunity."
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