The Financial Conduct Authority (FCA) received 2.11m new complaints between July and December 2015, down 1.4% from the first half of the year.
According to the FCA, this was a result of a 10% drop in complaints about current accounts, and a 15% drop in complaints about savings accounts in the period.
The FCA said over half of all complaints were related to PPI, and when that number was excluded, the number of complaints in the second half of 2015 fell to 1.17m. Total PPI complaints rose by 6% between H1 and H2 of 2015.
Christopher Woolard, director of strategy and competition at the FCA, said:
"It is positive to see that the longer term reduction in the volume of complaints has continued into the latest period. Firms seem to have taken on board our previous feedback on levels of complaints and we are slowly seeing firms address these issues.
"However, firms still need to do all they can to reduce complaints and ensure that they are working in the best interests of consumers."
At the moment the FCA only releases the number of complaints for firms which receive over 500 complaints in a half year period. However it said that in the future it will be providing more information, such as the number of complaints by number of customers or number of accounts. It will also require firms to do this on their own website from February 2017.
The most complained about companies were:
1. Barclays Bank Plc – 279,561 (a decrease of 1% since 2015 H1)
2. Lloyds Bank Plc – 230,041 (a decrease of 1% since 2015 H1)
3. Bank of Scotland Plc – 182,702 (a decrease of 4% since 2015 H1)
4. National Westminster Bank Plc – 135,262 (a decrease of 7% since 2015 H1)
5. HSBC Bank Plc – 120,986 (a decrease of 14% since 2015 H1)