Network Sesame has topped the Financial Ombudsman Service (FOS) complaints table for IFA businesses, with 138 complaints in the first half of this year, compared to 140 in H2 2011.
Complaints against other IFA firms have also continued to fall.
Openwork recorded 100 complaints, compared to 116 in the previous six-month period. St James's Place fell from 50 to 47, Personal Touch from 47 to 44 and Positive Solutions from 60 to 40.
AWD Chase de Vere, that recorded 38 cases in the second half of last year, did not reach the minimum of 30 cases required to make the tables.
Figures from the FOS's annual review in May showed complaints about IFAs fell to 1% in 2011/12, from 1.5% the previous year.
However, the figures were dwarfed by the most complained about business, Barclays, that recorded 23,703 new complaints, mainly as a result of PPI mis-selling.
Chief ombudsman Natalie Ceeney said the FOS was still being bombarded with payment protection insurance (PPI) complaints, which more than doubled in the first half of 2012 to 1,500 new cases per day.
"We've also seen an increasing shift towards consumers doing it themselves rather than using a claims manager - with up to half of all new complaints now coming directly from consumers without paid-for representation, compared to less than 20% a year ago," she said.
"This means our consumer front-line is busier than ever - taking over 3,000 calls on PPI a day and bringing much needed clarity to confused and bewildered consumers."
Aviva was the most complained-about life company, on 456 cases, followed by Phoenix Life (378), Prudential (323) and Legal & General (319).
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