The bank has stayed in pole position from its 2005 ranking to lead the November 2010 table of stockbrokers and advisers, as well as stockbroking rankings for FTSE100, FTSE250 and small cap clients produced by data provider Hemscott.
It also retained client numbers, holding a total of 251 companies in November 2010 – considerably above its nearest competitor, Numis Securities, which now has 124.
The tables, in the five-year anniversary edition of the Hemscott Corporate Adviser Rankings Guide, show several new houses in the top five leading positions.
Numis, Cenkos and Investec Securities all added more than 20 clients between November 2005 and November 2010, to jump at least ten places apiece in the rankings.
Cenkos registered the biggest leap, growing from 11 clients in 2005 to 102 this year, to go from an unranked position to number three.
In contrast, Seymour Pierce and UBS saw large client outflows and tied at fifth place with RBS Hoare Govett, with 82 clients each.
In the adviser rankings, four of the top five firms saw client numbers rise substantially. Cenkos moved most from an unranked position to tied third place by growing its client base from seven to 71 in the period, while Arbuthnot Securities also added 40 clients. Morgan Stanley showed significant gains in advising FTSE100 clients, rising from 12th place in 2005 to tie in second place with Bank of America Merrill Lynch this year.