Sonamara Jeffreys and Darryl Adachi, both highly regarded headhunters in the industry, have joined Heidrick as partners. Daniel Edwards is also leaving Armstrong International to join as a principal with Heidrick.
The departures could be a blow to Armstrong International, one of a handful of top boutique search firms in the financial services industry. The firm's founder, Martin Armstrong, could not be reached for comment.
Last year Armstrong International lost Lucian Hudson, the senior member of staff responsible for the development of internet business, to the government.
Adachi was most recently head of Armstrong International's New York office, and before that focused on the UK funds market, a practice he developed into a major business before he moved to New York. Jeffreys specialises in the investment banking sector and both headhunters were top billers at senior levels in financial services search.
Rupert Channing, managing partner of Heidrick's London office, intends to hire two more partners for the launch of the City branch at a site near St Paul's Cathedral next month, taking the head count to 11 partners and more associates.
Channing and a colleague, Elizabeth Hammond, recently moved a 27-member team from what was then investment bank Donaldson, Lufkin & Jenrette (DLJ) to Bank of America, for a reputed 6m.
Since its merger with the search firm Baines Gwinner collapsed last year, Heidrick has been building up its financial services expertise, now part of Heidrick's Global Financial Services Enterprise.