Citigate won the account following a competitive pitch and replaces incumbent Brunswick. It is charged with raising Legg Mason's profile across Europe, through a 'programme of thought leadership'.
The account will be led by Citigate executive director Phil Anderson, with support from directors Marisa Elliott and Stephen Sheppard. They will report to Legg Mason's European head of comms Lucy Davidson.
Baltimore-headquartered Legg Mason is a global investment management firm with assets under management totalling $923bn as of 30 June. The Legg Mason family encompasses 10 wholly owned independent investment subsidiaries.
'The Citigate team has been brought in to provide a creative approach to raising our profile across Europe,' said Davidson. 'It will also continue to raise awareness of the Legg Mason brand and that of our affiliates across Europe.'