It will be headed up by Nathan Tarr, who joined Guardian in July 2017, having previously worked for deVere Group since 2009.
He was latterly a senior investment adviser for deVere in Miami for two years, leaving shortly before the company closed its Florida operation.
Describing the Miami office as a “very exciting time”, Tarr said: “The US business market is arguably the largest in the world, but also one of the most difficult. It will take time to get it right, however, within weeks of opening we have seen massive demand across all the states.”
The company said there is “an overwhelming demand from clients in the US market for advice around existing pension options”.
It added that there are many nationalities in the US that have spent time living and working in the UK and there is a lack of knowledge and experience among local US advisers in dealing with cross-border issues.
Gavin Pluck, managing director of Guardian, said: “I am very much looking forward to working with the team to build the GWM US business into one of the largest in group over the coming years. Everyone is very focused and the results are already providing significant positive feedback.”