Locate Guernsey says it helped 35 wealthy people relocate to the island in 2019.
The organisation is part of Guernsey's Committee for Economic Development and works to attract wealthy individuals to live and work in the island.
The sale of houses on the open market generated more than £1.2 million in document duty for the exchequer - a rise of more than £422,000 on the previous year.
Deputy Charles Parkinson, President of the Economic Development Committee, praised the results.
Locate Guernsey received 222 enquiries over the course of 2019 from people in the UK and across the world.