In a trading update, the DFM said assets under management were £7.8bn at the end of September, up from £6.7bn six months earlier.
Net inflows for the period were £328.1m.
Group adjusted operating profit rose 21.9% to £5m. Revenue increased by 12.6% to £10.9m.
The group’s financial adviser support business Paradigm Consulting saw a 2.5% increase in membership over the six months.
Paul Hogarth, founder and chief executive at Tatton, said: "The last six months have been testing times for many businesses and our business model has proved to be resilient and capable of dealing with the challenges presented by the pandemic.
"We adapted seamlessly to the new trading environment and have maintained face-to-face engagement with our IFAs, where possible.
“We have also redeployed resources to direct online engagement, running multiple interactive virtual events and frequent video investment updates, which have been well received and have proved to be very successful."