The first half results, ending 31 March, showed the firm had increased funds against the same period last year from £29.7bn to £34.4bn an increase of 8.7% over the period.
Pre-tax profits rose 19.8%, from £18.7m to £22.4m.
Net inflows for the first half of the year stood at £1.81bn and the firm revealed it has 173,000 clients.
Dividends also increased by 8.5% from 5.9p to 6.4p.
Ian Taylor, chief executive, said: “We are pleased to announce a solid set of results for the first half of the year.
“Despite the backdrop of political uncertainty and stock market volatility, Transact has maintained strong positive H1 net inflows.
“We remain confident we are well placed to sustain growth as we move into the second half of the year.
“The board has declared a first interim dividend in respect of the six months to 31 March 2019 of 2.6 pence per ordinary share (H1 2018: nil) payable on 21 June 2019 to ordinary shareholders on the register on 31 May 2019.
“The ex-dividend date will be 30 May 2019.”