Transact saw £1.1bn of inflows in the first half of the year and grew its funds under direction to £61bn.
The platform's parent company IntegraFin Holdings published its results for the six months to March 31 this morning (May 22).
Funds under direction were up 13 per cent from £54bn as at March 31, 2023.
Despite this, net new business inflows were down 13 per cent to £1.1bn for the half year to March 31, compared with £1.6bn the previous year.
The company said "muted flows" were down to the wider challenging macro-environment of higher interest rates and cost of living leading to an increase in off-platform withdrawals.
The results read: "These withdrawals, in combination with an increasingly competitive platform market and with adviser consolidation, resulted in muted net inflows to the platform.
"Nonetheless, FUD and revenues remain within projection. The group will continue to monitor and respond to any new developments which may impact the group."
Registered advisers on the platform increased by 286 in the period to 7,849.
Alexander Scott, chief executive of IntegraFin Holdings, said the company has aims to become the top provider of platform software for advisers in the UK.
He said: "Transact continues to grow its client and adviser numbers, as well as deliver resilient net inflows over the period.
"The record levels of client and adviser numbers also present us with a solid pipeline for future flows.
"We remain dedicated to ensuring positive consumer outcomes, underpinned by our platform digitalisation programme which enhances service and efficiency.
"Above all, we are focused on our goal of being the number one provider of investment platform software and services for clients and UK financial advisers."
Overall, IntegraFin recorded a group revenue of £70.4mn, 6 per cent higher than the same period in 2023.
The firm said this was driven by higher average daily funds under direction, which was £57bn compared with £52.6bn the previous year.
tara.o'connor@ft.com
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