Investment platform Third Financial has announced the signing of Mountstone Partners, a discretionary wealth firm with £400m in assets under management (AuM).

Mountstone has signed for an initial six-year term and Third Financial said that Mountstone’s transition to its platform “reinforces its commitment” to the high-net-worth wealth management market.

Other recent signings and renewals by Third Financial in the discretionary wealth management space include London-based asset manager 1Oak Group, B Corp wealth manager Downing, BRI Wealth Management, Irwin Mitchell Asset Management, and GHC Capital Markets.

The latest move also follows Third Financial’s recently announced proposed acquisition by Nucleus, one of the UK’s largest adviser platform groups with over £80bn of assets under administration.

Group CEO at Third Financial, Ian Partington, said: “Our sustained growth reflects our repeated recognition as the partner of choice for high-calibre wealth managers and advisers seeking stability and security in an otherwise tumultuous platform market. We understand our customers’ needs and fully appreciate the frustrations of the industry with technology that is often not fit for purpose.

“We are dedicated to the continuous development of our technology, which powers both our Model B offering and those firms who choose to use our software-only service, to ensure we stay firmly ahead of the ever-changing industry requirements.”

Mountstone founder, James Keen, commented: “We were looking for a tech-forward platform, with efficient and proactive personnel who could deliver the best service for our clients. This is what attracted us to Third Financial.

“We have been extremely impressed with its responsiveness throughout the implementation project.”

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