Nucleus chairman Vincent Derudder said the aim of the venture, which was agreed with TriCap owner Alvar Virkus, was for the two groups of companies to merge.
The venture was agreed in November last year and has now come into full effect.
The two companies will continue to operate under their own brand names, with Derudder describing the venture as “behind the scenes”.
He said the pair will be working on similar plans and solutions within different sectors of the European market, as well as working towards creating a computerised management system.
Derudder and Virkus will both be beneficial owners at the firm, with Derudder continuing his role as chairman and Virkus acting as group chief executive.
Romain Bichel, managing director at TriCap administration SPC, part of the Trilliance Capital group, will take on administration duties for the new group.
Diane Jacobs will be responsible for business development and sales alongside her current position at Nucleus as head of business development.
Derudder said the venture’s holdings and business activities will be domiciled in Luxembourg.
He added: “The intention is not to change anything within our flagship companies.
“Our brands are already well established and recognised by industry professionals so we will continue to operate under our original titles.
“We are working on similar markets and plans so it makes sense for us to work together.
“This year is an opportunity for us to achieve in spite of very adverse conditions.
Nucleus Holdings is a financial services holding company with private equity investments in a number of Insurance financial ventures across Europe.
Trilliance Capital Group is a customized financial solutions company aimed at assisting high net worth individuals. The group incorporate three companies: Triliance Capital AG, Trilliance Trust AG and TriCap Assurance SPC.