It was too early to say if there would be any job losses, Barnes said.
Perpetual Trust employs 60 people across five offices while Guardian Trust has 180 staff in 14 offices. Both companies have their head offices in Auckland.
Perpetual Trust suffered brand damage in the wake of the finance company collapses as it was the trustee company of many of those which went into receivership.
Barnes said the company no longer operated in the corporate trustee space and ran a purely private client businesses which revolved around wills and trusts.
Barnes said retail revenues from the private client business of Perpetual had barely moved over the last five years despite the company going through hard times including the Christchurch earthquakes where it lost staff and records.
Bringing the two companies together would mean there was more money for investment and scale to introduce new ideas to the New Zealand market, he said.