The Ōtaki & Porirua Trust Board was established as a creation of the Ōtaki & Porirua Trusts Act 1943.

The Board manages, on behalf of its beneficiaries, a portfolio of land-based assets. These include dairy and beef farms, land leases and a few residential rental properties.

The core business of the Ōtaki & Porirua Trust Board is to provide Post-Primary Education Scholarships to the children of Te Atiawa, Raukawa ki te Tonga and Ngāti Toa Rangatira referred to as ART.