New statistics on Maori businesses are providing an insight into the economic strength of more than 1000 Maori authorities.

Maori assets grew 15.5% in 2014 to reach $15b.

It's the second reported year of asset growth with an increase of $1.6b the year before.

The main contributor to the growth was assets such as goodwill, trademarks, shares and long-term bonds and loans.