"The New Zealand Initiative is supported by a foundation membership of major company chief executives," said Roundtable chairman Roger Partridge, who also chairs law firm Bell Gully, and the Institute's chairman Tony Carter, who formerly headed the Foodstuffs Cooperative and is chairman of Fisher & Paykel Healthcare.
Partridge and Carter will jointly chair the new body.
Partridge said both organisations "recognised that the New Zealand market was not big enough for two independent CEO think tanks and could see that by joining forces they could be much more effective."
"We found we had a strong sense of common purpose. We want to help shape the landscape and start a national conversation on ideas that have intellectual integrity and rigour and the potential for profound, positive long-term impact on the well-being of New Zealand," said Partridge.
The New Zealand Initiative would "build on the legacies of its two founding organisations and will focus on raising debate on public policy and contributing bold, rigorously-researched ideas to achieve a more prosperous future for New Zealand," said Partridge and Carter in a statement.