Summerset Holdings Limited (NZX: SUM) is a New Zealand retirement village and aged care service provider.

[1] Summerset Group Holdings Ltd was founded in 1994 by John O'Sullivan, a Wellington-based property developer[2] initially opening a small hospital in Levin that year and a similar one in Waikanae in 1995.

At the end of 2005 O'Sullivan and the small group of other shareholders sold the business to AMP Capital Investors for $125m.

In 2007 AMP sold the two original hospital sites in Levin and Waikanae (branded Millvale House) so the company could concentrate on its core business of retirement village offerings.

[5] Competition for Summerset in the New Zealand aged care sector includes Ryman Healthcare, Metlifecare, BUPA, Arvida and Oceania.