New Zealand Insulators is majority owned by the Tiri Group www.tiri.co.nz
In July 2011 NZI's Manager Greg Howell acquired a minority shareholding.

Nelson-based Tom Sturgess is the primary shareholder of Tiri, a collection of ten industrial businesses around New Zealand. Tiri's CEO Kevin Tennant & CFO Rob Astley are also Tiri shareholders.

Tiri is professional and commercial, whilst remaining very Kiwi. Thankfully Tom, Kevin & Rob concentrate only on what's right for their businesses - no politics, corporate bluster or layers of middle management.

Apart from New Zealand Insulators, the other Tiri companies include A&G Price, Masport, RH Freeman, Masport Foundries, Electrical Supply Corp, Pacific Wallcoverings, Viking Conveyors, Viking Roofspecs & Skellerup Viking Containment.

On top of his industrial business interests, Tom Sturgess is also a significant private pastoral landowner, with seven South Island sheep & beef holdings from Farewell Spit to Otago. Tom's farming assets go under the badge Lone Star Farms and Lone Star have a website which details this impressive venture www.lonestarfarms.co.nz

During its 88 years NZI has been owned by the following companies:
1924 - National Electric & Engineering (NEECO)
1967 - Cable Price Downer
1987 - Brierley Investments
1993 - Skellerup Group
1995 - Maine Investments, difficult chapter
1998 - Viking Pacific
2002 - Tiri Group (as a JB Were Equity Fund)
2007 - Tiri Group (Tom Sturgess)