The portion held by managed funds has climbed from 14 per cent in 1997 and reflects "strong managed funds inflow from KiwiSaver."
Total funds under management soared 63 per cent to $9.4 billion at June 30 from a year earlier, the survey shows. The amount invested in New Zealand equities by managed funds jumped 59 per cent to $900 million.
Foreign ownership of New Zealand equities slipped 0.2 points to 35.9 per cent, with Goldman Sachs saying such holdings are in a downward trend that is likely to continue, amid a lack of new listings and merger & acquisition activity.
The government's plan to target the partial sell-down of SOEs to domestic investors will also reduce total foreign ownership, the firm said.
Upcoming listings include eco-light bulb manufacturer Energy Mad Ltd, which is trying to raise $6 million in an initial public offering, and is expected to list on October 3.
Retirement village operators Vision Senior Living and Summerset are rumoured to list in the future, while Fairfax Media Group has flagged it will sell a partial stake in online auction site Trade Me Ltd.
Companies in the NZX 10 Index account for more than 75 per cent of overseas ownership.