The NZX 50 fell 11 points, or 0.1%, to close at 13,611 on Wednesday, erasing gains from the previous session, mainly weighed down by losses in consumer staples, materials, utilities, and healthcare.
The broader index retreated from its highest level since February 27, reached a day earlier, tracking a decline in US stock futures.
Traders awaited the release of New Zealand's consumer data for May, due later this week.
However, gains in consumer discretionary, industrial, and technology stocks helped limit the decline.
Easing oil prices also capped the losses as inflation concerns subsided, reducing expectations of an interest rate hike.
Tuesday's data also helped limit the losses, as New Zealand's business confidence surged to its highest level since February.
Among the biggest laggards were ANZ Group (-3.3%), Meridian Energy (-2.1%), Westpac Banking Corp.
(-2.4%), Fletcher Building (-3.2%), A2 Milk (-1.9%), Chorus (-1.3%), and Fisher & Paykel Healthcare (-1.2%).