"Without much company news to react too, general order flow seems to be dictating prices in a bit of a mixed day," he said.
Retirement operator Summerset Group led the market higher, up 2.7 per cent at $5.70. Volume was just over 146,000 shares, less than a third of its average the past three months.
Index heavyweight A2 Milk rose 0.8 per cent to $16.61. About 997,000 shares changed hands, compared with an average 713,000 the past three months. The stock has jumped 9 per cent since UBS raised its recommendation to 'buy' from 'neutral' and put a $17.50 target price on it mid-week.
Leading the decliners today was Trustpower, down 4.3 per cent at $7.14. The country's fifth-largest energy retailer warned a mild, dry June quarter could push full-year earnings toward the lower end of guidance. Hydro generation in the quarter was 28 per cent lower than a year earlier, while demand was also soft, it said.
"Those results are not quite what the market was expecting," Burke said.
The firm's larger rivals, which have benefited from investor demand for strong-yielding defensive stocks in recent weeks, generally fell.
Meridian Energy, the country's biggest hydro generator, fell 1.2 per cent to $4.82. About 1.35 million shares changed hands, a little below average
Contact Energy fell 0.1 per cent to $7.79 and Genesis Energy fell 0.4 per cent to $3.495. Mercury NZ rose 0.4 per cent to $4.65.
Only three other stocks traded on more than a million shares. Sky Network Television was unchanged at $1.15, as was Kiwi Property Group at $1.615.
Spark New Zealand rose 1.9 percent to $3.97. The 1.37 million shares traded was about a third its average volume in recent months.
Outside the benchmark index, Tilt Renewables fell 1.2 per cent to $2.46. The company today said June-quarter wind generation was up 4 perc ent on last year and 1 per cent ahead of long-term expectations. Production in New Zealand was weak and 7 per cent below long-term expectations.
Health products maker Blis Technologies fell 2.7 per cent to 3.6 cents. An area around the firm's South Dunedin site was closed early today after an unstable chemical was destroyed by emergency services in the street. The firm said staff identified the risk during a review of chemical stock and experts were called in as per the company's protocols.
Fleet management technology company Eroad rose 1.3 per cent to $3.08 after yesterday reporting a 6 per cent rise in June-quarter unit sales.
New Zealand Oil & Gas, subject of a takeover offer from major shareholder OG Oil and Gas, rose 1.7 per cent to 61.5 cents. OGOG is offering 62 cents.