New Zealand shares fell to a five-week low as rising concerns about global growth due to heightened US-China trade tensions extended into Asian markets.

Export-focused A2 Milk dropped.

The S&P/NZX 50 index declined 107.3 points, or 1.2 per cent, to 8,660.02. It was the lowest close since October 30.

Within the index, 38 stocks fell, nine gained and three were unchanged. Turnover was quieter than usual at $78.7 million.

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Wall Street lost ground on Friday and Asian markets followed suit on concerns that Canada's arrest of Huawei global chief financial officer Meng Wanzhou could derail the temporary truce between the US and China.

US authorities are seeking her extradition over claims she was involved in violating US sanctions against Iran.

China on Sunday demanded the United States should withdraw the arrest warrant. The flare-up in tensions come just as the two nation's kick of 90 days of negotiations.

The S&P 500 Index fell 2.3 per cent on Friday, while across Asia today, Australia's S&P/ASX 200 was down 2.2 per cent in afternoon trading and Hong Kong's Hang Seng declined 1.4 per cent.

Hamilton Hindin Greene director Grant Williamson said while the New Zealand market was down it was outperforming Australia.

"We've probably held up reasonably well but certainly, the sellers are in charge of the market today," said Williamson.

Dual-listed companies were among those hardest hit. Sky Network Television led the market lower, sliding 7.1 per cent to $2.11 and Fletcher Building dropped 3.4 per cent to $4.56, both on light trading volumes.

A2 fell 4.1 per cent to $10.57 on half its average trading volume.

The milk products marketing firm today announced the departure of general manager of international development Simon Hennessy and head of emerging markets business development Michael Bracka.

Australia & New Zealand Banking Group dropped 3.8 per cent to $25.95 and Westpac Banking declined 3.4 per cent to $26.14.

Spark New Zealand was the most traded stock, with 2.3 million shares changing hands compared to the 3 million 90-day average. Spark rose 1.7 per cent to $4.27, posting the biggest gain on the day. "It is really quite defensive and investors are considering Spark to be quite a safe haven, as it produces an extremely good dividend income," Willamson said.

"It is performing particularly well and has done all the way through this market correction in the past couple of months."

Of other stocks with more than 1 million volume, Meridian Energy fell 1.2 per cent to $3.22, Auckland International Airport dropped 2.1 per cent to $7.10 and Contact Energy decreased 0.4 per cent to $5.70. Air New Zealand fell 2.2 per cent to $2.965, a month low.

Brent crude oil prices rose 0.5 per cent to US$61.96 a barrel in Asia trading after Opec producers and other nations, including Russia, agreed to cut output by 1.2 million barrels a day from January. The airline is also in pay negotiations with its engineers who are threatening to down tools over Christmas. Trade Me declined 1.9 per cent to $6.07.

Veteran chief executive Jon Macdonald will stay on a little longer while the online marketplace considers competing takeover bids.

Retailers were mixed after Paymark figures showed a muted start to the Christmas spending season. Briscoe Group increased 0.3 per cent to $3.32, while Hallenstein Glasson dropped 8.3 per cent to $4.45 and Warehouse Group was down 1.5 per cent at $2.02. Kathmandu Holdings was unchanged at $2.66.