New Zealand's benchmark stock index rose to a record, with Fletcher Building and Sky Network Television gaining while Scales and NZX dropped.
The S&P/NZX 50 Index gained 21.19 points, or 0.2 per cent, to an all-time high of 9,084.04. Within the index, 22 stocks rose, 18 fell and 10 were unchanged. Turnover was $108.4 million.
Trump's 25 per cent tariffs on US$34 billion ($49.9b) of Chinese goods were imposed from 4pm Friday New Zealand time. In a statement after that deadline passed, China's Commerce Ministry said the country was "forced to make a necessary counterattack" but gave no immediate details of its plans.
"Markets are anxiously awaiting the implementation of the US and then Chinese tariffs tonight, but the market is pretty flat on light volume as a few participants start to head off on holiday," said Shane Solly, director, portfolio manager & research analyst at Harbour Asset Management.
"We do see a relatively strong global economy in the scheme of things, and the New Zealand economy is strong even though it's slowing - we need to be careful about getting too negative about the series of events that's out there."