A2 Milk, which has been reporting stellar baby formula sales growth in China, was the worst performer on the NZX yesterday, with its shares falling 6.3 per cent to close $1.78. Shares in ASX-listed baby milk marketer Bellamy's Australia closed down 10.8 per cent at A$8.88, while units in Murray Goulburn's listed trust were down 8.2 per cent at A$2.01.
Health supplements maker Blackmores, meanwhile, closed down 6.8 per cent at A$165.
"There's change and whenever there's change investors get nervous," said Harbour Asset Management's Shane Solly, adding that China's moves to improve consumer confidence around food imports were positive for New Zealand.
An A2 Milk spokesman said the company considered itself well-placed to meet the regulatory controls.
Jillian Laing, Fonterra's vice-president for Greater China Brands, said less than 1 per cent of the firm's products were sold through cross border e-commerce channels and the impact on its business was minimal. Units in the Fonterra Shareholders' Fund closed unchanged at $5.64 last night.
The Australian Financial Review reported that the latest regulatory changes form part of a pledge by Beijing, which entered a free trade agreement with Australia last year, to protect domestic retailers by imposing higher taxes on imports. It comes as a 1000-strong business delegation from Australia heads to China this week with Prime Minister Malcolm Turnbull.
Prime Minister John Key will be in Beijing and other Chinese cities next week as part of a visit that will include discussions around upgrading New Zealand's FTA with China, which took effect in 2008. Asked about the potential free trade implications of the e-commerce changes, a spokeswoman for Trade Minister Todd McClay said last night: "We are seeking more advice on this."