Shares in NZX-listed a2 Milk tumbled after international food giant Nestle confirmed it is launching an A2 infant formula product.
The sharp decline in the stock — which has the biggest weighting on the S&P/NZX 50 Index (12 per cent) — was a factor in driving an already soft share market lower still.
The company's shares closed down 90c, or 6.5 per cent, at $12.94.
Nestle earlier confirmed to the Herald that it was launching an A2 product.
"I can confirm that we are currently launching an A2 product under the Illuma brand," a spokeswoman for the company in Sydney said. No other details were immediately at hand.
Salt Funds' managing director Matt Goodson said a2 Milk's share price was being driven down on the news from Nestle and fears that there may be others waiting in the wings to launch similar products.