Trading in Synlait Milk shares has been halted pending an announcement from the company.
The trading halt was put in place at 2:47pm this afternoon, the NZX said.
The exchange said the stock would remain in a trading halt until such time as the company makes an announcement, or the start of trading on Wednesday, whichever happens first.
The shares traded today at $5.91, up 41c since Friday's close, having earlier traded as high as $6.00.