The company said it was in compliance with the NZ listing rules and that cover continuous disclosure obligations.
A2 Milk's managing director and chief executive Geoff Babidge said at the company's first-half result in February that due to the increasing scale of is infant nutrition business, the company was looking at participating in manufacturing capacity and capability.
As it stands, a2 Milk is supplied by Synlait Milk, in which it has a 19.8 per cent stake. Synlait last traded at $7.35, down 10c. A2 Milk share were down 88c at $19.45.
Mataura Valley Milk was last year put up for sale through Macquarie Capital and DG Advisory, with an information memorandum circulating in the market.
The company is majority owned by China Animal Husbandry Group and New Zealand company Bodco Dairy.
Gore-based Mataura, which moved into production in 2018, said last year it needed an additional $12m in funding to cover expected production and operational costs.
Accountant Aaron Moody and alternate director for Mataura Valley Milk and minority shareholder, local business personality Ian "Inky" Tulloch, last year confirmed the company was seeking a strategic investor to provide an equity injection.