Riverton farmer Leon Black is challenging incumbent directors Murray Taggart and Don Morrison for a seat on the Alliance Group board.
Mr Morrison, of Gore, and Mr Taggart, of Oxford, who is also Alliance Group's chairman, retire by rotation and both are seeking re-election.
Voter packs, along with information about the candidates, will be sent to farmer shareholders on November 24.
Voting closes on December 13 and the result will be announced at the company's annual meeting in Nelson on December 15.