They would be separate to the existing milk share of $1.50 per kgMS and only tradeable when farms were sold. Over time the value of the investment shares would increase, exactly to the level of the retentions, which are currently at 30c per kgMS.
For example, a farmer who produced 100,000 kgMS would likely be issued with 30,000 $1 shares in the first year. If the retentions were kept at the same level, the next year he would be issued with a further 30,000 $1 shares - lifting the total value of his shareholding in the co-operative to $2.10.
Chairman Matt O'Regan said there would need to be a cap on how high that value was lifted to in order not to act as a barrier to entry for new suppliers so the proposal is to have a five-year review on the structure. Westland's constitution also provides for the board to withhold exiting share capital for up to five years to reduce the risk of mass redemption.
"We can't change the $1.50 per kgMS milk share, we'd have to have a shareholder vote to change that, but the company would have the right with this investment share which is fixed at $1 to determine each year how many we issue," O'Regan said.
He stressed the investment shares were still a concept and there would be widespread consultation with the co-operative's 425 farmer suppliers over the next six months and opportunity for them to have input. A special meeting will be held mid next year to vote on the proposal.
In the annual report out this week, O'Regan said the capital structure review was aimed at growing shareholder returns.
The dairy co-operative's substantial investment into increasing its capacity to produce high-value nutritional products was also helping grow returns, he said.
The increase in revenue was driven by higher milk volumes - up 21 per cent at 753 million litres, and the move towards higher value products which now contribute 14 per cent of sales volumes, compared to just 9 per cent four years ago.
The success of the co-operative's first full year of making nutritional products in its new drier at Hokitika had reassured the company it was on the right path towards more competitive and sustainable shareholder returns, O'Regan said. Work is well underway on an even bigger $102 million nutritional drier at Hokitika, the co-op's single biggest investment, which will be commissioned next September. The board has also approved a $40 million UHT plant to be operational at Rolleston in January 2016.