Wrightson general manager of strategy and corporate affairs Julian Daly said that was still the case.
"The board remains open to looking at all options identified within the scope of the review and no decisions have been made at this time," Daly said in an email.
"The board will continue to update the market as this develops."
Wrightson shares recently traded at 62c, valuing the company at $468 million, and are near the eight-year high 63c reached on February 28.
The rural services firm is indirectly controlled by China's Agria Corp, which owns a 50.2 per cent stake via Agria (Singapore).
It built a majority interest in 2011, paying 60c a share, having bought an initial 13 per cent stake in 2009 for $36m.
That shareholding is currently under review by the Overseas Investment Office over whether it still meets the regulator's 'good character' test after being delisted from the New York Stock Exchange last year.
The size of the stake would mean any buyer would be obliged to make a formal takeover bid under New Zealand's Takeovers Code.