The stock exchange could require all listed firms to report the gender makeup of their boards and senior management.
Women hold 9.3% of board directorships at New Zealand's 100 largest listed companies - a figure that's remained relatively static for the last two and a half years.
NZX chief executive Mark Weldon says investors may find gender diversity information useful and a diversity of views and challenges is essential as complexity grows.
Mr Weldon says the proposed change will be put out for consultation in February as part of the stock exchange's biannual rules review.
Minister of Women's Affairs Hekia Parata applauds the move, which she says should help to improve diversity beyond just listed companies.
She says this type of leadership being taken by key business leaders will inform other parts of the business sector and of all organisations wanting to improve the quality of their governance.