"At this stage there is no evidence to indicate offending. Should there be any new evidence that comes to light this will be assessed and acted on as required."
The statement said the decision was influenced by the indirect nature of many of the investments, with transactions taking place on secondary markets and not directly into the companies involved.
"A feature of fund management is the fact that fund managers generally buy their securities on traded markets, so these are shares traded between shareholders as opposed to providing funds to the companies that produce these weapons.
"Additionally, New Zealand fund managers also place money with offshore fund managers, who may undertake share trading on overseas markets, rather than the New Zealand fund managers investing directly."
The decision comes after the majority of KiwiSaver providers announced that, due to public concerns, they would be divesting client funds from stakes in companies making the controversial weapons.