The stock exchange has queried a sharp rise in Diligent Board Member Services share price.
The US-based company's stock has risen about a quarter from $5.38 a share a week ago to $6.80 each on Monday.
The daily volume has shot up to 8.4 million since 7 March, from 67,000 a day in the year to date.
Diligent said it was not aware of any material information that ha not been released to the market that could have led to the share price gain.
