WPP AUNZ, the local arm of the world's biggest advertising group, has been questioned by the ASX over a spike in trading of its shares.
The ASX noted a rise in the share price to $0.30 from $0.23 on Thursday last week.
The jump was accompanied by a "significant" increase in the volume of WPP shares traded.
The exchange asked WPP if it was "aware of any information" not announced to the market which could explain the recent trading.
Linda Gough, company secretary at WPP, replied that the company had no such information.
She also confirmed the company was complying to listing rules and that it had no other "explanation" for the recent trading activity.
WPP AUNZ shares have traded at a high of $0.69 and a low of $0.185 over the last 12 months.
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