UM has retained the Lego account, AdNews understands.
Agencies were invited to pitch late last year for the account, thought to be worth in the region of $10 to $15 million.
The toy brand's global procurement boss was in Sydney ahead of the pitch, which involved a number of networked agencies with three making the shortlist.
Lego's local marketing director could not be contacted to confirm the news ahead of publication.
Fellow Mediabrands outfit Airbourne also has Lego on its books.
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