NEW YORK—Revenues from Interpublic Group's PR firms, which include Weber Shandwick and Golin, showed double-digit growth in the third quarter of this year. 

The group's CMG division, which houses most of its PR firms, was up 9.9% on an organic basis, and 14.3% as reported. 

Within that, PR revenues showed a similar trend, said Weber Shandwick CEO Andy Polansky.

The results, which continue IPG's track record of strong PR performance, come after Omnicom's PR firms yesterday reported organic third quarter growth of 2.5% to $343m.

"Overall, we seem to be outperforming our holding company competitors in the PR space," Polansky told the Holmes Report, attributing much of Weber Shandwick's growth to existing clients.

"Approximately two-thirds of the growth is coming from existing clients and a lot of is driven by strength in social & digital," he said, noting a higher proportion of integrated marketing assignments.

"From a practice perspective, we're seeing a continued resurgence in technology, along with continued strength in healthcare, consumer, corporate and PA."

North America and Asia-Pacific, added Polansky, are driving the firm's revenue growth, particularly China, Brazil, New York, Chicago and Washington DC.