Staff cuts will reach into 'double figures' across the business and is likely to include two senior level roles, confirmed David Hackett, deputy chariman of Grass Roots.
As a consequence, Amber Keats - who featured in C&IT's A-List in 2012 - has been promoted to head of event management and Karen Giles will become head of a new Participant Engagement unit.
The news follows chairman David Evans's departure from the company last month, and the appointment of a spate of WPP directors at the company. Andy Lister was subsequently made Grass Roots' chief operating officer.
"Over the last 15 months, we have made significant changes to the structure and business operating model and we now need to achieve further efficiencies to ensure our competitiveness," said David Hackett, Grass Roots' deputy chairman - events.
He added that he regrets that there will also be departures. "We have to rationalise operating costs and implement revised delivery models to ensure we can deliver best value for our clients. Grass Roots is renowned for excellent operational delivery however in the current marketplace we must operate faster, leaner and better to meet client expectations. That means operating more efficiently and with lower overheads, so we are looking to streamline the business. As a result, a number of jobs have been placed at risk from across the business."
Hackett concluded: "Over the last six months, we have attracted a number of significant new clients and we believe that these changes will further enhance our competitive position in the marketplace'.