Maxus, part of WPP’s GroupM unit, has agreed a deal to acquire Dutch media buying agency Helder Marketing & Communicatie.

Founded in 2006, the Amsterdam-based agency focuses on direct response and ROI evaluation, and also offers marketing consultancy, creative services and print management services.

In 2014, Helder reported annual revenues of €1.13m ($1.2m).

Maxus will merge its Netherlands operations with Helder from 1 January next year to create Maxus + Helder.

The agency said in a statement: “Current clients will continue to work with their familiar teams but will benefit from a broader base and a substantial expansion of in-house knowledge and services.”

It comes a week after Maxus launched a new branded content arm called Chorus. Based in London, the 11-strong team will be led by Maxus head of partnerships Laura Wade, and work with clients including Red Bull, MTV and Endemol Beyond.

Maxus London has also today moved to new offices in London’s Finsbury Square – see the agency’s tweet below.