Heidrick & Struggles International Inc. (NASD: HSII), a Chicago-based executive search and leadership consulting firm, struck a deal to acquire Amrop Denmark, a Copenhagen-based provider of executive search and leadership consulting.

The deal is estimated at $8.4 million, according to a filing with the US Securities and Exchange Commission. Heidrick will pay $3.9 million at closing plus an estimated $4.5 million based on fee revenue generated from the business during the following two-year period.

The firms entered into the definitive agreement Sept. 19, according to the SEC filing.

All five Amrop Denmark partners are expected to join Heidrick & Struggles' Copenhagen office as partners. The firms expect the combined organization will be the largest leadership advisory firm in the Danish market with nine client-facing consultants and a total of 37 employees.

“Adding the Amrop Denmark team will further strengthen our ability to serve clients in the Nordic market with executive search and consulting services, including organization and team effectiveness, leadership assessment and development, and culture shaping,” Heidrick CEO Krishnan Rajagopalan said.

“More and more Danish companies want us to serve them outside Denmark in finding executives for their international operations,” said Peter Christiansen, managing partner of Amrop Denmark.