Concord Management and Consulting on Wednesday pleaded not guilty to a charge brought by special counsel Robert Mueller that the company was party to a conspiracy to defraud the United States.

Concord is one of three Russian companies and 13 Russians indicted in February by Mueller on charges stemming from interference in the 2016 presidential election using social media. The company, which was represented in federal court by attorney Eric Dubelier, is the only defendant that has yet to appear in court.