According to a person familiar with the matter, activist investor Mantle Ridge has built a stake of more than $1 billion in the technology services firm Cognizant Technology Solutions Corp.

Cognizant is a global IT services company that provides consulting, business process outsourcing, and information technology services. Its current market cap is USD 41.55 billion.

The person, who asked not to be identified because the information wasn’t public, said Mantle Ridge, which isn’t planning to nominate directors to Cognizant’s board, is pushing the company to improve its margins.

Representatives for New Jersey-based Cognizant didn’t immediately respond to requests for comment on Mantle Ridge’s stake, which the Wall Street Journal reported earlier. A spokesperson for Mantle Ridge declined to comment.