Partners Group Holding AG (SWX:PGHN) is exploring the sale of USIC LLC, which helps locate and prevent damage to underground infrastructure with a focus on utilities, according to people with knowledge of the matter. The investment firm is working with advisers to solicit interest from potential suitors in the Indianapolis-based business, which could fetch more than $4 billion, including debt, said one of the people, all of whom requested anonymity to discuss the effort. The company, led by President and Chief Executive Officer Mike Ryan, operates in 48 U.S. states and Canada, its website shows.

A Partners Group spokeswoman declined to comment.