An investor group led by Vestar Capital Partners LLC is negotiating to potentially acquire market research company Information Resources Inc., which does business as IRI, from New Mountain Capital LLC, Bloomberg News reported, citing undisclosed sources.

The sources told the news outlet that a transaction for the big data and predictive analytics solutions provider, which does business as IRI and was bought by New Mountain in 2011, could be announced soon. However, the deal value remains unclear.

Representatives for both private equity firms did not comment on the matter, while a representative for IRI did not respond when asked for comment, the report noted.