A class-action lawsuit filed in early October in Tennessee accuses software company Optimal Blue and some of the nation’s largest lenders of violating federal antitrust laws through an alleged mortgage price-fixing scheme.

According to the complaint, filed Oct. 3 in a U.S. district court in Nashville, the defendants “exploited their control of the residential mortgage industry to orchestrate a price-fixing scheme that has inflicted substantial damages on Plaintiffs and the Class.” 

The plaintiffs are borrowers who obtained mortgages between 2022 and 2025.

Optimal Blue was previously owned by Black Knight before being sold to Constellation details ⇒