Berkshire Hathaway Unit Faces Revived Monopoly Claims From Rival

A Berkshire Hathaway-owned insulation company faces revived antitrust claims after the Tenth Circuit held that a district court improperly dismissed a monopoly claim against it.

In a Monday decision, the Tenth Circuit reversed the district court’s grant of summary judgment to Johns Manville Corp. based on a monopoly claim from competitor Thermal Pipe Shields. The decision remands the case for further litigation, suggesting it is headed for a trial.

A report from Thermal Pipe Shields, or TPS, showed that Johns Manville maintained more than 97% of the market for domestic calsil, or calcium silicate, as of August 2021—more than ...