Federal regulators say Tempur Sealy's acquisition of Mattress Firm would raise prices for "millions of consumers."

The Federal Trade Commission has voted to block a multibillion-dollar deal involving a Houston-based company — but surprisingly, it’s not an energy company.

The $4 billion merger, announced in May 2023, would combine the mattress manufacturer, which owns brands Stearns & Foster and Tempur-Pedic, with the nation’s largest mattress retailer.