Qad Inc. , a provider of cloud-based software for the supply chain, said Monday it has agreed to be acquired by private-equity firm Thoma Bravo, in an all-cash deal with an equity value of $2 billion. Under the terms of the deal, Thoma Bravo will pay $87.50 per Qad share of Class A or Class B common stock. The stock closed Friday at $72.90 and was halted premarket for the news. The deal is expected to close in the fourth quarter.