Blackstone and Vista Equity Partners are acquiring software maker Smartsheet for $8.4 billion in cash, or $56.50 per share; the deal is expected to close in Smartsheet's fiscal fourth quarter.

Smartsheet announced Tuesday that it agreed to be acquired by private equity companies Blackstone and Vista Equity Partners in deal valued at $8.4 billion. The acquisition will make Smartsheet a private company again, six years after the Bellevue, Wash.-based enterprise software company went public.

Blackstone Inc. and Vista Equity Partners have agreed to acquire software provider Smartsheet Inc. for about $8.4 billion in one of the year’s largest take-private deals.