Bellevue, Wash.-based workflow automation firm Nintex has acquired AssureSign, an e-signature firm based mostly in Atlanta. Phrases of the deal weren’t disclosed. Based in 1999, AssureSign has greater than 100,000 lively month-to-month customers and 500 clients. Nintex will use the acquisition to supply native e-signature functionality inside its platform. It’s the fourth acquisition for Nintex since funding agency Thoma Bravo bought a majority stake in firm three years in the past. Nintex purchased K2 Software program final yr. Nintex has 10,000 clients and generates greater than $250 million in annual gross sales.