Apttus, a cloud software company that automates the process of turning sales calls into signed contracts, has closed another $88 million in late-stage funding that CEO Kirk Krappe said will likely be its last infusion before an initial public offering in the first half of 2017.

Apttus specializes in “quote-to-cash” software applications. That’s a fancy way of saying it automates tasks such as building sales proposals, calculating pricing that is customized for specific deals, generating invoices, and managing customer contracts. The firm has more than 600 customers—100 of them within the Fortune 500—including foodservice company Aramark and cloud software pioneer Salesforce.