Centrify, a Mountain View security company focused on integrating non-Microsoft platforms with Microsoft Active Directory management services, has raised $15 million in a third round of capital, reports PE Week.

This follows $22 million already raised.

Sigma led the round, and was joined by Mayfield Fund, Accel Partners and Invesco Private Capital.

Updated: VentureWire reports that Centrify’s customers include the National Institutes of Health, Verizon Wireless, PricewaterhouseCoopers LLC and the University of Chicago.