On 1 December 2012, ICANN and VeriSign, Inc., entered into an Unsponsored Registry Agreement under which VeriSign, Inc. operates the .com top-level domain. The agreement is set to expire on 30 November 2018 with a 6-year presumptive renewal right.
https://www.icann.org/public-comments/com-amendment-2016-06-30-en
https://www.icann.org/public-comments/com-amendment-2016-06-30-en