On February 19, 2019, Mark Sullivan announced his intention to resign as the Carbon Black, Inc.'s Chief Financial Officer, Principal Accounting Officer, Executive Vice President, Treasurer and Assistant Secretary, effective March 11, 2019, in connection with his retirement. Mr. Sullivan is expected to remain with the Company through June 30, 2019 to ensure a smooth transition of his duties. The Company agreed to extend the exercise periods for each stock option awarded to Mr. Sullivan pursuant to the Company's equity plans and any applicable option agreements or stock-based award agreements that is vested as of Mr. Sullivan's last date of employment until March 31, 2020.

As of the date hereof, any other terms of Mr. Sullivan's retirement, including any changes to Mr. Sullivan's compensation during or following such Transition Period, have not been determined or approved. The company will file an amendment to this Current Report on Form 8-K disclosing such information when it has been determined. On February 19, 2019, the Board of Directors of the company elected Stephen Webber as Chief Financial Officer, Principal Accounting Officer, Executive Vice President, Treasurer and Assistant Secretary of the Company, effective as of the Transition Date.

Mr. Webber most recently served as Chief Operating Officer and Chief Financial Officer of BackOffice Associates, LLC since 2018. He has also served as Chief Financial Officer of Cynosure, Inc. between 2016 and 2017, and Virtustream, Inc. between 2015 and 2016. Prior to those positions, Mr. Webber held various senior finance leadership roles at EMC Corporation, including Senior Vice President of Finance, over a nearly twenty year career at that company.