On December 12, 2017, Cabot Microelectronics Corporation announced the appointment of Scott D. Beamer as the Corporation's Vice President and Chief Financial Officer, effective as of January 15, 2018 (effective date), and the intention of William S. Johnson, the Corporation's Executive Vice President and current Chief Financial Officer, to retire. Upon the effective date of Mr. Beamer's appointment, Mr. Johnson will resign as an officer of the Corporation and will perform transition responsibilities for the Corporation until he retires from employment on January 5, 2019 (the retirement date). Mr. Beamer, age 46, has served as vice president and chief financial officer of Stepan Company from August 2013 to the present.

From January 2012 until June 2013, he served as assistant corporate controller at PPG Industries Inc. From June 2008 until December 2011, he served as chief financial officer and director of finance - PPG Europe at PPG Industries Inc. As of the effective date, Mr. Johnson will become a senior advisor, continuing to report to the corporation's chief executive officer.