2/24/2018 S-1 Table of Contents We reserve the right, in our sole discretion, to modify or terminate the Cash Bonus Plan in total or in part, at any time. Any such change must be in writing and approved by the compensation committee. However, no modification or termination shall apply retroactively as to cause a forfeiture of an earned bonus. 401(k) plan We maintain a tax­qualified 401(k) retirement plan for all U.S. employees who satisfy certain eligibility requirements, including requirements relating to age and length of service. Under our 401(k) plan, employees may elect to defer up to all eligible compensation, subject to applicable annual Internal Revenue Code limits. We match a portion of contributions made by our employees, including executives. We intend for our 401(k) plan to qualify under Section 401(a) and 501(a) of the Code so that contributions by employees to our 401(k) plan, and income earned on those contributions, are not taxable to employees until withdrawn from our 401(k) plan. 149 https://www.sec.gov/Archives/edgar/data/1467623/000119312518055809/d451946ds1.htm 157/235