2/24/2018 S-1 Table of Contents to the completion of this offering, but no offering periods under the Class C ESPP will commence unless and until otherwise determined by our Board of Directors. Our 2018 Plan and ESPP each provides for annual automatic increases in the number of shares of our Class A common stock reserved thereunder, and our 2018 Plan also provides for increases to the number of shares of our Class A common stock that may be granted thereunder based on shares under our 2008 Equity Incentive Plan, or our 2008 Plan, and 2017 Plan that expire, are forfeited, or otherwise repurchased by us, as more fully described in the section titled “Executive Compensation—Employee Benefits and Stock Plans.” Additionally, if and when our Board of Directors determines to use our 2018 Class C Plan and Class C ESPP, such plans will provide for annual automatic increases in the number of shares of our Class C common stock reserved thereunder. 51 https://www.sec.gov/Archives/edgar/data/1467623/000119312518055809/d451946ds1.htm 58/235