2/24/2018 S-1 Table of Contents Class A common stock on all matters submitted to our stockholders for a vote. The Class A common stock and Class B common stock vote together as a single class on all matters submitted to a vote of our stockholders, except as may otherwise be required by law. * Represents beneficial ownership of less than one percent (1%) of the outstanding shares of our common stock. (1) Consists of (i) 13,172,325 shares of Class B common stock held by the Houston Remainder Trust dated 12/30/2010, for which Mr. Houston serves as trustee, (ii) 113,222,113 shares of Class B common stock held by the Andrew W. Houston Revocable Trust dated 9/7/2011, for which Mr. Houston serves as trustee, (iii) 750,750 shares of Class B common stock held by the Houston 2012 Irrevocable Children’s Trust dated 4/12/2012, for which Mr. Houston serves as trustee, and (iv) 15,500,000 shares of Class A common stock underlying RSAs. (2) Consists of (i) 4,351,205 shares of Class B common stock held by the Arash Ferdowsi Remainder Trust dated 3/21/2011, for which Mr. Ferdowsi serves as trustee, (ii) 47,054,877 shares of Class B common stock held by the Arash Ferdowsi Revocable Trust dated 4/20/2012, for which Mr. Ferdowsi serves as trustee, and (iii) 6,600,000 shares of Class A common stock underlying RSAs. (3) Consists of (i) 259,067 shares of Class B common stock held by the Paul E. Jacobs Trust dated November 7, 2014, for which Mr. Jacobs serves as trustee, (ii) 40,000 shares of Class B common stock held by Mr. Jacobs, and (iii) 24,400 shares of Class B common stock that will be net issued upon the vesting of RSUs within 60 days of January 31, 2018. (4) Consists of (i) 184,049 shares of Class B common stock held by Annox Capital, LLC, or Annox, which will convert into an equivalent number of shares of Class A common stock in connection with the Capital Stock Conversion and (ii) consists of 22,356 shares of Class B common stock that will be net issued upon the vesting of RSUs within 60 days of January 31, 2018. Mr. Mylod, a member of our Board of Directors, is the managing member of Annox and has sole voting and investment control over the shares held by Annox. (5) Consists of 22,356 shares of Class B common stock that will be net issued upon the vesting of RSUs within 60 days of January 31, 2018. (6) Excludes shares listed in footnote 9 below, which are held by entities affiliated with Sequoia Capital. Mr. Schreier, one of our directors, is a non­managing member of SC XII LLC. (7) Margaret Whitman was elected to the Board of Directors in September 2017. (8) Consists of (i) 182,050,446 shares of Class B common stock beneficially owned by our executive officers and directors, (ii) 136,327 shares of Class B common stock subject to options that are immediately exercisable within 60 days of January 31, 2018, and (iii) 1,685,401 shares of Class B common stock that will be net issued upon the vesting of RSUs within 60 days of January 31, 2018. (9) Consists of (i) 114,268,720 shares of Class B common stock held by Sequoia Capital XII, L.P., or SC XII, (ii) 12,212,722 shares of Class B common stock held by Sequoia Capital XII Principals Fund, LLC, or SC XII PF, and (iii) 4,275,742 shares of Class B common stock held by Sequoia Technology Partners XII, L.P., or STP XII. SC XII Management, LLC, or SC XII LLC, is the general partner of each of SC XII and STP XII, and the managing member of SC XII PF. As a result, and by virtue of the relationships described in this footnote, SC XII LLC may be deemed to share beneficial ownership of the shares held by SC XII, SC XII PF, and STP XII. The address for these entities is 2800 Sand Hill Road #101, Menlo Park, California 94025. (10) Consists of (i) 2,453,503 shares of Class B common stock held by Accel Investors 2008 L.L.C., or AI 2008, (ii) 22,159 shares of Class B common stock held by Accel Investors 2010 L.L.C., or AI 2010, (iii) 15,748 shares of Class B common stock held by Accel Investors 2013 L.L.C., or AI 2013, (iv) 148,283 shares of Class B common stock held by Accel XI L.P., or Accel XI, (v) 11,140 shares of Class B common stock held by Accel XI Strategic Partners L.P., or Accel XI Strategic, (vi) 23,683,466 shares of Class B common stock held by Accel X L.P., or Accel X, and (vii) 1,794,568 shares of Class B common stock held by Accel X Strategic Partners L.P., or Accel X Strategic, and together with AI 2008, AI 2010, AI 2013, Accel XI, Accel XI Strategic, and Accel X, the Accel Entities. Accel X Associates L.L.C., or Accel X Associates, is the general partner of Accel X and Accel X Strategic and has the sole voting and investment power. Andrew G. Braccia, Kevin Efrusy, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong are the managing members of Accel X Associates, AI 2008, and AI 2010 and share voting and investment powers over such shares. Accel XI Associates L.L.C., or Accel XI Associates, is the general partner of Accel XI and Accel Strategic and has the sole voting and investment power. Andrew G. Braccia, Sameer K. Gandhi, Ping Li, Tracy L. Sedlock, and Richard P. Wong are the managing members of Accel XI Associates and AI 2013 and share voting and investment powers over such shares. The address for these entities and individuals is 428 University Ave., Palo Alto, California 94301. (11) Consists of (i) 9,004,474 shares of Class A common stock held of record by 63 funds and accounts advised or sub­advised by T. Rowe Price Associates, Inc., or TRPA; and (ii) 10,596,485 shares of Class B common stock held of record by 62 funds and accounts advised or sub­advised by TRPA. TRPA serves as investment adviser with power to direct investments and/or sole power to vote the securities owned by these funds and accounts. The T. Rowe Price Proxy Committee develops the firm’s positions on all major proxy voting issues, creates guidelines, and oversees the voting process. Once the Proxy Committee establishes its recommendations, they are distributed to the firm’s portfolio managers as voting guidelines. Ultimately, the portfolio managers for each account decide how to vote on the proxy proposals of companies in their portfolios. More information on the T. Rowe Price proxy voting guidelines is available on its website at troweprice.com. The T. Rowe Price portfolio managers of the funds and accounts that hold our securities are collectively listed as follows: Joseph B. Fath, Taymour R. Tamaddon, Paul D. Greene, Donald J. Peters, Henry M. Ellenbogen, Brian W. H. Berghuis, Kennard W. Allen, Joshua K. Spencer, and Justin White. For purposes of reporting requirements of the Securities Exchange Act of 1934, TRPA may be deemed to be the beneficial owner of all the shares listed above, however, TRPA expressly disclaims that is, in fact, the beneficial owner of such securities. T. Rowe Price Associates, Inc. is the wholly owned subsidiary of T. Rowe Price Group, Inc., which is a publicly traded 156 https://www.sec.gov/Archives/edgar/data/1467623/000119312518055809/d451946ds1.htm 164/235