X0306 4 2013-06-03 0 0001491576 TESARO, Inc. TSRO 0001184592 SEIDENBERG BETH C C/O TESARO, INC. 1000 WINTER STREET, SUITE 3300 WALTHAM MA 02451 1 0 0 0 Common Stock 2013-06-03 4 A 0 1006 0 A 13327 D Common Stock 1652837 I See footnote Common Stock 139828 I See footnote Employee Stock Option (right to buy) 46.22 2013-06-03 4 A 0 10000 0 A 2013-06-03 Common Stock 10000 10000 D The Reporting Person has elected to receive common stock in lieu of cash for board retainers and fees otherwise payable in cash. The shares are held directly by Kleiner Perkins Caufield & Byers XIV, LLC ("KPCB XIV"). The managing member of KPCB XIV is KPCB XIV Associates, LLC ("KPCB XIV Associates"), of which the Reporting Person is a member. The voting and dispositive control over the shares is shared by the members of KPCB XIV Associates. The shares are held for convenience in the name of "KPCB Holdings, Inc. as nominee." The Reporting Person disclaims beneficial ownership over all Issuer shares held for convenience in the name of "KPCB Holdings, Inc. as nominee," except to the extent of her pecuniary interest therein and this filing is not an admission that the Reporting Person is the beneficial owner of these shares for the purposes of Section 16 or for any other purpose. The shares are held directly by KPCB XIV Founders Fund, LLC ("KPCB XIV Founders"). The managing member of KPCB XIV Founders is KPCB XIV Associates, LLC ("KPCB XIV Associates"), of which the Reporting Person is a member. The voting and dispositive control over the shares is shared by the members of KPCB XIV Associates. The shares are held for convenience in the name of "KPCB Holdings, Inc. as nominee." The option vests on the earlier of the one-year anniversary of the date of grant and the next annual meeting of the Issuer's stockholders, subject to the Reporting Person's continued service on the Issuer's board of directors. /s/ Paul Vronsky, Attorney-in-Fact 2013-06-05