X0306 4 2013-06-03 0 0001491576 TESARO, Inc. TSRO 0001553053 Alleva Lawrence M C/O TESARO, INC. 1000 WINTER STREET, SUITE 3300 WALTHAM MA 02451 1 0 0 0 Common Stock 2013-06-03 4 A 0 1114 0 A 20214 D Employee Stock Option (right to buy) 46.22 2013-06-03 4 A 0 10000 0 A 2023-06-03 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 and has elected to defer delivery of that common stock until the earlier of the date that he separates from service on the Issuer's board of directors and January 10, 2020. 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/ Richard J. Rodgers, Attorney-in-Fact 2013-06-05