X0306 4 2016-03-16 0 0001576263 Mirati Therapeutics, Inc. MRTX 0001465837 Boxer Capital, LLC C/O CAY HOUSE, P.O. BOX N-7776 E.P. TAYLOR DRIVE LYFORD CAY NEW PROVIDENCE C5 BAHAMAS 0 0 1 0 Common Stock 2016-03-16 4 J 0 474158 0.00 D 757935 D On March 16, 2016, Boxer Capital, LLC ("Boxer Capital") transferred 474,158 shares of the common stock of the issuer, pro-rata for no consideration as part of an internal reorganization. These securities are owned directly by Boxer Capital, which may be deemed to be a member of a "group" for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, consisting of (i) Boxer Capital, (ii) Braslyn Ltd., (iii) Boxer Asset Management Inc., (iv) MVA Investors, LLC, (iv) Joe Lewis, (v) Rodney W. Lappe, (vi) Ivan M. Lieberburg, (vii) Aaron I. Davis, (viii) Neil Reisman, (ix) Shehan B. Dissanayake, (x) Christopher Fuglesang (xi) Peter E. Harwin, and (xii) William N. Harwin 2012 Gift Trust F/B/O Peter Harwin. Boxer Capital, LLC, By: /s/ Aaron I. Davis 2016-03-17