X0306 4 2016-01-15 0 0001576263 Mirati Therapeutics, Inc. MRTX 0001642355 Braslyn Ltd. 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 2016-01-15 4 J 0 626189 0.00 A 1148689 D On January 15, 2016, Boxer Asset Management Inc. ("Boxer Management") transferred 626,189 shares of the common stock of the issuer to Braslyn Ltd. ("Braslyn") for no consideration as part of an internal reorganization. These securities are owned directly by Braslyn, 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, LLC, (ii) Boxer Management, (iii) MVA Investors, LLC, (iv) the reporting person, (v) Joe Lewis, (vi) Christopher Fuglesang, (vii) Rodney W. Lappe, (viii) Ivan M. Lieberburg, (ix) Neil Reisman, (x) Shehan B. Dissanayake, (xi) Peter E. Harwin, and (xii) William N. Harwin 2012 Gift Trust F/B/O Peter Harwin. Joe Lewis is the sole indirect owner of and controls Braslyn. Braslyn Ltd., By: /s/ Jefferson Voss 2016-01-15