X0306 4 2019-02-11 0 0001576263 Mirati Therapeutics, Inc. MRTX 0001468223 MVA Investors, LLC 11682 EL CAMINO REAL, SUITE 320 SAN DIEGO CA 92130 0 0 1 0 Common Stock 2019-02-11 4 J 0 18955 0.00 D 494675 D On February 11, 2019, MVA Investors, LLC ("MVA Investors") distributed 18,955 shares of the common stock of the issuer to one of its members on a pro rata basis for no consideration in connection with such member's withdrawal from MVA Investors. These securities are owned directly by the reporting person, which has sole voting and dispositive power with respect to these securities. The reporting person 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) Braslyn Ltd. ("Braslyn"), (ii) Boxer Capital, LLC ("Boxer Capital"), (iii) Boxer Asset Management Inc. ("Boxer Management"), (iv) the reporting person, (v) Tuesday Thirteen Inc., (vi) Joe Lewis, (vii) Rodney W. Lappe, (viii) Ivan M. Lieberburg, (ix) Aaron I. Davis, (x) Neil Reisman, (xi) Shehan B. Dissanayake, and (xii) Christopher Fuglesang (collectively, the "Boxer Group). Each member of the Boxer Group other than MVA Investors disclaims beneficial ownership of these securities to the extent it or he does not have a pecuniary interest therein. MVA Investors, LLC, By: /s/ Aaron Davis, Aaron Davis 2019-02-13