X0306 4 2021-03-05 0 0001576263 Mirati Therapeutics, Inc. MRTX 0001465837 Boxer Capital, LLC 12860 EL CAMINO REAL, SUITE 300 SAN DIEGO CA 92130 0 0 1 0 0001465836 Boxer Asset Management Inc. CAY HOUSE, EP TAYLOR DRIVE LYFORD CAY NEW PROVIDENCE C5 N7776 BAHAMAS 0 0 1 0 0001015747 LEWIS JOSEPH CAY HOUSE, EP TAYLOR DRIVE LYFORD CAY NEW PROVIDENCE C5 N7776 BAHAMAS 0 0 1 0 0001468223 MVA Investors, LLC 11682 EL CAMINO REAL, SUITE 300 SAN DIEGO CA 92130 0 0 1 0 0001465914 Davis Aaron I. 12860 EL CAMINO REAL, SUITE 300 SAN DIEGO CA 92130 0 0 1 0 0001266427 LIEBERBURG IVAN M 12860 EL CAMINO REAL, SUITE 300 SAN DIEGO CA 92130 0 0 1 0 0001663609 Dissanayake Shehan Bharatha 12860 EL CAMINO REAL, SUITE 300 SAN DIEGO CA 92130 0 0 1 0 0001465835 Fuglesang Christopher 12860 EL CAMINO REAL, SUITE 300 SAN DIEGO CA 92130 0 0 1 0 Common Stock 2021-03-05 4 M 0 13996 0.001 A 267334 D Common Stock 2021-03-05 4 S 0 1 181.00 D 267333 D Common Stock 2021-03-05 4 S 0 37000 181.15 D 230333 D Common Stock 2021-03-05 4 M 0 597444 0.001 A 2363004 D Common Stock 2021-03-05 4 S 0 4 181.00 D 2363000 D Common Stock 2021-03-05 4 S 0 363000 181.15 D 2000000 D Warrant (right to purchase) 0.001 2021-03-05 4 M 0 13996 5.599 D 2017-01-06 Common Stock 13996 0 D Warrant (right to purchase) 0.001 2021-03-05 4 M 0 128805 5.599 D 2017-01-06 Common Stock 128805 0 D Warrant (right to purchase) 0.001 2021-03-05 4 M 0 468639 12.999 D 2017-11-20 Common Stock 468639 332809 D These securities are owned directly by MVA Investors which may be deemed to be a member of the Boxer Group for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended. Aaron I. Davis is a member of and has voting and dispositive power over securities held by MVA Investors Each member of the Boxer Group other than MVA Investors and Aaron I. Davis disclaims beneficial ownership of these securities to the extent it or he does not have a pecuniary interest therein. These securities are owned directly by Boxer Capital, LLC ("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) Braslyn Ltd. ("Braslyn"), (ii) Boxer Capital, LLC ("Boxer Capital") (iii) Boxer Asset Management Inc. ("Boxer Management"), (iv) MVA Investors, LLC ("MVA Investors"), (v) Lockend Five, LLC ("Lockend Five"), (vi) Joe Lewis, (vii) Ivan M. Lieberburg, (viii) Aaron I. Davis, (ix) Shehan B. Dissanayake, and (x) Christopher Fuglesang (collectively, the "Boxer Group), and indirectly by Braslyn, Boxer Management and Messrs. Lewis, Fuglesang, Lieberburg, Dissanayake and Davis, by virtue of their ownership in Boxer Capital. (Continued from Footnote 2) Each of Messrs. Fuglesang, Lieberburg, Dissanayake and Davis is a member of Boxer Capital. Each member of the Boxer Group other than Boxer Capital disclaims beneficial ownership of these securities to the extent it or he does not have a pecuniary interest therein. The warrants do not have an expiration date and are not exercisable to the extent that, following exercise of such warrants, the warrant holder and its affiliates would beneficially own more than 19.99% of the issuer's common stock. Boxer Capital, LLC, By: /s/ Aaron I. Davis 2021-03-09 MVA Investors, LLC, By: /s/ Aaron I. Davis 2021-03-09 Boxer Asset Management, Inc., By: /s/ Jason Callender 2021-03-09 /s/ Joseph C. Lewis 2021-03-09 Ivan M. Lieberburg, /s/ Christopher Fuglesang 2021-03-09 /s/ Aaron I. Davis 2021-03-09 /s/ Shehan B. Dissanayake 2021-03-09 /s/ Christopher Fuglesang 2021-03-09