X0206 3 2020-07-23 0 0001808865 iTeos Therapeutics, Inc. ITOS 0001465837 Boxer Capital, LLC 11682 EL CAMINO REAL, SUITE 320 SAN DIEGO CA 92130 0 0 1 0 0001465836 Boxer Asset Management Inc. 11682 EL CAMINO REAL, SUITE 320 SAN DIEGO CA 92130 0 0 1 0 0001015747 LEWIS JOSEPH 11682 EL CAMINO REAL, SUITE 320 SAN DIEGO CA 92130 0 0 1 0 0001468223 MVA Investors, LLC 11682 EL CAMINO REAL, SUITE 320 SAN DIEGO CA 92130 0 0 1 0 Series B-2 Preferred Stock Common Stock 2943568 D Series B-2 Preferred Stock Common Stock 48691 D Each share of Series B-2 Convertible Preferred stock is convertible at any time, at the Reporting Person's election, into Common Stock, based on the then-applicable conversion rate and has no expiration date. The shares of Series B-2 Convertible Preferred stock held by Boxer Capital, LLC ("Boxer Capital") will convert automatically into 2,943,568 shares of Common Stock upon the closing of the Issuer's initial public offering. The shares of Series B-2 Convertible Preferred stock held by MVA Investors, LLC ("MVA Investors") will convert automatically into 48,691 shares of Common Stock upon the closing of the Issuer's initial public offering. These amounts reflect a 1-for-3.3115 reverse stock split which became effective on July 20, 2020. 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) Boxer Asset Management Inc., (iii) MVA Investors, (iv) Aaron I. Davis, and (v) Joe Lewis (collectively, the "Boxer Group"). Each member of the Boxer Group other than Boxer Capital disclaims beneficial ownership of these securities to the extent it does not have a pecuniary interest therein. These securities are owned directly by MVA Investors. 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. Boxer Capital, LLC, By: /s/ Aaron I. Davis, Chief Executive Officer 2020-07-23 Boxer Asset Management, Inc., By: /s/ Jason C. Callender, Director 2020-07-23 /s/ Joseph C. Lewis 2020-07-23 MVA Investors, LLC, By: /s/ Aaron I. Davis, Chief Executive Officer 2020-07-23