X0306 4 2021-07-20 0 0001761918 Erasca, Inc. ERAS 0001283290 Lim Jonathan E C/O ERASCA, INC. 10835 ROAD TO THE CURE, SUITE 140 SAN DIEGO CA 92121 1 1 1 0 See Remarks 0001872346 Lim Conyee T. C/O ERASCA, INC. 10835 ROAD TO THE CURE, SUITE 140 SAN DIEGO CA 92121 0 0 1 0 0001872305 City Hill, LLC 4653 CARMEL MOUNTAIN ROAD, SUITE 308-501 SAN DIEGO CA 92121 0 0 1 0 Common Stock 2021-07-20 4 C 0 5135390 A 20156222 I By Jonathan E. Lim and Conyee T. Lim Family Trust, dated April 28, 2005 Common Stock 2021-07-20 4 C 0 5441027 A 11899360 I By City Hill, LLC Series A Preferred Stock 0.00 2021-07-20 4 C 0 6162468 D Common Stock 5135390 0 I By the Jonathan E. Lim and Conyee T. Lim Family Trust, dated April 28, 2005 Series A Preferred Stock 0.00 2021-07-20 4 C 0 6081233 D Common Stock 5067694 0 I By City Hill, LLC Series B-1 Preferred Stock 0.00 2021-07-20 4 C 0 336000 D Common Stock 280000 0 I By City Hill, LLC Series B-2 Preferred Stock 0.00 2021-07-20 4 C 0 112000 D Common Stock 93333 0 I By City Hill, LLC The shares of the Issuer's Series A and Series B Preferred Stock automatically converted into shares of the Issuer's Common Stock, for no additional consideration, at a ratio of 1.2-for-1 share, immediately prior to the consummation of the Issuer's initial public offering. The securities reported herein may be deemed beneficially owned by each of (i) Jonathan E. Lim, M.D. and (ii) Conyee T. Lim, M.D., who are co-trustees of the Jonathan E. Lim and Conyee T. Lim Family Trust, dated April 28, 2005. Consists of shares held directly by City Hill, LLC ("City Hill"). Jonathan E. Lim, M.D. serves as the managing partner of City Hill. Dr. Lim exercises voting and dispositive control over the securities held by City Hill and is therefore deemed to be a beneficial owner of securities owned by City Hill. Dr. Lim disclaims beneficial ownership of the reported securities held by City Hill, except to the extent of his pecuniary interest therein. Chairman and Chief Executive Officer /s/ Ebun S. Garner, Attorney-in-Fact 2021-07-20