X0206 3 2020-10-29 0 0001593899 Atea Pharmaceuticals, Inc. AVIR 0001595725 Rock Springs Capital Management LP 650 SOUTH EXETER ST. SUITE 1070 BALTIMORE MD 21202 0 0 1 0 0001735393 Rock Springs Capital Master Fund LP C/O WALKERS CORPORATE LIMITED, CAYMAN CO CENTER, 27 HOSPITAL ROAD GEORAGE TOWN E9 KY-1-9008 CAYMAN ISLANDS 0 0 1 0 0001735397 Rock Springs Capital LLC 650 SOUTH EXETER ST. SUITE 1070 BALTIMORE MD 21202 0 0 1 0 Series D Convertible Preferred Stock Common Stock 890313 I See footnote Series D-1 Convertible Preferred Stock Common Stock 521703 I See footnote Series D Convertible Preferred Stock Common Stock 178063 I See footnote Series D-1 Convertible Preferred Stock Common Stock 104340 I See footnote Each share of preferred stock automatically converts into the number of shares of common stock as shown in Column 3 without payment of further consideration at the holder's election or upon closing of the initial public offering of the Issuer's common stock. The shares have no expiration date. The securities reported herein are held of record by Rock Springs Capital Master Fund LP ("Master Fund"). Rock Springs Capital LLC ("RSC") is the general partner of Rock Springs Capital Management LP ("RSCM") which is the investment manager to Master Fund. RSC and RSCM may therefore be deemed to have or share beneficial ownership of preferred stock held directly by Master Fund. The securities reported herein are held of record by Four Pines Master Fund LP ("Four Pines"). RSC is the general partner of RSCM which is the investment manager to Four Pines. RSC and RSCM may therefore be deemed to have or share beneficial ownership of the preferred stock held directly by Four Pines. Rock Springs Capital Management LP, By: /s/ Kris Jenner, Member 2020-10-29 Rock Springs Capital Master Fund LP, By: /s/ Kris Jenner, Member 2020-10-29 Rock Springs Capital LLC, By: /s/ Kris Jenner, Member 2020-10-29