X0306 4 2020-07-14 0 0001661460 Poseida Therapeutics, Inc. PSTX 0001619884 Hirsch David C/O POSEIDA THERAPEUTICS, INC. 9390 TOWNE CENTRE DRIVE, SUITE 200 SAN DIEGO CA 92121 1 0 0 0 Common Stock 2020-07-14 4 C 0 2464245 A 2464245 I See footnote Common Stock 2020-07-14 4 P 0 250000 16.00 A 2714245 I See footnote Series B Preferred Stock 2020-07-14 4 C 0 2581755 D Common Stock 2070373 0 I See footnote Series C Preferred Stock 2020-07-14 4 C 0 491159 D Common Stock 393872 0 I See footnote Each share of the Issuer's Series B Preferred Stock and Series C Preferred Stock (collectively, the "Preferred Stock") automatically converted into 0.8019246 shares of the Issuer's common stock upon the closing of the Issuer's initial public offering. The Preferred Stock had no expiration date. Represents shares held by Longitude Venture Partners III, L.P. ("LVP III"). Longitude Capital Partners III, LLC ("LCP III") is the general partner of LVP III and may be deemed to have voting, investment and dispositive power over securities held by LVP III. The reporting person is a member of LCP III and may be deemed to share voting, investment and dispositive power with respect to securities held by LVP III. The reporting person disclaims beneficial ownership of these securities, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interests therein. /s/ Johanna M. Mylet, Attorney-in-Fact 2020-07-15