X0306 4 2018-07-02 0 0001667633 Forty Seven, Inc. FTSV 0001668017 Lightspeed Venture Partners Select II, L.P. 2200 SAND HILL ROAD MENLO PARK CA 94025 0 0 1 0 0001744936 Lightspeed General Partner Select II, L.P. 2200 SAND HILL ROAD MENLO PARK CA 94025 0 0 1 0 0001744937 Lightspeed Ultimate General Partner Select II, Ltd. 2200 SAND HILL ROAD MENLO PARK CA 94025 0 0 1 0 0001185068 SCHAEPE CHRISTOPHER J 2200 SAND HILL ROAD MENLO PARK CA 94025 1 0 1 0 0001366048 Eggers Barry 2200 SAND HILL ROAD MENLO PARK CA 94025 0 0 1 0 0001366051 Nieh Peter 2200 SAND HILL ROAD MENLO PARK CA 94025 0 0 1 0 0001366050 Mhatre Ravi 2200 SAND HILL ROAD MENLO PARK CA 94025 0 0 1 0 0001700539 Liew Jeremy 2200 SAND HILL ROAD MENLO PARK CA 94025 0 0 1 0 Common Stock 2018-07-02 4 C 0 1315519 A 1315519 I See footnote Common Stock 2018-07-02 4 P 0 468750 16.00 A 1784269 I See footnote Series B Preferred Stock 2018-07-02 4 C 0 1315519 D Common Stock 1315519 0 I See footnote The Issuer's preferred stock automatically converted into an equal number of shares of Issuer's common stock immediately upon the closing of the Issuer's initial public offering and has no expiration date. Lightspeed General Partner Select II, L.P., or Select II GP, is the general partner of Lightspeed Venture Partners Select II, L.P., or Lightspeed Select II. Lightspeed Ultimate General Partner Select II, Ltd., or Select II UGP, is the general partner of Select II GP. Christopher J. Schaepe, Barry Eggers, Jeremy Liew, Ravi Mhatre and Peter Nieh are the directors of Select II UGP and share voting and dispositive power with respect to the shares held by Lightspeed Select II. Messrs. Schaepe, Eggers, Liew, Mhatre and Nieh disclaim beneficial ownership of the shares held by Lightspeed Select II except to the extent of their pecuniary interest therein. Lightspeed Venture Partners Select II, L.P., by Lightspeed General Partner Select II, L.P., its general partner, by Lightspeed Ultimate General Partner Select II, Ltd., its general partner, /s/ Christopher J. Schaepe, Duly authorized signatory 2018-07-02 Lightspeed General Partner Select II, L.P., by Lightspeed Ultimate General Partner Select II, Ltd., its general partner, by /s/ Christopher J. Schaepe, Duly authorized signatory 2018-07-02 Lightspeed Ultimate General Partner Select II, Ltd., by /s/ Christopher J. Schaepe, Duly authorized signatory 2018-07-02 /s/ Christopher J. Schaepe 2018-07-02 /s/ Barry Eggers 2018-07-02 /s/ Peter Nieh 2018-07-02 /s/ Ravi Mhatre 2018-07-02 /s/ Jeremy Liew 2018-07-02