X0306 4 2018-07-02 0 0001667633 Forty Seven, Inc. FTSV 0001602573 Lightspeed Venture Partners X, L.P. 2200 SAND HILL ROAD MENLO PARK CA 94025 0 0 1 0 0001617751 Lightspeed Affiliates X, L.P. 2200 SAND HILL ROAD MENLO PARK CA 94025 0 0 1 0 0001700550 Lightspeed General Partner X, L.P. 2200 SAND HILL ROAD MENLO PARK CA 94025 0 0 1 0 0001700549 Lightspeed Ultimate General Partner X, 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 67036 A 67036 I See footnote Common Stock 2018-07-02 4 C 0 1340698 A 1340698 I See footnote Common Stock 2018-07-02 4 C 0 1133670 A 2474368 I See footnote Series A-1 Preferred Stock 2018-07-02 4 C 0 67036 D Common Stock 67036 0 I See footnote Series A-1 Preferred Stock 2018-07-02 4 C 0 1340698 D Common Stock 1340698 0 I See footnote Series A-2 Preferred Stock 2018-07-02 4 C 0 1133670 D Common Stock 1133670 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. Shares held by Lighspeed Affiliates X, L.P., or Lightspeed Affiliates. Lightspeed General Partner X, L.P., or Lightspeed GP X, is the general partner of Lightspeed X and Lightspeed Affiliates. Lightspeed Ultimate General Partner X, Ltd., or Lightspeed UGP X, is the general partner of Lightspeed GP X. Christopher J. Schaepe, Barry Eggers, Ravi Mhatre, Peter Nieh and Jeremy Liew are the directors of Lightspeed UGP X and share voting and dispositive power with respect to the shares held by Lightspeed X. Messrs. Schaepe, Eggers, Liew, Mhatre and Nieh disclaim beneficial ownership of the shares held by Lightspeed X and Lightspeed Affiliates except to the extent of their pecuniary interest therein. Shares held by Lightspeed Venture Partners X, L.P., or Lightspeed X. Lightspeed Venture Partners X, L.P., by Lightspeed General Partner X, L.P., its general partner, by Lightspeed Ultimate General Partner X, Ltd., its general partner, by /s/ Christopher J. Schaepe, Duly authorized signatory 2018-07-02 Lightspeed Affiliates X, L.P., by Lightspeed General Partner X, L.P., its general partner, by Lightspeed Ultimate General Partner X, Ltd., its general partner, by /s/ Christopher J. Schaepe, Duly authorized signatory 2018-07-02 Lightspeed General Partner X, L.P., by Lightspeed Ultimate General Partner X, Ltd., its general partner, by /s/ Christopher J. Schaepe, Duly authorized signatory 2018-07-02 Lightspeed Ultimate General Partner X, 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 Mahtre 2018-07-02 /s/ Jeremy Liew 2018-07-02