X0306 4 2022-03-02 0 0001564824 Allakos Inc. ALLK 0001637219 Tomasi Adam 975 ISLAND DRIVE, SUITE 201 REDWOOD CITY CA 94065 0 1 0 0 President and COO Common Stock 2022-03-02 4 F 0 5582 5.38 D 569108 D Common Stock 3953 I See footnote Shares withheld to satisfy the tax obligations by the Reporting Person in connection with the vesting of RSUs. Includes 3,953 shares received as a pro-rata in-kind distribution of Common Stock of the Issuer by Alta Partners Management VIII, LLC (APM VIII), without consideration, to the reporting person as a non-managing member of APM VIII. The shares are held by Mr. Tomasi and Carrie Tomasi, as Trustees of the Tomasi Living Trust dated July 14, 2017. /s/ Adam Tomasi 2022-03-03