X0306 4 2022-05-25 0 0001564824 Allakos Inc. ALLK 0001553150 Walker Paul Edward 1954 GREENSPRING DRIVE SUITE 600 TIMONIUM MD 21093 1 0 0 0 Stock Option (Right to Buy) 2.62 2022-05-25 4 A 0 99590 0.00 A 2032-05-25 Common Stock 99590 99590 D The options vest as to 100% of the shares on the earlier of (i) the one-year anniversary of the date of the grant or (ii) the date of the Issuer's next Annual Meeting of stockholders that occurs following the grant, subject to the Reporting Person continuing as a service provider through each such date. /s/ Louis Citron, attorney-in-fact 2022-05-27