X0306 4 2020-05-26 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) 72.54 2020-05-26 4 A 0 7700 0.00 A 2030-05-26 Common Stock 7700 7700 D 100% of the shares subject to the option shall vest upon the earlier of (i) the one-year anniversary of the date of grant of the option or (ii) the date of the next annual meeting of stockholders that occurs following the grant of such option, in each case, provided that the Reporting Person continues to serve as a non-employee director through the applicable vesting date. /s/ Sasha Keough, attorney-in-fact 2020-05-28