Sec Form 4 Filing - JANNEY DANIEL @ Allakos Inc. - 2021-03-26

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person JANNEY DANIEL 2. Issuer Name and Ticker or Trading Symbol Allakos Inc. [ ALLK] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) FOUR EMBARCADERO CENTER, SUITE 2100 3. Date of Earliest Transaction (MM/DD/YY) 03/26/2021 (Street) SAN FRANCISCO, CA94111 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 8,519,200 I See Footnote ( 1 ) ( 2 ) ( 3 ) Common Stock 03/26/2021 S 14,808 D $ 115.01 ( 4 ) 58,793 I By Alta Bioequities L.P. ( 5 ) Common Stock 03/26/2021 S 2,500 D $ 116.09 56,293 I By Alta Bioequities L.P. ( 5 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other JANNEY DANIEL FOUR EMBARCADERO CENTER SUITE 2100 SAN FRANCISCO, CA94111 X X Signatures /s/ Daniel Janney 03/30/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Consists of 2,071,147 shares held of record by Alta Partners NextGen Fund I, L.P. ("APNG I") and 6,448,053 shares held of record by Alta Partners VIII, L.P. ("Alta VIII"). ( 2 )The shares directly held by Alta VIII are indirectly held by Alta Partners Management VIII, LLC ("Alta Management VIII"), which is the general partner of Alta VIII. The Reporting Person is a managing director of Alta Management VIII and, as such, may be deemed to share voting and investment control with respect to the shares held by Alta VIII. The Reporting Person disclaims beneficial ownership of all shares held by Alta VIII, except to the extent of his pecuniary interest therein. ( 3 )The shares directly held by APNG I are indirectly held by Alta Partners NextGen Fund I Management, LLC ("APNG I Management"), which is the general partner of APNG I. The Reporting Person is one of three managing directors of APNG I Management and, as such, has voting and investment control with respect to the shares held by APNG I. The Reporting Person disclaims beneficial ownership of all shares held by APNG I, except to the extent of his pecuniary interest therein. ( 4 )The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $115.00 - $115.14, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote to this Form 4. ( 5 )Alta Bioequities Management, LLC is the general partner of Alta Bioequities, L.P. and may be deemed to have sole voting and investment power over the shares beneficially owned by Alta Bioequities, L.P. Daniel Janney is the Managing Director of Alta Bioequities Management, LLC. The Reporting Person disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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