Sec Form 4 Filing - Vifor (International) Ltd @ ChemoCentryx, Inc. - 2021-10-12

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 Vifor (International) Ltd 2. Issuer Name and Ticker or Trading Symbol ChemoCentryx, Inc. [ CCXI] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) RECHENSTRASSE 37 3. Date of Earliest Transaction (MM/DD/YY) 10/12/2021 (Street) CH-9014 ST. GALLEN, V8 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ 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, par value $0.001 per share 10/12/2021 S 4,000,000 D $ 39.43 5,194,085 I See footnotes ( 1 ) ( 2 ) ( 3 )

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 Vifor (International) Ltd RECHENSTRASSE 37 CH-9014 ST. GALLEN, V8 X Vifor Pharma Ltd. RECHENSTRASSE 37 CH-9014 ST. GALLEN, V8 X Vifor Fresenius Medical Care Renal Pharma Ltd. RECHENSTRASSE 37 CH-9014 ST. GALLEN, V8 X Signatures VIFOR (INTERNATIONAL) LTD, By: /s/ Markus Frenzen, Title: Group Treasurer, /s/ Georg Frey, Title: Head Legal Corporate 10/13/2021 Signature of Reporting Person Date VIFOR PHARMA LTD, By: /s/ Markus Frenzen, Title: Group Treasurer, /s/ Georg Frey, Title: Head Legal Corporate 10/13/2021 Signature of Reporting Person Date VIFOR FRESENIUS MEDICAL CARE RENAL PHARMA LTD, By: /s/ Markus Frenzen, Title: Group Treasurer, /s/ Georg Frey, Title: Head Legal Corporate 10/13/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )In addition to Vifor (International) Ltd., an entity formed under the laws of Switzerland ("Vifor"), and Vifor Fresenius Medical Care Renal Pharma Ltd., an entity formed under the laws of Switzerland ("VFMCRP"), this Form 4 is being filed by Vifor Pharma Ltd., an entity formed under the laws of Switzerland ("Vifor Pharma" and, together with Vifor and VFMCRP, the "Reporting Persons"). The business addresses for each of the Reporting Persons are listed above. Each of the Reporting Persons may be deemed to have a pecuniary interest in securities reported by it on this Form 4 (the "Subject Securities"). ( 2 )Beneficial ownership of the common stock referred to herein is being reported solely because (i) Vifor Pharma may be deemed to beneficially own 1,860,752 shares of Common Stock of ChemoCentryx, Inc. as a result of Vifor Pharma's indirect ownership of 100% of the equity interests of Vifor, and (ii) Vifor Pharma may be deemed to beneficially own 3,333,333 shares of Common Stock of ChemoCentryx, Inc. as a result of Vifor Pharma's indirect ownership of 55% of the equity interests of VFMCRP. ( 3 )Each of the Reporting Persons disclaims any beneficial ownership of any of the Subject Securities, except to the extent of any 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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