Sec Form 4 Filing - Control Empresarial de Capitales S.A. de C.V. @ PROKIDNEY CORP. - 2026-04-28

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 Control Empresarial de Capitales S.A. de C.V. 2. Issuer Name and Ticker or Trading Symbol PROKIDNEY CORP. [ PROK] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) X __ Other (specify below) Add'l Rep. Persons-see Ex.99-1 (Last) (First) (Middle) PASEO DE LAS PALMAS 781, PISO 6, LOMAS DE CHAPULTEPEC 3. Date of Earliest Transaction (MM/DD/YY) 04/28/2026 (Street) CIUDAD DE MEXICO11000 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 Class A Common Shares (as defined in Exhibit 99.1 hereto) 04/28/2026 C( 1 ) 63,118,645 A $ 0 73,842,723 ( 2 ) D ( 6 )

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 Class B Common Shares ( 3 ) 04/28/2026 C( 1 ) 63,118,645 ( 4 ) ( 4 ) Class A Common Shares 63,118,645 $ 0 0 D ( 6 ) Common Units in ProKidney LLC ( 3 ) 04/28/2026 C( 1 ) 63,118,645 ( 5 ) ( 5 ) Class A Common Shares 63,118,645 $ 0 0 D ( 6 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Control Empresarial de Capitales S.A. de C.V. PASEO DE LAS PALMAS 781, PISO 6 LOMAS DE CHAPULTEPEC CIUDAD DE MEXICO11000 X Add'l Rep. Persons-see Ex.99-1 Signatures /s/ Victor Manuel Gutierrez Lopez, Attorney-in-Fact 04/30/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Prior to April 28, 2026 (the "Transaction Date"), the reporting persons beneficially owned 63,118,645 Class B Common Shares, $0.0001 par value per share (the "Class B Common Shares") of ProKidney Corp. (the "Issuer"), each of which may, subject to the limitations set forth in the Amended and Restated Exchange Agreement (the "Exchange Agreement") and the Second Amended and Restated Limited Liability Company Agreement of ProKidney Holdings, be exchanged, together with the paired common unit (a "Common Unit," and together with the Class B Common Shares, the "Paired Interests") in ProKidney Holdings, LLC ( "ProKidney LLC"), for a Class A Common Share on a one-for-one basis. Prior to the Transaction Date, the reporting person owned 63,118,645 Paired Interests. On the Transaction Date, the reporting person exchanged 63,118,645 Paired Interests for 63,118,645 Class A Common Shares. ( 2 )The Form 4 filed by the reporting person on March 16, 2024 and prior to the date hereof inadvertently aggregated 63,118,645 Paired Interests in Table I. ( 3 )At the election of the reporting person and subject to the limitations set forth in the Exchange Agreement, each Class B Common Share, together with a paired Common Unit, may be exchanged for a Class A Common Share on a one-for-one basis. ( 4 )The Class B Common Shares were received pursuant to the terms of the Business Combination Agreement by and between the Issuer (formerly known as Social Capital Suvretta Holdings Corp. III) and ProKidney LP, dated as of January 18, 2022 (the "Business Combination Agreement"), in exchange for historical interests held by the reporting person in ProKidney LP. The Class B Common Shares do not expire. ( 5 )The Common Units were received pursuant to the terms of the Business Combination Agreement in exchange for historical interests held by the reporting person in ProKidney LP. The Common Units do not expire. ( 6 )See attached Exhibit 99.1 to this Form 4, which is hereby incorporated herein by reference.

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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