X0609 4 2026-04-28 0001850270 PROKIDNEY CORP. PROK 0001273693 Control Empresarial de Capitales S.A. de C.V. true PASEO DE LAS PALMAS 781, PISO 6 LOMAS DE CHAPULTEPEC CIUDAD DE MEXICO O5 11000 MEXICO true true Add'l Rep. Persons-see Ex.99-1 false Class A Common Shares (as defined in Exhibit 99.1 hereto) 2026-04-28 4 C 0 63118645 0 A 73842723 D Class B Common Shares 2026-04-28 4 C 0 63118645 0 D Class A Common Shares 63118645 0 D Common Units in ProKidney LLC 2026-04-28 4 C 0 63118645 0 D Class A Common Shares 63118645 0 D 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. 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. 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. 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. 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. See attached Exhibit 99.1 to this Form 4, which is hereby incorporated herein by reference. /s/ Victor Manuel Gutierrez Lopez, Attorney-in-Fact 2026-04-30