Document:

EX-10.3

 Exhibit 10.3 

EXECUTION VERSION 

SPONSOR SUPPORT AGREEMENT 

This Sponsor Support Agreement (this “Sponsor Agreement”) is dated as of January 18, 2022, by and among SCS
Sponsor III LLC, a Cayman Islands limited liability company (the “Sponsor Holdco”), the Persons set forth on Schedule I hereto (together with the Sponsor Holdco, each, a “Sponsor” and, together, the
“Sponsors”), Social Capital Suvretta Holdings Corp. III, a Cayman Islands exempted company limited by shares (“Acquiror”), and ProKidney LP, a limited partnership organized pursuant to the laws of Ireland (the
“Company”). Except as otherwise specified, capitalized terms used but not defined herein shall have the respective meanings ascribed to such terms in the Business Combination Agreement (as defined below). 

RECITALS 
 WHEREAS, as of
the date hereof, the Sponsors collectively are the holders of record and the “beneficial owners” (within the meaning of Rule 13d-3 under the Exchange Act) of 6,920,000 Acquiror Common Shares in the
aggregate as set forth on Schedule I attached hereto; 
 WHEREAS, contemporaneously with the execution and delivery of this Sponsor
Agreement, Acquiror and the Company have entered into a Business Combination Agreement (as amended or modified from time to time, the “Business Combination Agreement”), dated as of the date hereof, pursuant to which, among other
things, (a) the Company shall issue New Company Common Units to Acquiror in exchange for a combination of shares of Acquiror Class B Common Stock and cash, (b) New GP shall be admitted as the general partner of the Company and
(c) the Company shall distribute the shares of Acquiror Class B Common Stock acquired from Acquiror to the Existing Company Unitholders in accordance with the Amended and Restated Company Limited Partnership Agreement (collectively, the
“Business Combination”); and 
 WHEREAS, as an inducement to Acquiror and the Company to enter into the Business
Combination Agreement and to consummate the transactions contemplated therein, the parties hereto desire to agree to certain matters as set forth herein. 

AGREEMENT 
 NOW,
THEREFORE, in consideration of the foregoing and the mutual agreements contained herein, and intending to be legally bound hereby, the parties hereto hereby agree as follows: 

ARTICLE I 
 SPONSOR
SUPPORT AGREEMENT; COVENANTS 
 Section 1.1 Binding Effect of Business Combination Agreement. Each Sponsor hereby
acknowledges that it has read the Business Combination Agreement and this Sponsor Agreement and has had the opportunity to consult with its tax and legal advisors. Each Sponsor hereby agrees that (i) such Sponsor shall be bound by and comply
with Sections 6.4 (No Solicitation by Acquiror), 7.1 (Antitrust Approvals; Other Filings) and 10.12 (Publicity) of the Business Combination Agreement (and any relevant defined terms contained in any such Sections) as if such
Sponsor was an original signatory to the Business Combination Agreement with respect 

 
to such provisions and (ii) such Sponsor shall provide to the Acquiror, the Company and their respective Representatives any information regarding such Sponsor or the Acquiror Common Shares
that is reasonably requested by the Acquiror, the Company or their respective Representatives and is required in order for the Company and the Acquiror to comply with Sections 6.8, 7.1, 7.2, 7.3 and 7.5 of the Business Combination Agreement. 

Section 1.2 No Transfer. During the period commencing on the date hereof and ending at the Expiration Time, each Sponsor shall not
(i) sell, offer to sell, contract or agree to sell, hypothecate, pledge, grant any option to purchase or otherwise dispose of or agree to dispose of, directly or indirectly, file (or participate in the filing of) a registration statement with
the SEC or establish or increase a put equivalent position or liquidate or decrease a call equivalent position within the meaning of Section 16 of the Exchange Act, with respect to any Acquiror Common Shares owned by such Sponsor,
(ii) enter into any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of any shares of Acquiror Common Shares owned by such Sponsor (clauses (i) and (ii) collectively, a
“Transfer”) or (iii) publicly announce any intention to effect any transaction specified in clause (i) or (ii); provided, however, that the foregoing shall not prohibit Transfers between such Sponsor and any
Affiliate of such Sponsor, so long as, prior to and as a condition to the effectiveness of any such Transfer, such Affiliate executes and delivers to Acquiror a joinder to this Sponsor Agreement in the form attached hereto as Annex A. 

Section 1.3 New Shares. In the event that (a) any Acquiror Common Shares or other equity securities of Acquiror are issued to
a Sponsor after the date of this Sponsor Agreement pursuant to any stock dividend, stock split, recapitalization, reclassification, combination or exchange of Acquiror Common Shares of, on or affecting the Acquiror Common Shares owned by such
Sponsor or otherwise, (b) a Sponsor purchases or otherwise acquires beneficial ownership of any Acquiror Common Shares or other equity securities of Acquiror after the date of this Sponsor Agreement, or (c) a Sponsor acquires the right to
vote or share in the voting of any Acquiror Common Shares or other equity securities of Acquiror after the date of this Sponsor Agreement (such Acquiror Common Shares or other equity securities of Acquiror, collectively the “New
Securities”), then such New Securities acquired or purchased by such Sponsor shall be subject to the terms of this Sponsor Agreement to the same extent as if they constituted the Acquiror Common Shares owned by such Sponsor as of the date
hereof. 
 Section 1.4 Closing Date Deliverables. On the Closing Date, each of the Sponsor Holdco, the Director Holders and the
Advisor Holders (as such terms are defined therein) shall deliver to Acquiror and the Company a duly executed copy of that certain Registration Rights Agreement, by and among Acquiror, the Company, the Sponsor Holdco, the Director Holders, the
Advisor Holders and certain of the Company’s equityholders or their respective affiliates, as applicable, and the other Holders (as defined therein) party thereto, in substantially the form attached as Exhibit H to the Business Combination
Agreement. 

  
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 Section 1.5 Sponsor Support Agreements. 

(a) At any meeting of the shareholders of Acquiror, however called, or at any adjournment thereof, or in any other circumstance in which the
vote, consent or other approval of the shareholders of Acquiror is sought, each Sponsor shall (i) appear at each such meeting or otherwise cause all of its Acquiror Common Shares to be counted as present thereat (to the extent entitled to vote
thereto) for purposes of calculating a quorum and (ii) vote (or cause to be voted), or execute and deliver a written consent (or cause a written consent to be executed and delivered) covering, all of its Acquiror Common Shares (to the extent
entitled to vote thereto): 
 (i) in favor of each Transaction Proposal; 

(ii) against any Business Combination Proposal or any proposal relating to a Business Combination Proposal (in each case,
other than the Transaction Proposals); 
 (iii) against any merger agreement, merger, consolidation, combination, sale of
substantial assets, reorganization, recapitalization, dissolution, liquidation or winding up of or by Acquiror (other than the Business Combination Agreement, any Ancillary Agreement and the transactions contemplated thereby); 

(iv) against any change in the business, management or Board of Directors of Acquiror (other than in connection with the
Transaction Proposals or to add or replace a member of the Board of Directors of Acquiror in compliance with Nasdaq independence rules); and 

(v) against any proposal, action or agreement that would (A) impede, frustrate, prevent or nullify any provision of this
Sponsor Agreement, the Business Combination Agreement or any Ancillary Agreement or the Business Combination, (B) result in a breach in any respect of any covenant, representation, warranty or any other obligation or agreement of Acquiror under
the Business Combination Agreement or any Ancillary Agreement, (C) result in any of the conditions set forth in Article VIII of the Business Combination Agreement not being fulfilled or (D) change in any manner the dividend policy or
capitalization of, including the voting rights of any class of capital stock of, Acquiror (other than a customary equity grant to (i) any member of the Board of Directors of Acquiror that is added in compliance with Nasdaq independence rules or
(ii) any member of the scientific advisory board of Acquiror that is added consistent with Acquiror’s prior practice in onboarding such members). 

(b) Each Sponsor hereby agrees that it shall not commit or agree to take any action inconsistent with the foregoing. Without limiting the
generality of the foregoing, except as contemplated by the Business Combination Agreement, any Ancillary Agreement or the Transactions, each Sponsor hereby agrees from and after the date hereof: 

(i) not to deposit any of its Acquiror Common Shares in a voting trust or subject any of its Acquiror Common Shares to any
arrangement or agreement with respect to the voting of such Acquiror Common Shares unless specifically requested to do so by the Company and Acquiror in writing in connection with the Business Combination Agreement, the Ancillary Agreements or the
Transactions. 

  
 3 

 (ii) not to make, or in any manner participate in, directly or indirectly,
a “solicitation” of “proxies” or consents (as such terms are used in the rules of the SEC) of any equity interests of Acquiror in connection with any vote of the shareholders of Acquiror with respect to the Transactions, other
than to recommend that the shareholders of the Acquiror vote in favor of the Transaction Proposals (and any actions required in furtherance thereof or otherwise as expressly provided in this Section 1.5); and 

(iii) not to commence or participate in any claim, derivative or otherwise, against the Company, the Acquiror or any of their
respective Affiliates (A) challenging the validity of, or seeking to enjoin the operation of, any provision of this Sponsor Agreement or (B) alleging a breach of any fiduciary duty of the Acquiror Board in connection with this Sponsor
Agreement, the Transaction Proposals, the Business Combination Agreement or the Transactions. 
 (c) Each Sponsor shall comply with, and
fully perform all of its obligations, covenants and agreements set forth in, those certain Letter Agreements, dated as of June 29, 2021 and September 24, 2021, by and among the Sponsors, as applicable, and Acquiror (the “Voting
Letter Agreements”), including without limitation the obligations of the Sponsors pursuant to Section 1 therein to not redeem any Acquiror Common Shares owned by such Sponsor in connection with the transactions contemplated by the
Business Combination Agreement. 
 (d) During the period commencing on the date hereof and ending on the earlier of the consummation of the
Closing and the termination of the Business Combination Agreement pursuant to Article IX thereof, each Sponsor shall not modify or amend any Contract between or among such Sponsor, anyone related by blood, marriage or adoption to such Sponsor or any
Affiliate of such Sponsor (other than Acquiror or any of its Subsidiaries), on the one hand, and Acquiror or any of Acquiror’s Subsidiaries, on the other hand, including, for the avoidance of doubt, the Voting Letter Agreements. 

Section 1.6 Additional Agreements. 

(a) Notwithstanding anything to the contrary in any other agreement or contract to which a Sponsor is bound, each Sponsor (for itself,
himself or herself and for its, his or her successors, heirs and assigns) hereby (but subject to the consummation of the Business Combination) irrevocably and unconditionally waives, to the fullest extent permitted by applicable Laws and
Acquiror’s Amended and Restated Memorandum and Articles of Association, and agrees not to exercise, assert or perfect, any rights to adjustment or other anti-dilution protections with respect to the rate at which shares of Acquiror Class B
Common Stock held by such Sponsor convert into shares of Acquiror Class A Common Stock in connection with the transactions contemplated by the Business Combination Agreement. 

(b) Acquiror and each Sponsor hereby irrevocably and unconditionally agree that, if any amounts are outstanding under any Working Capital
Loan extended to Acquiror or any Subsidiary of Acquiror by any Sponsor as of the Closing, then, notwithstanding the terms of any promissory note or other document evidencing such Working Capital Loan or any other agreement or contract to which
Acquiror or a Sponsor is bound, Acquiror shall repay such outstanding amounts to such Sponsor at the Closing solely in cash, and such Sponsor shall not require, and hereby waives any right to require, any portion of such repayment to occur in the
form of Acquiror Common Shares or any other form. 

  
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 Section 1.7 Further Assurances. Each Sponsor shall take, or cause to be taken,
all actions and do, or cause to be done, all things reasonably necessary under applicable Laws to consummate the Business Combination and the other transactions contemplated by the Business Combination Agreement on the terms and subject to the
conditions set forth therein and herein. 
 Section 1.8 No Inconsistent Agreement. Each Sponsor hereby represents and covenants
that such Sponsor has not entered into, and shall not enter into, any agreement that would restrict, limit or interfere with the performance of such Sponsor’s obligations hereunder. 

ARTICLE II 

REPRESENTATIONS AND WARRANTIES 

Section 2.1 Representations and Warranties of the Sponsors. Each Sponsor represents and warrants as of the date hereof and as of
the Closing to Acquiror and the Company (solely with respect to itself, himself or herself and not with respect to any other Sponsor) as follows: 

(a) Organization; Due Authorization. If such Sponsor is not an individual, it is duly organized, validly existing and in good standing
under the Laws of the jurisdiction in which it is incorporated, formed, organized or constituted, and the execution, delivery and performance of this Sponsor Agreement and the consummation of the transactions contemplated hereby are within such
Sponsor’s corporate, limited liability company or organizational powers and have been duly authorized by all necessary corporate, limited liability company or organizational actions on the part of such Sponsor. If such Sponsor is an individual,
such Sponsor has full legal capacity, right and authority to execute and deliver this Sponsor Agreement and to perform his or her obligations hereunder. This Sponsor Agreement has been duly executed and delivered by such Sponsor and, assuming due
authorization, execution and delivery by the other parties to this Sponsor Agreement, this Sponsor Agreement constitutes a legally valid and binding obligation of such Sponsor, enforceable against such Sponsor in accordance with the terms hereof
(except as enforceability may be limited by bankruptcy Laws, other similar Laws affecting creditors’ rights and general principles of equity affecting the availability of specific performance and other equitable remedies). If this Sponsor
Agreement is being executed in a representative or fiduciary capacity, the Person signing this Sponsor Agreement has full power and authority to enter into this Sponsor Agreement on behalf of the applicable Sponsor. 

(b) Ownership. Such Sponsor is the record and beneficial owner (as defined in the Securities Act) of, and has good title to, all of
such Sponsor’s Acquiror Common Shares, and there exist no Liens (including any restriction on the right to vote, sell or otherwise dispose of such Acquiror Common Shares) affecting any such Acquiror Common Shares, other than Liens indicated on
Schedule I attached hereto or pursuant to (i) this Sponsor Agreement, (ii) Acquiror’s Governing Documents, (iii) the Business Combination Agreement (including the Acquiror Disclosure Letter), (iv) the Voting Letter
Agreements, (v) that certain Amended and 

  
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Restated Securities Subscription Agreement by and between the Sponsor Holdco and the Acquiror, dated as of May 24, 2021, or (vi) any applicable securities Laws. Such Sponsor’s
Acquiror Common Shares are the only equity securities in Acquiror owned of record or beneficially by such Sponsor as of the date of this Sponsor Agreement, and none of such Sponsor’s Acquiror Common Shares are subject to any proxy, voting trust
or other agreement or arrangement with respect to the voting of such Acquiror Common Shares, except as provided hereunder and under the Voting Letter Agreements. Other than the Acquiror Common Shares listed on Schedule I attached hereto, such
Sponsor does not hold or own any rights to acquire (directly or indirectly) any equity securities of Acquiror or any equity securities convertible into, or which can be exchanged for, equity securities of Acquiror. 

(c) No Conflicts. The execution and delivery of this Sponsor Agreement by such Sponsor does not, and the performance by such Sponsor
of his, her or its obligations hereunder will not, (i) result in a violation of applicable Law, except for such violations which would not reasonably be expected, individually or in the aggregate, to have a material effect upon such
Sponsor’s ability to perform its obligations under this Sponsor Agreement, the Business Combination Agreement or any Ancillary Agreement, (ii) if such Sponsor is not an individual, conflict with or result in a violation of the
organizational documents of such Sponsor, (iii) require any consent or approval that has not been given or other action that has not been taken by any Person (including under any Contract binding upon such Sponsor or such Sponsor’s
Acquiror Common Shares), in each case, to the extent such consent, approval or other action would prevent, enjoin or materially delay the performance by such Sponsor of its, his or her obligations under this Sponsor Agreement, the Business
Combination Agreement or any Ancillary Agreement, or (iv) result in the creation or imposition of any Lien on such Sponsor’s Acquiror Common Shares. 

(d) Litigation. As of the date hereof, there are no Actions pending against such Sponsor or, to the knowledge of such Sponsor, any of
its Affiliates, or to the knowledge of such Sponsor, threatened against such Sponsor or any of its Affiliates, before (or, in the case of threatened Actions, that would be before) any arbitrator or any Governmental Authority, which in any manner
challenges or seeks to prevent, enjoin or materially delay the ability of such Sponsor to perform its obligations under this Sponsor Agreement, the Business Combination Agreement or any Ancillary Agreement. As of the date hereof, none of such
Sponsor or, to the knowledge of such Sponsor, any of its Affiliates is subject to any Governmental Order that would reasonably be expected, individually or in the aggregate, to prevent, enjoin or materially delay such Sponsor’s ability to
perform its obligations under this Sponsor Agreement, the Business Combination Agreement or any Ancillary Agreement. 
 (e) Brokerage
Fees. Except as described on Section 4.14 of the Acquiror Disclosure Letter, no broker, finder, investment banker or other Person is entitled to any brokerage fee, finders’ fee or other commission in connection with the transactions
contemplated by the Business Combination Agreement based upon arrangements made by such Sponsor, for which Acquiror or any of its Affiliates may become liable. 

(f) Affiliate Arrangements. Except as set forth on Schedule II attached hereto, neither such Sponsor nor any anyone related by
blood, marriage or adoption to such Sponsor or, to the knowledge of such Sponsor, any Person in which such Sponsor has a direct or indirect legal, contractual or beneficial ownership of 5% or greater is party to, or has any rights with respect to or
arising from, any Contract with Acquiror or its Subsidiaries. 

  
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 (g) Acknowledgment. Such Sponsor understands and acknowledges that each of Acquiror
and the Company is entering into the Business Combination Agreement in reliance upon such Sponsor’s execution and delivery of this Sponsor Agreement. 

(h) No Other Representations or Warranties. Except for the representations and warranties expressly made by such Sponsors in this
Article II, neither such Sponsor nor any other Person on behalf of such Sponsor makes any express or implied representation or warranty to Acquiror or the Company in connection with this Sponsor Agreement or the transactions contemplated by
this Sponsor Agreement, and each Sponsor expressly disclaims any such other representations or warranties. 
 ARTICLE III 

MISCELLANEOUS 

Section 3.1 Termination. This Sponsor Agreement and all of its provisions shall terminate and be of no further force or effect
upon the earlier of (a) the Closing, (b) such date and time as the Business Combination Agreement shall be terminated in accordance with Article IX thereof (the earlier of clauses (a) and (b), the “Expiration Time”),
and (c) the written agreement of the Sponsor Holdco, Acquiror and the Company. Upon such termination of this Sponsor Agreement, all obligations of the parties under this Sponsor Agreement will terminate, without any liability or other
obligation on the part of any party hereto to any Person in respect hereof or the transactions contemplated hereby, and no party hereto shall have any claim against another (and no Person shall have any rights against such party), whether under
contract, tort or otherwise, with respect to the subject matter hereof; provided, however, that (i) the termination of this Sponsor Agreement shall not relieve any party hereto from liability arising in respect of any breach of
this Sponsor Agreement prior to such termination or actual fraud, (ii) this Article III shall survive any termination of this Sponsor Agreement, and (iii) Sections 1.5(b)(iii), 1.6 and 1.7 shall survive the termination of this
Sponsor Agreement pursuant to Section 3.1(a). 
 Section 3.2 Governing Law. This Sponsor Agreement, and all claims or
causes of action (whether in contract or tort) that may be based upon, arise out of or relate to this Sponsor Agreement or the negotiation, execution or performance of this Sponsor Agreement (including any claim or cause of action based upon,
arising out of or related to any representation or warranty made in or in connection with this Sponsor Agreement) will be governed by and construed in accordance with the internal Laws of the State of Delaware applicable to agreements executed and
performed entirely within such State. 
 Section 3.3 CONSENT TO JURISDICTION AND SERVICE OF PROCESS; WAIVER OF JURY TRIAL. 

(a) ANY PROCEEDING OR ACTION BASED UPON, ARISING OUT OF OR RELATED TO THIS SPONSOR AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY MUST BE
BROUGHT IN THE COURT OF CHANCERY OF THE STATE OF DELAWARE (OR, ONLY TO THE EXTENT SUCH COURT DOES NOT 

  
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HAVE SUBJECT MATTER JURISDICTION, THE SUPERIOR COURT OF THE STATE OF DELAWARE OR, IF IT HAS OR CAN ACQUIRE JURISDICTION, IN THE UNITED STATES DISTRICT COURT FOR THE DISTRICT OF DELAWARE), AND
EACH OF THE PARTIES IRREVOCABLY AND UNCONDITIONALLY (I) CONSENTS AND SUBMITS TO THE EXCLUSIVE JURISDICTION OF EACH SUCH COURT IN ANY SUCH PROCEEDING OR ACTION, (II) WAIVES ANY OBJECTION IT MAY NOW OR HEREAFTER HAVE TO PERSONAL
JURISDICTION, VENUE OR TO CONVENIENCE OF FORUM, (III) AGREES THAT ALL CLAIMS IN RESPECT OF SUCH PROCEEDING OR ACTION SHALL BE HEARD AND DETERMINED ONLY IN ANY SUCH COURT AND (IV) AGREES NOT TO BRING ANY PROCEEDING OR ACTION ARISING OUT OF
OR RELATING TO THIS SPONSOR AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY IN ANY OTHER COURT. SERVICE OF PROCESS WITH RESPECT THERETO MAY BE MADE UPON ANY PARTY TO THIS SPONSOR AGREEMENT BY MAILING A COPY THEREOF BY REGISTERED OR CERTIFIED MAIL,
POSTAGE PREPAID, TO SUCH PARTY AT ITS ADDRESS AS PROVIDED IN SECTION 3.8, WITHOUT LIMITING THE RIGHT OF A PARTY TO SERVE PROCESS IN ANY OTHER MATTER PERMITTED BY APPLICABLE LAWS. 

(b) WAIVER OF TRIAL BY JURY. EACH PARTY HERETO HEREBY ACKNOWLEDGES AND AGREES THAT ANY CONTROVERSY WHICH MAY ARISE UNDER THIS SPONSOR
AGREEMENT IS LIKELY TO INVOLVE COMPLICATED AND DIFFICULT ISSUES, AND THEREFORE EACH SUCH PARTY HEREBY IRREVOCABLY AND UNCONDITIONALLY WAIVES ANY RIGHT SUCH PARTY MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY LITIGATION DIRECTLY OR INDIRECTLY ARISING
OUT OF OR RELATING TO THIS SPONSOR AGREEMENT OR THE TRANSACTIONS CONTEMPLATED BY THIS SPONSOR AGREEMENT. EACH PARTY CERTIFIES AND ACKNOWLEDGES THAT (I) NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY OR
OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVER, (II) EACH SUCH PARTY UNDERSTANDS AND HAS CONSIDERED THE IMPLICATIONS OF THIS WAIVER, (III) EACH SUCH PARTY MAKES THIS WAIVER
VOLUNTARILY, AND (IV) EACH SUCH PARTY HAS BEEN INDUCED TO ENTER INTO THIS SPONSOR AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS SECTION 3.3. 

Section 3.4 Assignment. This Sponsor Agreement and all of the provisions hereof will be binding upon and inure to the benefit of
the parties hereto and their respective heirs, successors and permitted assigns. Neither this Sponsor Agreement nor any of the rights, interests or obligations hereunder will be assigned (including by operation of law) without the prior written
consent of Acquiror, the Company and the Sponsor Holdco. 
 Section 3.5 Specific Performance. The parties hereto agree that
irreparable damage may occur in the event that any of the provisions of this Sponsor Agreement were not performed in accordance with their specific terms or were otherwise breached. It is accordingly agreed that the parties hereto shall be entitled
to seek an injunction or injunctions to prevent breaches of this Sponsor Agreement and to enforce specifically the terms and provisions of this Sponsor Agreement, this being in addition to any other remedy to which such party is entitled at law or
in equity. 

  
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 Section 3.6 Amendment. This Sponsor Agreement may not be amended, changed,
supplemented, waived or otherwise modified, except upon the execution and delivery of a written agreement executed by Acquiror, the Company and the Sponsor Holdco. 

Section 3.7 Severability. If any provision of this Sponsor Agreement is held invalid or unenforceable by any court of competent
jurisdiction, the other provisions of this Sponsor Agreement will remain in full force and effect. Any provision of this Sponsor Agreement held invalid or unenforceable only in part or degree will remain in full force and effect to the extent not
held invalid or unenforceable. 
 Section 3.8 Notices. All notices and other communications among the parties hereto shall be in
writing and shall be deemed to have been duly given (a) when delivered in person, (b) when delivered after posting in the United States mail having been sent registered or certified mail return receipt requested, postage prepaid,
(c) when delivered by FedEx or other nationally recognized overnight delivery service or (d) when e-mailed during normal business hours (and otherwise as of the immediately following Business Day),
addressed as follows: 
 If to Acquiror: 

Social Capital Suvretta Holdings Corp. III 

2850 W. Horizon Ridge Parkway, Suite 200 

Henderson, NV 89052 
 Attention:
    James Ryans, Chief Financial Officer 
 Email:          
legal@socialcapital.com 
 with a copy to (which will not constitute notice): 

Wachtell, Lipton, Rosen & Katz 

51 W. 52nd Street 
 New York, New
York 10019 
 Attention:     Raaj S. Narayan 

Email:           rsnarayan@wlrk.com 

If to the Company: 

ProKidney GP Limited 
 70 Sir John
Rogerson’s Quay 
 Dublin 2, Ireland 

Attention:     Tim Bertram, Director 

Email:           Tim.Bertram@prokidney.com 

  
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 with a copy to (which will not constitute notice): 

Davis Polk & Wardwell LLP 

450 Lexington Ave 
 New York, NY
10017 
 Attention:     Richard D. Truesdell Jr., Lee Hochbaum 

Email:           richard.truesdell@davispolk.com, lee.hochbaum@davispolk.com 

and 
 Mintz, Levin, Cohn, Ferris,
Glovsky and Popeo, P.C. 
 555 12th Street NW 

Suite 1100 
 Washington, D.C.
20004 
 Attention:     Matthew Simpson 

Email:           MTSimpson@mintz.com 

If to a Sponsor: 
 To such
Sponsor’s address set forth in Schedule I 
 with a copy to (which will not constitute notice): 

Wachtell, Lipton, Rosen & Katz 

51 W. 52nd Street 
 New York, New
York 10019 
 Attention:     Raaj S. Narayan 

Email:           rsnarayan@wlrk.com 

Section 3.9 Counterparts. This Sponsor Agreement may be executed in two or more counterparts (any of which may be delivered by
electronic transmission), each of which shall constitute an original, and all of which taken together shall constitute one and the same instrument. 

Section 3.10 Entire Agreement. This Sponsor Agreement and the agreements referenced herein constitute the entire agreement and
understanding of the parties hereto in respect of the subject matter hereof and supersede all prior understandings, agreements or representations by or among the parties hereto to the extent they relate in any way to the subject matter hereof. 

[THE REMAINDER OF THIS PAGE IS INTENTIONALLY BLANK] 

  
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 IN WITNESS WHEREOF, the Sponsors, Acquiror and the Company have each caused this Sponsor
Agreement to be duly executed as of the date first written above. 
  

			
	 SPONSORS:

	
	 SCS SPONSOR III LLC

		
	 By:
	 	/s/ Chamath Palihapitiya
		 	 Name: Chamath Palihapitiya

		 	 Title: Chief Executive Officer

	
	/s/ Chamath Palihapitiya
	 Name: Chamath Palihapitiya

	
	 /s/ Kishen Mehta

	 Name: Kishen Mehta

	
	 /s/ James Ryans

	 Name: James Ryans

	
	 /s/ Marc Semigran

	 Name: Marc Semigran

	
	 /s/ Uma Sinha

	 Name: Uma Sinha

 [Signature Page to Sponsor Support Agreement] 

 
			
	 ACQUIROR:

	
	 SOCIAL CAPITAL SUVRETTA HOLDINGS CORP. III

		
	 By:
	 	/s/ Chamath Palihapitiya
		 	 Name: Chamath Palihapitiya

		 	 Title: Chief Executive Officer

 [Signature Page to Sponsor Support Agreement] 

 
			
	 COMPANY:

	
	For and on behalf of PROKIDNEY LP
by its general partner, PROKIDNEY GP LIMITED
		
	 By:
	 	/s/ Jaime Gomez Sotomayor
	 Name:
	 	 Jaime Gomez Sotomayor

	 Title:
	 	 Director of ProKidney GP Limited

 [Signature Page to Sponsor Support Agreement] 

 Schedule I 

Sponsor Acquiror Common Shares 
  

			
	 Sponsor
	  	Acquiror Common Shares
	 SCS Sponsor III LLC

c/o Social Capital Suvretta Holdings Corp. III

2850 W. Horizon Ridge Parkway Suite 200, Henderson, NV 89052
	  	6,860,000(1)
	 Chamath Palihapitiya

c/o Social Capital Suvretta Holdings Corp. III

2850 W. Horizon Ridge Parkway Suite 200, Henderson, NV 89052
	  	—(2)
	 Kishan Mehta

c/o Social Capital Suvretta Holdings Corp. III

2850 W. Horizon Ridge Parkway Suite 200, Henderson, NV 89052
	  	—(2)
	 James Ryans

c/o Social Capital Suvretta Holdings Corp. III

2850 W. Horizon Ridge Parkway Suite 200, Henderson, NV 89052
	  	—  
	 Shoney Katz

c/o Social Capital Suvretta Holdings Corp. III

2850 W. Horizon Ridge Parkway Suite 200, Henderson, NV 89052
	  	—  
	 Marc Semigran

c/o Social Capital Suvretta Holdings Corp. III

2850 W. Horizon Ridge Parkway Suite 200, Henderson, NV 89052
	  	30,000(3)
	 Uma Sinha

c/o Social Capital Suvretta Holdings Corp. III

2850 W. Horizon Ridge Parkway Suite 200, Henderson, NV 89052
	  	30,000(4)

  

	(1)	 Includes 640,000 shares of Acquiror Class A Common Stock and 6,220,000 shares of Acquiror Class B
Common Stock. 

	(2)	 Messrs. Palihapitiya and Mehta may be deemed to beneficially own securities held by SCS Sponsor III LLC by
virtue of their shared control over SCS Sponsor III LLC. Each of Messrs. Palihapitiya and Mehta disclaims beneficial ownership of securities held by SCS Sponsor III LLC. 

	(3)	 Includes 30,000 shares of Acquiror Class B Common Stock. 

	(4)	 Includes 30,000 restricted stock units (“RSUs”), granted to Ms. Sinha pursuant to a
Director Restricted Stock Unit Award Agreement, dated as of September 24, 2021, between Acquiror and Ms. Sinha, which grant is contingent on (i) the Acquiror’s consummation of an initial business combination and (ii) a
shareholder approved equity plan. The RSUs will vest upon the consummation of such initial business combination and represent 30,000 Class A ordinary shares of Acquiror that will settle on a date determined in the sole discretion of the
Acquiror that shall occur between the vesting date and March 15 of the year following the year in which vesting occurs. 

  

  
 [Schedule I to Sponsor
Support Agreement] 

 Schedule II 

Affiliate Agreements 
  

	1.	 Letter Agreement, dated as of June 29, 2021, among Acquiror, the Sponsor, Chamath Palihapitiya, Kishan
Mehta, James Ryans, Shoney Katz and Marc Semigran. 

  

	2.	 Registration Rights Agreement, dated as of June 29, 2021, among Acquiror, the Sponsor and Marc Semigran.

  

	3.	 Administrative Services Agreement, dated as of June 29, 2021, between Acquiror and Social + Capital
Partnership, LLC. 

  

	4.	 Private Placement Shares Purchase Agreement, dated as of June 29, 2021, between Acquiror and the Sponsor.

  

	5.	 Indemnity Agreement, dated as of June 29, 2021, between Acquiror and Chamath Palihapitiya.

  

	6.	 Indemnity Agreement, dated as of June 29, 2021, between Acquiror and Kishan Mehta. 

 

	7.	 Indemnity Agreement, dated as of June 29, 2021, between Acquiror and James Ryans. 

 

	8.	 Indemnity Agreement, dated as of June 29, 2021, between Acquiror and Shoney Katz. 

 

	9.	 Indemnity Agreement, dated as of June 29, 2021, between Acquiror and Marc Semigran. 

 

	10.	 Letter Agreement, dated as of September 24, 2021, between Acquiror and Uma Sinha. 

 

	11.	 Indemnity Agreement, dated as of September 24, 2021, between Acquiror and Uma Sinha.

  

	12.	 Director Restricted Stock Unit Award Agreement, dated as of September 24, 2021, between Acquiror and Uma
Sinha. 

 [Schedule II to Sponsor Support Agreement] 

 Annex A 

Form of Joinder Agreement 
 This Joinder
Agreement (this “Joinder Agreement”) is made as of the date written below by the undersigned (the “Joining Party”) in accordance with the Sponsor Support Agreement, dated as of January 18, 2022 (as amended,
supplemented or otherwise modified from time to time, the “Support Agreement”), by and among Social Capital Suvretta Holdings Corp. III, a Cayman Islands exempted company limited by shares, ProKidney LP, a limited partnership
organized under the laws of Ireland, and the Sponsors set forth on Schedule I thereto. Capitalized terms used herein and not otherwise defined shall have the meaning ascribed to them in the Support Agreement. 

The Joining Party hereby acknowledges, agrees and confirms that, by its execution of this Joinder Agreement, the Joining Party shall be deemed to be a party
to, and a “Sponsor” under, the Support Agreement as of the date hereof and shall have all of the rights and obligations of a Sponsor as if it had executed the Support Agreement. The Joining Party hereby ratifies, as of the date hereof, and
agrees to be bound by, all of the terms, provisions and conditions contained in the Support Agreement. 
 IN WITNESS WHEREOF, the undersigned has duly
executed this Joinder Agreement as of the date written below. 
 Date: 

			
		
	By:	 	 
		 	Name:
		 	Title:
	
	Address for Notices:
	
	With copies to:

 [Annex A to Sponsor Support Agreement]EX-10.4

 Exhibit 10.4 

EXECUTION VERSION 

COMPANY UNITHOLDER SUPPORT AGREEMENT 

This Company Unitholder Support Agreement (this “Agreement”) is dated as of January 18, 2022 by and among Social Capital
Suvretta Holdings Corp. III, a Cayman Islands exempted company limited by shares (“Acquiror”), the Persons set forth on Schedule I hereto (each, a “Company Unitholder” and, collectively, the “Company
Unitholders”), and ProKidney LP, a limited partnership organized under the laws of Ireland (the “Company”), acting through its general partner ProKidney GP Limited, a private limited company incorporated under the laws of
Ireland (the “Legacy General Partner”). Except as otherwise specified, capitalized terms used but not defined herein shall have the respective meanings ascribed to such terms in the Business Combination Agreement (as defined below).

 RECITALS 
 WHEREAS,
as of the date hereof, the Company Unitholders are the holders of record and the “beneficial owners” (within the meaning of Rule 13d-3 under the Exchange Act) of such number of units of such classes
or series of Company partnership interests (“Company Units”) as are indicated opposite each of their names on Schedule I attached hereto (all such Company Units, together with any Company Units of which ownership of record or
the power to vote (including, without limitation, by proxy or power of attorney) is hereafter acquired by any such Company Unitholder during the period from the date hereof through the Expiration Time are referred to herein as the “Subject
Units”); 
 WHEREAS, contemporaneously with the execution and delivery of this Agreement, Acquiror and the Company have entered
into a Business Combination Agreement (as amended or modified from time to time, the “Business Combination Agreement”), dated as of the date hereof, pursuant to which, among other things, (a) the Company shall issue New Company
Common Units to Acquiror in exchange for a combination of shares of Acquiror Class B Common Stock and cash, (b) New GP shall be admitted as the general partner of the Company and (c) the Company shall distribute the shares of Acquiror
Class B Common Stock received from Acquiror to the Existing Company Unitholders in accordance with the Amended and Restated Company Limited Partnership Agreement (collectively, the “Business Combination”); and 

WHEREAS, as an inducement to Acquiror and the Company to enter into the Business Combination Agreement and to consummate the transactions
contemplated therein, the parties hereto desire to agree to certain matters as set forth herein. 
 AGREEMENT 

NOW, THEREFORE, in consideration of the foregoing and the mutual agreements contained herein, and intending to be legally bound hereby, the
parties hereto hereby agree as follows: 

 ARTICLE I 

COMPANY UNITHOLDER SUPPORT AGREEMENT; COVENANTS 

Section 1.1 Binding Effect of Business Combination Agreement. Each Company Unitholder hereby acknowledges that it has read the
Business Combination Agreement and this Agreement and has had the opportunity to consult with its tax and legal advisors. Each Company Unitholder hereby agrees that (i) such Company Unitholder shall be bound by and comply with Section 5.5
(Acquisition Proposals), Section 7.1 (Antitrust Approvals; Other Filings) and Section 10.12 (Publicity) of the Business Combination Agreement (and any relevant defined terms contained in any such Sections) as if
(a) such Company Unitholder was an original signatory to the Business Combination Agreement with respect to such provisions, and (b) each reference to the “Company” contained in Section 5.5 of the Business Combination
Agreement (other than Section 5.5(i) or for purposes of the definition of Acquisition Proposal) also refers to each such Company Unitholder, and (ii) such Company Unitholder shall provide to the Acquiror, the Company and their respective
Representatives any information regarding such Company Unitholder or the Subject Units that is reasonably requested by the Acquiror, the Company or their respective Representatives and is required in order for the Company and the Acquiror to comply
with Sections 7.1, 7.2, 7.3 and 7.5 of the Business Combination Agreement. 
 Section 1.2 No Transfer. During the period
commencing on the date hereof and ending at the Expiration Time (as defined below), each Company Unitholder shall not (i) sell, offer to sell, contract or agree to sell, hypothecate, pledge, grant any option to purchase or otherwise dispose of
or agree to dispose of, directly or indirectly, file (or participate in the filing of) a registration statement with the SEC or establish or increase a put equivalent position or liquidate or decrease a call equivalent position within the meaning of
Section 16 of the Exchange Act, with respect to any Subject Units, (ii) enter into any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of any Subject Units (clauses
(i) and (ii) collectively, a “Transfer”) or (iii) publicly announce any intention to effect any transaction specified in clause (i) or (ii); provided, however, that the foregoing shall not apply to any
Transfer to the Company’s officers or directors, any direct or indirect Affiliates or immediate family member of any of the Company’s officers or directors (as defined in the Securities and Exchange Act of 1934, as amended), any direct or
indirect Affiliates or immediate family member of the Company Unitholder, or any members, stockholders or partners of the Company or its Affiliates or the Company Unitholder, so long as in each case, prior to and as a condition to the effectiveness
of any such Transfer, the transferee in such Transfer executes and delivers to Acquiror a joinder to this Agreement in the form attached hereto as Annex A to the extent such transferee is not already a party hereto. 

Section 1.3 New Units. In the event that (a) any Subject Units are issued to a Company Unitholder after the date of this
Agreement pursuant to any stock dividend, stock split, recapitalization, reclassification, combination or exchange of Subject Units or otherwise, (b) a Company Unitholder purchases or otherwise acquires beneficial ownership of any Subject Units
after the date of this Agreement or (c) a Company Unitholder acquires the right to vote or share in the voting of any Subject Units after the date of this Agreement (collectively, the “New Securities”), then such New Securities
acquired or purchased by such Company Unitholder shall be subject to the terms of this Agreement to the same extent as if they constituted the Subject Units owned by such Company Unitholder as of the date hereof. 

  
 2 

 Section 1.4 Company Unitholder Agreements. 

(a) Until the Expiration Time, each Company Unitholder hereby unconditionally and irrevocably agrees that, at any meeting of the partners of
the Company (or any adjournment or postponement thereof) and in any action by written consent of the partners (with voting rights) of the Company distributed by the Legacy General Partner or otherwise undertaken in connection with or as contemplated
by the Business Combination Agreement or the transactions contemplated thereby, including in the form attached hereto as Exhibit A (the “Written Consent”), such Company Unitholder shall, if a meeting is held, appear at the
meeting, in person or by proxy, or otherwise cause its Subject Units (to the extent such Subject Units are entitled to vote on or provide consent with respect to such matter) to be counted as present thereat for purposes of establishing a quorum,
and such Company Unitholder shall vote or provide consent (or cause to be voted or consented), in person or by proxy, all of its Subject Units (to the extent such Subject Units are entitled to vote on or provide consent with respect to such matter)
in the following manner, and, without limiting the foregoing, such Company Unitholder shall deliver the Written Consent executed by such Company Unitholder to the Company concurrently with or prior to the execution of the Business Combination
Agreement: 
 (i) to approve and adopt the Business Combination Agreement and the transactions contemplated thereby, including the Business
Combination; 
 (ii) in any other circumstances upon which a consent, waiver or other approval may be required under the Governing Documents
of the Company or under the Business Combination Agreement or the transactions contemplated thereby, or any Ancillary Agreement, to vote, consent, waive or approve (or cause to be voted, consented, waived or approved) all of such Company
Unitholder’s Subject Units held at such time in favor thereof; 
 (iii) against any merger agreement, merger, consolidation,
combination, sale of equity or substantial assets, reorganization, recapitalization, dissolution, liquidation or winding up of or by the Company or any of its Subsidiaries (other than the Business Combination Agreement and the transactions
contemplated thereby); and 
 (iv) against any proposal, action or agreement that, to the knowledge of such Company Unitholder, would
(A) impede, frustrate, prevent or nullify any provision of this Agreement, the Business Combination Agreement or the transactions contemplated thereby, including the Business Combination, (B) result in a breach in any respect of any
covenant, representation, warranty or any other obligation or agreement of the Company under the Business Combination Agreement or (C) result in any of the conditions set forth in Article VIII of the Business Combination Agreement not being
fulfilled. 
 (b) Each Company Unitholder hereby agrees that it shall not commit in writing or agree in writing to take any action
inconsistent with the foregoing. Without limiting the generality of the foregoing, each Company Unitholder hereby agrees: 
 (i) not to
deposit any of its Subject Units in a voting trust or subject any of its Subject Units to any arrangement or agreement with respect to the voting of such Subject Units unless specifically requested to do so by the Company and Acquiror in writing in
connection with the Business Combination Agreement, the Ancillary Agreements or the Transactions. 

  
 3 

 (ii) except as contemplated by the Business Combination Agreement or any Ancillary
Agreement, not to make, or in any manner participate in, directly or indirectly, a “solicitation” of “proxies” or consents (as such terms are used in the rules of the SEC) or powers of attorney or similar rights to vote, or seek
to advise or influence any Person with respect to the voting of, any equity interests of the Company in connection with any vote or other action with respect to the Transactions, other than to recommend that the equityholders of the Company vote in
favor of the Transactions and the Business Combination Agreement (and any actions required in furtherance thereof and otherwise as expressly provided in this Section 1.4); and 

(iii) not to commence or participate in any claim, derivative or otherwise, against the Company, the Acquiror, the Sponsor or any of their
respective Affiliates relating to the negotiation, execution or delivery of this Agreement, the Business Combination Agreement, the Ancillary Agreements or the consummation of the Transactions, including any claim (A) challenging the validity
of, or seeking to enjoin the operation of, any provision of this Agreement or (B) alleging a breach of any fiduciary duty of the Legacy General Partner, the Sponsor or the directors or officers of the Legacy General Partner, Sponsor, Acquiror
or the Company in connection with this Agreement, the Business Combination Agreement or the Transactions. 
 Section 1.5 Affiliate
Agreements. Each Company Unitholder, severally and not jointly, hereby agrees and consents on behalf of itself and each of its controlled Affiliates to the termination of all Affiliate Agreements set forth on Section 5.4 of the Company
Disclosure Letter to which such Company Unitholder is party, effective as of the Effective Time without any further liability or obligation to the Company, the Company’s Subsidiaries or Acquiror. 

Section 1.6 Registration Rights Agreement. Each of the Company Unitholders, on behalf of itself, agrees that it will deliver,
substantially simultaneously with the Effective Time, a duly-executed copy of the Registration Rights Agreement substantially in the form attached as Exhibit H to the Business Combination Agreement (with such changes as may be agreed in writing by
Acquiror, the Company and the Company Unitholders). 
 Section 1.7 Lock-Up Agreement.
Each of the Company Unitholders, on behalf of itself, agrees that it will deliver, substantially simultaneously with the Effective Time, a duly-executed copy of the Lock-Up Agreement substantially in the form
attached as Exhibit I to the Business Combination Agreement (with such changes as may be agreed in writing by Acquiror, the Company and the Company Unitholders). 

Section 1.8 Further Assurances. Each Company Unitholder shall take, or cause to be taken, all such further actions and do, or
cause to be done, all things reasonably necessary (including under applicable Laws) to effect the actions required to consummate the Business Combination and the other transactions contemplated by this Agreement and the Business Combination
Agreement, in each case, on the terms and subject to the conditions set forth therein and herein, as applicable. 

  
 4 

 Section 1.9 No Inconsistent Agreement. Each Company Unitholder hereby represents
and covenants that such Company Unitholder has not entered into, and shall not enter into, any agreement that would restrict, limit or interfere with the performance of such Company Unitholder’s obligations hereunder. 

Section 1.10 No Challenges. Each Company Unitholder agrees not to voluntarily commence, join in, facilitate, assist or encourage,
and agrees to take all actions necessary to opt out of any class in any class action with respect to, any claim, derivative or otherwise, against Acquiror, the Company or any of their respective successors, directors, officers or Affiliates,
(a) challenging the validity of, or seeking to enjoin the operation of, any provision of this Agreement or the Business Combination Agreement or (b) alleging a breach of any fiduciary duty of any Person in connection with the evaluation,
negotiation or entry into the Business Combination Agreement. Notwithstanding the foregoing, nothing herein shall be deemed to prohibit such Company Unitholder from enforcing such Company Unitholder’s rights under this Agreement and the other
agreements entered into by such Company Unitholder in connection herewith. 
 Section 1.11 Consent to Disclosure. As and to the
extent required by applicable securities Laws or the SEC or any other securities authorities, and subject to the Company Unitholder’s right to a reasonable opportunity to review such documents (to the extent reasonably practicable), each
Company Unitholder hereby consents to the publication and disclosure in the Proxy Statement (and, as and to the extent otherwise required by applicable securities Laws or the SEC or any other securities authorities, any other documents or
communications provided by Acquiror or the Company to any Governmental Authority or to securityholders of Acquiror) of such Company Unitholder’s identity and beneficial ownership of Subject Units and the nature of such Company Unitholder’s
commitments, arrangements and understandings under and relating to this Agreement and, if deemed appropriate by Acquiror or the Company, a copy of this Agreement. Each Company Unitholder will promptly provide any information reasonably requested by
Acquiror or the Company for any regulatory application or filing made or approval sought in connection with the transactions contemplated by the Business Combination Agreement (including filings with, or submissions to, the SEC), except for any
information that is subject to attorney-client privilege (provided, that to the extent reasonably possible, the parties shall cooperate in good faith to permit disclosure of such information in a manner that preserves such privilege). 

Section 1.12 No Agreement as Director or Officer. Notwithstanding anything to the contrary herein, each Company Unitholder is
entering into this Agreement solely in the Company Unitholder’s capacity as record or beneficial owner of Subject Units and nothing herein is intended to or shall limit or affect any actions taken by any employee, officer, director (or person
performing similar functions), partner or other Affiliate of such Company Unitholder (including, for this purpose, any appointee or representative of such Company Unitholder on the Board of Directors of the Company), solely in his or her capacity as
a director or officer of the Company (or a Subsidiary of the Company). 

  
 5 

 ARTICLE II 

REPRESENTATIONS AND WARRANTIES 

Section 2.1 Representations and Warranties of the Company Unitholders. Each Company Unitholder represents and warrants as of the
date hereof and as of the Closing to Acquiror and the Company (severally and not jointly, and solely with respect to itself, himself or herself and not with respect to any other Company Unitholder) as follows: 

(a) Organization; Due Authorization. If such Company Unitholder is not an individual, it is duly organized, validly existing and in
good standing under the Laws of the jurisdiction in which it is incorporated, formed, organized or constituted, and the execution, delivery and performance of this Agreement and the consummation of the transactions contemplated hereby are within
such Company Unitholder’s corporate, limited liability company or organizational powers and have been duly authorized by all necessary corporate, limited liability company or organizational actions on the part of such Company Unitholder. Such
Company Unitholder has full legal capacity, right and authority to execute and deliver this Agreement and to perform its obligations hereunder. This Agreement has been duly executed and delivered by such Company Unitholder and, assuming due
authorization, execution and delivery by the other parties to this Agreement, this Agreement constitutes a legally valid and binding obligation of such Company Unitholder, enforceable against such Company Unitholder in accordance with the terms
hereof (except as enforceability may be limited by bankruptcy Laws, other similar Laws affecting creditors’ rights and general principles of equity affecting the availability of specific performance and other equitable remedies). If this
Agreement is being executed in a representative or fiduciary capacity, the Person signing this Agreement has full power and authority to enter into this Agreement on behalf of the applicable Company Unitholder. 

(b) Ownership. Such Company Unitholder is the record and beneficial owner (within the meaning of Rule
13d-3 under the Exchange Act) of, and has good title to, all of such Company Unitholder’s Subject Units, and there exist no Liens or any other limitation or restriction (including any restriction on the
right to vote, sell or otherwise dispose of such Subject Units) affecting any such Subject Units, other than Liens (a) pursuant to (i) this Agreement, (ii) the Company’s Governing Documents, (iii) the Business Combination
Agreement (including the Company Disclosure Letter) or (iv) any applicable securities Laws or (b) that would not, individually or in the aggregate, reasonably be expected to prevent, delay or impair the ability of such Company Unitholder
to perform its obligations under this Agreement or the consummation of the transactions contemplated by this Agreement or the Business Combination Agreement. Such Company Unitholder’s Subject Units are the only partnership or other equity
interests in the Company owned of record or beneficially by such Company Unitholder on the date of this Agreement, and none of such Company Unitholder’s Subject Units are subject to any proxy, voting trust or other agreement or arrangement with
respect to the voting of such Subject Units. Other than as set forth opposite such Company Unitholder’s name on Schedule I hereto, such Company Unitholder does not hold or own any rights to acquire (directly or indirectly) any
partnership or other equity interests of the Company or any partnership or other equity interests convertible into, or which can be exchanged for, partnership or other equity interests of the Company. 

  
 6 

 (c) No Conflicts. The execution and delivery of this Agreement by such Company
Unitholder does not, and the performance by such Company Unitholder of his, her or its obligations hereunder will not, (i) result in a violation of applicable Law, except for such violations which would not reasonably be expected, individually
or in the aggregate, to have a material effect upon such Company Unitholder’s ability to perform its obligations under this Agreement, the Business Combination Agreement or any Ancillary Agreement, (ii) if such Company Unitholder is not an
individual, conflict with or result in a violation of the organizational documents of such Company Unitholder, (iii) require any consent or approval that has not been given or other action that has not been taken by any Person (including under
any Contract binding upon such Company Unitholder or such Company Unitholder’s Subject Units), in each case, to the extent such consent, approval or other action would prevent, enjoin or delay the performance by such Company Unitholder of its,
his or her obligations under this Agreement, the Business Combination Agreement or any Ancillary Agreement or (iv) result in the creation or imposition of any Lien on such Company Unitholder’s Subject Units. 

(d) Litigation. As of the date hereof, there are no Actions pending against such Company Unitholder or, to the knowledge of such
Company Unitholder, any of its Affiliates, if applicable, or, to the knowledge of such Company Unitholder, threatened against such Company Unitholder or any of its Affiliates, if applicable, before (or, in the case of threatened Actions, that would
be before) any arbitrator or any Governmental Authority, which in any manner challenges or seeks to prevent, enjoin or delay the ability of such Company Unitholder to perform its obligations under this Agreement, the Business Combination Agreement
or any Ancillary Agreement. As of the date hereof, none of such Company Unitholder or, to the knowledge of such Company Unitholder, any of its Affiliates is subject to any Governmental Order that would reasonably be expected, individually or in the
aggregate, to prevent, enjoin or materially delay such Company Unitholder’s ability to perform its obligations under this Agreement, the Business Combination Agreement or any Ancillary Agreement. 

(e) Adequate Information. Such Company Unitholder is a sophisticated stockholder and has adequate information concerning the business
and financial condition of Acquiror and the Company to make an informed decision regarding this Agreement and the transactions contemplated by the Business Combination Agreement and has independently and without reliance upon Acquiror or the Company
and based on such information as such Company Unitholder has deemed appropriate, made its own analysis and decision to enter into this Agreement. Such Company Unitholder acknowledges that Acquiror and the Company have not made and do not make any
representation or warranty, whether express or implied, of any kind or character except as expressly set forth in this Agreement. Such Company Unitholder acknowledges that the agreements contained herein with respect to the Subject Units held by
such Company Unitholder are irrevocable. 
 (f) Brokerage Fees. Except as described on Section 3.16 of the Company Disclosure
Letter, no broker, finder, investment banker or other Person is entitled to any brokerage fee, finders’ fee or other commission in connection with the transactions contemplated by the Business Combination Agreement based upon arrangements made
by such Company Unitholder, for which the Company or any of its Affiliates may become liable. 
 (g) Acknowledgment. Such Company
Unitholder understands and acknowledges that each of Acquiror and the Company is entering into the Business Combination Agreement in reliance upon such Company Unitholder’s execution and delivery of this Agreement. 

  
 7 

 Section 2.2 No Other Representations or Warranties. Except for the
representations and warranties made by each Company Unitholder in this ARTICLE II, the Registration Rights Agreement, the Lock-Up Agreement, the Amended and Restated Company Limited Partnership
Agreement, the Tax Receivable Agreement, the Exchange Agreement or any other agreement contemplated by the Business Combination Agreement, no Company Unitholder makes any express or implied representation or warranty to Acquiror in connection with
this Agreement or the transactions contemplated by this Agreement, and each Company Unitholder expressly disclaims any such other representations or warranties. 

ARTICLE III 

MISCELLANEOUS 

Section 3.1 Termination. This Agreement and all of its provisions shall terminate and be of no further force or effect upon the
earlier of (a) the Closing, (b) such date and time as the Business Combination Agreement shall be terminated in accordance with Article IX thereof (the earlier of clauses (a) and (b), the “Expiration Time”), and
(c) the written agreement of Acquiror, the Company and each Company Unitholder. Upon such termination of this Agreement, all obligations of the parties under this Agreement will terminate, without any liability or other obligation on the part
of any party hereto to any Person in respect hereof or the transactions contemplated hereby, and no party hereto shall have any claim against another (and no person shall have any rights against such party), whether under contract, tort or
otherwise, with respect to the subject matter hereof; provided, however, that (i) the termination of this Agreement shall not relieve any party hereto from liability arising in respect of any breach of this Agreement prior to such
termination or actual fraud, (ii) this ARTICLE III shall survive the termination of this Agreement and (iii) Sections 1.4(b)(iii), 1.5, 1.6, 1.7 and 1.8 shall survive the termination of this Agreement pursuant to
Section 3.1(a). 
 Section 3.2 Governing Law. This Agreement, and all claims or causes of action (whether in contract or
tort) that may be based upon, arise out of or relate to this Agreement or the negotiation, execution or performance of this Agreement (including any claim or cause of action based upon, arising out of or related to any representation or warranty
made in or in connection with this Agreement) will be governed by and construed in accordance with the internal Laws of the State of Delaware applicable to agreements executed and performed entirely within such State. 

Section 3.3 CONSENT TO JURISDICTION AND SERVICE OF PROCESS; WAIVER OF JURY TRIAL. 

(a) Any proceeding or Action based upon, arising out of or related to this Agreement or the transactions contemplated hereby must be brought
in the Court of Chancery of the State of Delaware (or, only to the extent such court does not have subject matter jurisdiction, the Superior Court of the State of Delaware or, if it has or can acquire jurisdiction, in the United States District
Court for the District of Delaware), and each of the parties hereto irrevocably and unconditionally (i) consents and submits to the exclusive jurisdiction of each such court in any such
proceeding or Action, (ii) waives any objection it may now or hereafter have to personal jurisdiction, venue or to convenience of forum, (iii) agrees that all claims in respect of such proceeding or Action shall be heard and determined
only in any such court and (iv) agrees not to bring any proceeding or Action arising out of or relating to this Agreement or the transactions 

  
 8 

 
contemplated hereby in any other court. Nothing herein contained shall be deemed to affect the right of any party to serve process in any manner permitted by Law or to commence Legal Proceedings
or otherwise proceed against any other party in any other jurisdiction, in each case, to enforce judgments obtained in any proceeding or Action brought in accordance with this Section 3.3. Service of process with respect to
any such proceeding or Action may be made upon any party hereto by mailing a copy thereof by registered or certified mail, postage prepaid, to such party at its address as provided in Section 3.8. 

(b) WAIVER OF TRIAL BY JURY. EACH PARTY HERETO HEREBY ACKNOWLEDGES AND AGREES THAT ANY CONTROVERSY WHICH MAY ARISE UNDER THIS
AGREEMENT IS LIKELY TO INVOLVE COMPLICATED AND DIFFICULT ISSUES, AND THEREFORE EACH SUCH PARTY HEREBY IRREVOCABLY AND UNCONDITIONALLY WAIVES ANY RIGHT SUCH PARTY MAY HAVE TO A TRIAL BY JURY IN RESPECT OF ANY LITIGATION DIRECTLY OR INDIRECTLY ARISING
OUT OF OR RELATING TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT. EACH PARTY CERTIFIES AND ACKNOWLEDGES THAT (I) NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH
OTHER PARTY WOULD NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVER, (II) EACH SUCH PARTY UNDERSTANDS AND HAS CONSIDERED THE IMPLICATIONS OF THIS WAIVER, (III) EACH SUCH PARTY MAKES THIS WAIVER VOLUNTARILY AND
(IV) EACH SUCH PARTY HAS BEEN INDUCED TO ENTER INTO THIS AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS SECTION 3.3. 

Section 3.4 Assignment. This Agreement and all of the provisions hereof will be binding upon and inure to the benefit of the
parties hereto and their respective heirs, successors and permitted assigns. Neither this Agreement nor any of the rights, interests or obligations hereunder may be assigned (including by operation of law) without the prior written consent of the
parties hereto. 
 Section 3.5 Specific Performance. The parties hereto agree that irreparable damage could occur in the event
that any of the provisions of this Agreement were not performed in accordance with their specific terms or were otherwise breached. It is accordingly agreed that the parties shall be entitled to an injunction or injunctions to prevent breaches of
this Agreement and to specific enforcement of the terms and provisions of this Agreement, in addition to any other remedy to which any party is entitled at law or in equity. In the event that any Action shall be brought in equity to enforce the
provisions of this Agreement, no party hereto shall allege, and each party hereto hereby waives the defense, that there is an adequate remedy at law, and each party hereto agrees to waive any requirement for the securing or posting of any bond in
connection therewith. 
 Section 3.6 Amendment; Waiver. This Agreement may not be amended or waived, except upon the execution
and delivery of a written agreement executed by Acquiror, the Company and each of the Company Unitholders that are materially adversely affected by such amendment or waiver. 

  
 9 

 Section 3.7 Severability. If any provision of this Agreement is held invalid or
unenforceable by any court of competent jurisdiction, the other provisions of this Agreement will remain in full force and effect. Any provision of this Agreement held invalid or unenforceable only in part or degree will remain in full force and
effect to the extent not held invalid or unenforceable. 
 Section 3.8 Notices. All notices and other communications among the
parties hereto shall be in writing and shall be deemed to have been duly given (a) when delivered in person, (b) when delivered after posting in the United States mail having been sent registered or certified mail return receipt requested,
postage prepaid, (c) when delivered by FedEx or other nationally recognized overnight delivery service or (d) except with respect to notices to be delivered to Control Empresarial de Capitales, S.A. de C.V., when e-mailed during normal business hours of the recipient (and otherwise as of the immediately following Business Day), addressed as follows: 

If to Acquiror: 
 Social
Capital Suvretta Holdings Corp. III 
 2850 W. Horizon Ridge Parkway, Suite 200 

Henderson, NV 89052 
 Attention:
James Ryans, Chief Financial Officer 
 Email: legal@socialcapital.com 

with a copy to (which will not constitute notice): 

Wachtell, Lipton, Rosen & Katz 

51 W. 52nd Street 
 New York, New
York 10019 
 Attention: Raaj S. Narayan 

Email: rsnarayan@wlrk.com 
 If
to the Company: 
 ProKidney GP Limited 

70 Sir John Rogerson’s Quay 

Dublin 2, Ireland 
 Attention: Tim
Bertram, Director 
 Email: Tim.Bertram@prokidney.com 

with a copy to (which will not constitute notice): 

Davis Polk & Wardwell LLP 

450 Lexington Avenue 
 New York,
New York 10017 
 Attention: Richard D. Truesdell Jr., Lee Hochbaum 

Email: richard.truesdell@davispolk.com, lee.hochbaum@davispolk.com 

and 

  
 10 

 Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C. 

555 12th Street NW 
 Suite 1100

 Washington, D.C. 20004 

Attention: Matthew Simpson 

Email: MTSimpson@mintz.com 

If to a Company Unitholder: 

To such Company Unitholder’s address set forth in Schedule I 

with a copy to (which will not constitute notice): 

Davis Polk & Wardwell LLP 

450 Lexington Avenue 
 New York,
New York 10017 
 Attention: Richard D. Truesdell Jr., Lee Hochbaum 

Email: richard.truesdell@davispolk.com, lee.hochbaum@davispolk.com 

and 
 Mintz, Levin, Cohn,
Ferris, Glovsky and Popeo, P.C. 
 555 12th Street NW 

Suite 1100 
 Washington, D.C.
20004 
 Attention: Matthew Simpson 

Email: MTSimpson@mintz.com 

Section 3.9 Counterparts. This Agreement may be executed in two or more counterparts (any of which may be delivered by electronic
transmission), each of which shall constitute an original, and all of which taken together shall constitute one and the same instrument. 

Section 3.10 Several Liability. The liability of any Company Unitholder hereunder is several (and not joint). Notwithstanding any
other provision of this Agreement, in no event will any Company Unitholder be liable for any other Company Unitholder’s breach of such other Company Unitholder’s representations, warranties, covenants, or agreements contained in this
Agreement. 
 Section 3.11 Entire Agreement. This Agreement and the agreements referenced herein constitute the entire agreement
and understanding of the parties hereto in respect of the subject matter hereof and supersede all prior understandings, agreements or representations by or among the parties hereto to the extent they relate in any way to the subject matter hereof.

 [THE REMAINDER OF THIS PAGE IS INTENTIONALLY BLANK] 

  
 11 

 IN WITNESS WHEREOF, the Company Unitholders, Acquiror and the Company have each caused this
Agreement to be duly executed as of the date first written above. 
  

			
	COMPANY UNITHOLDERS:
	
	TOLERANTIA, LLC
		
	By:	 	/s/ Jaime Gomez-Sotomayor
		 	Name: Jaime Gomez-Sotomayor
		 	Title: Authorized Signatory

  

			
	CONTROL EMPRESARIAL DE CAPITALES, S.A. DE C.V.
		
	By:	 	/s/ Armando lbañez Vázquez
		 	 Name: Armando lbañez Vázquez

		 	Title: Attorney-in-fact
	
	PROKIDNEY MANAGEMENT EQUITY LLC
	
	By: Tolerantia, LLC, its manager
	
	By: Nefro Health, its sole member
		
	By:	 	/s/ Jaime Gomez Sotomayor
		 	Name: Jaime Gomez Sotomayor
		 	Title: Authorized Signatory

 [Signature Page to Company Unitholder Support Agreement] 

 
			
	ACQUIROR:
	
	SOCIAL CAPITAL SUVRETTA
	HOLDINGS CORP. III
		
	By:	 	/s/ Chamath Palihapitiya
		 	Name: Chamath Palihapitiya
		 	Title: Chief Executive Officer

 [Signature Page to Company Unitholder Support Agreement] 

 
			
	COMPANY:
	
	 For and on behalf of PROKIDNEY LP

by its general partner, PROKIDNEY GP LIMITED

		
	By:	 	/s/ Jaime Gomez Sotomayor
		 	Name: Jaime Gomez Sotomayor
		 	Title: Director of ProKidney GP Limited

 [Signature Page to Company Unitholder Support Agreement] 

 Exhibit A 

Form of Action by Written Consent of the Unitholders of the Company 

 Schedule I 

Company Unitholder Subject Units 
  

									
	 Holder
	  	 Class A Units
	  	 Class B Units
	  	
Class B-1 Units
	  	 Notice Information

	Tolerantia, LLC	  	111,900,000	  	Nil	  	Nil	  	 110 East 59th Street, Suite 3300
 New
York, NY 10022, United States
 Email: plegorreta@royaltypharma.com

Attention: Pablo Legorreta

					
	Control Empresarial de Capitales, S.A. de C.V.	  	74,600,000	  	Nil	  	Nil	  	 Paseo de las Palmas 781, 3rd floor,

Lomas de Chapultepec III Sección,
 Alcaldía Miguel
Hidalgo, C.P. 11000,
 Mexico City, Mexico
 E-mail: aibanez@incarso.com
 Attention: Armando
Ibáñez-Vázquez
  
 With a
copy to (which shall not constitute notice):
 Paseo de las Palmas 750, 6th floor,

Lomas de Chapultepec,
 Alcaldía Miguel Hidalgo, C.P.
11000,
 Mexico City, Mexico

E-mail: gcaballerop@inbursa.com; and v.ramirez@incarso.com

Attention: Guillermo René Caballero Padilla; and Verónica Ramírez Villela

					
	ProKidney Management Equity LLC	  	Nil	  	7,767,122	  	17,347,389	  	 55 Par La Ville Road, Third Floor

Hamilton HM11, Bermuda

 [Schedule I to Company Unitholder Support Agreement] 

 Annex A 

Form of Joinder Agreement 
 This Joinder
Agreement (this “Joinder Agreement”) is made as of the date written below by the undersigned (the “Joining Party”) in accordance with the Company Unitholder Support Agreement, dated as of January 18, 2022 (as
amended, supplemented or otherwise modified from time to time, the “Support Agreement”), by and among Social Capital Suvretta Holdings Corp. III, a Cayman Islands exempted company limited by shares, ProKidney, LP a limited
partnership organized pursuant to the laws of Ireland, and the Company Unitholders set forth on Schedule I thereto. Capitalized terms used herein and not otherwise defined shall have the meaning ascribed to them in the Support Agreement. 

The Joining Party hereby acknowledges, agrees and confirms that, by its execution of this Joinder Agreement, the Joining Party shall be deemed to be a party
to, and a “Company Unitholder” under, the Support Agreement as of the date hereof and shall have all of the rights and obligations of a Company Unitholder as if it had executed the Support Agreement. The Joining Party hereby ratifies, as
of the date hereof, and agrees to be bound by, all of the terms, provisions and conditions contained in the Support Agreement. 
 IN WITNESS WHEREOF, the
undersigned has duly executed this Joinder Agreement as of the date written below. 
 Date: 

 

			
	By:	 	 
		 	Name:
		 	Title:
	
	Address for Notices:
	
	With copies to:

 [Annex A to Company Unitholder Support Agreement]

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