Document:

EX10-8(b)

 EXHIBIT 10.8(b) 

RELYPSA, INC. 

OPTION GRANT NOTICE 

(2007 EQUITY INCENTIVE PLAN) 

Relypsa, Inc. (the “Company”), pursuant to its 2007 Equity Incentive Plan (the “Plan”),
hereby grants to Optionholder an option to purchase the number of shares of the Company’s Common Stock set forth below. This option is subject to all of the terms and conditions as set forth herein and in the Option Agreement, the Plan and the
Notice of Exercise, all of which are attached hereto and incorporated herein in their entirety. 
  

			
	Optionholder:	  	  

	Date of Grant:	  	  

	Vesting Commencement Date:	  	  

	Number of Shares Subject to Option:	  	  

	Exercise Price (Per Share):	  	  

	Total Exercise Price:	  	  

	Expiration Date:	  	  

  

					
	Type of Grant:	  	 ̈  Incentive Stock Option1	  	  ̈  Nonstatutory Stock Option

			
	Exercise Schedule:	  	 ̈  Same as Vesting Schedule	  	  ̈  Early Exercise Permitted

		
	Vesting Schedule:	  	l/4th of the shares vest one year after the Vesting Commencement Date.
	 	  	l/48th of the shares vest monthly thereafter over the next three years.
		
	 	  	Unless provided otherwise in an agreement between the Company and the Optionholder in effect at such
time, if the Company terminates the Optionholder’ employment without Cause, or the Option
holder
resigns for Good Reason, in either case at any time during the period commencing on the effective date of
a Change in Control and ending twelve (12) months following the effective date of the Change in Control,
and provided the
Optionholder executes and allows to become effective a release of all claims with
respect to the Company in a form satisfactory to the Company, 50% of the then-unvested shares subject
to this Option will become immediately vested and
exercisable.
		
	Payment:	  	By one or a combination of the following items (described in the Option Agreement):
		
	 	  	 ̈    By cash or check
		
	 	  	 ̈    By bank draft or money order payable to the Company
		
		  	 ̈    Pursuant to a Regulation T program if the Shares are publicly traded
		
		  	 ̈    By delivery of already-owned shares if the Shares are publicly traded
		
		  	 ̈    By net exercise if the Company has established a procedure for net exercise at the time of such exercise

 Additional Terms/Acknowledgements: The undersigned Optionholder acknowledges receipt of, and understands and agrees to,
this Stock Option Grant Notice, the Option Agreement and the Plan. Optionholder further acknowledges that as of the Date of Grant, this Stock Option Grant Notice, the Option Agreement and the Plan set forth the entire understanding between
Optionholder and the Company regarding the acquisition of stock in the Company and supersede all prior oral and written agreements on that subject with the exception of (i) options previously granted and delivered to Optionholder under the
Plan, and (ii) the following agreements only: 
  

			
	 OTHER AGREEMENTS:
	 	  

  
  

	1 	If this is an Incentive Stock Option, it (plus other outstanding incentive stock options granted to Optionholder by the Company) cannot be first exercisable for more than $100,000 in value (measured by
exercise price) in any calendar year. Any excess over $100,000 is a Nonstatutory Stock Option. 

			
		 	  

 [Signatures on Following Page] 
  

									
	RELYPSA, INC.	 		  	OPTIONHOLDER:
				
	By:	 	  
	 		  	  

	Signature	 		  	Signature
	Title:	 	  
	 		  	Date:	  	  

					
	Date:	 	  
	 		  		  	

  

	
	ATTACHMENTS: Option Agreement, 2007 Equity Incentive Plan and Notice of Exercise

 RELYPSA, INC. 

2007 EQUITY INCENTIVE PLAN 

OPTION AGREEMENT 

(INCENTIVE STOCK OPTION OR NONSTATUTORY STOCK
OPTION) 
 Pursuant to your Option Grant Notice (“Grant Notice”) and this Option Agreement,
Relypsa, Inc. (the “Company”) has granted you an option under its 2007 Equity Incentive Plan (the “Plan”) to purchase the number of shares of the Company’s Common Stock indicated in your Grant
Notice at the exercise price indicated in your Grant Notice. Defined terms not explicitly defined in this Option Agreement but defined in the Plan shall have the same definitions as in the Plan. 

The details of your option are as follows: 

1. VESTING. Subject to the limitations contained herein, your option will vest as provided in your Grant Notice,
provided that vesting will cease upon the termination of your Continuous Service. 
 2. NUMBER OF
SHARES AND EXERCISE PRICE. The number of shares of Common Stock subject to your option and your exercise price per share referenced in your Grant Notice may be adjusted from time to
time for Capitalization Adjustments. 
 3. EXERCISE PRIOR TO VESTING
(“EARLY EXERCISE”). If permitted in your Grant Notice (i.e., the “Exercise Schedule” indicates that “Early Exercise” of your option is permitted) and subject to the provisions of
your option, you may elect at any time that is both (i) during the period of your Continuous Service and (ii) during the term of your option, to exercise all or part of your option, including the nonvested portion of your option;
provided, however, that: 
 (a) a partial exercise of your option shall be deemed to cover first vested shares of Common Stock
and then the earliest vesting installment of unvested shares of Common Stock; 
 (b) any shares of Common Stock so purchased from
installments that have not vested as of the date of exercise shall be subject to the purchase option in favor of the Company as described in the Company’s form of Early Exercise Stock Purchase Agreement; 

(c) you shall enter into the Company’s form of Early Exercise Stock Purchase Agreement with a vesting schedule that will result in
the same vesting as if no early exercise had occurred; and 
 (d) if your option is an Incentive Stock Option, then, to the extent
that the aggregate Fair Market Value (determined at the time of grant) of the shares of Common Stock with respect to which your option plus all other Incentive Stock Options you hold are exercisable for the first time by you during any calendar year
(under all plans of the Company and its Affiliates) exceeds one hundred thousand dollars ($100,000), your option(s) or portions thereof that exceed such limit (according to the order in which they were granted) shall be treated as Nonstatutory Stock
Options. 

 4. EXERCISE RESTRICTION FOR
NON-EXEMPT EMPLOYEES. In the event that you are an Employee eligible for overtime compensation under the Fair Labor Standards Act of 1938, as amended (i.e., a “Non-Exempt
Employee”), you may not exercise your option until you have completed at least six (6) months of Continuous Service measured from the Date of Grant specified in your Grant Notice, notwithstanding any other provision of your option.

 5. METHOD OF PAYMENT. Payment of the exercise price is due in full upon exercise of
all or any part of your option. You may elect to make payment of the exercise price in cash or by check or in any other manner permitted by your Grant Notice, which may include one or more of the following: 

(a) Bank draft or money order payable to the Company. 

(b) Provided that at the time of exercise the Common Stock is publicly traded and quoted regularly in The Wall Street Journal,
pursuant to a program developed under Regulation T as promulgated by the Federal Reserve Board that, prior to the issuance of Common Stock, results in either the receipt of cash (or check) by the Company or the receipt of irrevocable instructions to
pay the aggregate exercise price to the Company from the sales proceeds. 
 (c) Provided that at the time of exercise the Common
Stock is publicly traded and quoted regularly in The Wall Street Journal, by delivery to the Company (either by actual delivery or attestation) of already-owned shares of Common Stock that are owned free and clear of any liens, claims,
encumbrances or security interests, and that are valued at Fair Market Value on the date of exercise. Notwithstanding the foregoing, you may not exercise your option by tender to the Company of Common Stock to the extent such tender would violate
the provisions of any law, regulation or agreement restricting the redemption of the Company’s stock. 
 (d) By a “net
exercise” arrangement pursuant to which the Company will reduce the number of shares of Common Stock issued upon exercise of your option by the largest whole number of shares with a Fair Market Value that does not exceed the aggregate exercise
price; provided, however, that the Company shall accept a cash or other payment from you to the extent of any remaining balance of the aggregate exercise price not satisfied by such reduction in the number of whole shares to be issued;
provided further, however, that shares of Common Stock will no longer be outstanding under your option and will not be exercisable thereafter to the extent that (1) shares are used to pay the exercise price pursuant to the “net
exercise,” (2) shares are delivered to you as a result of such exercise, and (3) shares are withheld to satisfy tax withholding obligations. 

6. WHOLE SHARES. You may exercise your option only for whole shares of Common Stock. 

7. SECURITIES LAW COMPLIANCE. Notwithstanding anything to the contrary contained herein,
you may not exercise your option unless the shares of Common Stock issuable upon such exercise are then registered under the Securities Act or, if such shares of Common 

 
Stock are not then so registered, the Company has determined that such exercise and issuance would be exempt from the registration requirements of the Securities Act. The exercise of your option
also must comply with other applicable laws and regulations governing your option, and you may not exercise your option if the Company determines that such exercise would not be in material compliance with such laws and regulations. 

8. TERM. You may not exercise your option before the commencement or after the expiration of its term. The term of your
option commences on the Date of Grant and expires upon the earliest of the following: 
 (a) immediately upon the termination of your
Continuous Service for Cause; 
 (b) three (3) months after the termination of your Continuous Service for any reason other than
Cause or your Disability or death; provided, however, that (i) if during any part of such three (3) month period your option is not exercisable solely because of the condition set forth in Section 7, your option shall not
expire until the earlier of the Expiration Date or until it shall have been exercisable for an aggregate period of three (3) months after the termination of your Continuous Service and (ii) if (x) you are a Non-Exempt Employee,
(y) you terminate your Continuous Service within six (6) months after the Date of Grant specified in your Grant Notice, and (z) you have vested in a portion of your option at the time of your termination of Continuous Service, your
option shall not expire until the earlier of (A) the later of the date that is seven (7) months after the Date of Grant specified in your Grant Notice or the date that is three (3) months after the termination of your Continuous
Service or (B) the Expiration Date; 
 (c) twelve (12) months after the termination of your Continuous Service due to your
Disability; 
 (d) eighteen (18) months after your death if you die either during your Continuous Service or within three
(3) months after your Continuous Service terminates for any reason other than Cause; 
 (e) the Expiration Date indicated in
your Grant Notice; or 
 (f) the day before the tenth (10th) anniversary of the Date of Grant. 

If your option is an Incentive Stock Option, note that to obtain the federal income tax advantages associated with an Incentive Stock Option,
the Code requires that at all times beginning on the date of grant of your option and ending on the day three (3) months before the date of your option’s exercise, you must be an employee of the Company or an Affiliate, except in the event
of your death or Disability. The Company has provided for extended exercisability of your option under certain circumstances for your benefit but cannot guarantee that your option will necessarily be treated as an Incentive Stock Option if you
continue to provide services to the Company or an Affiliate as a Consultant or Director after your employment terminates or if you otherwise exercise your option more than three (3) months after the date your employment with the Company or an
Affiliate terminates. 

 9. EXERCISE. 

(a) You may exercise the vested portion of your option (and the unvested portion of your option if your Grant Notice so permits) during
its term by delivering a Notice of Exercise (in a form designated by the Company) together with the exercise price to the Secretary of the Company, or to such other person as the Company may designate, during regular business hours, together with
such additional documents as the Company may then require. 
 (b) By exercising your option you agree that, as a condition to any
exercise of your option, the Company may require you to enter into an arrangement providing for the payment by you to the Company of any tax withholding obligation of the Company arising by reason of (i) the exercise of your option,
(ii) the lapse of any substantial risk of forfeiture to which the shares of Common Stock are subject at the time of exercise, or (iii) the disposition of shares of Common Stock acquired upon such exercise. 

(c) If your option is an Incentive Stock Option, by exercising your option you agree that you will notify the Company in writing within
fifteen (15) days after the date of any disposition of any of the shares of the Common Stock issued upon exercise of your option that occurs within two (2) years after the date of your option grant or within one (1) year after such
shares of Common Stock are transferred upon exercise of your option. 
 (d) By exercising your option you agree that you shall not
sell, dispose of, transfer, make any short sale of, grant any option for the purchase of, or enter into any hedging or similar transaction with the same economic effect as a sale with respect to, any shares of Common Stock or other securities of the
Company held by you, for a period of one hundred eighty (180) days following the effective date of a registration statement of the Company filed under the Securities Act or such longer period as necessary to permit compliance with NASD Rule
2711 and similar or successor regulatory rules and regulations (the “Lock-Up Period”); provided, however, that nothing contained in this section shall prevent the exercise of a repurchase option, if any, in favor of
the Company during the Lock-Up Period. You further agree to execute and deliver such other agreements as may be reasonably requested by the Company and/or the underwriter(s) that are consistent with the foregoing or that are necessary to give
further effect thereto. In order to enforce the foregoing covenant, the Company may impose stop-transfer instructions with respect to your shares of Common Stock until the end of such period. The underwriters of the Company’s stock are intended
third party beneficiaries of this Section 9(d) and shall have the right, power and authority to enforce the provisions hereof as though they were a party hereto. 

10. TRANSFERABILITY. 

(a) Restrictions on Transfer. Your option shall not be transferable except by will or by the laws of descent and distribution and shall
be exercisable during your lifetime only by you; provided, however, that the Board may, in its sole discretion, permit you to transfer your option in a manner consistent with applicable tax and securities laws upon your request. Additionally,
if your option is an Incentive Stock Option, the Board may permit you to transfer your option only to the extent permitted by Sections 421, 422 and 424 of the Code and the regulations and other guidance thereunder. 

 (b) Domestic Relations Orders. Notwithstanding the foregoing, your option may be
transferred pursuant to a domestic relations order; provided, however, that if your option is an Incentive Stock Option, your option shall be deemed to be a Nonstatutory Stock Option as a result of such transfer. 

(c) Beneficiary Designation. Notwithstanding the foregoing, you may, by delivering written notice to the Company, in a form provided by
or otherwise satisfactory to the Company, designate a third party who, in the event of your death, shall thereafter be entitled to exercise your option. 

11. RIGHT OF FIRST REFUSAL. Shares of Common Stock that you acquire upon
exercise of your option are subject to any right of first refusal that may be described in the Company’s bylaws in effect at such time the Company elects to exercise its right; provided, however, that if your option is an Incentive Stock
Option and the right of first refusal described in the Company’s bylaws in effect at the time the Company elects to exercise its right is more beneficial to you than the right of first refusal described in the Company’s bylaws on the Date
of Grant, then the right of first refusal described in the Company’s bylaws on the Date of Grant shall apply. The Company’s right of first refusal shall expire on the Listing Date. For purposes of this Agreement, Listing Date shall mean
the first date upon which any security of the Company is listed (or approved for listing) upon notice of issuance on a national securities exchange or traded on any established market. 

12. RIGHT OF REPURCHASE. To the extent provided in the Company’s bylaws in effect at
such time the Company elects to exercise its right, the Company shall have the right to repurchase all or any part of the shares of Common Stock you acquire pursuant to the exercise of your option. 

13. OPTION NOT A SERVICE CONTRACT. Your option is not an
employment or service contract, and nothing in your option shall be deemed to create in any way whatsoever any obligation on your part to continue in the employ of the Company or an Affiliate, or of the Company or an Affiliate to continue your
employment. In addition, nothing in your option shall obligate the Company or an Affiliate, their respective stockholders, Boards of Directors, Officers or Employees to continue any relationship that you might have as a Director or Consultant for
the Company or an Affiliate. 
 14. WITHHOLDING OBLIGATIONS. 

(a) At the time you exercise your option, in whole or in part, or at any time thereafter as requested by the Company, you hereby
authorize withholding from payroll and any other amounts payable to you, and otherwise agree to make adequate provision for (including by means of a “cashless exercise” pursuant to a program developed under Regulation T as promulgated by
the Federal Reserve Board to the extent permitted by the Company), any sums required to satisfy the federal, state, local and foreign tax withholding obligations of the Company or an Affiliate, if any, which arise in connection with the exercise of
your option. 
 (b) Upon your request and subject to approval by the Company, in its sole discretion, and compliance with any
applicable legal conditions or restrictions, the Company 

 
may withhold from fully vested shares of Common Stock otherwise issuable to you upon the exercise of your option a number of whole shares of Common Stock having a Fair Market Value, determined by
the Company as of the date of exercise, not in excess of the minimum amount of tax required to be withheld by law (or such lower amount as may be necessary to avoid variable award accounting). If the date of determination of any tax withholding
obligation is deferred to a date later than the date of exercise of your option, share withholding pursuant to the preceding sentence shall not be permitted unless you make a proper and timely election under Section 83(b) of the Code, covering
the aggregate number of shares of Common Stock acquired upon such exercise with respect to which such determination is otherwise deferred, to accelerate the determination of such tax withholding obligation to the date of exercise of your option.
Notwithstanding the filing of such election, shares of Common Stock shall be withheld solely from fully vested shares of Common Stock determined as of the date of exercise of your option that are otherwise issuable to you upon such exercise. Any
adverse consequences to you arising in connection with such share withholding procedure shall be your sole responsibility. 
 (c) You
may not exercise your option unless the tax withholding obligations of the Company and/or any Affiliate are satisfied. Accordingly, you may not be able to exercise your option when desired even though your option is vested, and the Company shall
have no obligation to issue a certificate for such shares of Common Stock or release such shares of Common Stock from any escrow provided for herein unless such obligations are satisfied. 

15. NOTICES. Any notices provided for in your option or the Plan shall be given in writing and shall be deemed
effectively given upon receipt or, in the case of notices delivered by mail by the Company to you, five (5) days after deposit in the United States mail, postage prepaid, addressed to you at the last address you provided to the Company. 

16. GOVERNING PLAN DOCUMENT. Your option is subject to all the provisions of the Plan, the
provisions of which are hereby made a part of your option, and is further subject to all interpretations, amendments, rules and regulations, which may from time to time be promulgated and adopted pursuant to the Plan. In the event of any conflict
between the provisions of your option and those of the Plan, the provisions of the Plan shall control.EX-10.8(c)

 EXHIBIT 10.8(c) 

RELYPSA, INC. 

RESTRICTED STOCK PURCHASE 

GRANT NOTICE 

(2007 EQUITY INCENTIVE PLAN) 

RELYPSA, INC. (the “Company”), pursuant
to its 2007 Equity Incentive Plan (the “Plan”), hereby grants to Participant the right to purchase the number of shares of the Company’s Common Stock set forth below
(“Award”). This Award is subject to all of the terms and conditions as set forth herein and in the Restricted Stock Purchase Agreement, the Plan, the form of Assignment Separate from Certificate
and the form of Joint Escrow Instructions, all of which are attached hereto and incorporated herein in their entirety. 
  

					
	 Participant:
	  	  
	  	
	 Date of Grant:
	  	  
	  	
	 Vesting Commencement Date:
	  	  
	  	
	 Number of Shares Subject to Award:
	  	  
	  	
	 Purchase Price per Share:
	  	  
	  	
	 Total Purchase Price:
	  	  
	  	
	 Closing Date:
	  	  
	  	

  

			
	Vesting Schedule:	  	 l/4th of the shares vest one year after the Vesting Commencement Date.

 
 l/48th of the shares vest monthly
thereafter over the next three years.

 As more fully provided in Purchaser’s Restricted Stock Purchase Agreement, 100% of unvested shares shall
vest if within 12 months following a Change in Control (as defined in the Plan), the Company terminates Participant’s employment without Cause (as defined in the Plan) or Participant terminates his or her employment for Good Reason (as defined
in the Plan). 
  

			
	Payment:	  	By one or a combination of the following items (described in the Restricted Stock Purchase Agreement):
		
		  	        By cash or check

 Additional Terms/Acknowledgements: The undersigned Participant acknowledges receipt of, and understands and agrees to,
this Grant Notice, the Restricted Stock Purchase Agreement and the Plan. Participant further acknowledges that as of the Date of Grant, this Grant Notice, the Restricted Stock Purchase Agreement and the Plan set forth the entire understanding
between Participant and the Company regarding the acquisition of stock in the Company and supersede all prior oral and written agreements on that subject with the exception of (i) Awards previously granted and delivered to Participant under the
Plan, and (ii) the following agreements only: 
  

							
		 	 OTHER AGREEMENTS:
	 	  

		 		 	  

 [Signatures on Following Page] 

									
	 RELYPSA, INC.
	 		 	PARTICIPANT:
				
	 By:
	 	  
	 		 	  

	Signature	 		 	Signature
					
	 Title:
	 		 		 	Date:	 	
					
	 Date:
	 		 		 		 	

  

			
	 ATTACHMENTS:
	  	Restricted Stock Purchase Agreement, 2007 Equity Incentive Plan, form of Assignment Separate from Certificate and form of Joint Escrow Instructions

 RELYPSA, INC. 

RESTRICTED STOCK PURCHASE AGREEMENT 

THIS RESTRICTED STOCK PURCHASE AGREEMENT (the
“Agreement”) is made as of the      day of August, 2007, by and between RELYPSA, INC., a Delaware corporation (the “Company”),
and                     (“Purchaser”). 

WHEREAS, the Company desires to issue, and Purchaser desires to acquire, stock of the Company as herein
described, on the terms and conditions hereinafter set forth. 
 Now, THEREFORE, IT IS
AGREED between the parties as follows: 
 1. PURCHASE AND SALE
OF STOCK. Purchaser hereby agrees to purchase from the Company, and the Company hereby agrees to sell to Purchaser, an aggregate of      shares of the Common Stock of the Company (the
“Stock”) at $0.001 per share, for an aggregate purchase price of $        , payable in cash. 

The closing hereunder, including payment for and delivery of the Stock shall occur at the offices of the Company immediately following the
execution of this Agreement, or at such other time and place as the parties may mutually agree. 
 This Agreement is subject to all of the
terms and conditions as set forth in the Company’s 2007 Equity Incentive Plan (the “Plan”) regarding the purchase and sale of restricted stock. If there is a conflict between the terms of this Agreement and the terms of
the Plan, the terms of the Plan shall control. 
  

	2.	REPURCHASE RIGHT 

 (a) In the event Purchaser’s
relationship with the Company (or a parent or subsidiary of the Company) terminates for any reason (including death or disability), or for no reason, with or without cause, such that after such termination Purchaser is no longer an employee of, or
consultant to, the Company, then the Company shall simultaneously with termination of Purchaser’s relationship with the Company, automatically repurchase (the “Repurchase Right”), from Purchaser or
Purchaser’s personal representative, as the case may be, at a price that is the lower of (i) the original price per share indicated above paid by Purchaser for such Stock or (ii) the Fair Market Value (as defined below) per share of
such Stock as of the date of such repurchase (“Repurchase Price”), up to but not exceeding the number of shares of Stock that have not vested in accordance with the provisions of Section 2(b) below as of such termination
date (the “Unreleased Stock”), unless the Company agrees to waive its Repurchase Right as to some or all of the shares of Stock that have not vested. For purposes of the Repurchase Right, the “Fair Market
Value” shall mean the value of the Stock as determined in good faith by the Company’s Board of Directors. Except as limited by applicable law, the Company may exercise its Repurchase Right as to any or all of Unreleased Stock at
any time following Purchaser’s termination; provided, however, that without requirement of further action on the part of either 

  
 1. 

 
party hereto, the Company’s Repurchase Right shall be deemed to have been automatically exercised as to all Unreleased Stock at 5:00 p.m. PST on the date that is 60 days following the date
of Purchaser’s termination, unless the Company declines in writing to exercise its Repurchase Right prior to such time; and provided, further, that notwithstanding the above, the Company’s Repurchase Right shall not be deemed to have been
automatically exercised, and shall instead be deemed to be terminated as of such time and date, in any case where such automatic exercise would result in a violation of applicable law by reason of the Company having insufficient assets to meet its
obligations or otherwise, including, without limitation, a violation of any provision of Sections 500 through 505 of the California Corporations Code and Section 160 of the Delaware General Corporation Law. Purchaser hereby acknowledges that
the Company has no obligation, either now or in the future, to repurchase any of the shares of Common Stock, whether vested or unvested, at any time. Further, Purchaser acknowledges and understands that, in the event that the Company repurchases
shares, the repurchase price may be less than the price Purchaser originally paid and that Purchaser bears any risk associated with the potential loss in value. 

(b) One hundred percent (100%) of the Stock shall initially be subject to the Repurchase Right. On the date one (1) year from
the Vesting Commencement Date (as set forth on the signature page to this Agreement) twenty-five percent (25%) (      shares) of the Stock subject to the Repurchase Right shall vest and be released from the Repurchase Right.
Thereafter, l/48th of the Stock shall vest and be released from the Repurchase Right on a monthly basis until all the Stock is released from the Repurchase Right (provided in each case that
Purchaser remains an employee of, or a consultant to, the Company (or a parent or subsidiary of the Company) as of the date of such release). Except as otherwise set forth herein, the Repurchase Right will expire on the fourth anniversary of the
Vesting Commencement Date. 
 (c) If within 12 months following a Change in Control (as defined in the Plan), the Company terminates
Purchaser’s employment without Cause (as defined in the Plan) or Purchaser terminates his or her employment for Good Reason (as defined in the Plan), then subject to Section 18(i), the Repurchase Right shall lapse and all shares of Stock
subject to Repurchase Right shall immediately become fully vested. 
 3. WAIVER OF REPURCHASE
RIGHT. Any waiver of the Company’s Repurchase Right shall be exercised by the Company pursuant to written notice to the Escrow Agent (as defined below) (with a copy to Purchaser or Purchasers’ representative) delivered
simultaneous with the Company’s written notice to the Escrow Agent of Purchaser’s termination of his relationship with the Company and, upon receipt of any such waiver, the Escrow Agent may then release to Purchaser the number of unvested
shares of Stock not being repurchased by the Company. If the Company does not waive its Repurchase Right as to all of the unvested shares of Stock, then upon (i) payment of the Repurchase Price for the shares of Stock purchased pursuant to the
Company’s Repurchase Right and (ii) receipt of the Company’s written notice of Purchaser’s termination of his relationship with the Company, the Escrow Agent automatically shall transfer to the Company the number of shares of
Stock the Company is repurchasing. The Company shall be entitled to pay for any shares of Stock purchased pursuant to its Repurchase Right at the Company’s option in cash or by offset against any indebtedness owing to the Company by Purchaser
(including without limitation any Note given in payment for the Stock), or by a combination of both. Upon delivery of such notice and payment of the Repurchase Price in any 

  
 2. 

 
of the ways described above, the Company shall become the legal and beneficial owner of the Stock being repurchased and all rights and interest therein or related thereto, and the Company shall
have the right to transfer to its own name the Stock being repurchased by the Company, without further action by Purchaser. 
 4.
ADJUSTMENTS TO STOCK. If, from time to time, during the term of the Repurchase Right there is any change affecting the Company’s outstanding Common Stock as a class that is effected without the
receipt of consideration by the Company (through merger, consolidation, reorganization, reincorporation, stock dividend, dividend in property other than cash, stock split, liquidating dividend, combination of shares, change in corporation structure
or other transaction not involving the receipt of consideration by the Company), then any and all new, substituted or additional securities to which Purchaser is entitled by reason of Purchaser’s ownership of Stock shall be immediately subject
to the Repurchase Right and be included in the word “Stock” for all purposes of the Repurchase Right with the same force and effect as the shares of the Stock presently subject to the Repurchase Right, but only
to the extent the Stock is, at the time, subject to the Repurchase Right, and provided that the Repurchase Right is not expired. While the total Repurchase Price shall remain the same after each such event, the Repurchase Price per share of Stock
upon exercise of the Repurchase Right shall be appropriately adjusted. 
 5. CORPORATE TRANSACTION. In the event of a
Corporate Transaction (as defined in the Plan), appropriate adjustments shall be made to the Repurchase Price per share payable upon exercise of the Repurchase Right to reflect the effect of the Corporate Transaction upon the Company’s capital
structure; provided, however, that the aggregate Repurchase Price shall remain the same. 
 6. TERMINATION OF
REPURCHASE RIGHT. Sections 2, 3, 4 and 5 of this Agreement shall terminate upon the exercise in full or expiration of the Repurchase Right, whichever occurs first. 

7. ESCROW OF UNVESTED STOCK. As security for Purchaser’s faithful performance of the
terms of this Agreement and to insure the availability for delivery of Purchaser’s Stock upon exercise of the Repurchase Right herein provided for, Purchaser agrees, at the closing hereunder, to deliver to and deposit with the Secretary of the
Company or the Secretary’s designee (“Escrow Agent”), as Escrow Agent in this transaction, three (3) stock assignments duly endorsed (with date and number of shares blank) in the form attached hereto as
Exhibit A, together with a certificate or certificates evidencing all of the Stock subject to the Repurchase Right; said documents are to be held by the Escrow Agent and delivered by said Escrow Agent pursuant to the
Joint Escrow Instructions of the Company and Purchaser set forth in Exhibit B attached hereto and incorporated by this reference, which instructions shall also be delivered to the Escrow Agent at the closing hereunder.
Purchaser hereby acknowledges that the Secretary of the Company, or the Secretary’s designee, is so appointed as the escrow holder with the foregoing authorities as a material inducement to make this Agreement and that said appointment is
coupled with an interest and is accordingly irrevocable. Purchaser agrees that Escrow Agent shall not be liable to any party hereof (or to any other party). Escrow Agent may rely upon any letter, notice or other document executed by any signature
purported to be genuine and may resign at any time. Purchaser agrees that if the Secretary of the Company, or the Secretary’s designee, resigns as Escrow Agent for any or no reason, the Board of Directors of the Company shall have the power to
appoint a successor to serve as Escrow Agent pursuant to the terms of 

  
 3. 

 
this Agreement. Purchaser agrees that if the Secretary of the Company resigns as Secretary, the successor Secretary shall serve as Escrow Agent pursuant to the terms of this Agreement. 

8. PARACHUTE PAYMENTS. 

(a) If any payment or benefit Purchaser would receive pursuant to a Corporate Transaction from the Company or otherwise
(“Payment”) would (i) constitute a “parachute payment” within the meaning of Section 280G of the Internal Revenue Code of 1986, as amended (the “Code”),
and (ii) but for this sentence, be subject to the excise tax imposed by Section 4999 of the Code (the “Excise Tax”), then such Payment shall be reduced to the Reduced Amount. The “Reduced
Amount” shall be either (x) the largest portion of the Payment that would result in no portion of the Payment being subject to the Excise Tax or (y) the largest portion, up to and including the total, of the
Payment, whichever amount, after taking into account all applicable federal, state and local employment taxes, income taxes, and the Excise Tax (all computed at the highest applicable marginal rate), results in Purchaser’s receipt, on an
after-tax basis, of the greater amount of the Payment notwithstanding that all or some portion of the Payment may be subject to the Excise Tax. If a reduction in payments or benefits constituting “parachute
payments” is necessary so that the Payment equals the Reduced Amount, reduction shall occur in the following order unless Purchaser elects in writing a different order (provided, however, that such election shall be
subject to Company approval if made on or after the date on which the event that triggers the Payment occurs): reduction of cash payments; cancellation of accelerated vesting of stock awards; reduction of employee benefits. In the event that
acceleration of vesting of stock award compensation is to be reduced, such acceleration of vesting shall be cancelled in the reverse order of the date of grant of Purchaser’s stock awards unless Purchaser elects in writing a different order for
cancellation. 
 (b) The accounting firm engaged by the Company for general audit purposes as of the day prior to the effective date
of the Corporate Transaction shall perform the foregoing calculations. If the accounting firm so engaged by the Company is serving as accountant or auditor for the individual, entity or group effecting the Corporate Transaction, the Company shall
appoint a nationally recognized accounting firm to make the determinations required hereunder. The Company shall bear all expenses with respect to the determinations by such accounting firm required to be made hereunder. 

(c) The accounting firm engaged to make the determinations hereunder shall provide its calculations, together with detailed supporting
documentation, to the Company and Purchaser within fifteen (15) calendar days after the date on which Purchaser’s right to a Payment is triggered (if requested at that time by the Company or Purchaser) or such other time as requested by
the Company or Purchaser. If the accounting firm determines that no Excise Tax is payable with respect to a Payment, it shall furnish the Company and Purchaser with an opinion reasonably acceptable to Purchaser that no Excise Tax will be imposed
with respect to such Payment. Any good faith determinations of the accounting firm made hereunder shall be final, binding and conclusive upon the Company and Purchaser. 

9. RIGHTS OF PURCHASER. Subject to the provisions of Sections 7, 10, 13 and 15 herein, Purchaser shall
exercise all rights and privileges of a shareholder of the Company with respect to the Stock deposited in escrow. Purchaser shall be deemed to be the holder for purposes of 

  
 4. 

 receiving any dividends that may be paid with respect to such shares of Stock and for the purpose of exercising
any voting rights relating to such shares of Stock, even if some or all of such shares of Stock have not yet vested and been released from the Repurchase Right. 

10. LIMITATIONS ON TRANSFER. In addition to any other limitation on transfer created by applicable
securities laws, Purchaser shall not assign, hypothecate, donate, encumber or otherwise dispose of any interest in the Stock while the Stock is subject to the Repurchase Right. After any Stock has been released from the Repurchase Right, Purchaser
shall not assign, hypothecate, donate, encumber or otherwise dispose of any interest in the Stock except in compliance with the provisions herein and applicable securities laws. Notwithstanding the provision, no such restriction shall apply to a
transfer by the Purchaser to a Purchaser’s family member or trust for the benefit of the Purchaser; provided that in each case the Purchaser provides written notice of any such transfer to the Company and transferee will
agree in writing to be subject to the terms of this Agreement to the same extent as if he were an original Purchaser hereunder. Furthermore, the Stock shall be subject to any right of first refusal in favor of the Company or its assignees that may
be contained in the Company’s Bylaws. Purchaser hereby further acknowledges that Purchaser may be required to hold the Common Stock purchased hereunder indefinitely. During the period of time during which the Purchaser holds the Common
Stock, the value of the Common Stock may increase or decrease, and any risk associated with such Common Stock and such fluctuation in value shall be borne by the Purchaser. 

11. RESTRICTIVE LEGENDS. All certificates representing the Stock shall have endorsed thereon legends in substantially the
following forms (in addition to any other legend which may be required by other agreements between the parties hereto): 
 (a)
“THE SHARES REPRESENTED BY THIS CERTIFICATE MAY BE SUBJECT TO A REPURCHASE RIGHT SET FORTH IN AN AGREEMENT BETWEEN THE COMPANY AND THE REGISTERED HOLDER, OR SUCH HOLDER’S PREDECESSOR IN INTEREST, A COPY OF WHICH IS ON FILE AT THE PRINCIPAL
OFFICE OF THE COMPANY.” 
 (b) “THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE SECURITIES
ACT OF 1933 AS AMENDED. THEY MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED OR HYPOTHECATED IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT AS TO THE SECURITIES UNDER SAID ACT OR AN OPINION OF COUNSEL SATISFACTORY TO THE COMPANY THAT SUCH
REGISTRATION IS NOT REQUIRED.” 
 (c) “THE SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO A RIGHT OF FIRST REFUSAL
OPTION IN FAVOR OF THE COMPANY AND/OR ITS ASSIGNEE(S) AS PROVIDED IN THE BYLAWS OF THE COMPANY.” 
 (d) Any legend required by
appropriate blue sky officials. 

  
 5. 

 12. INVESTMENT REPRESENTATIONS. In connection with the purchase of the
Stock, Purchaser represents to the Company the following: 
 (a) Purchaser is aware of the Company’s business affairs and
financial condition and has acquired sufficient information about the Company to reach an informed and knowledgeable decision to acquire the Stock. Purchaser is purchasing the Stock for investment for Purchaser’s own account only and not with a
view to, or for resale in connection with, any “distribution” thereof within the meaning of the Securities Act of 1933, as amended (the “Act”). 

(b) Purchaser understands that the Stock has not been registered under the Act by reason of a specific exemption therefrom, which
exemption depends upon, among other things, the bona fide nature of Purchaser’s investment intent as expressed herein. 
 (c)
Purchaser further acknowledges and understands that the Stock must be held indefinitely unless the Stock is subsequently registered under the Act or an exemption from such registration is available. Purchaser further acknowledges and
understands that the Company is under no obligation to register the Stock. Purchaser understands that the certificate evidencing the Stock will be imprinted with a legend which prohibits the transfer of the Stock unless the Stock is registered or
such registration is not required in the opinion of counsel for the Company. 
 (d) Purchaser is familiar with the provisions of
Rules 144 and 701, under the Act, as in effect from time to time, which, in substance, permit limited public resale of “restricted securities” acquired, directly or indirectly, from the issuer thereof (or from
an affiliate of such issuer), in a non-public offering subject to the satisfaction of certain conditions. 
 Rule 701 provides that if the
issuer qualifies under Rule 701 at the time of issuance of the securities, such issuance will be exempt from registration under the Act. In the event the Company becomes subject to the reporting requirements of Section 13 or 15(d) of the
Securities Exchange Act of 1934, the securities exempt under Rule 701 may be sold by Purchaser ninety (90) days thereafter, subject to the satisfaction of certain of the conditions specified by Rule 144 and the market stand-off provision
described in Section 13 below. 
 In the event the sale of the Stock does not qualify under Rule 701 at the time of the purchase then
the Stock may be resold by Purchaser in certain limited circumstances subject to the provisions of Rule 144, which requires, among other things: (i) the availability of certain public information about the Company and (ii) the resale
occurring following the required holding period under Rule 144 after the Purchaser has purchased, and made full payment of (within the meaning of Rule 144), the securities to be sold. 

(e) Purchaser further understands that at the time Purchaser wishes to sell the Stock there may be no public market upon which to make
such a sale, and that, even if such a public market then exists, the Company may not be satisfying the current public information requirements of Rule 144 or 701, and that, in such event, Purchaser would be precluded from selling the Stock under
Rule 144 or 701 even if the minimum holding period requirement had been satisfied. 
 (f) Purchaser represents that Purchaser is an
“accredited investor” as that term is defined in Rule 501 of Regulation D promulgated by the Securities and Exchange Commission under the Securities Act of 1933, as amended. 

  
 6. 

 (g) Purchaser further warrants and represents that Purchaser has either
(i) preexisting personal or business relationships, with the Company or any of its officers, directors or controlling persons, or (ii) the capacity to protect his own interests in connection with the purchase of the Stock by virtue of the
business or financial expertise of himself or of professional advisors to Purchaser who are unaffiliated with and who are not compensated by the Company or any of its affiliates, directly or indirectly. 

13. MARKET STAND-OFF AGREEMENT. Purchaser shall not sell, dispose of, transfer, make any
short sale of, grant any option for the purchase of, or enter into any hedging or similar transaction with the same economic effect as a sale, any Common Stock or other securities of the Company held by Purchaser, including the Stock (the
“Restricted Securities”), during the 180- day period following the effective date of a registration statement of the Company filed under the Act (the “Lock Up
Period”); (or such longer period, not to exceed 18 days after the expiration of the 180-day period, as the underwriters or the Company shall request in order to facilitate compliance with NASD Rule 2711), provided,
however, that nothing contained in this Section 13 shall prevent the exercise of the Repurchase Right during the Lock Up Period. Purchaser agrees to execute and deliver such other agreements as may be reasonably requested by the Company
and/or the managing underwriter which are consistent with the foregoing or which are necessary to give further effect thereto. In order to enforce the foregoing covenant, the Company may impose stop-transfer instructions with respect to
Purchaser’s Restricted Securities until the end of such period. The underwriters of the Company’s stock are intended third party beneficiaries of this Section 13 and shall have the right, power and authority to enforce the provisions
hereof as though they were a party hereto. 
 14. SECTION 83(B) ELECTION. Purchaser understands that
Section 83(a) of the Internal Revenue Code of 1986, as amended (the “Code”), taxes as ordinary income the difference between the amount paid for the Stock and the fair market value of the Stock as of
the date any restrictions on the Stock lapse. In this context, “restriction” includes the right of the Company to buy back the Stock pursuant to the Repurchase Right set forth in Section 2 above. Purchaser
understands that Purchaser may elect to be taxed at the time the Stock is purchased, rather than when and as the Repurchase Right expires, by filing an election under Section 83(b) (an “83(b)
Election”) of the Code with the Internal Revenue Service within thirty (30) days from the date of purchase. Even if the fair market value of the Stock at the time of the execution of this Agreement equals the
amount paid for the Stock, the 83(b) Election must be made to avoid income under Section 83(a) in the future. Purchaser understands that failure to file such an 83(b) Election in a timely manner may result in adverse tax consequences for
Purchaser. Purchaser further understands that an additional copy of such 83(b) Election is required to be filed with his or her federal income tax return for the calendar year in which the date of this Agreement falls. Purchaser further
acknowledges and understands that it is Purchaser’s sole obligation and responsibility to timely file such 83(b) Election, and neither the Company nor the Company’s legal or financial advisors shall have any obligation or
responsibility with respect to such filing. Purchaser acknowledges that the foregoing is only a summary of the effect of United States federal income taxation with respect to purchase of the Stock hereunder, and does not purport to be complete.
Purchaser further acknowledges that the Company has directed Purchaser to seek independent advice regarding the applicable provisions of the Code, the income tax laws of any municipality, state or foreign country in which Purchaser may reside, and
the tax consequences of Purchaser’s death. Purchaser assumes all responsibility for filing an 83(b) Election and paying all taxes resulting from such election or the lapse of the restrictions on the Stock. 

  
 7. 

 15. REFUSAL TO TRANSFER. The Company
shall not be required (a) to transfer on its books any shares of Stock of the Company which shall have been transferred in violation of any of the provisions set forth in this Agreement or (b) to treat as owner of such shares or to accord
the right to vote as such owner or to pay dividends to any transferee to whom such shares shall have been so transferred. 
 16. NO
EMPLOYMENT RIGHTS. This Agreement is not an employment contract and nothing in this Agreement shall affect in any manner whatsoever the right or power of the Company (or a parent or subsidiary of the Company) to
terminate Purchaser’s employment for any reason at any time, with or without cause and with or without notice. 
 17. INTELLECTUAL
PROPERTY RIGHTS. 
 (a) Purchaser represents and warrants that except for intellectual property
rights assigned pursuant to this Agreement or specifically disclosed to the Company on the appropriate schedule of Purchaser’s Proprietary Information and Inventions Agreement with the Company, Purchaser possesses no intellectual property and
has made no inventions related to the Company’s business, as currently conducted or as proposed to be conducted. Purchaser further agrees that to the extent it is discovered that Purchaser has made inventions, patented or unpatented, or
otherwise possesses intellectual property rights related to the Company’s business that were not properly assigned to the Company or specifically disclosed and excluded in Purchaser’s Proprietary Information and Inventions Agreement (the
“Additional Intellectual Property”), that the Additional Intellectual Property is hereby assigned to the Company. 

(b) Purchaser agrees to assist the Company in every proper way to obtain, and from time to time enforce, United States and foreign
proprietary rights relating to the Additional Intellectual Property in any and all countries. Purchaser agrees to execute, verify and deliver such documents and perform such other acts (including appearances as a witness) as the Company may
reasonably request for use in applying for, obtaining, perfecting, evidencing, sustaining and enforcing such Additional Intellectual Property and the assignment thereof. 

(c) In the event the Company is unable for any reason, after reasonable effort, to secure Purchaser’s signature on any document
needed in connection with the actions specified in the preceding paragraph, -Purchaser hereby irrevocably designate and appoint the Company and its duly authorized officers and agents as my agent
and attorney in fact, which appointment is coupled with an interest, to act for and on behalf of Purchaser to execute, verify and file any such documents and to do all other lawfully permitted acts to further the purposes of the preceding paragraph
with the same legal force and effect as if executed by Purchaser. 
 18. MISCELLANEOUS. 

(a) Notices. All notices required or permitted hereunder shall be in writing and shall be deemed effectively given: (i) upon
personal delivery to the party to be notified, (ii) when sent by confirmed telex or facsimile if sent during normal business hours of the recipient, and if not during normal business hours of the recipient, then on the next business day,
(iii) five (5) 

  
 8. 

 
calendar days after having been sent by registered or certified mail, return receipt requested, postage prepaid, or (iv) one (1) business day after deposit with a nationally recognized
overnight courier, specifying next day delivery, with written verification of receipt. All communications shall be sent to the other party hereto at such party’s address hereinafter set forth on the signature page hereof, or at such other
address as such party may designate by ten (10) days advance written notice to the other party hereto. 
 (b) Successors and
Assigns. This Agreement shall inure to the benefit of the successors and assigns of the Company and, subject to the restrictions on transfer herein set forth, be binding upon Purchaser, Purchaser’s successors, and assigns. The Repurchase
Right of the Company hereunder shall be assignable by the Company at any time or from time to time, in whole or in part. 
 (c)
Attorneys’ Fees; Specific Performance. Company shall be entitled to seek all reasonable costs incurred by the Company in enforcing the performance of, or protecting its rights under, any part of this Agreement in connection with the
material breach of the Agreement by Purchaser,. It is the intention of the parties that the Company, upon exercise of the Repurchase Right and payment therefor, pursuant to the terms of this Agreement, shall be entitled to receive the Stock, in
specie, in order to have such Stock available for future issuance without dilution of the holdings of other shareholders. . 
 (d)
Governing Law; Venue. This Agreement shall be governed by and construed in accordance with the laws of the State of California. The parties agree that any action brought by either party to interpret or enforce any provision of this Agreement
shall be brought in, and each party agrees to, and does hereby, submit to the jurisdiction and venue of, the appropriate state or federal court for the district encompassing the Company’s principal place of business. 

(e) Further Execution. The parties agree to take all such further action (s) as may reasonably be necessary to carry out and
consummate this Agreement as soon as practicable, and to take whatever steps may be necessary to obtain any governmental approval in connection with or otherwise qualify the issuance of the securities that are the subject of this Agreement.

 (f) Independent Counsel. Purchaser acknowledges that this Agreement has been prepared on behalf of the Company by
Cooley Godward Kronish LLP, counsel to the Company and that Cooley Godward Kronish LLP does not represent, and is not acting on behalf of, Purchaser. Purchaser has been provided with an opportunity to consult with Purchaser’s own counsel with
respect to this Agreement. 
 (g) Entire Agreement; Amendment. This Agreement constitutes the entire agreement between the parties
with respect to the subject matter hereof and supersedes and merges all prior agreements or understandings, whether written or oral. This Agreement may not be amended, modified or revoked, in whole or in part, except by an agreement in writing
signed by each of the parties hereto. 
 (h) Severability. If one or more provisions of this Agreement are held to be
unenforceable under applicable law, the parties agree to renegotiate such provision in good faith. In the event that the parties cannot reach a mutually agreeable and enforceable replacement for 

  
 9. 

 such provision, then (i) such provision shall be excluded from this Agreement, (ii) the balance of the
Agreement shall be interpreted as if such provision were so excluded and (iii) the balance of the Agreement shall be enforceable in accordance with its terms. 

(i) Release. As a condition of receiving the benefits under Section 2(c) of this Agreement to which Purchaser would not
otherwise be entitled, Purchaser shall deliver to the Company a release in the form attached hereto as Exhibit C (the “Release”) and such release shall have become effective
pursuant to its terms. Unless the Release is executed by Purchaser and delivered to the Company within twenty-one (21) days after the termination of Purchaser’s relationship with the Company, Purchaser shall not receive any of the
accelerated vesting benefits provided for under this Agreement. 
 (j) Counterparts; Facsimile. This Agreement may be executed
in two or more counterparts, each of which shall be deemed an original and all of which together shall constitute one instrument. Facsimile signatures shall be as effective as original signatures. 

  
 10. 

 IN WITNESS WHEREOF, the
parties hereto have executed this Agreement as of the day and year first above written. 
  

			
	 RELYPSA, INC.

		
	By:	 	  

	Title:	 	

 
			
		
	Address:	 	

 PURCHASER ACKNOWLEDGES AND AGREES THAT
THE VESTING OF SHARES PURSUANT TO SECTION 2 HEREOF IS EARNED ONLY BY
CONTINUING SERVICE AS AN EMPLOYEE OR CONSULTANT AT THE WILL OF THE
COMPANY. PURCHASER ACKNOWLEDGES AND AGREES THAT NOTHING IN THIS AGREEMENT SHALL
CONFER UPON PURCHASER ANY RIGHT WITH RESPECT TO CONTINUATION OF A RELATIONSHIP
WITH THE COMPANY, NOR SHALL IT INTERFERE IN ANY WAY WITH
PURCHASER’S RIGHT OR THE COMPANY’S RIGHT TO TERMINATE
PURCHASER’S EMPLOYMENT OR CONSULTING RELATIONSHIP AT ANY TIME, WITH OR
WITHOUT CAUSE. 
 PURCHASER ACKNOWLEDGES AND AGREES
THAT PURCHASER MAY BE REQUIRED TO HOLD THE COMMON STOCK PURCHASED
HEREUNDER INDEFINITELY, AND THAT THE COMPANY HAS NO OBLIGATION TO REPURCHASE
SUCH SHARES. PURCHASER FURTHER ACKNOWLEDGES THAT ANY RISK RELATED TO THE
FLUCTUATION IN THE VALUE OF THE STOCK FROM AND AFTER THE DATE
HEREOF, INCLUDING ANY LOSSES TO PURCHASER AS A RESULT OF
COMPANY’S EXERCISE OF ITS REPURCHASE RIGHT PURSUANT TO SECTION 2, SHALL
BE BORNE BY PURCHASER. 
 PURCHASER ACKNOWLEDGES
THAT PURCHASER HAS READ ALL TAX RELATED SECTIONS AND FURTHER ACKNOWLEDGES
PURCHASER HAS HAD AN OPPORTUNITY TO CONSULT PURCHASER’S OWN TAX,
LEGAL AND FINANCIAL ADVISORS REGARDING THE PURCHASE OF COMMON STOCK UNDER
THIS AGREEMENT. 
 PURCHASER ACKNOWLEDGES AND AGREES
THAT IN MAKING THE DECISION TO PURCHASE THE COMMON STOCK HEREUNDER
PURCHASER HAS NOT RELIED ON ANY STATEMENT, WHETHER WRITTEN OR ORAL,
REGARDING THE SUBJECT MATTER HEREOF, EXCEPT AS EXPRESSLY PROVIDED HEREIN AND
IN THE ATTACHMENTS AND EXHIBITS HERETO. 
  

			
	 PURCHASER:

	
	  

	[NAME]	 	
		
	Address:	 	
	

  

							
		 	VESTING COMMENCEMENT DATE:	 		 	

  
 11. 

 EXHIBIT A 

STOCK ASSIGNMENT SEPARATE FROM CERTIFICATE 

FOR VALUE RECEIVED,
                     hereby sells, assigns and transfers unto Relypsa, Inc., a Delaware corporation (the
“Company”), pursuant to the Repurchase Right under that certain Restricted Stock Purchase Agreement, dated              , 2007, by and between
the undersigned and the Company (the “Agreement”)      shares of Common Stock of the Company standing in the undersigned’s name on the books of the Company represented by
Certificate No.      and does hereby irrevocably constitute and appoint both the Company’s Secretary and the Company’s attorney, or either of them, to transfer said stock on the books of the Company with full power of
substitution in the premises. This Assignment may be used only in accordance with and subject to the terms and conditions of the Agreement, in connection with the repurchase of shares of Common Stock issued to the undersigned pursuant to the
Agreement, and only to the extent that such shares remain subject to the Company’s Repurchase Right under the Agreement. 
 Dated: 

 

	
	 (Signature)

	
	  

	 (Print Name)

 INSTRUCTION: Please do not fill in any blanks other than the signature line. The purpose of this
Assignment is to enable the Company to exercise its repurchase right set forth in the Agreement without requiring additional signatures on the part of Purchaser. 

  
 12. 

 EXHIBIT B 

JOINT ESCROW INSTRUCTIONS 

                          
          ,          
 SECRETARY 

RELYPSA, INC. 
 [address]

 Dear Sir/Madam: 
 As Escrow Agent for both
Relypsa, Inc., a Delaware corporation (the “Company”), and the undersigned recipient of stock of the Company (“Purchaser”), you are hereby authorized
and directed to hold the documents delivered to you pursuant to the terms of that certain Restricted Stock Purchase Agreement (the “Agreement”), dated
            ,          in accordance with the instructions set forth below. Defined terms not explicitly defined in these Joint Escrow Instructions
shall have the meaning set forth in the Agreement. 
 1. In the event Purchaser’s relationship with the Company ceases during the
vesting period set forth in the Agreement, the Company (or its assignee) will provide you with written notice of such Purchaser’s termination of service and, if applicable, notice of the Company’s intent to waive its Repurchase Right with
respect to all or any part of the unvested shares of Stock (as determined in accordance with Sections 2(b) and 2(c) of the Agreement). Unless you receive written notice from the Company stating that the Company intends to waive its Repurchase Right
with respect to all or any part of the unvested shares of Stock (in which case the number of shares transferred shall be as indicated in such notice), then, as of the date you receive written notice of the Purchaser’s termination of service as
described herein, the Company shall automatically repurchase all of the unvested shares of Stock and you are directed to automatically and simultaneously (unless the Company requests in writing that the actions contemplated herein occur at a later
date following Purchaser’s termination of service): (a) date the stock assignments necessary for the transfer in question, (b) fill in the number of shares of Stock being transferred (which shall be all of the unvested shares of Stock
as determined in accordance with Section 2(b) of the Agreement unless the Company has elected to waive its Reacquisition Right with respect to any portion of the unvested shares of Stock), and (c) deliver the same, together with the
certificate evidencing the shares of Stock to be transferred, to the Company. 
 2. Purchaser and the Company hereby authorize and direct
you to effectuate the transfer described above in accordance with the terms set forth herein and in the Agreement without further action by either Purchaser or the Company (other than the written notice of termination as described above). 

3. Purchaser authorizes the Company to deposit with you any certificates evidencing shares of Stock to be held by you hereunder and any
additions and substitutions to said shares of 

  
 13. 

 
Stock as specified in the Agreement. Purchaser does hereby constitute and appoint you as Purchaser’s attorney-in-fact and agent for the term of this escrow to execute with respect to such
securities (and any other securities or property acquired in connection therewith) all documents of assignment and/or transfer and all stock certificates necessary or appropriate to make all securities negotiable and complete any transaction herein
contemplated. 
 4. This escrow shall terminate upon the earliest of (i) the complete vesting of the Stock, (ii) the return to the
Company of the unvested shares of Stock, (iii) the Company’s waiver (in writing) of its right to reacquire the unvested shares of Stock, or any combination of (i), (ii) and/or (iii), provided that any such combination of (i),
(ii) and/or (iii) represents the total number of shares of Stock issued pursuant to the Agreement. 
 5. If at the time of
termination of this escrow you should have in your possession any documents, securities, or other property belonging to Purchaser, you shall deliver all of same to any pledgee entitled thereto or, if none, to Purchaser and shall be discharged of all
further obligations hereunder. 
 6. Your duties hereunder may be altered, amended, modified or revoked only by a writing signed by all of
the parties hereto. 
 7. You shall be obligated only for the performance of such duties as are specifically set forth herein and may rely
and shall be protected in relying or refraining from acting on any instrument reasonably believed by you to be genuine and to have been signed or presented by the proper party or parties or their assignees. You shall not be personally liable for any
act you may do or omit to do hereunder as Escrow Agent or as attorney-in-fact for Purchaser while acting in good faith and any act done or omitted by you pursuant to the advice of your own attorneys shall be conclusive evidence of such good faith.

 8. You are hereby expressly authorized to disregard any and all warnings given by any of the parties hereto or by any other person or
corporation, excepting only orders or process of courts of law, and are hereby expressly authorized to comply with and obey orders, judgments or decrees of any court. In case you obey or comply with any such order, judgment or decree of any court,
you shall not be liable to any of the parties hereto or to any other person, firm or corporation by reason of such compliance, notwithstanding any such order, judgment or decree being subsequently reversed, modified, annulled, set aside, vacated or
found to have been entered without jurisdiction. 
 9. You shall not be liable in any respect on account of the identity, authority or
rights of the parties executing or delivering or purporting to execute or deliver the Agreement or any documents or papers deposited or called for hereunder. 

10. You shall not be liable for the outlawing of any rights under any statute of limitations with respect to these Joint Escrow Instructions
or any documents deposited with you. 
 11. You shall be entitled to employ such legal counsel, including but not limited to Cooley Godward
Kronish LLP, and other experts as you may deem necessary properly to advise you in connection with your obligations hereunder, may rely upon the advice of such counsel, and may pay such counsel reasonable compensation therefor. 

  
 14. 

 12. Your responsibilities as Escrow Agent hereunder shall terminate if you shall resign by
written notice to each party. In the event of any such termination, the Company may appoint any officer or assistant officer of the Company as successor Escrow Agent and Purchaser hereby confirms the appointment of such successor or successors as
his attorney-in-fact and agent to the full extent of your appointment. 
 13. If you reasonably require other or further instruments in
connection with these Joint Escrow Instructions or obligations in respect hereto, the necessary parties hereto shall join in furnishing such instruments. 

14. It is understood and agreed that should any dispute arise with respect to the delivery and/or ownership or right of possession of the
securities, you may (but are not obligated to) retain in your possession without liability to anyone all or any part of said securities until such dispute shall have been settled either by mutual written agreement of the parties concerned or by a
final order, decree or judgment of a court of competent jurisdiction after the time for appeal has expired and no appeal has been perfected, but you shall be under no duty whatsoever to institute or defend any such proceedings. 

15. All notices required or permitted hereunder shall be in writing and shall be deemed effectively given: (a) upon personal delivery to
the party to be notified, (b) when sent by confirmed electronic mail or facsimile if sent during normal business hours of the recipient, and if not during normal business hours of the recipient, then on the next business day, (c) five
(5) calendar days after having been sent by registered or certified mail, return receipt requested, postage prepaid, or (d) one (1) business day after deposit with a nationally recognized overnight courier, specifying next day
delivery, with written verification of receipt. All communications shall be sent to the other party hereto at such party’s address set forth below, or at such other address as such party may designate by ten (10) days advance written
notice to the other party hereto: 
  

					
		 	COMPANY:	 	RELYPSA, INC.
		 		 	[address]
			
		 	PURCHASER:	 	  

		 		 	  

		 		 	  

			
		 	ESCROW AGENT:	 	RELYPSA, INC.
		 		 	[address]

  
 15. 

 16. By signing these Joint Escrow Instructions you become a party hereto only for the purpose of
said Joint Escrow Instructions; you do not become a party to the Agreement, 
 17. This instrument shall be binding upon and inure to the
benefit of the parties hereto, and their respective successors and permitted assigns. It is understood and agreed that references to “you” or “your” herein refer to the
original Escrow Agent and to any and all successor Escrow Agents. It is understood and agreed that the Company may at any time or from time to time assign its rights under the Agreement and these Joint Escrow Instructions in whole or in part. 

 

			
	 Very truly yours,

 
 RELYPSA,
INC.

		
	 By:
	 	  

		 	[Name]
		 	[Title]

 
			
		
	 PURCHASER:
	 	
	
	  

[Name]

  

	
	
	 ESCROW AGENT:

	
	 RELYPSA, INC.

	
	  

[Name]

	 [Title]

  
 16. 

 EXHIBIT C 

RELEASE AGREEMENT 

I understand that my position with RELYPSA, INC. (the “Company”) terminated
effective                     ,          (the “Separation Date”). The Company has
agreed that if I choose to sign this Release, the Company will extend to me certain benefits (minus the standard withholdings and deductions, if applicable) pursuant to the terms of the Restricted Stock Purchase Agreement (the
“Agreement”) entered into as of                      ,         , between myself and
the Company, and any agreements incorporated therein by reference. I understand that I am not entitled to such severance benefits unless I sign this Release. I understand that, regardless of whether I sign this Release, the Company will pay me all
of my accrued salary and vacation through the Separation Date, to which I am entitled by law. 
 In consideration for the severance benefits
I am receiving under the Agreement, I hereby release the Company and its officers, directors, agents, attorneys, employees, shareholders, parents, subsidiaries, and affiliates from any and all claims, liabilities, demands, causes of action,
attorneys’ fees, damages, or obligations of every kind and nature, whether they are now known or unknown, arising at any time prior to the date I sign this Release. This general release includes, but is not limited to: all federal and state
statutory and common law claims, claims related to my employment or the termination of my employment or related to breach of contract, tort, wrongful termination, discrimination, wages or benefits, or claims for any form of equity or compensation.
Notwithstanding the release in the preceding sentence, I am not releasing any right of indemnification I may have for any liabilities arising from my actions within the course and scope of my employment with the Company or within the course and
scope of my role as a member of the Board of Directors of the Company. 

  
 17. 

 
In releasing claims unknown to me at present, I am waiving all rights and benefits under Section 1542 of the California Civil Code, and any law or legal principle of similar effect in any
jurisdiction: “A general release does not extend to claims which the creditor does not know or suspect to exist in his favor at the time of executing the release, which if known by him must have materially affected his settlement with
the debtor.” 
 If I am forty (40) years of age or older as of the Separation Date, I acknowledge that I am knowingly and
voluntarily waiving and releasing any rights I may have under the federal Age Discrimination in Employment Act of 1967, as amended (“ADEA”). I also acknowledge that the consideration given for the waiver in the
above paragraph is in addition to anything of value to which I was already entitled. I have been advised by this writing, as required by the ADEA that: (a) my waiver and release do not apply to any claims that may arise after my signing of this
Release; (b) I should consult with an attorney prior to executing this Release; (c) I have twenty-one (21) days within which to consider this Release (although I may choose to voluntarily execute this Release earlier); (d) I have
seven (7) days following the execution of this release to revoke the Release; and (e) this Release will not be effective until the eighth day after this Release has been signed by me and delivered to the Company
(“Effective Date”). 
 Agreed: 
  

									
	Date	 		 		 	  

[NAME]

				
		 		 		 	Relypsa, Inc.
					
		 		 		 	By:	 	  

		 		 		 	Name:
		 		 		 	Title:

  
 18.

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