X0306 4 2015-12-31 0 0001416792 Relypsa Inc RLYP 0001591468 Stahl Wilhelm C/O RELYPSA, INC. 100 CARDINAL WAY REDWOOD CITY CA 94063 0 1 0 0 SVP, Chief Technology Officer Common Stock 2015-12-31 4 M 0 16291 3.96 A 31144 D Common Stock 2015-12-31 4 M 0 3709 3.96 A 34853 D Common Stock 2015-12-31 4 S 0 20000 28.5279 D 14853 D Stock Option (right to buy) 3.96 2015-12-31 4 M 0 16291 0.00 D 2021-09-13 Common Stock 16291 27759 D Stock Option (right to buy) 3.96 2015-12-31 4 M 0 3709 0.00 D 2022-09-27 Common Stock 3709 46597 D Includes 14,000 Restricted Stock Units. The sale reported in this Form 4 was effected pursuant to the Reporting Person's Rule 10b5-1 trading plan. This transaction was executed in multiple trades in prices ranging from $28.19 to $28.9515, inclusive. The price reported in Column 4 above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote. 100% of the shares subject to the option are fully vested and exercisable. The shares subject to the option are early exercisable. 25% of the shares subject to the option vest on the first anniversary measured from September 19, 2012 (the "Vesting Commencement Date"), and 1/48th of the total number of shares vest in thirty-six (36) successive and equal monthly installments thereafter, such that 100% of the shares subject to the option will be fully vested on the fourth anniversary of the Vesting Commencement Date. /s/ Ronald A. Krasnow, as Attorney-in-Fact for Wilhelm Stahl 2016-01-04