Highland Capital Management Reveals Investment In Relypsa (RLYP)

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(b) The Small-Cap Fund, Highland Fund Advisors and Strand XVI may be deemed the beneficial owners of 0.1% of the outstanding shares of Common Stock held by the Small-Cap Fund. This percentage was determined by dividing
37,000, the number of shares of Common Stock held directly by the Small-Cap Fund, by 44,747,978, which is the number of shares of Common Stock outstanding as of May 2, 2016 according to the Issuers Quarterly Report on Form 10-Q filed with
the Securities Exchange Commission on May 4, 2016.

The Credit Fund, NexPoint and NexPoint GP may be deemed the
beneficial owners of 5.8% of the outstanding shares of Common Stock held by the Credit Fund. This percentage was determined by dividing 2,600,000, the number of shares of Common Stock held directly by the Credit Fund, by 44,747,978, which is the
number of shares of Common Stock outstanding as of May 2, 2016 according to the Issuers Quarterly Report on Form 10-Q filed with the Securities Exchange Commission on May 4, 2016.

The Select Fund, Select GP, Select LLC, Highland Capital and Strand may be deemed the beneficial owner of 7.3% of the outstanding Common
Stock. This percentage was determined by dividing 3,277,900, the number of shares of Common Stock held directly by the Select Fund, by 44,747,978, which is the number of shares of Common Stock outstanding as of May 2, 2016 according to the
Issuers Quarterly Report on Form 10-Q filed with the Securities Exchange Commission on May 4, 2016.

Mr. Dondero may be
deemed the beneficial owner of 13.2% of the outstanding Common Stock. This percentage was determined by dividing 5,914,900, the number of shares of Common Stock held directly by the Funds, by 44,747,978, which is the number of shares of Common Stock
outstanding as of May 2, 2016 according to the Issuers Quarterly Report on Form 10-Q filed with the Securities Exchange Commission on May 4, 2016.

(c) The Small-Cap Fund has the sole power to vote and dispose of the 37,000 shares of Common Stock that it holds directly. Highland Fund Advisors and Strand XVI have the shared power to vote and dispose of the 37,000 shares
of Common Stock held by the Small-Cap Fund.

The Credit Fund has the sole power to vote and dispose of the 2,600,000 shares
of Common Stock that it holds directly. NexPoint and NexPoint GP have the shared power to vote and dispose of the 2,600,000 shares of Common Stock held by the Credit Fund.

The Select Fund has the sole power to vote and dispose of the 3,277,900 shares of Common Stock that it holds directly. Select GP, Select LLC,
Highland Capital and Strand have the shared power to vote and dispose of the 3,277,900 shares of Common Stock held by the Select Fund.

Mr. Dondero has the the shared power to vote and dispose of the 5,914,900 shares of Common Stock held by the Funds.

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