About Fresenius Medical Care
Fresenius Medical Care is the world's largest provider of products and services for individuals with renal diseases of which around 3 million patients worldwide regularly undergo dialysis treatment. Through its network of 3,690 dialysis clinics, Fresenius Medical Care provides dialysis treatments for 315,305 patients around the globe. Fresenius Medical Care is also the leading provider of dialysis products such as dialysis machines or dialyzers. Along with the core business, the company focuses on expanding the range of related medical services in the field of Care Coordination. Fresenius Medical Care is listed on the Frankfurt Stock Exchange (FME) and on the New York Stock Exchange (FMS).

For more information visit the Company’s website at www.freseniusmedicalcare.com.

BofA Merrill Lynch is serving as exclusive financial advisor to Fresenius Medical Care.

About NxStage
NxStage Medical, Inc. (Nasdaq: NXTM) is a leading medical technology company, headquartered in Lawrence, Massachusetts, USA, that develops, manufactures and markets innovative products for the treatment of end-stage renal disease (ESRD) and acute kidney failure. NxStage has also established a small number of dialysis clinics committed to the development of innovative care delivery models for patients with ESRD. For more information on NxStage and its products and services, please visit the Company's website at http://www.nxstage.com and www.nxstagekidneycare.com.

Piper Jaffray is serving as exclusive financial advisor to NxStage.

Disclaimer Regarding Forward-Looking Statements

This release contains forward-looking statements, including statements regarding Fresenius Medical Care’s planned acquisition of NxStage Medical, Inc., the expected timing of the closing of the transaction, the synergies expected to be achieved from the transaction, and the expected benefits to Fresenius Medical Care’s business, product offerings and profitability and other expected financial impacts of the transaction. Actual results could differ materially from those expressed or implied in these forward-looking statements due to certain factors, including, among others: the failure or inability of either Fresenius Medical Care or NxStage Medical, Inc. to satisfy closing conditions or obtain approvals necessary to close the transaction; unexpected costs or delays associated with efforts to obtain the regulatory or other approvals necessary to close the transaction; risks associated with litigation or regulatory actions related to the transaction; unanticipated difficulties and expenditures in connection with integration programs; customer and shareholder reaction to the transaction; significant transaction costs and assumption of unknown liabilities; changes in business, economic and competitive conditions; regulatory reforms; foreign exchange rate fluctuations; risks and uncertainties in litigation or investigative proceedings, whether or not related to the transaction; and the availability of financing. These and other risks and uncertainties are detailed in Fresenius Medical Care AG & Co. KGaA's reports filed with the U.S. Securities and Exchange Commission. Fresenius Medical Care AG & Co. KGaA does not undertake any responsibility to update the forward-looking statements in this release.

Important Information for Investors and Security Holders

This communication may be deemed to be solicitation material in respect of the proposed merger of NxStage with Broadway Renal Services, Inc., a wholly-owned subsidiary of Fresenius Medical Care Holdings, Inc. In connection with the proposed merger, NxStage intends to file relevant materials with the U.S. Securities and Exchange Commission (SEC), including a preliminary proxy statement on Schedule 14A. Following the filing of a definitive proxy statement, NxStage will mail the definitive proxy statement and a proxy card to each stockholder entitled to vote at the special meeting relating to the proposed merger. INVESTORS AND SECURITY HOLDERS OF NXSTAGE ARE URGED TO READ THESE MATERIALS (INCLUDING ANY AMENDMENTS OR SUPPLEMENTS THERETO) AND ANY OTHER RELEVANT DOCUMENTS IN CONNECTION WITH THE PROPOSED MERGER THAT NXSTAGE WILL FILE WITH THE SEC WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT NXSTAGE AND THE PROPOSED MERGER. The preliminary proxy statement, the definitive proxy statement and other relevant materials in connection with the proposed merger (when they become available), and any other documents filed by NxStage with the SEC, may be obtained free of charge at the SEC’s website at www.sec.gov. In addition, investors and security holders may obtain free copies of the documents filed with the SEC or by sending a request to NxStage’s Investor Relations Department at NxStage Medical, Inc., 350 Merrimack St., Lawrence, MA 01843.

NxStage and its directors and executive officers may be deemed to be participants in the solicitation of proxies from NxStage’s stockholders with respect to the proposed merger. Information about NxStage’s directors and executive officers and their ownership of NxStage’s common stock is set forth in NxStage’s Annual Report on Form 10-K for the fiscal year ended December 31, 2016, which was filed with the SEC on February 28, 2017, and NxStage’s proxy statement for its 2017 Annual Meeting of Stockholders, which was filed with the SEC on April 27, 2017. Information regarding the identity of the potential participants, and their direct or indirect interests in the merger, by security holdings or otherwise, will be set forth in the proxy statement and other materials to be filed with the SEC in connection with the proposed merger.