Item 2.02. Results of Operations and Financial Condition.

On May 8, 2012, NxStage Medical, Inc. ("NxStage") announced its financial results for quarter ended March 31, 2012. The full text of the press release issued in connection with this announcement is set forth in Exhibit 99.1 to this Current Report on Form 8-K.

The information in this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed to be "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01. Financial Statement and Exhibits.

(d) Exhibits.

The following exhibit to this Current Report on Form 8-K pursuant to Item 2.02 shall be deemed to be furnished and not filed:

99.1 Press release dated May 8, 2012 issued by NxStage Medical, Inc.

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