UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of

The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): ~~July~~October 3029, 2018

NxSTAGE MEDICAL, INC.

(Exact name of registrant as specified in its charter)



Delaware	000-51567	04-3454702
(State or other jurisdiction of incorporation)	(Commission File Number)	(I.R.S. Employer Identification No.)

350 Merrimack Street, Lawrence, MA		01843
(Address of principal executive offices)		(Zip Code)

(978) 687-4700

(Registrant's telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company o

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Item 1.01 Entry into a Material Definitive Agreement

~~On July~~As 30previously reported, ~~2018~~on August 7, ~~pursuant~~ to2017 ~~the~~NxStage Medical, Inc. (“NxStage”) entered into an Agreement and Plan of Merger ~~dated~~(“Merger asAgreement”) ofby ~~August~~and ~~7, 2017~~ among NxStage, Fresenius Medical Care Holdings, Inc. (“Fresenius”), ~~NxStage Medical, Inc. ("NxStage")~~ and Broadway Renal Services, Inc., a wholly-owned subsidiary of Fresenius (~~the "~~“Merger ~~Agreement"~~Sub”),. ~~Fresenius~~Upon ~~exercised~~the ~~its~~terms ~~option~~and subject to ~~extend~~ the ~~end~~conditions ~~date~~set offorth in the Merger Agreement, ~~from August~~Merger 7,Sub ~~2018~~will tobe ~~November~~merged 5,with ~~2018~~and into NxStage (“Merger”) with NxStage surviving as a wholly-owned subsidiary of Fresenius. Fresenius is also a key customer of NxStage.

~~NxStage~~On ~~and~~October ~~Fresenius~~29, ~~have~~2018, ~~been~~NxStage, ~~cooperating~~Fresenius ~~fully~~and ~~with~~Merger ~~the~~Sub ~~Federal~~amended ~~Trade Commission to obtain clearance of~~ the ~~pending merger (the "Fresenius~~ Merger~~"). NxStage~~ ~~continues~~Agreement to ~~expect~~make ~~to close~~ the ~~Fresenius~~following ~~Merger in 2018.~~ changes:


•	Extend the end date from November 5, 2018 to February 5, 2019.


•	Confirm that the only conditions to Fresenius’ obligation to close the transaction are (1) obtaining the Federal Trade Commission’s clearance, (2) the absence of any governmental law or order preventing the consummation of the transaction and (3) NxStage’s compliance, in all material respects, with its covenants under the Merger Agreement.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

NxStage Medical, Inc.

By: /s/ ~~Winifred L~~Jeffrey H. ~~Swan~~Burbank

~~Winifred~~Jeffrey LH. ~~Swan~~Burbank

~~General~~Chief ~~Counsel~~ Executive Officer

Date: ~~July~~October 30, 2018

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