XNAS:NXTM NxStage Medical, Inc. Insider Activity 4 Filing - 5/9/2012

Effective Date 5/9/2012

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FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
Swan Winifred L
  2. Issuer Name and Ticker or Trading Symbol
NxStage Medical, Inc. [NXTM]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
SVP and General Counsel
(Last)
(First)
(Middle)
C/O NXSTAGE MEDICAL, INC., 439 SOUTH UNION STREET, 5TH FLOOR
3. Date of Earliest Transaction (Month/Day/Year)
05/09/2012
(Street)

LAWRENCE, MA 01843
4. If Amendment, Date Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)
4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)
5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)
6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)
7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 05/09/2012   M   1,000 A $5.47 17,267 D  
Common Stock 05/09/2012   M   1,541 A $4.54 18,808 D  
Common Stock 05/09/2012   S(1)   2,541 D $16.0207(2) 16,267 D  
Common Stock 05/11/2012   S(1)   3,000 D $15.56 13,267 D  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)
5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)
6. Date Exercisable and Expiration Date
(Month/Day/Year)
7. Title and Amount of Underlying Securities
(Instr. 3 and 4)
8. Price of Derivative Security
(Instr. 5)
9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)
10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)
11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option (Right to Buy) $5.47 05/09/2012   M     1,000 02/13/2004(3) 02/13/2014 Common Stock 1,000 $ 0 4,997 D  
Stock Option (Right to Buy) $4.54 05/09/2012   M     1,541 04/27/2008(4) 03/26/2015 Common Stock 1,541 $ 0 7,803 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Swan Winifred L
C/O NXSTAGE MEDICAL, INC.
439 SOUTH UNION STREET, 5TH FLOOR
LAWRENCE, MA 01843
      SVP and General Counsel  

Signatures

 Winifred L. Swan   05/11/2012
** Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 12, 2010, amended August 23, 2010, amended on December 16, 2010 and further amended on November 8, 2011.
(2) The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $15.87 to $16.15. The reporting person undertakes to provide to the issuer, any holder of the issuer's stock, or the SEC, upon request, full information regarding the number of shares sold at each separate price within the range described above.
(3) These stock options were fully exerciable on the date of grant and, upon exercise, were subject to a repurchase right in favor of us. This repurchase right terminated upon the closing of our initial public offering and all such options are currently exercisable.
(4) This option was granted on March 27, 2008 and vests over four years in equal monthly installments.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

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XNAS:NXTM NxStage Medical Inc Insider Activity 4 Filling

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XNAS:NXTM NxStage Medical, Inc. Insider Activity 4 Filing - 5/9/2012
Name |  Ticker |  Star Rating |  Market Cap |  Stock Type |  Sector |  Industry Star Rating |  Investment Style |  Total Assets |  Category |  Top Holdings |  Top Sectors |  Symbol |  Title Star Rating |  Category |  Total Assets |  Top Holdings |  Top Sectors |  Symbol |  Name Title |  Date |  Author |  Collection |  Interest |  Popularity Topic |  Sector |  Key Indicators |  User Interest |  Market Cap |  Industry Name |  Ticker |  Star Rating |  Market Cap |  Stock Type |  Sector |  Industry Star Rating |  Investment Style |  Total Assets |  Category |  Top Holdings |  Top Sectors |  Symbol / Ticker |  Title Star Rating |  Category |  Total Assets |  Symbol / Ticker |  Name Title |  Date |  Author |  Collection |  Popularity |  Interest Title |  Date |  Company |  Symbol |  Interest |  Popularity Title |  Date |  Company |  Symbol |  Interest |  Popularity

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