FORM 4
[ X ] 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
                                                                                  
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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(f) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

MAY THOMAS J 		2. Issuer Name and Ticker or Trading Symbol

NSTAR/MA [ NST ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      _____ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
Chr, President, CEO & Trustee
(Last)          (First)          (Middle)

800 BOYLSTON STREET 		3. Date of Earliest Transaction (MM/DD/YYYY)

4/10/2012
(Street)

BOSTON, MA 02199
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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 Shares   4/10/2012     A    36400   A $0   840026   (1) D    
Common Shares   4/10/2012     A    77500   (2) A $0   917526   (1) D    
Common Shares   4/10/2012     F    28157   D $47.65   889369   (1) D    
Common Shares   4/10/2012     D    689432   D   (3) 199937   D    
Common Shares   4/10/2012     D    77500   D   (4) 122437   D    
Common Shares   4/10/2012     D    122437   D   (5) 0   D    
Common Shares   4/10/2012     D    45806   D   (6) 0   I   By 401(k)  

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 7. Title and Amount of Securities Underlying Derivative Security
(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
Employee Stock Option   $24.20   4/10/2012     D         200000    4/28/2007   4/28/2014   Common Shares   200000     (7) 0   D    
Employee Stock Option   $29.60   4/10/2012     D         200000    6/9/2008   6/9/2015   Common Shares   200000     (8) 0   D    
Employee Stock Option   $27.73   4/10/2012     D         200000    4/27/2009   4/27/2016   Common Shares   200000     (9) 0   D    
Employee Stock Option   $36.89   4/10/2012     D         186000    5/3/2010   5/3/2017   Common Shares   186000     (10) 0   D    
Employee Stock Option   $32.45   4/10/2012     D         150000    1/24/2011   1/24/2018   Common Shares   150000     (11) 0   D    
Employee Stock Option   $34.02   4/10/2012     D         159000    1/22/2012   1/22/2019   Common Shares   159000     (12) 0   D    
Employee Stock Option   $35.28   4/10/2012     D         133000    1/28/2013   1/28/2020   Common Shares   133000     (13) 0   D    

Explanation of Responses:
( 1)  Includes 689,432 Phantom Shares (deferred compensation obligations). Each Phantom Share is payable in one Common Share.
( 2)  Represents deferred share units of 40,000 shares that vest in three equal annual installments beginning on 01/27/2012 and 37,500 shares that vest in three equal annual installments beginning on 1/26/2013.
( 3)  Disposition of Phantom Shares pursuant to the merger agreement between issuer and Northeast Utilities ("NU") in exchange for 904,534 NU phantom shares having a market value of $36.79 per share at the effective time of the merger.
( 4)  Disposed of pursuant to the Merger in exchange for a total of 101,680 NU restricted shares subject to time vesting conditions.
( 5)  Disposed of pursuant to the Merger in exchange for a total of 160,637 NU common shares.
( 6)  Disposed of pursuant to the Merger in exchange for 60,097 NU common shares.
( 7)  This option was assumed by NU in the merger and replaced with an option to purchase 262,400 NU Common Shares at a price of $18.45 per share.
( 8)  This option was assumed by NU in the merger and replaced with an option to purchase 262,400 NU Common Shares at a price of $22.57 per share.
( 9)  This option was assumed by NU in the merger and replaced with an option to purchase 262,400 NU Common Shares at a price of $21.14 per share.
( 10)  This option was assumed by NU in the merger and replaced with an option to purchase 244,032 NU Common Shares at a price of $28.12 per share.
( 11)  This option was assumed by NU in the merger and replaced with an option to purchase 196,800 NU Common Shares at a price of $24.74 per share.
( 12)  This option was assumed by NU in the merger and replaced with an option to purchase 208,608 NU Common Shares at a price of $25.93 per share.
( 13)  This option was assumed by NU in the merger and replaced with an option to purchase 174,496 NU Common Shares at a price of $26.90 per share.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
MAY THOMAS J
800 BOYLSTON STREET
BOSTON, MA 02199

Chr, President, CEO & Trustee

Signatures
/s/ Richard J. Morrison - Attorney in Fact for Thomas J. May 4/10/2012
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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