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
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

NEWHOUSE STEPHAN F 		2. Issuer Name and Ticker or Trading Symbol

ALTERRA CAPITAL HOLDINGS Ltd [ ALTE ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__ X __ Director                      _____ 10% Owner
_____ Officer (give title below)      _____ Other (specify below)
(Last)          (First)          (Middle)

C/O ALTERRA CAPITAL HOLDINGS LIMITED, ALTERRA HOUSE, 2 FRONT STREET 		3. Date of Earliest Transaction (MM/DD/YYYY)

3/5/2013
(Street)

HAMILTON, BERMUDA, D0 HM 11
(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

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
Warrants (right to buy)   $18.502   3/5/2013     A      269.27   (1) (2)        (3) 12/15/2015   Common Shares   269.27     (1) (2) 51632.03   (1) (2) D  
 

Explanation of Responses:
( 1)  Pursuant to the anti-dilution provisions of warrants to purchase common shares of Alterra Capital Holdings Limited ("Alterra") held by Mr. Newhouse, following the declaration of a dividend by Alterra, (i) Mr. Newhouse is entitled to elect to receive a payment in cash in respect of such dividend for each common share of Alterra purchased pursuant to the warrants (such payment to be made at the time of exercise of the warrants), or (ii) if Mr. Newhouse makes no election, Mr. Newhouse will receive an adjustment to the exercise price of the warrants held by him (and a resulting change to the number of common shares of Alterra for which his warrants are exercisable) following the record date for such dividend.
( 2)  On March 5, 2013, the exercise price of warrants held by Mr. Newhouse adjusted (and a resulting adjustment was made to the number of common shares of Alterra for which his warrants are exercisable) in respect of the $0.16 per share dividend declared by Alterra to holders of record of common shares of Alterra as of February 19, 2013. Pursuant to this adjustment, the exercise price of warrants held by Mr. Newhouse reduced from $18.599 to $18.502 and Mr. Newhouse became entitled to exercise his warrants for an additional 269.27 common shares of Alterra.
( 3)  All warrants are immediately exercisable.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
NEWHOUSE STEPHAN F
C/O ALTERRA CAPITAL HOLDINGS LIMITED
ALTERRA HOUSE, 2 FRONT STREET
HAMILTON, BERMUDA, D0 HM 11 		X



Signatures
Bernard K. Asirifi, Attorney-in-Fact 3/5/2013
** 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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