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 *

Grossack Marshall J 		2. Issuer Name and Ticker or Trading Symbol

Allied World Assurance Co Holdings, AG [ AWH ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

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

ALLIED WORLD ASSURANCE CO. HOLDINGS, AG, GUBELSTRASSE 24, PARK TOWER, 15TH FLOOR 		3. Date of Earliest Transaction (MM/DD/YYYY)

2/22/2015
(Street)

ZUG, V8 6300
(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   2/22/2015     M    1461   A $0.00   (1) 213505   D    
Common Shares   2/22/2015     M    894   A $0.00   (2) 214399   D    
Common Shares   2/22/2015     D    1617   D $40.4481   (3) 212782   D    
Common Shares   2/22/2015     F    342   (4) D $40.54   212440   D    

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
Restricted Stock Units     (1) 2/22/2015     M         1461      (5)   (5) Common Shares   1461     (1) 12494   (6) D    
Restricted Stock Units     (2) 2/22/2015     M         894      (7)   (7) Common Shares   894     (2) 11600   (6) D    

Explanation of Responses:
( 1)  On February 22, 2012, the reporting person was granted 5,850 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into (i) 1,170 common shares and (ii) cash equal to the market value of 4,680 common shares (measured at the date of vesting) upon the vesting of such Restricted Stock Units. These Restricted Stock Units were previously reported as a grant of 1,950 Restricted Stock Units converting into (i) 390 common shares and (ii) cash equal to the market value of 1,560 common shares. These amounts have been adjusted to reflect the issuer's 3-for-1 stock split paid on May 23, 2014.
( 2)  On February 22, 2011, the reporting person was granted 3,570 Restricted Stock Units for no monetary consideration. The Restricted Stock Units convert into (i) 1,785 common shares and (ii) cash equal to the market value of 1,785 common shares (measured at the date of vesting) upon the vesting of such Restricted Stock Units. These Restricted Stock Units were previously reported as a grant of 1,190 Restricted Stock Units converting into (i) 595 common shares and (ii) cash equal to the market value of 595 common shares. These amounts have been adjusted to reflect the issuer's 3-for-1 stock split paid on May 23, 2014.
( 3)  The fair market value of the cash portion was determined using the daily volume-weighted average sales price of the common shares for the five consecutive trading days prior to February 22, 2015, which was on a Sunday.
( 4)  Exclusively represents shares withheld by the Company with respect to the payment of withholding tax liability incurred upon the vesting of Restricted Stock Units.
( 5)  The Restricted Stock Units vest in four equal installments with the first installment vesting on February 22, 2013.
( 6)  Represents Restricted Stock Units held by the reporting person that vest in whole or in part in cash.
( 7)  The Restricted Stock Units vested in four equal installments with the first installment vesting on February 22, 2012.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Grossack Marshall J
ALLIED WORLD ASSURANCE CO. HOLDINGS, AG
GUBELSTRASSE 24, PARK TOWER, 15TH FLOOR
ZUG, V8 6300

EVP, Chief Actuary

Signatures
/s/ Wayne H. Datz, by Power of Attorney 2/24/2015
** 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).
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