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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1. Name and Address of Reporting Person * TRANTER GREGORY D   2. Issuer Name and Ticker or Trading Symbol HANOVER INSURANCE GROUP, INC. [THG] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Senior Vice President (Last) (First) (Middle) C/O THE HANOVER INSURANCE GROUP, INC., 440 LINCOLN ST. (E-6) 3. Date of Earliest Transaction (Month/Day/Year) 02/25/2010 (Street) WORCESTER, MA 01653 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 02/25/2010   A(1)   1,658 A (1) 28,644 D   Common Stock 02/25/2010   F(2)   601 D $ 41.8 28,043 D   Common Stock 02/26/2010   A(3)   3,000 A (3) 31,043 (4) D

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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

Common Stock (right to buy)

$ 42.15

02/26/2010

A

20,000

(5)

02/26/2020

Common Stock

20,000

$ 0

20,000

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
TRANTER GREGORY D C/O THE HANOVER INSURANCE GROUP, INC. 440 LINCOLN ST. (E-6) WORCESTER, MA 01653			Senior Vice President

Signatures

Walter H. Stowell pursuant to Confirming Statement		03/01/2010
**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)	On February 23, 2007, the Reporting Person was granted 2,260 (target) performance-based restricted stock units (the "PBRSUs") pursuant to the Issuer's 2006 Long-Term Incentive Plan (the "Plan"). The actual PBRSU award could have been as low as 0% or as high as 150% of target based upon the Issuer achieving certain three-year average (2007-2009) adjusted return on equity and premium growth. On February 25, 2010 the Issuer's Compensation Committee determined that the three-year average adjusted return on equity and premium growth was achieved at a level that entitled the holders of the PBRSUs to 73.33% of the target award. Accordingly, on February 25, 2010, the PBRSUs vested and converted into the number of shares indicated on this Form 4.
(2)	Tax withholding in connection with vesting of PBRSUs.
(3)	Grant of restricted stock units pursuant to the Plan.
(4)	Does not include approximately 507 shares held indirectly in 401(k)
(5)	50% of the options vest on the third anniversary of the grant date and 50% of the options vest on the fourth anniversary of the grant date.

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