Ownership Submission
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 *
Sennott John Langton JR
   2. Issuer Name and Ticker or Trading Symbol
Darwin Professional Underwriters Inc [DR] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
S.V.P. - CFO
(Last)
(First)
(Middle)
9 FARM SPRINGS ROAD		 3. Date of Earliest Transaction (Month/Day/Year)
02/23/2007
(Street)

FARMINGTON, CT 06032		 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 02/23/2007 02/23/2007 A   2,544 (1) A $ 25.3 (1) 173,794 (2) 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
Employee Stock Option (right to buy) $ 25.3 02/23/2007 02/23/2007 A   6,299 (3)     (3) 02/23/2017 common stock 6,299 (3) 20,856 (4) D  
Employee Stock Option (right to buy) $ 16               (5) 05/19/2006 common stock 14,557   14,557 (6) D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Sennott John Langton JR
9 FARM SPRINGS ROAD
FARMINGTON, CT 06032		   X     S.V.P. - CFO  

Signatures

 John L. Sennott, Jr. by Timothy J. Curry, attorney-in-fact   02/27/2007
**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) Restricted stock award granted under Issuer's 2006 Stock Incentive Plan; price represents mean value of the high and low trades on the NYSE Arca exchange on February 23, 2007, the grant date, as per Plan spefication.
(2) Amount reflects the effect of a 33-for-2 stock split that became effective on May 19, 2006, the initial public offering date of the issuer's common stock (the "stock split"). Pre-split amount shown as 10,378.79 shares in prior filing, now represents 171,250 post-split shares.
(3) Employee stock option, granted 02/23/2007, under the issuer's 2006 Stock Incentive Plan (the "Plan") at a fair market value determined in accordance with the Plan of $25.30 per share. Exercisable up to an aggregate of 25% on or after 02/23/2008, up to an aggregate 50% on or after 02/23/2009, up to an aggregate 75% on or after 02/23/2010 and in its entirety on or after 02/23/2011, subject to expiration or forfeiture in accordance with the Plan.
(4) Amount reflects the effect of a 33-for-2 stock split that became effective on May 19, 2006, the initial public offering date of the issuer's common stock (the "stock split"). Pre-split amount shown as 882.24 shares in prior filing, now represents 14,557 post-split shares.
(5) The option vests in four equal installments on May 19, 2007, 2008, 2009 and 2010, subject to stockholder approval at the 2007 Annual Meeting.
(6) Amount reflects the effect of a 33-for-2 stock split that became effective on May 19, 2006, the initial public offering date of the issuer's common stock (the "stock split"). Pre-split amount shown as 882.24 shares in prior filing, now represents 14,557 post-split shares.

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