Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF 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 *
  BROWN BONNIE JEAN
 2. Date of Event Requiring Statement (Month/Day/Year)
05/20/2014		 3. Issuer Name and Ticker or Trading Symbol
TECOGEN INC. [TGEN]
(Last)
(First)
(Middle)
C/O TECOGEN, INC., 45 FIRST AVENUE		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
CFO, Treasurer and Secretary
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

WALTHAM, MA 02541		 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 Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock 12,500
D
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option (Right to Buy)   (1) 02/13/2015 Common Stock 25,000 $ 1.2 D  
Stock Option (Right to Buy)   (2) 02/18/2020 Common Stock 25,000 $ 2.6 D  
Stock Option (Right to Buy)   (3) 03/11/2019 Common Stock 50,000 $ 2 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
BROWN BONNIE JEAN
C/O TECOGEN, INC.
45 FIRST AVENUE
WALTHAM, MA 02541		       CFO, Treasurer and Secretary  

Signatures

/s/ Bonnie J. Brown 05/21/2014
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(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) The options became exercisable in four equal installments on February 13, 2009, 2010, 2011 and 2012.
(2) The options became exercisable in four equal installments on February 18, 2011, 2012, 2013 and 2014.
(3) The options became exercisable in four equal installments on March 11, 2010, 2011, 2012 and 2013.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, See Instruction 6 for procedure.

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