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 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 *
  Benjamin Locke M.
2. Date of Event Requiring Statement (Month/Day/Year)
03/16/2022
3. Issuer Name and Ticker or Trading Symbol
TECOGEN INC. [TGEN]
(Last)
(First)
(Middle)
45 FIRST AVE
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
CEO
5. If Amendment, Date Original Filed(Month/Day/Year)
03/16/2022
(Street)

WALTHAM, MA 02451
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 5,918
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) 06/03/2014(1) 06/03/2023 Common Stock 37,500 $ 3.2 D  
Stock Option (Right to Buy) 11/19/2015(2) 10/29/2024 Common Stock 9,200 $ 10.33 D  
Stock Option (Right to Buy) 12/11/2015(2) 12/11/2024 Common Stock 18,400 $ 5.65 D  
Stock Option (Right to Buy) 12/18/2015(1) 12/18/2024 Common Stock 62,500 $ 4.96 D  
Stock Option (Right to Buy) 12/18/2015(1) 12/18/2024 Common Stock 100,000 $ 4.96 D  
Stock Option (Right to Buy) 06/10/2015(2) 06/10/2025 Common Stock 9,200 $ 5.65 D  
Stock Option (Right to Buy) 05/31/2019(1) 05/31/2028 Common Stock 200,000 $ 3.68 D  
Stock Option (Right to Buy)   (3) 07/15/2030 Common Stock 300,000 $ 0.74 D  
Stock Option (Right to Buy) 01/21/2023(4) 01/21/2031 Common Stock 70,000 $ 1.1 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Benjamin Locke M.
45 FIRST AVE
WALTHAM, MA 02451
  X     CEO  

Signatures

/s/ Benjamin M. Locke 05/06/2022
**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) Vests 25% per year
(2) Converted from options to acquire shares of American DG Energy Inc.; vested in connection with merger of American DG Energy Inc. with a subsidiary of Tecogen Inc.
(3) Vests 50% upon achievement of Adjusted EBITDA goal in two consecutive quarters, and 50% upon achievement of Adjusted EBITDA goal in four consecutive quarters
(4) Vests 50% per year

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