Tecogen Inc. reports that Portolan Capital Management, LLC and George McCabe each beneficially own 1,552,232 shares of Common Stock, representing 5.19% of the class. The filing states Portolan holds sole voting and dispositive power over these shares; Mr. McCabe is identified as the manager and reports indirect ownership.
Positive
None.
Negative
None.
Insights
Holding disclosure: a single investor and its manager report a 5.19% stake in Tecogen.
Portolan Capital Management, LLC is disclosed as beneficial owner of 1,552,232 shares with sole voting and dispositive power. The filing attributes indirect interest to George McCabe in his capacity as Manager.
The filing is a routine beneficial ownership disclosure under SCHEDULE 13G; it records position size and voting/control status but does not indicate planned transactions or changes in holdings.
Key Figures
Shares beneficially owned:1,552,232 sharesPercent of class:5.19%Sole voting power:1,552,232 shares+1 more
4 metrics
Shares beneficially owned1,552,232 sharesreported on Schedule 13G
Percent of class5.19%percent of Tecogen common stock
Sole voting power1,552,232 sharesPortolan Capital sole voting power
Sole dispositive power1,552,232 sharesPortolan Capital sole dispositive power
Key Terms
beneficially own/beneficial ownership, sole dispositive power, Schedule 13G
3 terms
beneficially own/beneficial ownershipregulatory
"This statement is being filed with respect to the shares Common Stock of the Issuer beneficially owned"
sole dispositive powerregulatory
"Sole Dispositive Power 1,552,232.00"
Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.
Schedule 13Gregulatory
"form_type: SCHEDULE 13G"
A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.
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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
Tecogen Inc.
(Name of Issuer)
Common Stock, $0.001 par value per share
(Title of Class of Securities)
87876P201
(CUSIP Number)
06/03/2026
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Rule 13d-1(b)
Rule 13d-1(c)
Rule 13d-1(d)
schemaVersion:
SCHEDULE 13G
CUSIP Number(s):
87876P201
1
Names of Reporting Persons
Portolan Capital Management, LLC
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
1,552,232.00
6
Shared Voting Power
0.00
7
Sole Dispositive Power
1,552,232.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,552,232.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
5.19 %
12
Type of Reporting Person (See Instructions)
IA
SCHEDULE 13G
CUSIP Number(s):
87876P201
1
Names of Reporting Persons
George McCabe
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
1,552,232.00
6
Shared Voting Power
0.00
7
Sole Dispositive Power
1,552,232.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,552,232.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
5.19 %
12
Type of Reporting Person (See Instructions)
IN
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
Tecogen Inc.
(b)
Address of issuer's principal executive offices:
76 Treble Cove Road North Billerica, MA, 01862
Item 2.
(a)
Name of person filing:
This statement is being filed with respect to the shares Common Stock of the Issuer beneficially owned (1) directly by Portolan Capital Management, LLC, a registered investment adviser, in its capacity as investment manager for various clients, and (2) indirectly by George McCabe, the Manager of Portolan Capital Management, LLC. Portolan Capital Management, LLC and Mr. McCabe are sometimes individually referred to herein as a "Reporting Person" and collectively as the "Reporting Persons."
(b)
Address or principal business office or, if none, residence:
The address of the principal business office of each of the Reporting Persons is 2 International Place, FL 26, Boston, MA 02110.
(c)
Citizenship:
Portolan Capital Management, LLC - DE
Mr. McCabe - USA
(d)
Title of class of securities:
Common Stock, $0.001 par value per share
(e)
CUSIP Number(s):
87876P201
Item 3.
If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)
Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)
Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)
Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)
Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)
An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)
An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)
A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)
A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)
A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)
A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
(k)
Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.
Ownership
(a)
Amount beneficially owned:
The information required by Item 4(a) is set forth in Row 9 of the cover page for each of the Reporting Persons and is incorporated by reference herein.
(b)
Percent of class:
The information required by Item 4(b) is set forth in Row 11 of the cover page for each of the Reporting Persons and is incorporated by reference herein.
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
The information required by Item 4(c) is set forth in Row 5 of the cover page for each of the Reporting Persons and is incorporated by reference herein.
(ii) Shared power to vote or to direct the vote:
0
(iii) Sole power to dispose or to direct the disposition of:
The information required by Item 4(c) is set forth in Row 7 of the cover page for each of the Reporting Persons and is incorporated by reference herein.
(iv) Shared power to dispose or to direct the disposition of:
0
Item 5.
Ownership of 5 Percent or Less of a Class.
Not Applicable
Item 6.
Ownership of more than 5 Percent on Behalf of Another Person.
If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.
Various persons have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the Common Stock of Tecogen Inc. No one person's interest in the Common Stock of Tecogen Inc. is more than five percent of the total outstanding Common Stock.
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
Not Applicable
Item 8.
Identification and Classification of Members of the Group.
Not Applicable
Item 9.
Notice of Dissolution of Group.
Not Applicable
Item 10.
Certifications:
By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
What stake does Portolan Capital hold in Tecogen (TGEN)?
Portolan Capital Management, LLC beneficially owns 1,552,232 shares of Tecogen Common Stock. The filing states this equals 5.19% of the class and shows sole voting and dispositive power for those shares.
Why is George McCabe listed on the Schedule 13G for TGEN?
George McCabe is listed as Manager of Portolan Capital Management, LLC and is reported as having an indirect interest in the same 1,552,232 shares representing 5.19% of Tecogen's common stock under the filing.
Does the Schedule 13G indicate Portolan will sell or buy more TGEN shares?
The filing reports existing beneficial ownership and voting/dispositive power only. It does not state any intended purchases or sales, nor does it describe specific transaction plans or timing in the provided excerpt.
What voting rights are associated with the reported TGEN shares?
The Schedule 13G shows Portolan Capital has sole voting power and sole dispositive power over the 1,552,232 shares reported. Shared voting or dispositive power is shown as 0 in the filing.
