Security key
87876P201
TECOGEN INC. - Common Stock, $0.001 par value per share (TGEN)
CUSIP: 87876P201
Q2 2026 13F Holders as of 30 Jun 2026
- Security type / class
- Equity / Common Stock, $0.001 par value per share
- Total 13F shares
- 1,990,495
- Total 13F value
- $10,385,765
- Share change
- +315,082
- SEC-reported price per share
- $5.22
- Number of holders
- 24
- Value change
- +$1,868,897
- Number of buys
- 14
- Number of sells
- 8
- Shares outstanding
- 29,908,131
Holder snapshot
6 signals
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q2 2026
Institutions
24
Top holders
10
TGEN full security history
Ownership snapshot
Full 13F holder table
TECOGEN INC. SEC filings
TECOGEN INC. company facts
Broader feeds
Ownership snapshot
Top reported holders of TGEN - TECOGEN INC. - Common Stock, $0.001 par value per share (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Portolan Capital Manageme...
Disclosed value leader
Portolan Capital Manageme...
Comparable rows
15/15
Latest evidence
03 Jun 2026
13D/G
13F
3/4/5
Lead comparable stake: 5.2%
13D/G row: Portolan Capital Management, LLC
Showing 1-6 of 15 holder rows.
Quick read
Portolan Capital Management, LLC leads the comparable SEC ownership view at 5.2%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Portolan Capital Management, LLC's linked filing trail.
Comparable ownership
Top 5
Portolan Capital Management, LLC
5.2%
Tryfon Natsis
1.8%
John N. Hatsopoulos
3.5%
VANGUARD CAPITAL MANAGEMENT LLC
2.6%
BARD ASSOCIATES INC
2.3%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Portolan Capital Management, LLC |
13D/G
13F
Company
|
5.2%
|
$8,304,441
1,552,232 shares
|
$0 | 03 Jun 2026 |
| Tryfon Natsis |
13D/G
Tryfon Natsis and Depoina Pantopoulou, as Joint Tenants with the Right of Survivorship
|
1.8%
|
$3,650,179
460,300 shares
|
$0 | 30 Jun 2025 |
| John N. Hatsopoulos |
3/4/5
Director
|
3.5%
|
$3,795,419
1,038,951 shares
mixed-class rows
|
— | 20 Mar 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
2.6%
|
$1,971,108
769,964 shares
|
— | 31 Mar 2026 |
| BARD ASSOCIATES INC |
13F
Company
|
2.3%
|
$1,762,072
688,309 shares
|
— | 31 Mar 2026 |
| Clear Harbor Asset Management, LLC |
13F
Company
|
2.2%
|
$1,664,000
650,000 shares
|
— | 31 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q2 2026
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
24
Shares
1,990,495
Rows available
24
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q2 2026 vs Q1 2026 Across Filers
Q1 2026 holders
62
Q2 2026 holders
24
Holder diff
-38
| Investor | Q1 2026 Shares | Q2 2026 Shares | Share Diff | Share Chg % | Q1 2026 value | Q2 2026 value | Value change | Value Chg % |
|---|