Vault-13

TECOGEN INC NEW TGEN

COM NEW · Common Stock · CUSIP 87876P201

69 institutional holders +7 vs Q1 2026
9,479,7169.5m shares reported held*
31.4% of all shares outstanding*
$49.5mreported value*
20 new 18 added 15 reduced 13 sold out net bought ≈ $8.8m (+1.7m shares)

* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($8.3k this quarter). Holder counts are more reliable. Shares outstanding: 30.2m as of 2026-08-13, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $5.22. Options: 8 managers hold calls ($6.7m notional), 6 hold puts ($2.8m).

Trends to Q2 2026

Institutional holders

Managers reporting a position, each quarter

0255075Q3 22: 1Q4 22: 1Q1 23: 1Q2 23: 1Q3 23: 1Q4 23: 1Q1 24: 0Q2 24: 0Q3 24: 0Q4 24: 0Q1 25: 1Q2 25: 31Q3 25: 70Q4 25: 65Q1 26: 62Q2 26: 6969Q3 22Q3 23Q3 24Q3 25Q2 26
Numbers
QuarterHolders
Q3 20221
Q4 20221
Q1 20231
Q2 20231
Q3 20231
Q4 20231
Q1 20240
Q2 20240
Q3 20240
Q4 20240
Q1 20251
Q2 202531
Q3 202570
Q4 202565
Q1 202662
Q2 202669

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
1000100Q3 23: 0 bought or addedQ3 23: 0 cut or sold outQ4 23: 0 bought or addedQ4 23: 0 cut or sold outQ4 23Q1 24: 0 bought or addedQ1 24: 1 cut or sold outQ2 25: 30 bought or addedQ2 25: 0 cut or sold outQ2 25Q3 25: 57 bought or addedQ3 25: 8 cut or sold outQ4 25: 37 bought or addedQ4 25: 36 cut or sold outQ4 25Q1 26: 28 bought or addedQ1 26: 36 cut or sold outQ2 26: 38 bought or addedQ2 26: 28 cut or sold outQ2 26
Numbers
QuarterBought or addedCut or sold out
Q3 202300
Q4 202300
Q1 202401
Q2 2025300
Q3 2025578
Q4 20253736
Q1 20262836
Q2 20263828

Calls vs puts

Options held, notional value, last 4 quarters. P/C = puts ÷ calls

CallsPuts
$0$2m$4m$6m$8mQ3 25 calls: $3.3mQ3 25 puts: $6.3mQ3 25P/C 1.93Q4 25 calls: $2.6mQ4 25 puts: $1.6mQ4 25P/C 0.63Q1 26 calls: $1.6mQ1 26 puts: $710.7kQ1 26P/C 0.45Q2 26 calls: $6.7mQ2 26 puts: $2.8mQ2 26P/C 0.41
Numbers
QuarterCallsPutsP/C
Q3 2025$3.3m$6.3m1.93
Q4 2025$2.6m$1.6m0.63
Q1 2026$1.6m$710.7k0.45
Q2 2026$6.7m$2.8m0.41

Biggest buyers

Portolan Capital Management, LLC Added +1,107,558+1.1m
GRATIA CAPITAL, LLC New +388,660+388.7k
MORGAN STANLEY Added +224,959+225.0k
Huntleigh Advisors, Inc. New +220,074+220.1k
SUSQUEHANNA INTERNATIONAL GROUP, LLP Added +206,374+206.4k
HEARTLAND ADVISORS INC New +182,100+182.1k
RAYMOND JAMES FINANCIAL INC Added +104,466+104.5k
CITADEL ADVISORS LLC Added +94,804+94.8k
BlackRock, Inc. Added +66,685+66.7k
Meros Investment Management, LP Added +61,782+61.8k

Biggest sellers

RENAISSANCE TECHNOLOGIES LLC Sold out -272,300-272.3k
Arosa Capital Management LP Reduced -225,000-225.0k
GENDELL JEFFREY L Reduced -195,718-195.7k
MARSHALL WACE, LLP Reduced -152,661-152.7k
Integrated Wealth Concepts LLC Reduced -106,300-106.3k
HighTower Advisors, LLC Reduced -93,165-93.2k
Granahan Investment Management, LLC Sold out -88,496-88.5k
JANE STREET GROUP, LLC Reduced -68,255-68.3k
TWO SIGMA INVESTMENTS, LP Sold out -67,418-67.4k
LPL Financial LLC Sold out -41,251-41.3k

Biggest calls

PEAK6 LLC New $2.5m471.9k shares
JANE STREET GROUP, LLC Added $1.6m303.8k shares
CITADEL ADVISORS LLC Reduced $1.1m219.1k shares
SUSQUEHANNA INTERNATIONAL GROUP, LLP Reduced $685.4k131.3k shares
GROUP ONE TRADING LLC Added $465.6k89.2k shares
SIMPLEX TRADING, LLC Added $226.0k43.3k shares
IMC-Chicago, LLC Reduced $75.2k14.4k shares
Belvedere Trading LLC New $42.3k8.1k shares

Biggest puts

IMC-Chicago, LLC Added $847.7k162.4k shares
CITADEL ADVISORS LLC Added $648.3k124.2k shares
SUSQUEHANNA INTERNATIONAL GROUP, LLP Added $462.0k88.5k shares
JANE STREET GROUP, LLC Added $424.9k81.4k shares
SIMPLEX TRADING, LLC Added $238.6k45.7k shares
GROUP ONE TRADING LLC Added $130.5k25.0k shares

Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.

Major shareholders (over 5%)

Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.

HolderStakeChangeShares Last filed
Portolan Capital Management, LLC 13G · passive investor new · filed 2026-06-10 5.2% new 1.6m≈ $8.1m 2026-06-10

Insider purchases and sales since 1 Apr 2026

Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.

Officers and directors buying vs selling

Number of people, by quarter (10% owners not included)

BuyingSelling
505Q4 24: 0 buyingQ4 24: 0 sellingQ1 25: 1 buyingQ1 25: 0 sellingQ1 25Q2 25: 0 buyingQ2 25: 2 sellingQ3 25: 0 buyingQ3 25: 0 sellingQ3 25Q4 25: 0 buyingQ4 25: 0 sellingQ1 26: 5 buyingQ1 26: 0 sellingQ1 26Q2 26: 2 buyingQ2 26: 0 sellingQ3 26: 0 buyingQ3 26: 0 sellingQ3 26
Numbers
QuarterBuyingBoughtSellingSoldSold under a plan
Q4 20240—0——
Q1 20251$1.0k0——
Q2 20250—2$896.6k—
Q3 20250—0——
Q4 20250—0——
Q1 20265$105.4k0——
Q2 20262$18.6k0——
Q3 20260—0——
DateInsiderTradeSharesPrice ValueTheir holding
2026-04-24 Ghoniem Ahmed Director Bought 12,723 — —12.7k shares new
2026-04-13 Hirsch Susan B Director Bought 5,000 $3.73 $18.6k5.0k shares +2%

Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).

Holders, Q2 2026

#ManagerLocationShares Value% of their portfolioChangeShares change
1 Portolan Capital Management, LLC 0.30% of their portfolio BOSTON, MA 1,551,1131.6m $8.1m $8.1m 0.30% Added +1.1m +1,107,558
2 VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio MALVERN, PA 788,670788.7k $4.1m $4.1m 0.00% Added +18.7k +18,706
3 BARD ASSOCIATES INC 0.79% of their portfolio CHICAGO, IL 682,221682.2k $3.6m $3.6m 0.79% Reduced -6.1k -6,088
4 Clear Harbor Asset Management, LLC 0.21% of their portfolio Stamford, CT 650,000650.0k $3.4m $3.4m 0.21% Unchanged
5 HERALD INVESTMENT MANAGEMENT Ltd 0.30% of their portfolio LONDON, X0 420,000420.0k $2.2m $2.2m 0.30% Unchanged
6 GRATIA CAPITAL, LLC 2.33% of their portfolio LOS ANGELES, CA 388,660388.7k $2.0m $2.0m 2.33% New
7 UBS Group AG 0.00% of their portfolio ZURICH, V8 363,049363.0k $1.9m $1.9m 0.00% Added +43.2k +43,213
8 Meros Investment Management, LP 0.59% of their portfolio DALLAS, TX 353,487353.5k $1.8m $1.8m 0.59% Added +61.8k +61,782
9 Palisades Investment Partners, LLC 0.48% of their portfolio SANTA MONICA, CA 323,090323.1k $1.7m $1.7m 0.48% Reduced -10.8k -10,817
10 SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio BALA CYNWYD, PA 315,831315.8k $1.6m $1.6m 0.00% Added +206.4k +206,374
11 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 301,695301.7k $1.6m $1.6m 0.00% Added +225.0k +224,959
12 RAYMOND JAMES FINANCIAL INC 0.00% of their portfolio ST. PETERSBURG, FL 290,260290.3k $1.5m $1.5m 0.00% Added +104.5k +104,466
13 BlackRock, Inc. 0.00% of their portfolio New York, NY 251,464251.5k $1.3m $1.3m 0.00% Added +66.7k +66,685
14 CITADEL ADVISORS LLC 0.00% of their portfolio MIAMI, FL 242,276242.3k $1.3m $1.3m 0.00% Added +94.8k +94,804
15 Huntleigh Advisors, Inc. 0.16% of their portfolio ST. LOUIS, MO 220,074220.1k $1.1m $1.1m 0.16% New
16 HEARTLAND ADVISORS INC 0.04% of their portfolio MILWAUKEE, WI 182,100182.1k $950.6k $950.6k 0.04% New
17 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 180,870180.9k $944.8k $944.8k 0.00% Reduced -11.1k -11,132
18 THOMPSON DAVIS & CO., INC. 0.45% of their portfolio RICHMOND, VA 144,840144.8k $755.9k $755.9k 0.45% Added +45.8k +45,840
19 NEW YORK STATE COMMON RETIREMENT FUND 0.00% of their portfolio ALBANY, NY 137,200137.2k $716.2k $716.2k 0.00% Unchanged
20 GSA CAPITAL PARTNERS LLP 0.04% of their portfolio LONDON, X0 126,451126.5k $660.0k $660.0k 0.04% Added +32.3k +32,281
21 Arosa Capital Management LP 0.57% of their portfolio MIAMI BEACH, FL 125,000125.0k $652.5k $652.5k 0.57% Reduced -225.0k -225,000
22 Integrated Wealth Concepts LLC 0.00% of their portfolio WALTHAM, MA 112,080112.1k $585.1k $585.1k 0.00% Reduced -106.3k -106,300
23 Apis Capital Advisors, LLC 0.06% of their portfolio New York, NY 112,000112.0k $584.6k $584.6k 0.06% Added +35.0k +35,000
24 VANGUARD FIDUCIARY TRUST CO 0.00% of their portfolio MALVERN, PA 105,956106.0k $553.1k $553.1k 0.00% Added +9.5k +9,514
25 GOLDMAN SACHS GROUP INC 0.00% of their portfolio NEW YORK, NY 69,53069.5k $362.9k $362.9k 0.00% Added +44.4k +44,424
26 STATE STREET CORP 0.00% of their portfolio BOSTON, MA 69,22669.2k $361.4k $361.4k 0.00% Unchanged
27 Diametric Capital, LP 0.04% of their portfolio BOSTON, MA 66,32666.3k $346.2k $346.2k 0.04% Added +13.2k +13,195
28 PFG Investments, LLC 0.01% of their portfolio WOODBURY, NY 62,52362.5k $326.4k $326.4k 0.01% Unchanged
29 IMC-Chicago, LLC 0.00% of their portfolio CHICAGO, IL 61,80061.8k $322.6k $322.6k 0.00% Added +48.1k +48,150
30 HRT FINANCIAL LP 0.00% of their portfolio NEW YORK, NY 59,28559.3k $309.0k $309.0k 0.00% Added +44.2k +44,214
31 CORSAIR CAPITAL MANAGEMENT, L.P. 0.04% of their portfolio NEW YORK, NY 55,01755.0k $287.2k $287.2k 0.04% Unchanged
32 MARSHALL WACE, LLP 0.00% of their portfolio LONDON, X0 54,80654.8k $286.1k $286.1k 0.00% Reduced -152.7k -152,661
33 SHIKIAR ASSET MANAGEMENT INC 0.07% of their portfolio NEW YORK, NY 54,05054.0k $282.0k $282.0k 0.07% Added +36.4k +36,400
34 GROUP ONE TRADING LLC 0.01% of their portfolio CHICAGO, IL 49,87249.9k $260.3k $260.3k 0.01% Reduced -34.0k -34,050
35 GENDELL JEFFREY L 0.00% of their portfolio Greenwich, CT 49,82349.8k $260.1k $260.1k 0.00% Reduced -195.7k -195,718
36 JANE STREET GROUP, LLC 0.00% of their portfolio NEW YORK, NY 49,08749.1k $256.2k $256.2k 0.00% Reduced -68.3k -68,255
37 GAMCO INVESTORS, INC. ET AL 0.00% of their portfolio GREENWICH, CT 40,00040.0k $208.8k $208.8k 0.00% Unchanged
38 HighTower Advisors, LLC 0.00% of their portfolio CHICAGO, IL 39,50039.5k $206.2k $206.2k 0.00% Reduced -93.2k -93,165
39 NORTHERN TRUST CORP 0.00% of their portfolio CHICAGO, IL 37,56937.6k $196.1k $196.1k 0.00% Reduced -112 -112
40 BRIDGEWAY CAPITAL MANAGEMENT, LLC 0.00% of their portfolio HOUSTON, TX 33,04833.0k $172.5k $172.5k 0.00% Unchanged
41 XTX Topco Ltd 0.00% of their portfolio LONDON, X0 32,41132.4k $169.2k $169.2k 0.00% New
42 Centiva Capital, LP 0.00% of their portfolio New York, NY 27,52827.5k $143.7k $143.7k 0.00% New
43 Crewe Advisors LLC 0.01% of their portfolio SALT LAKE CITY, UT 23,00023.0k $120.1k $120.1k 0.01% New
44 GABELLI FUNDS LLC 0.00% of their portfolio Rye, NY 20,00020.0k $104.4k $104.4k 0.00% Unchanged
45 Jefferies Financial Group Inc. 0.00% of their portfolio NEW YORK, NY 19,30019.3k $100.7k $100.7k 0.00% New
46 Pathstone Holdings, LLC 0.00% of their portfolio ENGLEWOOD, NJ 18,72518.7k $97.7k $97.7k 0.00% Unchanged
47 Virtu Financial LLC 0.00% of their portfolio New York, NY 16,37716.4k $85.0k $85.0k 0.00% New
48 D. E. Shaw & Co., Inc. 0.00% of their portfolio New York, NY 15,33915.3k $80.1k $80.1k 0.00% New
49 Belvedere Trading LLC 0.01% of their portfolio CHICAGO, IL 15,20615.2k $79.4k $79.4k 0.01% New
50 Quadrature Capital Ltd 0.00% of their portfolio LONDON, X0 14,06114.1k $73.4k $73.4k 0.00% New
51 COMMONWEALTH EQUITY SERVICES, LLC 0.00% of their portfolio WALTHAM, MA 13,62413.6k $71.1k $71.1k 0.00% Reduced -2.5k -2,500
52 Wealthspire Advisors, LLC 0.00% of their portfolio NEW YORK, NY 11,71111.7k $61.1k $61.1k 0.00% New
53 DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio AUSTIN, TX 11,16311.2k $58.3k $58.3k 0.00% Unchanged
54 CITIZENS FINANCIAL GROUP INC/RI 0.00% of their portfolio PROVIDENCE, RI 10,00010.0k $52.2k $52.2k 0.00% Unchanged
55 Vanguard Global Advisers, LLC 0.00% of their portfolio MALVERN, PA 5,4345.4k $28.4k $28.4k 0.00% Unchanged
56 Persistent Asset Partners Ltd 0.00% of their portfolio HONG KONG, K3 2,2712.3k $11.9k $11.9k 0.00% New
57 CITIGROUP INC 0.00% of their portfolio NEW YORK, NY 1,6021.6k $8.4k $8.4k 0.00% New
58 UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio NEW YORK, NY 1,5831.6k $8.3k $8.3k 0.00% Unchanged
59 Federation des caisses Desjardins du Quebec 0.00% of their portfolio LEVIS, A8 562562 $2.9k $2.9k 0.00% Unchanged
60 SIMPLEX TRADING, LLC 0.00% of their portfolio CHICAGO, IL 479479 $2.5k $2.5k 0.00% Reduced -40.9k -40,853
61 NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO 0.00% of their portfolio MILWAUKEE, WI 266266 $1.4k $1.4k 0.00% New
62 ROYAL BANK OF CANADA 0.00% of their portfolio TORONTO, A6 227227 $1.0k $1.0k 0.00% Reduced -2.9k -2,916
63 Fortitude Family Office, LLC 0.00% of their portfolio SCOTTSDALE, AZ 181181 $945 $945 0.00% Unchanged
64 Bogart Wealth, LLC 0.00% of their portfolio MCLEAN, VA 118118 $616 $616 0.00% New
65 SBI Securities Co., Ltd. 0.00% of their portfolio TOKYO, M0 110110 $574 $574 0.00% Reduced -10 -10
66 Bare Financial Services, Inc 0.00% of their portfolio GAP, PA 103103 $538 $538 0.00% New
67 FMR LLC 0.00% of their portfolio BOSTON, MA 5353 $279 $279 0.00% New
68 HOLLENCREST CAPITAL MANAGEMENT 0.00% of their portfolio NEWPORT BEACH, CA 1515 $78 $78 0.00% New
69 Caitong International Asset Management Co., Ltd 0.00% of their portfolio HONG KONG, K3 11 $5 $5 0.00% New