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Tecogen Inc.

TGEN
Exchange
NYSE
Industry
Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip
SEC CIK
0001537435

No open-market purchases or sales by Tecogen Inc. insiders were filed in the last 90 days; 69 institutions reported holding it in 13F filings for Q2 2026, worth $49.5M in total; no superinvestor holds it.

Open-market trades, last 90 days

Open-market purchases (P) and sales (S) by Tecogen Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.

Open-market buys
0 filings
Open-market sells
0 filings
Insiders trading
0
Net value
$0
Purchases minus sales

Insider roster

Directors, officers and 10% owners who have filed a Form 4 for Tecogen Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.

Insider roster for Tecogen Inc.
NameTitleLast reported holdingLast filingFilings, past year
Lafaille StephenVP of Business Development41,389Sep 8, 20261
Whiting John Kimball IVGeneral Counsel & Secretary41,954Sep 8, 20262
Panora Robert ACOO and President72,194Sep 8, 20261
Deschenes Roger P.Chief Financial Officer81,975Sep 8, 20262
Rangesh AbinandChief Executive Officer241,274Sep 8, 20262
Albertine John MDirector–Jun 30, 20261
Lewis Earl RDirector1,006,006Jun 30, 20263
Ghoniem AhmedDirector12,723Jun 30, 20262
Galiteva AngelinaDirector–Jun 30, 20261
Hirsch Susan BDirector265,416Jun 30, 20263
Hatsopoulos JohnDirector1,038,951Mar 23, 20261
Holubow FredDirector–Jun 15, 20230
Jenkins RalphDirector–Jun 28, 20220

Insider trades

Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Apr 27, 2026 (view filing)Apr 243 daysGhoniem AhmedDirectorPPurchase+12.7K$0.79+$10.1KNew position12.7K after
Apr 14, 2026 (view filing)Apr 131 dayHirsch Susan BDirectorPPurchase+5.00K$3.73+$18.6K+1.9%265.4K after
Mar 27, 2026 (view filing)Mar 27Same dayHirsch Susan BDirectorPPurchase+10.0K$2.54+$25.4K+4.0%260.4K after
Mar 27, 2026 (view filing)Mar 261 dayLewis Earl RDirectorPPurchase+5.00K$2.88+$14.4K+0.5%1.01M after
Mar 27, 2026 (view filing)Mar 27Same dayLewis Earl RDirectorPPurchase+5.00K$2.52+$12.6K+0.5%1.01M after
Mar 23, 2026 (view filing)Mar 23Same dayWhiting John Kimball IVGeneral Counsel & SecretaryPPurchase+10.0K$2.38+$23.8K+79.3%22.6K after
Mar 23, 2026 (view filing)Mar 203 daysDeschenes Roger P.CAOPPurchase+10.0K$2.23+$22.3K+23.3%53.0K after
Mar 23, 2026 (view filing)Mar 203 daysRangesh AbinandChief Executive OfficerPPurchase+3.00K$2.30+$6.90K+4.7%67.2K after
Jul 14, 2025 (view filing)Jun 3-2441 daysPanora Robert ACOO and PresidentSSale−102.7K$5.36−$550.8K−62.2%62.5K afterAmended5 lots
Jun 24, 2025 (view filing)Mar 3113 daysLateLafaille StephenVP of Business DevelopmentPPurchase+400$2.50+$1.00KNew position400 after
Jun 24, 2025 (view filing)Jun 3-2321 daysLateLafaille StephenVP of Business DevelopmentSSale−60.0K$5.76−$345.8K−99.3%400 after4 lots
Mar 25, 2025 (view filing)Oct 9, 2023533 daysLewis Earl RDirectorPPurchase+2.00K$0.80+$1.60K+0.3%627.0K afterAmended
Mar 25, 2025 (view filing)Jul 15, 2024253 daysLewis Earl RDirectorPPurchase+10.0K$0.68+$6.80K+1.6%625.0K afterAmendedDuplicate filing
Sep 27, 2024 (view filing)Sep 27Same dayHatsopoulos JohnDirectorPPurchase+10.0K$0.84+$8.40K+1.0%989.0K after
Sep 25, 2024 (view filing)Sep 25Same dayHatsopoulos JohnDirectorPPurchase+10.0K$0.86+$8.60K+1.0%979.0K after
Aug 20, 2024 (view filing)Aug 191 dayHatsopoulos JohnDirectorPPurchase+10.0K$0.90+$9.00K+1.0%969.0K after
Jul 15, 2024 (view filing)Jul 15Same dayLewis Earl RDirectorPPurchase+10.0K$0.68+$6.80K+1.6%625.0K after
Jul 12, 2024 (view filing)Jul 102 daysHatsopoulos JohnDirectorPPurchase+22.5K$0.65+$14.6K+2.4%959.0K after
May 29, 2024 (view filing)May 281 dayHatsopoulos JohnDirectorPPurchase+1.26K$0.80+$1.01K+0.1%936.5K after
May 29, 2024 (view filing)May 29Same dayHatsopoulos JohnDirectorPPurchase+10.0K$0.80+$8.00K+1.1%935.2K after
May 28, 2024 (view filing)May 22-246 daysLateHatsopoulos JohnDirectorPPurchase+11.9K$0.7973+$9.52K+1.3%925.2K after2 lots
May 22, 2024 (view filing)May 211 dayHatsopoulos JohnDirectorPPurchase+13.8K$0.79+$10.9K+1.5%913.3K after
May 17, 2024 (view filing)May 161 dayHatsopoulos JohnDirectorPPurchase+3.00K$0.75+$2.25K+0.3%899.5K after
May 16, 2024 (view filing)May 151 dayHatsopoulos JohnDirectorPPurchase+10.0K$0.74+$7.40K+1.1%896.5K after
May 3, 2024 (view filing)May 12 daysLewis Earl RDirectorPPurchase+5.00K$0.75+$3.75K+0.8%615.0K after
Apr 24, 2024 (view filing)Apr 24Same dayLewis Earl RDirectorPPurchase+10.0K$0.68+$6.80K+1.7%610.0K after
Apr 24, 2024 (view filing)Apr 24Same dayHatsopoulos JohnDirectorPPurchase+5.00K$0.67+$3.35K+0.6%886.5K after
Apr 23, 2024 (view filing)Apr 23Same dayHatsopoulos JohnDirectorPPurchase+6.00K$0.6883+$4.13K+0.7%881.5K after2 lots
Apr 16, 2024 (view filing)Apr 16Same dayHatsopoulos JohnDirectorPPurchase+1.00K$0.68+$680+0.1%875.5K after
Apr 16, 2024 (view filing)Apr 151 dayHatsopoulos JohnDirectorPPurchase+1.00K$0.70+$700+0.1%874.5K after
Apr 12, 2024 (view filing)Apr 12Same dayHatsopoulos JohnDirectorPPurchase+1.00K$0.70+$700+0.1%873.5K after
Apr 11, 2024 (view filing)Apr 11Same dayHatsopoulos JohnDirectorPPurchase+1.00K$0.70+$700+0.1%872.5K after
Apr 9, 2024 (view filing)Apr 9Same dayHatsopoulos JohnDirectorPPurchase+1.00K$0.70+$700+0.1%871.5K after
Apr 8, 2024 (view filing)Apr 8Same dayHatsopoulos JohnDirectorPPurchase+1.00K$0.70+$700+0.1%870.5K after
Apr 2, 2024 (view filing)Mar 27-Apr 16 daysLateHatsopoulos JohnDirectorPPurchase+10.0K$0.70+$7.00K+1.2%869.5K after4 lots
Jan 25, 2024 (view filing)Jan 241 dayLewis Earl RDirectorPPurchase+9.15K$0.78+$7.14K+1.7%560.8K after
Jan 23, 2024 (view filing)Jan 23Same dayLewis Earl RDirectorPPurchase+10.0K$0.68+$6.80K+1.8%551.7K after
Jan 23, 2024 (view filing)Jan 221 dayHatsopoulos JohnDirectorPPurchase+10.0K$0.77+$7.70K+1.2%859.5K after
Jan 19, 2024 (view filing)Jan 181 dayHatsopoulos JohnDirectorPPurchase+10.0K$0.73+$7.30K+1.2%849.5K after
Jan 16, 2024 (view filing)Jan 16Same dayHatsopoulos JohnDirectorPPurchase+100.0K$0.73+$73.0K+13.5%839.5K after
Dec 28, 2023 (view filing)Dec 271 dayHatsopoulos JohnDirectorPPurchase+25.0K$0.80+$20.0K+3.5%739.5K after
Dec 26, 2023 (view filing)Dec 224 daysHatsopoulos JohnDirectorPPurchase+25.0K$0.80+$20.0K+3.6%714.5K after
Dec 15, 2023 (view filing)Dec 141 dayHatsopoulos JohnDirectorPPurchase+50.0K$0.8936+$44.7K+7.8%689.5K after3 lots
Nov 21, 2023 (view filing)Nov 201 dayHatsopoulos JohnDirectorPPurchase+4.00K$0.85+$3.40K+0.6%639.5K after
Nov 17, 2023 (view filing)Nov 17Same dayHatsopoulos JohnDirectorPPurchase+46.0K$0.85+$39.1K+7.8%635.5K after
Nov 17, 2023 (view filing)Nov 143 daysLateHatsopoulos JohnDirectorPPurchase+100$0.85+$850.0%589.5K after
Oct 20, 2023 (view filing)Oct 191 dayHirsch Susan BDirectorPPurchase+5.00K$0.92+$4.60K+2.0%250.4K after
Oct 18, 2023 (view filing)Oct 18Same dayLewis Earl RDirectorPPurchase+25.0K$0.91+$22.8K+4.8%541.7K after
Oct 17, 2023 (view filing)Oct 17Same dayHatsopoulos JohnDirectorPPurchase+50.0K$0.80+$40.0K+9.3%589.4K after
Oct 13, 2023 (view filing)Oct 121 dayHatsopoulos JohnDirectorPPurchase+50.0K$0.80+$40.0K+10.2%539.4K after