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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
Aug 19, 2021 (view filing)Aug 172 daysLewis Earl RDirectorPPurchase+15.0K$1.86+$27.9K+6.0%265.0K after2 lots
Aug 23, 2022 (view filing)Aug 221 dayHatsopoulos JohnDirectorPPurchase+5.00K$1.21+$6.05K+2.1%244.9K after
Aug 25, 2022 (view filing)Aug 23-252 daysHatsopoulos JohnDirectorPPurchase+15.0K$1.24+$18.7K+6.1%259.9K after4 lots
Aug 30, 2022 (view filing)Aug 26-304 daysHatsopoulos JohnDirectorPPurchase+15.0K$1.20+$18.1K+5.8%274.9K after3 lots
Sep 2, 2022 (view filing)Aug 31-Sep 22 daysHatsopoulos JohnDirectorPPurchase+15.0K$1.10+$16.5K+5.5%289.9K after3 lots
Sep 12, 2022 (view filing)Sep 84 daysHatsopoulos JohnDirectorPPurchase+5.00K$1.17+$5.85K+1.7%294.9K after
Sep 29, 2022 (view filing)Sep 28-291 dayLewis Earl RDirectorPPurchase+13.2K$0.9576+$12.6K+3.2%428.2K after2 lots
Oct 12, 2022 (view filing)Oct 10-112 daysHatsopoulos JohnDirectorPPurchase+10.0K$0.96+$9.60K+3.4%304.9K after2 lots
Oct 18, 2022 (view filing)Oct 171 dayHatsopoulos JohnDirectorPPurchase+5.00K$0.98+$4.90K+1.6%309.9K after
Oct 19, 2022 (view filing)Oct 19Same dayHatsopoulos JohnDirectorPPurchase+5.00K$1.00+$5.00K+1.6%314.9K after
Mar 21, 2023 (view filing)Mar 201 dayHatsopoulos JohnDirectorPPurchase+10.0K$0.84+$8.40K+3.2%324.9K after
Mar 21, 2023 (view filing)Mar 201 dayLewis Earl RDirectorPPurchase+15.0K$0.89+$13.3K+3.5%443.2K after2 lots
Mar 21, 2023 (view filing)Mar 21Same dayHatsopoulos JohnDirectorPPurchase+10.0K$0.88+$8.80K+3.1%334.9K after
Mar 23, 2023 (view filing)Mar 221 dayLewis Earl RDirectorPPurchase+5.00K$0.87+$4.35K+1.1%448.2K after
Mar 24, 2023 (view filing)Mar 24Same dayHatsopoulos JohnDirectorPPurchase+50.0K$0.92+$46.0K+14.9%384.9K after
Mar 27, 2023 (view filing)Mar 207 daysLateRangesh AbinandChief Executive OfficerPPurchase+1.80K$0.8778+$1.58K+30.0%7.80K after2 lots
Mar 27, 2023 (view filing)Mar 27Same dayHatsopoulos JohnDirectorPPurchase+11.4K$1.00+$11.4K+3.0%396.3K after
Mar 29, 2023 (view filing)Mar 281 dayHatsopoulos JohnDirectorPPurchase+17.7K$1.00+$17.7K+4.5%414.0K after
Mar 30, 2023 (view filing)Mar 24-296 daysLateLewis Earl RDirectorPPurchase+35.0K$1.09+$38.0K+7.8%483.2K after8 lots
May 16, 2023 (view filing)May 151 dayLewis Earl RDirectorPPurchase+10.0K$0.96+$9.60K+2.1%493.2K after
May 16, 2023 (view filing)May 151 dayHatsopoulos JohnDirectorPPurchase+3.65K$1.00+$3.65K+0.9%417.6K after
May 26, 2023 (view filing)May 23-253 daysLateHatsopoulos JohnDirectorPPurchase+2.00K$1.17+$2.34K+0.5%419.6K after2 lots
May 26, 2023 (view filing)May 26Same dayHatsopoulos JohnDirectorPPurchase+1.00K$1.17+$1.17K+0.2%420.6K after
Jun 5, 2023 (view filing)Jun 23 daysHatsopoulos JohnDirectorPPurchase+1.00K$1.09+$1.09K+0.2%421.6K after
Jun 6, 2023 (view filing)Jun 6Same dayHatsopoulos JohnDirectorPPurchase+1.00K$1.14+$1.14K+0.2%422.6K after
Jun 7, 2023 (view filing)Jun 61 dayHatsopoulos JohnDirectorPPurchase+7.00K$1.00+$7.00K+1.7%429.6K after
Jun 8, 2023 (view filing)Jun 71 dayHatsopoulos JohnDirectorPPurchase+10.0K$1.00+$10.0K+2.3%439.6K after2 lots
Jun 9, 2023 (view filing)Jun 81 dayHatsopoulos JohnDirectorPPurchase+500$1.09+$545+0.1%440.1K after
Jun 12, 2023 (view filing)Jun 12Same dayHatsopoulos JohnDirectorPPurchase+5.00K$1.12+$5.60K+1.1%445.1K after
Jun 15, 2023 (view filing)Jun 15Same dayHatsopoulos JohnDirectorPPurchase+5.00K$1.11+$5.55K+1.1%450.1K after
Jun 20, 2023 (view filing)Jun 20Same dayRangesh AbinandChief Executive OfficerPPurchase+1.50K$1.04+$1.56K+19.2%9.30K after
Jun 21, 2023 (view filing)Jun 201 dayHatsopoulos JohnDirectorPPurchase+3.00K$1.00+$3.00K+0.7%453.1K after
Jun 27, 2023 (view filing)Jun 261 dayHatsopoulos JohnDirectorPPurchase+1.00K$0.96+$960+0.2%454.1K after
Aug 17, 2023 (view filing)Aug 143 daysLateLewis Earl RDirectorPPurchase+1.50K$1.00+$1.50K+0.3%494.7K after
Aug 17, 2023 (view filing)Aug 15-172 daysHatsopoulos JohnDirectorPPurchase+9.67K$1.02+$9.86K+2.1%463.8K after2 lots
Aug 23, 2023 (view filing)Aug 221 dayHatsopoulos JohnDirectorPPurchase+5.00K$1.12+$5.60K+1.1%468.8K after
Sep 1, 2023 (view filing)Aug 15-3017 daysLateRangesh AbinandChief Executive OfficerPPurchase+1.00K$1.02+$1.02K+10.8%10.3K after3 lots
Sep 6, 2023 (view filing)Sep 51 dayHatsopoulos JohnDirectorPPurchase+10.0K$0.97+$9.70K+2.1%478.8K after
Sep 6, 2023 (view filing)Sep 51 dayLewis Earl RDirectorPPurchase+10.0K$1.00+$10.0K+2.0%504.7K after
Sep 8, 2023 (view filing)Sep 71 dayHatsopoulos JohnDirectorPPurchase+200$1.00+$2000.0%479.0K after
Sep 11, 2023 (view filing)Sep 83 daysLewis Earl RDirectorPPurchase+10.0K$0.95+$9.50K+2.0%514.7K after
Sep 19, 2023 (view filing)Sep 19Same dayHatsopoulos JohnDirectorPPurchase+5.00K$0.91+$4.55K+1.0%484.0K after
Sep 27, 2023 (view filing)Sep 261 dayHatsopoulos JohnDirectorPPurchase+2.00K$0.92+$1.84K+0.4%486.0K after
Sep 28, 2023 (view filing)Sep 271 dayHatsopoulos JohnDirectorPPurchase+1.38K$0.91+$1.26K+0.3%487.4K after
Oct 2, 2023 (view filing)Sep 293 daysHatsopoulos JohnDirectorPPurchase+2.00K$0.98+$1.96K+0.4%489.4K after
Oct 11, 2023 (view filing)Oct 92 daysLewis Earl RDirectorPPurchase+2.00K$0.80+$1.60K+0.4%516.7K after
Oct 13, 2023 (view filing)Oct 121 dayHatsopoulos JohnDirectorPPurchase+50.0K$0.80+$40.0K+10.2%539.4K after
Oct 17, 2023 (view filing)Oct 17Same dayHatsopoulos JohnDirectorPPurchase+50.0K$0.80+$40.0K+9.3%589.4K after
Oct 18, 2023 (view filing)Oct 18Same dayLewis Earl RDirectorPPurchase+25.0K$0.91+$22.8K+4.8%541.7K after
Oct 20, 2023 (view filing)Oct 191 dayHirsch Susan BDirectorPPurchase+5.00K$0.92+$4.60K+2.0%250.4K after