Tecogen Inc. (TGEN) Stock Price History
Historical prices from 2014 to 2026
- 1M
- -15.8%
- 3M
- +112.6%
- YTD
- -2.1%
- 1Y
- -23.1%
- 3Y
- +74.2%
- 5Y
- +22.8%
Loading 10-year price history...
TGEN Historical Performance
TGEN Annual Returns
Year-by-year price performance · 2014–2026
- 2014 annual price return
- -18.1%
- 2015 annual price return
- -30.1%
- 2016 annual price return
- +26.5%
- 2017 annual price return
- -31.5%
- 2018 annual price return
- +38.5%
- 2019 annual price return
- -42.7%
- 2020 annual price return
- -43.4%
- 2021 annual price return
- -4.0%
- 2022 annual price return
- +8.7%
- 2023 annual price return
- -35.2%
- 2024 annual price return
- +88.5%
- 2025 annual price return
- +218.7%
- 2026 annual price return
- -35.0%
TGEN Stock Price Trajectory (2014–2026)
As of June 29, 2026, Tecogen Inc. (TGEN) trades at $5.23, representing a -23.1% return over the past year. The stock has delivered a +194.0% total return over five years (+22.8% CAGR), reflecting significant long-term value creation.
The stock reached its all-time high of $31.31 on May 22, 2014. From this peak, TGEN has corrected -83.3%, currently trading 7% below its 200-day moving average, suggesting potential weakness.
When compared to Industrials sector peers CDTX (+354.5% 1Y), PESI (+24.8% 1Y), and AMTX (-31.9% 1Y), TGEN has underperformed the peer group average. Compare TGEN vs CDTX →
TGEN Historical Price Data · from 2014
Rows 1–50 of 3,039| Date | Open | High | Low | Close | Volume | Change % |
|---|---|---|---|---|---|---|
| 2026-06-29 | 5.18 | 5.42 | 4.98 | 5.23 | 44K | +1.16% |
| 2026-06-26 | 5.10 | 5.34 | 4.95 | 5.17 | 64K | -0.58% |
| 2026-06-25 | 5.50 | 5.76 | 5.09 | 5.20 | 338K | -3.35% |
| 2026-06-24 | 5.84 | 5.95 | 5.31 | 5.38 | 259K | -5.94% |
| 2026-06-23 | 5.79 | 6.27 | 5.70 | 5.72 | 265K | -5.45% |
| 2026-06-22 | 6.06 | 6.35 | 6.00 | 6.05 | 187K | +0.33% |
| 2026-06-18 | 6.00 | 6.17 | 5.86 | 6.03 | 168K | +4.33% |
| 2026-06-17 | 5.77 | 6.19 | 5.71 | 5.78 | 199K | +1.23% |
| 2026-06-16 | 5.70 | 6.08 | 5.55 | 5.71 | 162K | +0.53% |
| 2026-06-15 | 6.05 | 6.18 | 5.62 | 5.68 | 215K | -0.87% |
| 2026-06-12 | 5.67 | 5.95 | 5.53 | 5.73 | 195K | +0.35% |
| 2026-06-11 | 5.38 | 5.71 | 5.21 | 5.71 | 238K | +7.33% |
| 2026-06-10 | 5.59 | 5.85 | 5.25 | 5.32 | 238K | -6.17% |
| 2026-06-09 | 6.19 | 6.34 | 5.30 | 5.67 | 611K | -6.90% |
| 2026-06-08 | 6.15 | 6.36 | 6.00 | 6.09 | 343K | +6.10% |
| 2026-06-05 | 7.04 | 7.19 | 5.70 | 5.74 | 541K | -16.81% |
| 2026-06-04 | 6.69 | 7.43 | 6.40 | 6.90 | 378K | +1.17% |
| 2026-06-03 | 6.50 | 7.01 | 6.32 | 6.82 | 442K | +5.57% |
| 2026-06-02 | 6.85 | 6.90 | 6.42 | 6.46 | 410K | -5.83% |
| 2026-06-01 | 6.04 | 6.95 | 6.02 | 6.86 | 515K | +10.47% |
| 2026-05-29 | 6.37 | 6.42 | 5.90 | 6.21 | 256K | -2.51% |
| 2026-05-28 | 6.40 | 6.72 | 6.27 | 6.37 | 324K | -3.04% |
| 2026-05-27 | 6.09 | 6.98 | 6.00 | 6.57 | 892K | +8.60% |
| 2026-05-26 | 5.80 | 6.39 | 5.75 | 6.05 | 535K | +5.40% |
| 2026-05-22 | 5.56 | 5.83 | 5.50 | 5.74 | 4K | +3.99% |
| 2026-05-21 | 5.29 | 5.54 | 5.29 | 5.52 | 174K | +4.15% |
| 2026-05-20 | 5.46 | 5.84 | 5.16 | 5.30 | 441K | -1.12% |
| 2026-05-19 | 6.08 | 6.11 | 5.35 | 5.36 | 554K | -15.59% |
| 2026-05-18 | 6.52 | 7.18 | 6.25 | 6.35 | 859K | -2.61% |
| 2026-05-15 | 5.99 | 6.64 | 5.55 | 6.52 | 1.11M | +4.82% |
| 2026-05-14 | 5.13 | 6.32 | 5.04 | 6.22 | 1.78M | +22.68% |
| 2026-05-13 | 3.85 | 5.19 | 3.85 | 5.07 | 1.92M | +19.86% |
| 2026-05-12 | 4.32 | 4.32 | 4.06 | 4.23 | 370K | -3.20% |
| 2026-05-11 | 3.67 | 4.59 | 3.65 | 4.37 | 177K | -5.62% |
| 2026-05-08 | 4.80 | 4.89 | 4.52 | 4.63 | 461K | -3.94% |
| 2026-05-07 | 5.22 | 5.29 | 4.71 | 4.82 | 362K | -9.91% |
| 2026-05-06 | 5.00 | 5.52 | 4.91 | 5.35 | 417K | +8.30% |
| 2026-05-05 | 4.98 | 5.00 | 4.60 | 4.94 | 269K | +0.41% |
| 2026-05-04 | 4.78 | 5.08 | 4.78 | 4.92 | 379K | -0.61% |
| 2026-05-01 | 4.78 | 5.20 | 4.77 | 4.95 | 528K | +3.56% |
| 2026-04-30 | 4.06 | 5.07 | 3.96 | 4.78 | 1.14M | +18.32% |
| 2026-04-29 | 4.23 | 4.25 | 3.96 | 4.04 | 207K | -3.81% |
| 2026-04-28 | 4.13 | 4.21 | 3.80 | 4.20 | 289K | +0.48% |
| 2026-04-27 | 4.27 | 4.39 | 4.10 | 4.18 | 134K | -2.56% |
| 2026-04-24 | 4.15 | 4.40 | 4.02 | 4.29 | 177K | +2.88% |
| 2026-04-23 | 4.28 | 4.42 | 3.93 | 4.17 | 362K | -3.47% |
| 2026-04-22 | 4.62 | 4.72 | 4.12 | 4.32 | 515K | -2.92% |
| 2026-04-21 | 4.94 | 4.94 | 4.36 | 4.45 | 548K | -8.62% |
| 2026-04-20 | 4.27 | 5.00 | 4.12 | 4.87 | 1.39M | +13.26% |
| 2026-04-17 | 3.95 | 4.47 | 3.86 | 4.30 | 1.20M | +11.11% |
Intrinsic Valuation
DCF models, multiple analysis, and analyst estimates.
Historical Returns
10-year return with dividends reinvested.
DCA Calculator
See how regular investing compounds over time.
Peer Comparison
Compare growth, multiples, and margins vs sector.
TGEN — Frequently Asked Questions
Quick answers to the most common questions about buying TGEN stock.
How has TGEN stock performed recently?
TGEN declined -23.1% over the past year, below its 5-year annualized CAGR of +22.8%. The stock trades below its 200-day moving average, reflecting the downtrend.
What is TGEN's all-time high price?
Tecogen Inc. reached $31.31 on 2014-05-22. The 52-week high is $12.07. Current 1-year return of -23.1% places the stock further from historical peaks.
Where can I download TGEN historical price data?
This page provides TGEN daily OHLCV data with 50-day MA, 200-day MA, and RSI indicators. Data spans 2014-2026, downloadable in CSV format.