Tecogen Inc. (TGEN) P/E Ratio History
Deep ValueTrading at -16.4x · 0th percentile of 5-year range · Significant discount to historical valuation · Data 2017–2022
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P/E Ratio Analysis
As of July 8, 2026, Tecogen Inc. (TGEN) trades at a price-to-earnings ratio of -16.4x, with a stock price of $4.93 and trailing twelve-month earnings per share of $-0.33.
The current P/E is 101% below its 5-year average of 1140.5x. Over the past five years, TGEN's P/E has ranged from a low of 7.9x to a high of 4500.0x, placing the current valuation at the 0th percentile of its historical range.
Compared to the Industrials sector median P/E of 25.6x, TGEN trades at a 164% discount to its sector peers. The sector includes 399 companies with P/E ratios ranging from 0.0x to 191.5x.
Relative to the broader market, TGEN trades at a notable discount to the S&P 500 median P/E of 25.9x. Investors should consider the company's growth prospects, competitive position, and earnings quality when evaluating whether the current valuation is justified.
For a comprehensive intrinsic value estimate using discounted cash flow analysis, see our TGEN DCF Valuation Calculator →
Note: P/E ratio is just one valuation metric. It does not account for balance sheet strength, cash flow quality, or growth sustainability. Always conduct comprehensive due diligence before making investment decisions.
TGEN Cross-Benchmark Valuation
How does the current P/E compare to sector peers and the broader market?
TGEN P/E vs Peers
Grid-Scale Storage and Microgrids peers sorted by market cap
| Company | Market Cap | P/E Ratio | PEG Ratio | EPS Growth (1Y) |
|---|---|---|---|---|
| $14B | 87.7 | - | -50% | |
| $10B | 11.6Lowest | 0.15Best | -47% | |
| $23B | 24.4 | - | +20%Best |
Lower P/E can signal a discount or weaker growth expectations; PEG adds growth context.
TGEN Historical P/E Data (2017–2022)
Quarterly P/E ratios calculated from closing price and TTM EPS
| Quarter | Period End | Price | TTM EPS | P/E Ratio | vs Avg |
|---|---|---|---|---|---|
| FY2022 Q2 | - | $1.13 | $0.03 | 34.9x | -97% |
| FY2022 Q1 | - | $1.65 | $0.09 | 19.2x | -98% |
| FY2021 Q4 | Dec 31 2021 | $1.20 | $0.15 | 7.9x | -99% |
| FY2017 Q4 | Dec 31 2017 | $2.70 | $0.00 | 4500.0x | +295% |
Average P/E for displayed period: 1140.5x
Intrinsic Valuation
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Historical Returns
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Peer Comparison
Compare growth, multiples, and margins vs sector.
TGEN — Frequently Asked Questions
Quick answers to the most common questions about buying TGEN stock.
What is TGEN's P/E ratio?
Tecogen Inc. (TGEN) trailing twelve-month P/E ratio is -16.4x, based on TTM diluted EPS of $-0.33. The 5-year average P/E is 1140.5x and the historical range spans 7.9x to 4500.0x.
Is TGEN stock overvalued or undervalued?
TGEN trades at -16.4x P/E, below its 5-year average of 1140.5x. At the 0th percentile of its historical range (7.9x–4500.0x), the stock is priced at a discount to its own history.
Is TGEN stock expensive?
No, TGEN is not expensive on a historical basis. The current P/E of -16.4x is below the 5-year average of 1140.5x and sits at the 0th percentile of its valuation range.
What is TGEN's historical P/E range?
Over the past 5 years, TGEN's P/E ratio has ranged from 7.9x to 4500.0x, with a median of 34.9x and an average of 1140.5x. The current P/E of -16.4x places the stock at the 0th percentile of this range. Full historical data spans 2017–2022.
How does TGEN's P/E compare to the S&P 500?
TGEN trades at -16.4x P/E versus the S&P 500 median of 25.9x. The 163% discount to the market suggests lower growth expectations or perceived higher risk.
How does TGEN's valuation compare to Industrials peers?
Tecogen Inc. P/E of -16.4x compares to the Industrials sector median of 25.6x. The discount suggests lower growth expectations, weaker margins, or higher perceived risk relative to peers. See the peer comparison table on this page for ticker-by-ticker P/E and PEG.
What is TGEN's PEG ratio?
TGEN PEG ratio is N/A, based on a P/E of -16.4x and EPS growth of -57.9%. PEG normalises P/E by growth and helps compare stocks with different earnings trajectories.
What is TGEN's earnings yield?
TGEN earnings yield is N/A, the inverse of its -16.4x P/E ratio. Earnings yield represents the percentage of each dollar invested that the company earns. It can be compared directly to bond yields to assess relative attractiveness of stocks versus fixed income.