Tecogen Inc. (TGEN) P/E Ratio History
Historical price-to-earnings valuation from 2017 to 2022
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TGEN Valuation Context
How does the current P/E compare to historical and market benchmarks?
P/E Ratio Analysis
As of May 8, 2026, Tecogen Inc. (TGEN) trades at a price-to-earnings ratio of -16.1x, with a stock price of $4.82 and trailing twelve-month earnings per share of $-0.28.
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 25.5x, TGEN trades at a 163% discount to its sector peers. The sector includes 413 companies with P/E ratios ranging from 0.0x to 185.3x.
Relative to the broader market, TGEN trades at a notable discount to the S&P 500 median P/E of 25.1x. 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 P/E vs Peers
P/E ratio compared to closely matched public peers
| Company | Market Cap | P/E Ratio | PEG Ratio | EPS Growth (1Y) |
|---|---|---|---|---|
| $16B | 99.2 | - | -50% | |
| $10B | 11.3Lowest | 0.14Best | -47% | |
| $23B | 24.1 | - | +20%Best |
Peers sorted by market capitalization. P/E below peers may indicate undervaluation or lower growth expectations. Consider PEG ratio for growth-adjusted comparison.
TGEN Historical P/E Data (2017–2022)
Quarterly P/E ratios calculated from closing price and TTM EPS
| Quarter | Date | 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 | Fri Dec 31 2021 00:00:00 GM | $1.20 | $0.15 | 7.9x | -99% |
| FY2017 Q4 | Sun Dec 31 2017 00:00:00 GM | $2.70 | $0.00 | 4500.0x | +295% |
Average P/E for displayed period: 1140.5x
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Start ComparisonTGEN — Frequently Asked Questions
Quick answers to the most common questions about buying TGEN stock.
Is TGEN stock overvalued or undervalued?
TGEN trades at -16.1x P/E, below its 5-year average of 1140.5x. At the N/A percentile of historical range, the stock is priced at a discount to its own history.
How does TGEN's valuation compare to peers?
Tecogen Inc. P/E of -16.1x compares to sector median of 25.5x. The discount suggests lower growth expectations or higher risk.
What is TGEN's PEG ratio?
TGEN PEG ratio is N/A. Above 2.0 indicates premium valuation relative to growth rate. Historical P/E data spans 2017-2022.