Aldeyra Therapeutics, Inc. (ALDX) P/E Ratio History
Deep ValueTrading at -3.5x · 0th percentile of 5-year range · Significant discount to historical valuation · Data 2014–2014
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P/E Ratio Analysis
As of June 22, 2026, Aldeyra Therapeutics, Inc. (ALDX) trades at a price-to-earnings ratio of -3.5x, with a stock price of $1.96 and trailing twelve-month earnings per share of $-0.45.
The current P/E is 310% below its 5-year average of 1.7x. Over the past five years, ALDX's P/E has ranged from a low of 1.7x to a high of 1.7x, placing the current valuation at the 0th percentile of its historical range.
Compared to the Healthcare sector median P/E of 22.1x, ALDX trades at a 116% discount to its sector peers. The sector includes 234 companies with P/E ratios ranging from 0.0x to 197.0x.
Relative to the broader market, ALDX trades at a notable discount to the S&P 500 median P/E of 24.4x. 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 ALDX 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.
ALDX Cross-Benchmark Valuation
How does the current P/E compare to sector peers and the broader market?
ALDX P/E vs Peers
Ophthalmology Therapies and Delivery peers sorted by market cap
| Company | Market Cap | P/E Ratio | PEG Ratio | EPS Growth (1Y) |
|---|---|---|---|---|
| $8B | 26.8 | 1.17 | -25% | |
| $2B | 6.8 | 0.66Best | +817%Best | |
| $91M | 3.9Lowest | - | +123% |
Lower P/E can signal a discount or weaker growth expectations; PEG adds growth context.
ALDX Historical P/E Data (2014–2014)
Quarterly P/E ratios calculated from closing price and TTM EPS
| Quarter | Period End | Price | TTM EPS | P/E Ratio | vs Avg |
|---|---|---|---|---|---|
| FY2014 Q2 | Jun 30 2014 | $6.56 | $3.94 | 1.7x | +0% |
Average P/E for displayed period: 1.7x
Intrinsic Valuation
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Historical Returns
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Peer Comparison
Compare growth, multiples, and margins vs sector.
ALDX — Frequently Asked Questions
Quick answers to the most common questions about buying ALDX stock.
What is ALDX's P/E ratio?
Aldeyra Therapeutics, Inc. (ALDX) trailing twelve-month P/E ratio is -3.5x, based on TTM diluted EPS of $-0.45. The 5-year average P/E is 1.7x and the historical range spans 1.7x to 1.7x.
Is ALDX stock overvalued or undervalued?
ALDX trades at -3.5x P/E, below its 5-year average of 1.7x. At the 0th percentile of its historical range (1.7x–1.7x), the stock is priced at a discount to its own history.
Is ALDX stock expensive?
No, ALDX is not expensive on a historical basis. The current P/E of -3.5x is below the 5-year average of 1.7x and sits at the 0th percentile of its valuation range.
What is ALDX's historical P/E range?
Over the past 5 years, ALDX's P/E ratio has ranged from 1.7x to 1.7x, with a median of 1.7x and an average of 1.7x. The current P/E of -3.5x places the stock at the 0th percentile of this range. Full historical data spans 2014–2014.
How does ALDX's P/E compare to the S&P 500?
ALDX trades at -3.5x P/E versus the S&P 500 median of 24.4x. The 114% discount to the market suggests lower growth expectations or perceived higher risk.
How does ALDX's valuation compare to Healthcare peers?
Aldeyra Therapeutics, Inc. P/E of -3.5x compares to the Healthcare sector median of 22.1x. 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 ALDX's PEG ratio?
ALDX PEG ratio is N/A, based on a P/E of -3.5x and EPS growth of 40.4%. PEG normalises P/E by growth and helps compare stocks with different earnings trajectories.
What is ALDX's earnings yield?
ALDX earnings yield is N/A, the inverse of its -3.5x 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.