Innospec Inc. (IOSP) P/E Ratio History
UndervaluedTrading at 20.6x vs 5Y avg 31.2x · 45th percentile · Below historical baseline · Data 1998–2026
Loading P/E history...
P/E Ratio Analysis
As of September 23, 2026, Innospec Inc. (IOSP) trades at a price-to-earnings ratio of 20.6x, with a stock price of $96.08 and trailing twelve-month earnings per share of $4.92.
The current P/E is 34% below its 5-year average of 31.2x. Over the past five years, IOSP's P/E has ranged from a low of 15.9x to a high of 110.6x, placing the current valuation at the 45th percentile of its historical range.
Compared to the Basic Materials sector median P/E of 22.7x, IOSP is roughly in line with its sector peers. The sector includes 123 companies with P/E ratios ranging from 0.4x to 159.7x.
The PEG ratio of 0.64 (P/E divided by 229% EPS growth) suggests the stock may be undervalued relative to its earnings growth. Peter Lynch popularized the rule that a PEG below 1.0 indicates an attractive entry point.
Relative to the broader market, IOSP trades roughly in line with the S&P 500 median P/E of 25.5x. 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 IOSP 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.
IOSP Cross-Benchmark Valuation
How does the current P/E compare to sector peers and the broader market?
IOSP P/E vs Peers
Specialty additives and formulation chemicals peers sorted by market cap
| Company | Market Cap | P/E Ratio | PEG Ratio | EPS Growth (1Y) |
|---|---|---|---|---|
| $3B | 31.9 | 2.10Best | -3% | |
| $5B | 35.5 | 2.77 | +21%Best | |
| $553M | 15.8 | - | +13% | |
| $4B | 13.2 | - | -10% | |
| $451M | 9.3Lowest | 4.94 | +11% | |
| $78B | 37.9 | - | -1% |
Lower P/E can signal a discount or weaker growth expectations; PEG adds growth context.
IOSP Historical P/E Data (1998–2026)
Quarterly P/E ratios calculated from closing price and TTM EPS
| Quarter | Period End | Price | TTM EPS | P/E Ratio | vs Avg |
|---|---|---|---|---|---|
| FY2026 Q2 | - | $81.39 | $4.90 | 16.6x | -23% |
| FY2026 Q1 | - | $73.02 | $4.59 | 15.9x | -26% |
| FY2025 Q4 | Dec 31 2025 | $76.54 | $4.68 | 16.4x | -24% |
| FY2025 Q2 | Jun 30 2025 | $84.09 | $0.76 | 110.6x | +413% |
| FY2025 Q1 | Mar 31 2025 | $94.75 | $1.06 | 89.4x | +315% |
| FY2024 Q4 | - | $110.06 | $1.40 | 78.6x | +265% |
| FY2024 Q3 | Sep 30 2024 | $113.09 | $5.73 | 19.7x | -8% |
| FY2024 Q2 | Jun 30 2024 | $123.59 | $5.97 | 20.7x | -4% |
| FY2024 Q1 | Mar 31 2024 | $128.94 | $5.89 | 21.9x | +2% |
| FY2023 Q4 | Dec 31 2023 | $123.24 | $5.57 | 22.1x | +3% |
| FY2023 Q3 | Sep 30 2023 | $102.20 | $5.08 | 20.1x | -7% |
| FY2023 Q2 | Jun 30 2023 | $100.44 | $5.06 | 19.8x | -8% |
| FY2023 Q1 | Mar 31 2023 | $102.67 | $5.19 | 19.8x | -8% |
| FY2022 Q4 | Dec 31 2022 | $102.86 | $5.32 | 19.3x | -10% |
| FY2022 Q3 | Sep 30 2022 | $85.67 | $5.26 | 16.3x | -24% |
| FY2022 Q2 | - | $95.79 | $4.65 | 20.6x | -4% |
| FY2022 Q1 | - | $92.55 | $4.26 | 21.7x | +1% |
| FY2021 Q4 | Dec 31 2021 | $90.34 | $3.74 | 24.2x | +12% |
| FY2021 Q3 | - | $84.22 | $3.69 | 22.8x | +6% |
| FY2021 Q2 | Jun 30 2021 | $90.61 | $3.26 | 27.8x | +29% |
| FY2021 Q1 | Mar 31 2021 | $102.69 | $0.74 | 138.8x | +544% |
| FY2020 Q4 | - | $90.73 | $1.14 | 79.6x | +269% |
| FY2020 Q3 | Sep 30 2020 | $63.32 | $1.49 | 42.5x | +97% |
| FY2020 Q2 | - | $77.25 | $2.20 | 35.1x | +63% |
| FY2020 Q1 | - | $69.49 | $4.72 | 14.7x | -32% |
| FY2019 Q4 | - | $103.44 | $4.55 | 22.7x | +5% |
| FY2019 Q3 | Sep 30 2019 | $89.14 | $4.12 | 21.6x | +0% |
| FY2019 Q2 | Jun 30 2019 | $91.24 | $3.74 | 24.4x | +13% |
| FY2019 Q1 | Mar 31 2019 | $83.35 | $3.73 | 22.3x | +4% |
| FY2018 Q4 | Dec 31 2018 | $61.76 | $3.46 | 17.8x | -17% |
| FY2018 Q3 | Sep 30 2018 | $76.75 | $2.43 | 31.6x | +47% |
| FY2018 Q2 | Jun 30 2018 | $76.55 | $2.54 | 30.1x | +40% |
| FY2018 Q1 | Mar 31 2018 | $68.60 | $2.71 | 25.3x | +17% |
| FY2017 Q4 | Dec 31 2017 | $70.60 | $2.51 | 28.1x | +30% |
| FY2017 Q3 | Sep 30 2017 | $61.65 | $3.61 | 17.1x | -21% |
| FY2017 Q2 | Jun 30 2017 | $65.55 | $3.13 | 20.9x | -3% |
| FY2017 Q1 | Mar 31 2017 | $64.75 | $3.25 | 19.9x | -8% |
| FY2016 Q4 | Dec 31 2016 | $68.50 | $3.32 | 20.6x | -4% |
| FY2016 Q3 | Sep 30 2016 | $60.81 | $3.70 | 16.4x | -24% |
| FY2016 Q2 | - | $45.99 | $4.68 | 9.8x | -54% |
| FY2016 Q1 | - | $43.36 | $4.90 | 8.8x | -59% |
| FY2015 Q4 | - | $54.31 | $4.85 | 11.2x | -48% |
| FY2015 Q3 | Sep 30 2015 | $46.51 | $4.68 | 9.9x | -54% |
| FY2015 Q2 | - | $45.04 | $4.06 | 11.1x | -49% |
| FY2015 Q1 | - | $46.39 | $3.41 | 13.6x | -37% |
| FY2014 Q4 | Dec 31 2014 | $42.70 | $3.38 | 12.6x | -41% |
| FY2014 Q3 | - | $35.90 | $3.45 | 10.4x | -52% |
| FY2014 Q2 | Jun 30 2014 | $43.17 | $3.20 | 13.5x | -37% |
| FY2014 Q1 | Mar 31 2014 | $45.23 | $3.16 | 14.3x | -34% |
| FY2013 Q4 | - | $46.22 | $3.22 | 14.4x | -33% |
| FY2013 Q3 | Sep 30 2013 | $46.66 | $2.51 | 18.6x | -14% |
| FY2013 Q2 | Jun 30 2013 | $40.18 | $2.58 | 15.6x | -28% |
| FY2013 Q1 | Mar 31 2013 | $44.28 | $2.52 | 17.6x | -18% |
| FY2012 Q4 | Dec 31 2012 | $34.49 | $2.80 | 12.3x | -43% |
| FY2012 Q3 | Sep 30 2012 | $33.92 | $3.15 | 10.8x | -50% |
| FY2012 Q2 | Jun 30 2012 | $29.61 | $1.79 | 16.5x | -23% |
| FY2012 Q1 | Mar 31 2012 | $30.38 | $2.14 | 14.2x | -34% |
| FY2011 Q4 | Dec 31 2011 | $28.07 | $1.99 | 14.1x | -35% |
| FY2011 Q3 | Sep 30 2011 | $24.21 | $2.15 | 11.3x | -48% |
| FY2011 Q2 | - | $33.61 | $4.06 | 8.3x | -62% |
| FY2011 Q1 | - | $31.94 | $3.54 | 9.0x | -58% |
| FY2010 Q4 | Dec 31 2010 | $20.40 | $2.96 | 6.9x | -68% |
| FY2010 Q3 | - | $15.23 | $1.97 | 7.7x | -64% |
| FY2010 Q2 | Jun 30 2010 | $9.38 | $0.66 | 14.3x | -34% |
| FY2010 Q1 | Mar 31 2010 | $11.36 | $0.30 | 38.2x | +77% |
| FY2009 Q4 | - | $10.09 | $0.26 | 39.2x | +82% |
| FY2009 Q3 | Sep 30 2009 | $14.75 | $0.48 | 30.7x | +43% |
| FY2009 Q2 | - | $10.75 | $0.56 | 19.0x | -12% |
| FY2009 Q1 | - | $3.77 | $0.47 | 7.9x | -63% |
| FY2008 Q4 | Dec 31 2008 | $5.89 | $0.51 | 11.4x | -47% |
| FY2008 Q3 | - | $12.06 | $0.77 | 15.6x | -28% |
| FY2008 Q2 | Jun 30 2008 | $18.82 | $1.03 | 18.3x | -15% |
| FY2008 Q1 | Mar 31 2008 | $21.20 | $1.27 | 16.7x | -23% |
| FY2007 Q4 | Dec 31 2007 | $17.16 | $1.21 | 14.2x | -34% |
| FY2007 Q3 | Sep 30 2007 | $22.78 | $0.71 | 32.1x | +49% |
| FY2007 Q2 | Jun 30 2007 | $29.61 | $0.90 | 32.9x | +53% |
| FY2007 Q1 | Mar 31 2007 | $28.82 | $0.67 | 43.0x | +99% |
| FY2006 Q4 | Dec 31 2006 | $23.28 | $0.46 | 51.1x | +137% |
| FY2006 Q3 | Sep 30 2006 | $14.85 | $0.18 | 80.3x | +272% |
| FY2004 Q4 | Dec 31 2004 | $10.41 | $0.22 | 47.3x | +119% |
| FY2004 Q3 | - | $10.62 | $1.29 | 8.2x | -62% |
| FY2004 Q2 | Jun 30 2004 | $13.17 | $1.68 | 7.8x | -64% |
| FY2004 Q1 | Mar 31 2004 | $14.93 | $1.94 | 7.7x | -64% |
| FY2003 Q4 | Dec 31 2003 | $9.85 | $2.10 | 4.7x | -78% |
| FY2003 Q3 | - | $8.70 | $1.47 | 5.9x | -73% |
| FY2003 Q2 | Jun 30 2003 | $6.95 | $1.46 | 4.8x | -78% |
| FY2003 Q1 | Mar 31 2003 | $7.25 | $1.76 | 4.1x | -81% |
| FY2002 Q4 | - | $7.90 | $2.06 | 3.8x | -82% |
| FY2002 Q3 | Sep 30 2002 | $9.45 | $1.84 | 5.1x | -76% |
| FY2002 Q2 | Jun 30 2002 | $12.68 | $1.25 | 10.1x | -53% |
| FY2002 Q1 | Mar 31 2002 | $9.43 | $0.89 | 10.6x | -51% |
| FY2001 Q4 | Dec 31 2001 | $9.00 | $0.21 | 42.9x | +99% |
| FY2001 Q3 | Sep 30 2001 | $9.13 | $0.82 | 11.1x | -48% |
| FY2001 Q2 | Jun 30 2001 | $8.13 | $0.84 | 9.7x | -55% |
| FY2001 Q1 | Mar 31 2001 | $5.80 | $0.67 | 8.7x | -60% |
| FY2000 Q4 | Dec 31 2000 | $5.75 | $0.73 | 7.9x | -63% |
| FY2000 Q3 | Sep 30 2000 | $4.69 | $0.75 | 6.3x | -71% |
| FY2000 Q2 | Jun 30 2000 | $3.91 | $1.02 | 3.8x | -82% |
| FY2000 Q1 | Mar 31 2000 | $4.88 | $1.27 | 3.8x | -82% |
| FY1999 Q4 | Dec 31 1999 | $5.19 | $1.52 | 3.4x | -84% |
| FY1999 Q3 | - | $5.63 | $1.84 | 3.1x | -86% |
| FY1999 Q2 | Jun 30 1999 | $6.25 | $1.78 | 3.5x | -84% |
| FY1999 Q1 | Mar 31 1999 | $6.13 | $1.93 | 3.2x | -85% |
| FY1998 Q4 | - | $6.94 | $2.43 | 2.9x | -87% |
Average P/E for displayed period: 21.6x
IOSP Chart Terminal
Live VCP patterns, Cup & Handle overlays, support/resistance, and AI trade plans.
Live Breakouts Feed
High-probability breakout stocks crossing their pivot across 5 pattern engines.
Intrinsic Valuation
DCF models, multiple analysis, and analyst estimates.
Historical Returns
28+ years return with dividends reinvested.
Peer Comparison
Compare growth, multiples, and margins vs sector.
IOSP — Frequently Asked Questions
Quick answers to the most common questions about buying IOSP stock.
What is IOSP's P/E ratio?
Innospec Inc. (IOSP) trailing twelve-month P/E ratio is 20.6x, based on TTM diluted EPS of $4.92. The 5-year average P/E is 31.2x and the historical range spans 15.9x to 110.6x.
Is IOSP stock overvalued or undervalued?
IOSP trades at 20.6x P/E, below its 5-year average of 31.2x. At the 45th percentile of its historical range (15.9x–110.6x), the stock is priced at a discount to its own history.
Is IOSP stock expensive?
No, IOSP is not expensive on a historical basis. The current P/E of 20.6x is below the 5-year average of 31.2x and sits at the 45th percentile of its valuation range.
What is IOSP's historical P/E range?
Over the past 5 years, IOSP's P/E ratio has ranged from 15.9x to 110.6x, with a median of 20.7x and an average of 31.2x. The current P/E of 20.6x places the stock at the 45th percentile of this range. Full historical data spans 1998–2026.
How does IOSP's P/E compare to the S&P 500?
IOSP trades at 20.6x P/E versus the S&P 500 median of 25.5x. The 19% discount to the market suggests lower growth expectations or perceived higher risk.
How does IOSP's valuation compare to Basic Materials peers?
Innospec Inc. P/E of 20.6x compares to the Basic Materials sector median of 22.7x. 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 IOSP's PEG ratio?
IOSP PEG ratio is 0.64, based on a P/E of 20.6x and EPS growth of 228.9%. A PEG below 1.0 indicates the valuation is supported by the earnings growth rate — typically considered attractive.
What is IOSP's earnings yield?
IOSP earnings yield is 4.86%, the inverse of its 20.6x 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.