Start with its own history
At 16.33×, IOSP is 49.6% below its 10-observation annual average. A lower multiple can reflect a lower price, higher earnings, or weaker growth expectations—not necessarily a bargain.
NASDAQ · IOSPChemicals - SpecialtyUpdated Nov 4, 2026
Innospec Inc. P/E ratio
Current valuation, historical context, and peer comparisons.
Current P/E ratio
16.33×
49.6% belowthe 10-year annual average
Share price80.65
÷Earnings per share4.94
Price and EPS in quote currency. Calculation details
Investors are paying 16.33 for every 1 of reported earnings per share.
P/E over time
2016 – 2025
Annual P/ESelected-period average 32.40×
3-year average38.43×3 positive annual observations
5-year average31.67×5 positive annual observations
10-year average32.40×10 positive annual observations
Peer median · TTM18.41×7 peers with positive P/E
Historical P/E ratios
Annual period-end data · 25 observations
| Period end | P/E | Change |
|---|---|---|
| Dec 31, 2025 | 16.32× | -78.8% |
| Dec 31, 2024 | 76.97× | +249.7% |
| Dec 31, 2023 | 22.01× | +14.9% |
| Dec 31, 2022 | 19.15× | -19.9% |
| Dec 31, 2021 | 23.90× | -69.2% |
| Dec 31, 2020 | 77.55× | +243.4% |
| Dec 31, 2019 | 22.59× | +27.3% |
| Dec 31, 2018 | 17.75× | -35.6% |
View all 25 annual observations +
| Period end | P/E | Change |
|---|---|---|
| Dec 31, 2017 | 27.58× | +36.5% |
| Dec 31, 2016 | 20.21× | +84.5% |
| Dec 31, 2015 | 10.95× | -11.5% |
| Dec 31, 2014 | 12.38× | -11.9% |
| Dec 31, 2013 | 14.05× | +17.7% |
| Dec 31, 2012 | 11.93× | -12.0% |
| Dec 31, 2011 | 13.56× | +106.1% |
| Dec 31, 2010 | 6.58× | -82.4% |
| Dec 31, 2009 | 37.37× | +236.3% |
| Dec 31, 2008 | 11.11× | -20.3% |
| Dec 31, 2007 | 13.95× | -71.8% |
| Dec 31, 2006 | 49.53× | N/M |
| Dec 31, 2005 | N/M | N/M |
| Dec 31, 2004 | 41.64× | +817.3% |
| Dec 31, 2003 | 4.54× | +27.0% |
| Dec 31, 2002 | 3.57× | -90.5% |
| Dec 31, 2001 | 37.50× | N/M |
Change is relative to the preceding observation. N/M values are excluded from averages.
How IOSP compares
Company P/E vs. peer trailing-12-month ratios
| Company | P/E ratio |
|---|---|
 IOSP This stockInnospec Inc. | 16.33× |
 KWRQuaker Houghton | 27.99× |
 NEUNewMarket Corporation | 14.73× |
 FULH.B. Fuller Company | 14.44× |
 CBTCabot Corp. | 18.41× |
 CLMTCalumet Inc. | N/M |
 ASHAshland Inc. | 849.33× |
 EMNEastman Chemical Company | 11.92× |
 HWKNHawkins, Inc. | 37.67× |
Peers are selected by the data provider. Business models and earnings definitions can differ.
Put the numbers in context
What does IOSP’s P/E tell you?
Compare like with like
The median of the 7 positive peer ratios above is 18.41×. Check growth, margins, debt, and earnings quality before interpreting the gap. A faster-growing business may justify a higher multiple.
Check what drives earnings
One-off gains can temporarily lower P/E; unusual charges can raise it. Reported earnings and forward estimates answer different questions. Pair this view with return on equity and liquidity for a fuller picture.
Keep your research connected
Take IOSP into your spreadsheet
Pull historical P/E into Excel or Google Sheets with Wisesheets. Build your own comparisons alongside the rest of your financial model.
Explore WisesheetsQuarterly P/E · latest quarterLQ selects the latest reported quarter. Requires the Wisesheets add-in. See available data
=WISE("IOSP", "PE Ratio", "LQ")Sources & calculation methodology
Current P/E
Share price 80.65 ÷ EPS 4.94 = 16.33×. Data is supplied by Financial Modeling Prep through Wisesheets. Quote feed updated Nov 4, 2026; this is not a real-time trading quote.
History & averages
Annual and quarterly P/E observations are provided separately from the current quote. Averages use the latest 3, 5, or 10 annual observations, excluding missing and nonpositive ratios. Pre-IPO observations are omitted. These are period-end observations, not daily averages.
Data definitions and limitations
The current quote feed does not specify the exact EPS filing-period end or whether EPS is basic or diluted. We do not label it as forward P/E. Peer ratios are explicitly trailing-12-month (TTM) values. Historical observations do not include independently verified price and EPS inputs. Sources may update on different schedules; rounded inputs can produce small calculation differences. Historical comparisons describe past pricing, not an estimate of fair value.
IOSP P/E ratio: common questions
The essentials behind the numbers.
Innospec Inc.'s current P/E is 16.33× based on the quote data last updated Nov 4, 2026. It represents the share price divided by reported earnings per share. Prices and earnings may refresh on different schedules.
Annual P/E uses earnings for a completed fiscal year. Trailing-12-month (TTM) P/E uses the latest four quarters, while forward P/E uses forecast earnings. These are not interchangeable. This page labels peer ratios as TTM and shows dated annual or quarterly historical observations; it does not show forward estimates.
N/M means not meaningful: the feed has no positive P/E for that observation. Negative or zero earnings should not be ranked as a low positive valuation multiple. N/M observations are excluded from the averages shown above.
Divide the share price by earnings per share (EPS). For example, a share price of 100 and EPS of 5 gives a P/E of 20×. This page uses the price and EPS supplied together in the quote when both are positive.
Price timestamps, EPS definitions, share classes, adjustments, and fiscal periods can differ. A forward P/E also uses forecast earnings rather than reported earnings. Compare the inputs and as-of dates before comparing two displayed ratios.
Not necessarily. The average describes previous market pricing, not fair value. Changes in earnings quality, growth expectations, debt, accounting, and business risk can justify a different multiple today.