Start with its own history
At 13.95×, AILLI is 20.2% below its 10-observation annual average. A lower multiple can reflect a lower price, higher earnings, or weaker growth expectations—not necessarily a bargain.
OTC · AILLIRegulated ElectricUpdated Oct 24, 2026
Ameren Illinois Company P/E ratio
Current valuation, historical context, and peer comparisons.
Current P/E ratio
13.95×
20.2% belowthe 10-year annual average
Share price79.5
÷Earnings per share5.7
Price and EPS in quote currency. Calculation details
Investors are paying 13.95 for every 1 of reported earnings per share.
P/E over time
2016 – 2025
Annual P/ESelected-period average 17.48×
3-year average19.13×3 positive annual observations
5-year average13.72×5 positive annual observations
10-year average17.48×10 positive annual observations
Peer median · TTM19.75×8 peers with positive P/E
Historical P/E ratios
Annual period-end data · 16 observations
| Period end | P/E | Change |
|---|---|---|
| Dec 31, 2025 | 17.10× | -53.5% |
| Dec 31, 2024 | 36.75× | +937.3% |
| Dec 31, 2023 | 3.54× | -28.7% |
| Dec 31, 2022 | 4.97× | -20.3% |
| Dec 31, 2021 | 6.24× | -15.7% |
| Dec 31, 2020 | 7.40× | -89.5% |
| Dec 31, 2019 | 70.23× | +728.3% |
| Dec 31, 2018 | 8.48× | -12.6% |
View all 16 annual observations +
| Period end | P/E | Change |
|---|---|---|
| Dec 31, 2017 | 9.71× | -6.9% |
| Dec 31, 2016 | 10.43× | -12.5% |
| Dec 31, 2015 | 11.92× | -2.4% |
| Dec 31, 2014 | 12.21× | -20.4% |
| Dec 31, 2013 | 15.33× | -16.5% |
| Dec 31, 2012 | 18.35× | +42.4% |
| Dec 31, 2011 | 12.89× | +46.7% |
| Dec 31, 2010 | 8.79× | N/M |
Change is relative to the preceding observation. N/M values are excluded from averages.
How AILLI compares
Company P/E vs. peer trailing-12-month ratios
| Company | P/E ratio |
|---|---|
 AILLI This stockAmeren Illinois Company | 13.95× |
 AEEAmeren Corporation | 18.86× |
 UEPCOUnion Electric Company | 15.03× |
 DUKDuke Energy Corporation | 18.77× |
 CNPCenterPoint Energy, Inc. | 24.16× |
 CMSCMS Energy Corporation | 20.59× |
 WECWEC Energy Group, Inc. | 21.36× |
 EDConsolidated Edison, Inc. | 18.91× |
 FEFirstEnergy Corp. | 24.61× |
Peers are selected by the data provider. Business models and earnings definitions can differ.
Put the numbers in context
What does AILLI’s P/E tell you?
Compare like with like
The median of the 8 positive peer ratios above is 19.75×. 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 AILLI 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("AILLI", "PE Ratio", "LQ")Sources & calculation methodology
Current P/E
Share price 79.5 ÷ EPS 5.7 = 13.95×. Data is supplied by Financial Modeling Prep through Wisesheets. Quote feed updated Oct 24, 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.
AILLI P/E ratio: common questions
The essentials behind the numbers.
Ameren Illinois Company's current P/E is 13.95× based on the quote data last updated Oct 24, 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.