Ameren Illinois Co (AILIM) stock
AILIMOTCElectric & Other Services CombinedFiscal year ends December 31Also trades as AILIH, AILIN, AILIO, AILIP, AILLI, AILLM, AILLN, AILLO, AILLP
Last filing: 10-Q on Aug 3, 2026
$75.50−0.25 (-0.33%)
Close on Oct 19, 2026Market cap –P/E –Yield –
Price history
Ameren Illinois share prices for every month, newest first. Adjusted for stock splits, not for dividends.
Close, Oct 19, 2026
$75.50
-0.33% on the day
52-week range
$74.30 – $81.00
-6.8% from the high
Change over 52 weeks
-1.9%
From $77.00 on Oct 17, 2025
Average volume
11
Shares a day, last 90 sessions
| Month | Open | High | Low | Close | Change | Volume |
|---|---|---|---|---|---|---|
| Oct 2026 | $75.75 | $75.75 | $74.30 | $75.50 | -0.33% | 300 |
| Sep 2026 | $77.00 | $77.00 | $75.75 | $75.75 | -1.62% | 200 |
| Aug 2026 | $77.00 | $77.00 | $77.00 | $77.00 | 0.00% | 0 |
| Jul 2026 | $76.00 | $77.00 | $75.50 | $77.00 | +1.32% | 325 |
| Jun 2026 | $80.00 | $80.00 | $75.43 | $76.00 | -5.00% | 516 |
| May 2026 | $77.00 | $80.00 | $77.00 | $80.00 | +3.90% | 490 |
| Apr 2026 | $77.00 | $77.00 | $77.00 | $77.00 | -4.94% | 200 |
| Mar 2026 | $79.00 | $81.00 | $79.00 | $81.00 | +2.53% | 160 |
| Feb 2026 | $77.25 | $79.75 | $75.25 | $79.00 | +2.27% | 1,483 |
| Jan 2026 | $77.00 | $77.25 | $77.00 | $77.25 | +0.32% | 135 |
| Dec 2025 | $77.00 | $77.25 | $77.00 | $77.00 | 0.00% | 247 |
| Nov 2025 | $77.00 | $77.50 | $77.00 | $77.00 | 0.00% | 300 |
| Oct 2025 | $77.75 | $77.75 | $77.00 | $77.00 | -0.96% | 1,054 |
| Sep 2025 | $77.75 | $77.75 | $77.75 | $77.75 | 0.00% | 0 |
| Aug 2025 | $76.00 | $77.75 | $75.00 | $77.75 | +2.30% | 890 |
| Jul 2025 | $73.55 | $76.00 | $73.55 | $76.00 | +3.33% | 550 |
| Jun 2025 | $75.82 | $83.33 | $73.52 | $73.55 | -2.99% | 981 |
| May 2025 | $76.00 | $76.00 | $75.82 | $75.82 | -0.24% | 720 |
| Apr 2025 | $79.00 | $79.00 | $76.00 | $76.00 | -3.80% | 200 |
| Mar 2025 | $76.00 | $79.00 | $76.00 | $79.00 | +1.52% | 846 |
| Feb 2025 | $77.00 | $77.82 | $75.82 | $77.82 | +1.06% | 260 |
| Jan 2025 | $77.85 | $77.85 | $77.00 | $77.00 | -1.09% | 410 |
| Dec 2024 | $77.90 | $77.90 | $77.85 | $77.85 | -0.06% | 350 |
| Nov 2024 | $79.00 | $80.00 | $77.90 | $77.90 | -1.39% | 1,459 |
| Oct 2024 | $81.00 | $82.00 | $79.00 | $79.00 | -2.47% | 516 |
| Sep 2024 | $78.00 | $81.00 | $78.00 | $81.00 | +3.85% | 100 |
| Aug 2024 | $78.00 | $78.00 | $78.00 | $78.00 | 0.00% | 100 |
| Jul 2024 | $74.00 | $78.00 | $73.34 | $78.00 | +4.81% | 1,600 |
| Jun 2024 | $75.75 | $75.75 | $74.42 | $74.42 | -1.76% | 500 |
| May 2024 | $76.40 | $76.50 | $75.75 | $75.75 | -0.85% | 400 |
| Apr 2024 | $78.62 | $78.62 | $76.40 | $76.40 | -2.82% | 300 |
| Mar 2024 | $78.25 | $78.62 | $78.25 | $78.62 | +0.47% | 100 |
| Feb 2024 | $78.25 | $78.25 | $78.25 | $78.25 | 0.00% | 200 |
| Jan 2024 | $78.00 | $78.25 | $78.00 | $78.25 | +1.82% | 300 |
| Dec 2023 | $83.00 | $83.00 | $76.55 | $76.85 | -7.41% | 400 |
| Nov 2023 | $83.00 | $83.00 | $83.00 | $83.00 | 0.00% | 0 |
| Oct 2023 | $83.00 | $83.00 | $83.00 | $83.00 | 0.00% | 0 |
| Sep 2023 | $83.00 | $83.00 | $83.00 | $83.00 | 0.00% | 0 |
| Aug 2023 | $85.85 | $85.85 | $82.50 | $83.00 | -3.32% | 300 |
| Jul 2023 | $85.85 | $85.85 | $85.85 | $85.85 | 0.00% | 0 |
| Jun 2023 | $85.85 | $85.85 | $85.85 | $85.85 | 0.00% | 0 |
| May 2023 | $86.00 | $86.00 | $85.85 | $85.85 | -0.17% | 100 |
| Apr 2023 | $86.00 | $86.00 | $86.00 | $86.00 | 0.00% | 0 |
| Mar 2023 | $95.75 | $95.75 | $81.00 | $86.00 | -10.18% | 500 |
| Feb 2023 | $95.75 | $95.75 | $95.75 | $95.75 | 0.00% | 0 |
| Jan 2023 | $95.75 | $95.75 | $95.75 | $95.75 | 0.00% | 0 |
| Dec 2022 | $95.75 | $95.75 | $95.75 | $95.75 | 0.00% | 0 |
| Nov 2022 | $95.75 | $95.75 | $95.75 | $95.75 | 0.00% | 0 |
| Oct 2022 | $95.75 | $95.75 | $95.75 | $95.75 | 0.00% | 0 |
| Sep 2022 | $95.75 | $95.75 | $95.75 | $95.75 | 0.00% | 0 |
| Aug 2022 | $95.75 | $95.75 | $95.75 | $95.75 | 0.00% | 0 |
| Jul 2022 | $95.75 | $95.75 | $95.75 | $95.75 | 0.00% | 0 |
| Jun 2022 | $96.95 | $96.95 | $95.00 | $95.75 | -1.24% | 900 |
| May 2022 | $95.25 | $96.95 | $95.00 | $96.95 | +1.78% | 300 |
| Apr 2022 | $100.00 | $100.00 | $94.25 | $95.25 | -4.75% | 1,200 |
| Mar 2022 | $100.00 | $100.20 | $100.00 | $100.00 | 0.00% | 400 |
| Feb 2022 | $101.69 | $101.69 | $98.75 | $100.00 | -1.66% | 9,100 |
| Jan 2022 | $103.00 | $103.00 | $101.69 | $101.69 | -1.27% | 400 |
| Dec 2021 | $103.00 | $103.00 | $103.00 | $103.00 | 0.00% | 0 |
| Nov 2021 | $101.02 | $103.00 | $101.02 | $103.00 | +1.96% | 1,300 |
| Oct 2021 | $101.02 | $101.02 | $101.02 | $101.02 | 0.00% | 0 |
| Sep 2021 | $101.02 | $101.02 | $101.02 | $101.02 | 0.00% | 0 |
| Aug 2021 | $102.40 | $103.75 | $101.02 | $101.02 | -1.35% | 400 |
| Jul 2021 | $102.25 | $102.40 | $102.24 | $102.40 | +0.15% | 600 |
| Jun 2021 | $102.25 | $102.25 | $102.25 | $102.25 | 0.00% | 0 |
| May 2021 | $102.50 | $102.50 | $102.25 | $102.25 | -0.24% | 100 |
| Apr 2021 | $102.25 | $102.75 | $102.25 | $102.50 | +0.24% | 300 |
| Mar 2021 | $103.15 | $103.15 | $102.00 | $102.25 | -0.87% | 400 |
| Feb 2021 | $104.00 | $104.00 | $103.15 | $103.15 | -0.82% | 100 |
| Jan 2021 | $104.00 | $104.19 | $101.86 | $104.00 | 0.00% | 700 |
| Dec 2020 | $103.50 | $104.25 | $103.50 | $104.00 | +0.48% | 900 |
| Nov 2020 | $103.00 | $103.50 | $103.00 | $103.50 | +0.49% | 300 |
| Oct 2020 | $100.01 | $103.20 | $100.01 | $103.00 | +2.99% | 1,000 |
| Sep 2020 | $100.01 | $100.01 | $100.01 | $100.01 | 0.00% | 0 |
| Aug 2020 | $100.01 | $100.01 | $100.01 | $100.01 | 0.00% | 0 |
| Jul 2020 | $100.01 | $100.01 | $100.01 | $100.01 | 0.00% | 0 |
| Jun 2020 | $100.01 | $100.01 | $100.01 | $100.01 | 0.00% | 0 |
| May 2020 | $100.01 | $100.01 | $100.01 | $100.01 | 0.00% | 0 |
| Apr 2020 | $100.61 | $100.61 | $99.00 | $100.01 | -0.60% | 300 |
| Mar 2020 | $100.50 | $100.61 | $100.50 | $100.61 | +0.11% | 100 |
| Feb 2020 | $100.50 | $100.50 | $100.50 | $100.50 | 0.00% | 0 |
| Jan 2020 | $100.50 | $100.50 | $100.50 | $100.50 | 0.00% | 0 |
| Dec 2019 | $101.00 | $101.00 | $99.50 | $100.50 | -0.50% | 400 |
| Nov 2019 | $101.00 | $101.00 | $101.00 | $101.00 | 0.00% | 100 |
| Oct 2019 | $101.00 | $101.00 | $101.00 | $101.00 | 0.00% | 100 |
| Sep 2019 | $101.00 | $101.00 | $101.00 | $101.00 | 0.00% | 0 |
| Aug 2019 | $101.50 | $101.50 | $99.00 | $101.00 | -0.49% | 600 |
| Jul 2019 | $100.00 | $156.80 | $91.00 | $101.50 | +1.50% | 1,000 |
| Jun 2019 | $100.00 | $100.00 | $100.00 | $100.00 | 0.00% | 0 |
| May 2019 | $100.00 | $100.00 | $100.00 | $100.00 | 0.00% | 100 |
| Apr 2019 | $100.00 | $100.00 | $100.00 | $100.00 | 0.00% | 0 |
| Mar 2019 | $102.50 | $102.50 | $100.00 | $100.00 | -2.44% | 300 |
| Feb 2019 | $102.50 | $102.50 | $102.50 | $102.50 | 0.00% | 0 |
| Jan 2019 | $101.00 | $102.50 | $101.00 | $102.50 | +1.49% | 9,600 |
| Dec 2018 | $101.00 | $101.00 | $101.00 | $101.00 | 0.00% | 200 |
| Nov 2018 | $99.01 | $101.00 | $99.01 | $101.00 | +2.01% | 300 |
| Oct 2018 | $99.01 | $99.01 | $99.01 | $99.01 | 0.00% | 0 |
| Sep 2018 | $99.01 | $99.01 | $99.01 | $99.01 | 0.00% | 0 |
| Aug 2018 | $99.01 | $99.01 | $99.01 | $99.01 | 0.00% | 0 |
| Jul 2018 | $99.01 | $99.01 | $99.01 | $99.01 | 0.00% | 0 |
| Jun 2018 | $99.01 | $99.01 | $99.01 | $99.01 | 0.00% | 100 |
| May 2018 | $99.01 | $99.01 | $99.01 | $99.01 | 0.00% | 0 |
| Apr 2018 | $99.01 | $99.01 | $99.01 | $99.01 | 0.00% | 0 |
| Mar 2018 | $102.75 | $102.75 | $99.01 | $99.01 | -3.64% | 100 |
| Feb 2018 | $102.75 | $102.75 | $102.75 | $102.75 | 0.00% | 0 |
| Jan 2018 | $102.75 | $102.75 | $102.75 | $102.75 | 0.00% | 0 |
| Dec 2017 | $101.75 | $102.75 | $101.75 | $102.75 | +0.98% | 400 |
| Nov 2017 | $100.00 | $101.75 | $100.00 | $101.75 | +1.75% | 100 |
| Oct 2017 | $98.00 | $100.00 | $97.50 | $100.00 | +2.04% | 700 |
| Sep 2017 | $98.00 | $98.00 | $98.00 | $98.00 | 0.00% | 0 |
| Aug 2017 | $98.00 | $98.00 | $98.00 | $98.00 | 0.00% | 0 |
| Jul 2017 | $95.82 | $98.00 | $95.82 | $98.00 | +2.28% | 200 |
| Jun 2017 | $95.82 | $95.82 | $95.82 | $95.82 | 0.00% | 0 |
| May 2017 | $95.82 | $95.82 | $95.82 | $95.82 | 0.00% | 0 |
| Apr 2017 | $95.82 | $95.82 | $95.82 | $95.82 | 0.00% | 0 |
| Mar 2017 | $95.82 | $95.82 | $95.82 | $95.82 | 0.00% | 0 |
| Feb 2017 | $97.50 | $97.50 | $95.82 | $95.82 | -1.72% | 100 |
| Jan 2017 | $97.50 | $97.50 | $97.50 | $97.50 | 0.00% | 0 |
| Dec 2016 | $97.50 | $97.50 | $97.50 | $97.50 | 0.00% | 0 |
| Nov 2016 | $97.50 | $97.50 | $97.50 | $97.50 | 0.00% | 0 |
| Oct 2016 | $100.50 | $100.50 | $97.00 | $97.50 | -2.99% | 300 |
| Sep 2016 | $100.50 | $100.50 | $100.50 | $100.50 | 0.00% | 0 |
| Aug 2016 | $100.50 | $100.50 | $100.50 | $100.50 | 0.00% | 0 |
| Jul 2016 | $98.50 | $101.00 | $97.00 | $100.50 | +2.03% | 800 |
| Jun 2016 | $97.50 | $98.50 | $97.50 | $98.50 | +1.03% | 100 |
| May 2016 | $98.00 | $98.00 | $97.00 | $97.50 | -0.51% | 300 |
| Apr 2016 | $100.00 | $100.00 | $96.50 | $98.00 | -2.00% | 300 |
| Mar 2016 | $100.00 | $100.00 | $100.00 | $100.00 | 0.00% | 0 |
| Feb 2016 | $100.00 | $100.00 | $100.00 | $100.00 | 0.00% | 0 |
| Jan 2016 | $100.00 | $100.00 | $100.00 | $100.00 | 0.00% | 0 |
| Dec 2015 | $100.00 | $100.00 | $100.00 | $100.00 | 0.00% | 0 |
| Nov 2015 | $100.00 | $100.00 | $100.00 | $100.00 | 0.00% | 0 |
| Oct 2015 | $100.00 | $100.00 | $100.00 | $100.00 | 0.00% | 0 |
| Sep 2015 | $100.00 | $100.00 | $100.00 | $100.00 | 0.00% | 0 |
| Aug 2015 | $100.00 | $100.00 | $100.00 | $100.00 | 0.00% | 0 |
| Jul 2015 | $100.00 | $100.00 | $100.00 | $100.00 | 0.00% | 0 |
| Jun 2015 | $100.00 | $100.00 | $100.00 | $100.00 | 0.00% | 0 |
| May 2015 | $100.00 | $100.00 | $100.00 | $100.00 | 0.00% | 0 |
| Apr 2015 | $100.00 | $100.00 | $100.00 | $100.00 | 0.00% | 0 |
| Mar 2015 | $100.00 | $100.00 | $100.00 | $100.00 | 0.00% | 0 |
| Feb 2015 | $100.00 | $101.50 | $99.50 | $100.00 | 0.00% | 2,100 |
| Jan 2015 | $98.75 | $100.00 | $98.75 | $100.00 | +1.27% | 1,900 |
| Dec 2014 | $98.75 | $98.75 | $98.75 | $98.75 | 0.00% | 0 |
| Nov 2014 | $98.75 | $98.75 | $98.75 | $98.75 | 0.00% | 0 |
| Oct 2014 | $99.50 | $99.50 | $97.75 | $98.75 | -0.75% | 1,700 |
| Sep 2014 | $97.50 | $99.50 | $97.50 | $99.50 | +2.05% | 800 |
| Aug 2014 | $97.50 | $97.50 | $97.50 | $97.50 | 0.00% | 0 |
| Jul 2014 | $97.75 | $97.75 | $97.00 | $97.50 | -0.26% | 900 |
| Jun 2014 | $93.00 | $97.75 | $93.00 | $97.75 | +5.11% | 800 |
| May 2014 | $92.00 | $93.00 | $92.00 | $93.00 | -4.12% | 600 |
| Apr 2014 | $98.50 | $98.50 | $95.50 | $97.00 | -1.52% | 900 |
| Mar 2014 | $98.50 | $98.50 | $98.50 | $98.50 | 0.00% | 0 |
| Feb 2014 | $95.00 | $98.50 | $95.00 | $98.50 | +3.68% | 800 |
| Jan 2014 | $97.05 | $97.05 | $95.00 | $95.00 | -2.11% | 1,600 |
| Dec 2013 | $97.05 | $97.05 | $97.05 | $97.05 | 0.00% | 0 |
| Nov 2013 | $97.05 | $97.05 | $97.05 | $97.05 | 0.00% | 0 |
| Oct 2013 | $97.05 | $97.05 | $97.05 | $97.05 | 0.00% | 0 |
| Sep 2013 | $97.05 | $97.05 | $97.05 | $97.05 | 0.00% | 0 |
| Aug 2013 | $95.00 | $97.05 | $95.00 | $97.05 | +2.16% | 100 |
| Jul 2013 | $102.50 | $102.50 | $95.00 | $95.00 | -7.32% | 700 |
| Jun 2013 | $102.50 | $102.50 | $102.50 | $102.50 | 0.00% | 0 |
| May 2013 | $102.50 | $102.50 | $102.50 | $102.50 | 0.00% | 0 |
| Apr 2013 | $101.00 | $102.50 | $100.00 | $102.50 | +1.49% | 13,800 |
| Mar 2013 | $101.00 | $101.00 | $101.00 | $101.00 | 0.00% | 0 |
| Feb 2013 | $100.50 | $101.00 | $97.50 | $101.00 | +0.50% | 5,400 |
| Jan 2013 | $96.82 | $100.50 | $96.82 | $100.50 | +3.80% | 5,000 |
| Dec 2012 | $96.82 | $96.82 | $96.82 | $96.82 | 0.00% | 0 |
| Nov 2012 | $98.00 | $100.00 | $96.82 | $96.82 | -1.20% | 5,300 |
| Oct 2012 | $100.50 | $100.50 | $96.00 | $98.00 | -2.49% | 6,100 |
| Sep 2012 | $100.50 | $100.50 | $100.50 | $100.50 | – | 0 |
Seasonality
AILIM return in each calendar month over the last 10 years, including dividends. The current month runs to the latest close.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average | 1.4% | -0.1% | -1.3% | -0.4% | 0.4% | -1.1% | 2.7% | -0.3% | 0.2% | 1.5% | 0.5% | -0.7% |
| Months up | 9 of 10 | 2 of 10 | 4 of 10 | 6 of 10 | 2 of 10 | 0 of 10 | 10 of 10 | 1 of 10 | 1 of 10 | 9 of 10 | 4 of 9 | 2 of 9 |
| 2026 | 1.9% | 2.3% | 2.5% | -3.5% | 3.9% | -5.0% | 2.9% | 0.0% | -1.6% | 1.2% | ||
| 2025 | 0.4% | 1.1% | 1.5% | -2.3% | -0.2% | -3.0% | 5.0% | 2.3% | 0.0% | 0.6% | 0.0% | 0.0% |
| 2024 | 3.4% | 0.0% | 0.5% | -1.3% | -0.9% | -1.8% | 6.5% | 0.0% | 3.8% | -1.0% | -1.4% | -0.1% |
| 2023 | 1.2% | 0.0% | -10.2% | 1.4% | -0.2% | 0.0% | 1.4% | -3.3% | 0.0% | 1.4% | 0.0% | -7.4% |
| 2022 | -0.1% | -1.7% | 0.0% | -3.6% | 1.8% | -1.2% | 1.2% | 0.0% | 0.0% | 1.2% | 0.0% | 0.0% |
| 2021 | 1.1% | -0.8% | -0.9% | 1.4% | -0.2% | 0.0% | 1.3% | -1.3% | 0.0% | 1.2% | 2.0% | 0.0% |
| 2020 | 1.2% | 0.0% | 0.1% | 0.6% | 0.0% | 0.0% | 1.2% | 0.0% | 0.0% | 4.2% | 0.5% | 0.5% |
| 2019 | 2.7% | 0.0% | -2.4% | 1.2% | 0.0% | 0.0% | 2.3% | -0.5% | 0.0% | 1.2% | 0.0% | -0.5% |
| 2018 | 1.2% | 0.0% | -3.6% | 1.2% | 0.0% | 0.0% | 1.2% | 0.0% | 0.0% | 1.2% | 2.0% | 0.0% |
| 2017 | 1.2% | -1.7% | 0.0% | 1.2% | 0.0% | 0.0% | 3.5% | 0.0% | 0.0% | 3.3% | 1.7% | 1.0% |