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Ameren Illinois Co (AILLO) stock

AILLOOTCElectric & Other Services CombinedFiscal year ends December 31Also trades as AILIH, AILIM, AILIN, AILIO, AILIP, AILLI, AILLM, AILLN, AILLP
Last filing: 10-Q on Aug 3, 2026
$65.25+0.00 (0.00%)

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.

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Close, Oct 19, 2026
$65.25
0.00% on the day
52-week range
$65.25 – $72.00
-9.4% from the high
Change over 52 weeks
-6.3%
From $69.65 on Oct 17, 2025
Average volume
26
Shares a day, last 90 sessions
MonthOpenHighLowCloseChangeVolume
Oct 2026$66.55$67.50$65.25$65.25-1.95%605
Sep 2026$67.35$67.35$66.55$66.55-1.41%1,291
Aug 2026$68.25$68.25$67.50$67.50-1.10%107
Jul 2026$68.40$68.40$68.00$68.25-0.22%361
Jun 2026$68.40$68.40$68.40$68.400.00%0
May 2026$69.00$69.50$68.39$68.40-0.87%937
Apr 2026$69.50$69.50$68.44$69.00-0.72%760
Mar 2026$70.11$71.00$69.50$69.50-0.87%2,322
Feb 2026$68.61$70.50$68.61$70.11+2.19%1,149
Jan 2026$69.50$70.04$68.61$68.61-1.28%1,043
Dec 2025$70.00$71.50$69.50$69.50-0.71%1,250
Nov 2025$70.99$72.00$69.49$70.00-1.39%1,650
Oct 2025$69.75$70.99$69.04$70.99+1.78%570
Sep 2025$67.75$70.88$67.75$69.75+2.95%893
Aug 2025$68.00$68.00$67.70$67.75-0.37%1,615
Jul 2025$67.90$69.00$66.91$68.00+0.15%2,369
Jun 2025$66.81$67.90$66.00$67.90+1.63%810
May 2025$68.35$68.35$66.77$66.81-2.25%505
Apr 2025$70.00$70.00$68.35$68.35-2.36%102
Mar 2025$70.00$72.00$70.00$70.000.00%402
Feb 2025$70.00$70.00$70.00$70.00+0.39%200
Jan 2025$69.00$70.00$69.00$69.73+1.06%633
Dec 2024$70.00$70.28$69.00$69.00+0.58%2,216
Nov 2024$71.46$71.50$68.60$68.60-4.00%2,992
Oct 2024$74.00$74.00$71.40$71.46-3.11%6,290
Sep 2024$70.00$74.20$70.00$73.75+6.42%3,900
Aug 2024$70.95$80.00$68.40$69.30-2.33%1,100
Jul 2024$67.15$70.95$67.15$70.95+5.69%7,300
Jun 2024$68.00$68.00$67.02$67.13-1.28%1,200
May 2024$67.55$69.00$67.13$68.00+1.07%1,400
Apr 2024$69.12$71.20$67.28$67.28-2.66%2,200
Mar 2024$68.01$69.15$68.01$69.12+1.63%1,300
Feb 2024$69.50$69.50$67.55$68.01-2.14%2,500
Jan 2024$69.25$69.50$69.25$69.50+0.36%100
Dec 2023$65.50$69.25$65.50$69.25+5.73%2,900
Nov 2023$65.00$67.50$64.65$65.50+0.77%2,400
Oct 2023$69.00$70.00$65.00$65.00-14.47%1,600
Sep 2023$76.00$76.00$76.00$76.000.00%0
Aug 2023$80.00$80.00$76.00$76.00-5.00%300
Jul 2023$80.00$80.00$80.00$80.000.00%0
Jun 2023$80.00$80.00$80.00$80.000.00%0
May 2023$81.00$81.00$80.00$80.00-1.23%100
Apr 2023$82.25$82.25$80.00$81.00-1.52%1,000
Mar 2023$79.00$82.25$78.00$82.25-0.30%700
Feb 2023$82.50$82.50$82.50$82.500.00%0
Jan 2023$75.00$82.50$75.00$82.50+10.00%400
Dec 2022$75.00$75.00$75.00$75.000.00%0
Nov 2022$86.50$86.50$75.00$75.00-13.29%300
Oct 2022$87.00$87.00$86.50$86.50-0.57%100
Sep 2022$89.00$89.00$86.00$87.00-2.25%300
Aug 2022$89.00$89.00$89.00$89.000.00%0
Jul 2022$91.00$91.00$88.00$89.00-2.20%200
Jun 2022$91.00$91.00$91.00$91.000.00%0
May 2022$92.00$92.00$91.00$91.00-1.09%100
Apr 2022$95.00$95.00$92.00$92.00-3.16%100
Mar 2022$95.00$95.00$95.00$95.000.00%0
Feb 2022$97.01$97.01$95.00$95.00-2.07%500
Jan 2022$98.01$98.01$97.01$97.01-1.02%100
Dec 2021$98.01$98.01$98.01$98.010.00%0
Nov 2021$98.01$98.01$98.01$98.010.00%0

Seasonality

AILLO return in each calendar month over the last 10 years, including dividends. The current month runs to the latest close.

YearJanFebMarAprMayJunJulAugSepOctNovDec
Average2.1%-1.3%-0.0%0.2%0.1%0.1%1.7%-1.1%0.8%-0.9%-0.6%0.4%
Months up7 of 102 of 101 of 105 of 105 of 102 of 109 of 101 of 103 of 106 of 104 of 92 of 9
20260.3%2.2%-0.9%0.8%-0.9%0.0%1.4%-1.1%-1.4%-0.4%
20252.6%0.4%0.0%-0.9%-2.3%1.6%1.7%-0.4%3.0%3.4%-1.4%-0.7%
20241.9%-2.1%1.6%-1.2%1.1%-1.3%7.3%-2.3%6.4%-1.7%-4.0%0.6%
202311.6%0.0%-0.3%-0.2%-1.2%0.0%1.3%-5.0%0.0%-13.1%0.8%5.7%
2022-1.0%-2.1%0.0%-2.1%-1.1%0.0%-1.0%0.0%-2.2%0.7%-13.3%0.0%
20210.0%0.0%-0.8%1.1%-0.5%0.0%1.1%1.3%-1.8%1.1%0.0%0.0%
20201.1%-2.5%0.0%1.1%1.9%0.0%1.1%0.0%0.0%1.6%1.9%-1.9%
20191.1%-8.9%0.0%5.6%1.1%0.0%1.1%0.0%4.2%1.1%0.0%0.0%
20184.2%0.0%0.0%-3.9%2.1%0.8%1.1%-3.3%0.0%1.7%5.3%0.0%
2017-0.3%0.0%0.0%2.1%1.1%-0.3%1.7%0.0%0.0%-3.1%5.1%0.0%