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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 week, 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
Week ofOpenHighLowCloseChangeVolume
Oct 19, 2026$65.25$65.25$65.25$65.250.00%0
Oct 12, 2026$65.25$65.25$65.25$65.25-1.95%100
Oct 5, 2026$66.55$67.50$66.55$66.550.00%505
Sep 28, 2026$67.35$67.35$66.55$66.55-1.19%916
Sep 21, 2026$67.35$67.35$67.35$67.350.00%0
Sep 14, 2026$67.35$67.35$67.35$67.350.00%0
Sep 8, 2026$67.35$67.35$67.35$67.350.00%175
Aug 31, 2026$67.50$67.50$67.35$67.35-0.22%200
Aug 24, 2026$67.50$67.50$67.50$67.500.00%0
Aug 17, 2026$67.50$67.50$67.50$67.500.00%0
Aug 10, 2026$67.50$67.50$67.50$67.500.00%0
Aug 3, 2026$68.25$68.25$67.50$67.50-1.10%107
Jul 27, 2026$68.25$68.25$68.25$68.250.00%0
Jul 20, 2026$68.00$68.25$68.00$68.25+0.37%261
Jul 13, 2026$68.40$68.40$68.00$68.00-0.58%100
Jul 6, 2026$68.40$68.40$68.40$68.400.00%0
Jun 29, 2026$68.40$68.40$68.40$68.400.00%0
Jun 22, 2026$68.40$68.40$68.40$68.400.00%0
Jun 15, 2026$68.40$68.40$68.40$68.400.00%0
Jun 8, 2026$68.40$68.40$68.40$68.400.00%0
Jun 1, 2026$68.40$68.40$68.40$68.400.00%0
May 26, 2026$68.48$68.48$68.39$68.40-0.12%718
May 18, 2026$69.50$69.50$68.48$68.48-1.47%119
May 11, 2026$69.50$69.50$69.50$69.500.00%0
May 4, 2026$69.00$69.50$69.00$69.50+0.72%100
Apr 27, 2026$68.44$69.00$68.44$69.00+0.82%103
Apr 20, 2026$68.45$68.55$68.44$68.44-0.01%457
Apr 13, 2026$69.50$69.50$68.45$68.45-1.51%200
Apr 6, 2026$69.50$69.50$69.50$69.500.00%0
Mar 30, 2026$69.50$69.50$69.50$69.50-0.64%650
Mar 23, 2026$70.25$70.27$69.95$69.95-0.43%980
Mar 16, 2026$70.00$70.25$70.00$70.25+0.36%197
Mar 9, 2026$71.00$71.00$70.00$70.00-1.41%299
Mar 2, 2026$70.11$71.00$70.11$71.00+1.27%196
Feb 23, 2026$70.00$70.11$70.00$70.11+0.16%430
Feb 17, 2026$70.50$70.50$70.00$70.00-0.71%175
Feb 9, 2026$68.61$70.50$68.61$70.50+2.75%544
Feb 2, 2026$68.61$68.61$68.61$68.610.00%0
Jan 26, 2026$70.00$70.00$68.61$68.61-1.99%142
Jan 20, 2026$70.00$70.00$70.00$70.000.00%0
Jan 12, 2026$69.50$70.04$69.50$70.00+0.72%701
Jan 5, 2026$69.50$69.50$69.50$69.500.00%200
Dec 29, 2025$69.50$69.50$69.50$69.500.00%0
Dec 22, 2025$71.00$71.00$69.50$69.50-2.11%250
Dec 15, 2025$71.00$71.00$71.00$71.000.00%0
Dec 8, 2025$70.75$71.00$69.80$71.00+0.35%200
Dec 1, 2025$70.00$71.50$69.80$70.75+1.07%800
Nov 24, 2025$69.50$70.00$69.50$70.00+0.72%950
Nov 17, 2025$70.99$72.00$69.49$69.50-2.10%700
Nov 10, 2025$70.99$70.99$70.99$70.990.00%0
Nov 3, 2025$70.99$70.99$70.99$70.990.00%0
Oct 27, 2025$69.30$70.99$69.30$70.99+2.44%100

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%